Author Topic: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer  (Read 26110 times)

edovis and 1 Guest are viewing this topic.

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Siglent is launching new equipment



EMC Live 2018
Wednesday, April 25, 2018
Product Demo – 1:05 – 1:20 pm ET


"The new SIGLENT SVA1015X helps minimize test time by combining a swept superheterodyne spectrum analyzer with a two port VNA. The available Distance to Fault, EMI, and complex impedance measurement options..."

"...improved UI with new touch screen, mouse, and keyboard support."

« Last Edit: June 30, 2018, 04:12:51 am by rf-loop »
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #1 on: March 09, 2018, 08:36:28 pm »
Estimated release May 2018
Estimated price around 1500$
Spectrum 9kHz - 1.5GHz and with TG
DANL -160dBm/Hz
Standard including preamplifier
Vector Network Analyzer
Cable Test
Antenna Test
Display 10.1"  1024x600  capacitive touch panel.
Support also ext Keyboard and Mouse
And more.... soon.
« Last Edit: March 27, 2018, 04:12:44 pm by rf-loop »
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #2 on: March 09, 2018, 08:37:36 pm »
reserved
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline Dubbie

  • Supporter
  • ****
  • Posts: 902
Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #3 on: March 09, 2018, 08:50:04 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #4 on: March 09, 2018, 11:20:35 pm »
3 and 6Ghz are probably not in the price segment they’re aiming this thing at. And there are tons of antennas in subgiga to use this one for I guess.

Why that picture is blurred except for the brand name though heh....not like you can see the specs by just looking at it. (Seems the picture was posted on Twitter, withou blurr)
« Last Edit: March 09, 2018, 11:25:00 pm by Neganur »
 

Offline borjam

  • Supporter
  • ****
  • Posts: 654
  • Country: es
  • EA2EKH
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #5 on: March 09, 2018, 11:24:54 pm »
Now this is interesting!

I was wondering how long it would take.

As a miniVNA Tiny user I am really curious. I know it has lots of limitations, but the price is unbeatable so far.

Although I imagine the price of this thing will be in the €/$1000 - €/$2000...
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #6 on: March 09, 2018, 11:46:56 pm »
(Seems the picture was posted on Twitter, withou blurr)

There:



« Last Edit: March 09, 2018, 11:49:00 pm by PA0PBZ »
Keyboard error: Press F1 to continue.
 
The following users thanked this post: tautech

Offline sequoia

  • Supporter
  • ****
  • Posts: 63
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #7 on: March 10, 2018, 05:44:12 am »
I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....

 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #8 on: March 10, 2018, 05:47:09 am »
HEY those images are from our twitter account! Where is the credit!
I took them at Embedded World 2018 in Nuremberg (DE)
https://twitter.com/BatterFlySrl/status/969967096951132160
https://twitter.com/BatterFlySrl/status/968819477646381057
Technical Support
 

Offline MadTux

  • Frequent Contributor
  • **
  • Posts: 479
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #9 on: March 10, 2018, 06:01:13 am »
Well, price-wise, these are cerainly not for me, but maybe HP-8753s are getting cheaper, then  :-DD >:D
 

Offline borjam

  • Supporter
  • ****
  • Posts: 654
  • Country: es
  • EA2EKH
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #10 on: March 10, 2018, 06:33:37 am »
I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....
For the typical antenna adjustments the cheap VNAs are enough. I have a miniVNA Tiny and it works really well. If you are doing finer stuff like filters it’s a different matter of course.

What will be its dynamic range?

 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #11 on: March 10, 2018, 06:57:30 am »
I would say similar to SSA3000X
btw the SVA has a 10.1" touch screen display
Technical Support
 

Offline PA4TIM

  • Super Contributor
  • ***
  • Posts: 1116
  • Country: nl
  • instruments are like rabbits, they multiply fast
    • PA4TIMs shelter for orphan measurement stuff
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #12 on: March 10, 2018, 07:16:32 am »
Wow, it looks very modern for a thing made in 1970 , or is it a bug in the firmware  >:D
www.pa4tim.nl my collection measurement gear and experiments Also lots of info about network analyse
www.schneiderelectronicsrepair.nl  repair of test and calibration equipment
https://www.youtube.com/user/pa4tim my youtube channel
 
The following users thanked this post: kj7e

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #13 on: March 10, 2018, 08:57:32 am »
Wow, it looks very modern for a thing made in 1970 , or is it a bug in the firmware  >:D

1.1.1970 is UNIX "epoch time" - (and its little cousin linusnix).
We also remember this old method for modify SSA3000X using this "epoch time" trick.
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #14 on: March 10, 2018, 10:53:56 am »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #15 on: March 10, 2018, 10:58:13 am »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Ouch, hopefully the labeling is just incorrect, otherwise it is awful lame and better be crazy cheap. Pretty hard to call it a two port analyzer.
« Last Edit: March 10, 2018, 11:00:09 am by TheSteve »
VE7FM
 

Offline Bud

  • Super Contributor
  • ***
  • Posts: 3151
  • Country: ca
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #16 on: March 10, 2018, 11:01:28 am »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Apparently the Chinese know a way to do it without one.  But my bet is they have no idea how to do it at all.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #17 on: March 10, 2018, 11:15:34 am »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Apparently the Chinese know a way to do it without one.  But my bet is they have no idea how to do it at all.
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Ouch, hopefully the labeling is just incorrect, otherwise it is awful lame and better be crazy cheap. Pretty hard to call it a two port analyzer.

Actually it isn't really a bad decision for a combo device, as you can buy what you need. Also they already have a coupler for the SA range.

But _if_ it is the case there will be quite a bit of port swapping needed.
 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #18 on: March 10, 2018, 12:11:30 pm »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Apparently the Chinese know a way to do it without one.  But my bet is they have no idea how to do it at all.


You don't need a system that uses an external coupler to measure S11.  The DG8SAQ VNWA is a two port vector network analyzer that will measure S11 up to 1.3GHz and it uses a resistive bridge internally.

The difficult part is the phase of S11 (or indeed of any S-parameter they are measuring) - how do they compare the phase of the reflected signal with that of their source signal?
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #19 on: March 10, 2018, 12:30:12 pm »
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

Apparently the Chinese know a way to do it without one.  But my bet is they have no idea how to do it at all.


You don't need a system that uses an external coupler to measure S11.  The DG8SAQ VNWA is a two port vector network analyzer that will measure S11 up to 1.3GHz and it uses a resistive bridge internally.

The difficult part is the phase of S11 (or indeed of any S-parameter they are measuring) - how do they compare the phase of the reflected signal with that of their source signal?

Yes, I meant coupler or bridge.

It can also be done with a circulator or even a splitter. Circulators are normally not wide band, but  there is a older solid state design that Charles Wenzel has published for low frequencies and low power. It would be interesting to see how high in frequency that could operate using the fastest op-amps available now.

The phase comparison part is not difficult. Internally there would be a second, reference, detector which is fed with a portion of the TG signal. The detectors are just mixers and ADC's. The some maths in the FPGA and bobs your uncle.

 

Offline KE5FX

  • Super Contributor
  • ***
  • Posts: 1025
  • Country: us
    • KE5FX.COM
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #20 on: March 10, 2018, 01:01:15 pm »
It probably has only two receiver channels internally instead of three or four.  They may have a single directional coupler (more likely a resistive bridge) on the main port to support S11 measurements, and a conventional non-directional ALC sampler on the TG port.  S21 measurements would be scalar only, implemented by treating the tracking generator output as a transmit-only "port 2." 

Not necessarily a bad way to go, at the right price.  But it limits your calibration options.  It had better be cheap... very cheap.
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #21 on: March 11, 2018, 02:44:45 am »
You don't need 4 or two receivers to measure S21 - one is enough, and also phase can easily be measured with just one receiver if you compare the received phase to the phase at the TG output.

Implement a switching matrix (e.g. four RF SPDT switches) to change the DUT direction and then just have another switch path to select for reflection and transmission + the math.

Very crude compared to modern stuff but sure it works.

 
The following users thanked this post: hendorog

Online nctnico

  • Super Contributor
  • ***
  • Posts: 16716
  • Country: nl
    • NCT Developments
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #22 on: March 11, 2018, 02:58:04 am »
You don't need 4 or two receivers to measure S21 - one is enough, and also phase can easily be measured with just one receiver if you compare the received phase to the phase at the TG output.
That is assuming the DUT doesn't affect the phase and amplitude of the TG. AFAIK most DUTs will affect the amplitude and phase of the TG so you'll need to measure the TG output while it is loaded by the DUT.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #23 on: March 11, 2018, 03:21:53 am »
Could you elaborate how you think the phase is being affected and how is this relevant if you are comparing the phase at the input to the output?

It’s a relative measurement after all.
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #24 on: March 11, 2018, 03:50:13 am »
I have few more images about it which show the different mode. The unit was not connected to a signal or component. Would you like me to post them?
Technical Support
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #25 on: March 11, 2018, 06:00:55 am »
I have few more images about it which show the different mode. The unit was not connected to a signal or component. Would you like me to post them?

Definitely  :-+
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #26 on: March 11, 2018, 07:35:16 am »
I have few more images about it which show the different mode. The unit was not connected to a signal or component. Would you like me to post them?
Well errrr, like does a bear shite in the woods ? YES !
Avid Rabid Hobbyist
 

Offline KE5FX

  • Super Contributor
  • ***
  • Posts: 1025
  • Country: us
    • KE5FX.COM
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #27 on: March 11, 2018, 11:40:10 am »
Could you elaborate how you think the phase is being affected and how is this relevant if you are comparing the phase at the input to the output?

It’s a relative measurement after all.

It's a cute idea, but you're not really making a relative measurement if you can't monitor both channels simultaneously.  Apart from phase noise and drift over time, toggling the T/R switch will inevitably cause slight changes in loading at both the DUT and coupler outputs that will prevent you from being able to calibrate the measurement properly. 

To get it working at all, my guess is that you will literally have to spend more money on isolation amps than another receiver would have cost. 

It's interesting, though, in the sense that really good DC-microwave switches are becoming readily available.  You could make some people at Peregrine Semiconductor very happy with this topology.
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #28 on: March 11, 2018, 01:21:16 pm »
I'm not sure why you are being so dismissive. This topology definitely works. You just need to save several sets of cal data.
Like I said, compared to 4 receiver toplogy it's crude. But yes it works and was merely to illustrate how this could be implemented in for example the Siglent.
Especially if they already have the spectrum analyzer part and a tracking generator, then it just needs a few components more to make it a VNA.

Can it be compared to a PNA from Keysight, certainly not :)

Phase noise on the Rigol DSA815 isn't spectacular either. And how much does an ERA-33SM cost nowadays as isolation amp, $1.77 a piece?
 

Offline KE5FX

  • Super Contributor
  • ***
  • Posts: 1025
  • Country: us
    • KE5FX.COM
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #29 on: March 11, 2018, 02:07:42 pm »
I'm not sure why you are being so dismissive. This topology definitely works.

Definitely not being dismissive, although I would've been before the PE42020 came out.  What you posted could very well be what they're doing. 

But through personal experience I've learned that there are very few free lunches in a VNA block diagram.  Spectrum analyzers are downright trivial by comparison. 

As you get up into the GHz range, isolation in particular is hard
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #30 on: March 12, 2018, 09:15:03 pm »
Sorry for my delay on posting the other images, Yesterday the forum was down and I didn't want to make mistakes.
As said, don't look at the signal since there was nothing connected to the unit.
Technical Support
 

Offline Gandalf_Sr

  • Frequent Contributor
  • **
  • Posts: 654
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #31 on: March 12, 2018, 10:11:29 pm »
Do you get wafers with it? (credit to )
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #32 on: March 15, 2018, 04:05:35 am »
Probably the unit has an internal VSWR bridge which can perform one-port vector reflection measurements.
Technical Support
 

Offline DC1MC

  • Frequent Contributor
  • **
  • Posts: 963
  • Country: de
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #33 on: March 15, 2018, 04:23:35 am »
Mail from Siglent:
Quote
Dear DC1MC,

Hope this email find you well!
This is Jie from Siglent, EU Sales.

Thanks for your visiting of our Siglent booth 4-306 at embedded world 2018 exhibition.
Glad to know that you are interested in our spectrum analyzer products.
Siglent products have the high quality test equipment with an excellent price/performance ratio.

For the details of our products, you can directly to visit our websites:
SSA3000X:
http://siglenteu.com/pdxx.aspx?id=1252&T=2&tid=18

The new spectrum analyzer with vector network analyzing function is not available now.
If you have any concerns, please feel free to contact with me.

Best Regards,
Jie
EU Sales

So yeah, not like it will be soon available :(

 DC1MC
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #34 on: March 15, 2018, 04:29:30 am »
I guess before summer holiday
Technical Support
 

Online nctnico

  • Super Contributor
  • ***
  • Posts: 16716
  • Country: nl
    • NCT Developments
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #35 on: March 15, 2018, 07:13:48 am »
I'm not sure why you are being so dismissive. This topology definitely works.

Definitely not being dismissive, although I would've been before the PE42020 came out.  What you posted could very well be what they're doing. 

But through personal experience I've learned that there are very few free lunches in a VNA block diagram.  Spectrum analyzers are downright trivial by comparison. 

As you get up into the GHz range, isolation in particular is hard.
AFAIK what makes things extra difficult is the fact that a 50 Ohm directional coupler works well for looking at a '50 Ohm system' but if you are looking at a system with an impedance of 1k Ohm or 1 milli-Ohm then the VSWR will be very far off anyway and thus measurement accuracy and resolution are going to suffer. I have a low frequency VNA (10Hz to 300MHz) and that offers various ways of doing measurements. I think this Siglent VNA will be handy for measuring antenna's and other typical circuits in the 50 Ohm or 75 Ohm realm but it may be less usefull for measuring milli-ohm impedances in circuit board power distribution.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #36 on: March 15, 2018, 07:20:15 am »
I'm not sure why you are being so dismissive. This topology definitely works.

Definitely not being dismissive, although I would've been before the PE42020 came out.  What you posted could very well be what they're doing. 

But through personal experience I've learned that there are very few free lunches in a VNA block diagram.  Spectrum analyzers are downright trivial by comparison. 

As you get up into the GHz range, isolation in particular is hard.
AFAIK what makes things extra difficult is the fact that a 50 Ohm directional coupler works well for looking at a '50 Ohm system' but if you are looking at a system with an impedance of 1k Ohm or 1 milli-Ohm then the VSWR will be very far off anyway and thus measurement accuracy and resolution are going to suffer. I have a low frequency VNA (10Hz to 300MHz) and that offers various ways of doing measurements. I think this Siglent VNA will be handy for measuring antenna's and other typical circuits in the 50 Ohm or 75 Ohm realm but it may be less usefull for measuring milli-ohm impedances in circuit board power distribution.
As we can't yet get even a Chinese datasheet for these who's to say what impedance corrections will be offered within the UI, lots more info is needed before we can say; it can't do this or it can do that.
Avid Rabid Hobbyist
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #37 on: March 15, 2018, 07:43:44 am »
Mark my words Siglent is not the only one coming with this solution. Wait end of this month and see what happen!!!! Of course I know it all already :)
Technical Support
 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #38 on: March 15, 2018, 08:07:29 am »
AFAIK what makes things extra difficult is the fact that a 50 Ohm directional coupler works well for looking at a '50 Ohm system' but if you are looking at a system with an impedance of 1k Ohm or 1 milli-Ohm then the VSWR will be very far off anyway and thus measurement accuracy and resolution are going to suffer. I have a low frequency VNA (10Hz to 300MHz) and that offers various ways of doing measurements. I think this Siglent VNA will be handy for measuring antenna's and other typical circuits in the 50 Ohm or 75 Ohm realm but it may be less usefull for measuring milli-ohm impedances in circuit board power distribution.


Well, that's true of most VNAs, unless you have an RF I-V interface.  Even so, you're not going to be measuring milli-ohm impedances with a VNA.  The chart on page 58 of the following gives an overview of the frequency/impedance capabilities of various measuring methods:

https://www.keysight.com/upload/cmc_upload/All/ChallengesandsolutionsforImpedance.pdf

 

Offline G0HZU

  • Super Contributor
  • ***
  • Posts: 2576
  • Country: gb
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #39 on: March 15, 2018, 09:28:50 am »
'combo' analysers like this (based on a spectrum analyser) date back at least 35 years. The design of my old Takeda Riken (Advantest) spectrum analyser dates back to about 1981 and it has an internal tracking generator and came with the factory 'impedance' option fitted. This required an external Anritsu RLB as part of the option but it was capable of reasonable performance when measuring impedance. So it could mimic a basic VNA and it was also a very good spectrum analyser. In all the time we had it at work I don't think anybody used it as a VNA to measure impedance (because we had better alternatives) but it was used a lot as a spectrum analyser for critical testing up to 1800MHz.
 

Offline Performa01

  • Frequent Contributor
  • **
  • Posts: 710
  • Country: at
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #40 on: March 27, 2018, 02:48:00 am »
Of course I am also interested in this instrument, so I’ve investigated a bit. Looks like this is a whole new design, but it will certainly take advantage of the experience gained with the SSA series. The base version is most likely to come as a spectrum analyzer with tracking generator as standard, hence can be used as a SNA (Scalar Network Analyzer) for gain measurements right out of the box.

More advanced measurements like VNA (Vector Network Analysis), DTF (Distance To Fault) and DMA (Digital Modulation Analysis) will be just software licenses, no additional hardware required.
There will also be the Advanced Measurements and EMI Pre-Compliance Test options just like with the SSA3kX.

 
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Not for now.


I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....

We don’t know the price yet, so why starting to complain already?

There are still lots of folks buying the Rigol DSA815-TG, aren’t there? The new Siglent SVA1015X will cover the same frequency range, but with supposedly better specs, e.g. lower resolution bandwidth and lower phase noise. I don’t think the fact that this machine can be easily upgraded to a VNA, Fault locator and Digital Modulation Analyzer makes it less attractive for potential users.


Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

So the explicit answer is no – and maybe that’s also one reason why the frequency range is limited to 1.5GHz. It’s pure speculation on my side, but I recon it would be difficult to cover an even wider frequency range with just one coupler or even bridge and for now Siglent sure didn’t want to have to switch between several of them – not to mention the increase in cost.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #41 on: March 27, 2018, 04:15:35 am »

Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?

So the explicit answer is no – and maybe that’s also one reason why the frequency range is limited to 1.5GHz. It’s pure speculation on my side, but I recon it would be difficult to cover an even wider frequency range with just one coupler or even bridge and for now Siglent sure didn’t want to have to switch between several of them – not to mention the increase in cost.

Yes it looks like it is built in. However building wideband bridge/couplers isn't the issue - if it was then having external couplers would be a logical solution :D
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #42 on: March 27, 2018, 04:05:21 pm »


I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....

We don’t know the price yet, so why starting to complain already?

There are still lots of folks buying the Rigol DSA815-TG, aren’t there? The new Siglent SVA1015X will cover the same frequency range, but with supposedly better specs, e.g. lower resolution bandwidth and lower phase noise. I don’t think the fact that this machine can be easily upgraded to a VNA, Fault locator and Digital Modulation Analyzer makes it less attractive for potential users.


Price will be around 1.5k$  what makes it quite interesting (of course including TG).

Spectrum 9kHz-1.5GHz, DANL -160dBm/Hz.

Vector Network Analyzer, Cable and Antenna Test. Overall functionally very similar with R&S new SA+VNA.
Display 10.1" 1024x600 with capacitive touch.  Keyboard and mouse supported.
Estimated release: May
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 
The following users thanked this post: Neganur, hendorog

Offline Performa01

  • Frequent Contributor
  • **
  • Posts: 710
  • Country: at
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #43 on: March 27, 2018, 09:45:52 pm »
Price will be around 1.5k$  what makes it quite interesting (of course including TG).

...and including preamplifier. Thank you for the information – I have not been able to confirm the envisaged price yet.


Those interested in some more preliminary technical details might want to have a look at the screenshots below (many thanks to Siglent for providing them and answering my questions)

SVA1015X Displayed Average Noise Level almost -158dBm/Hz @ 99MHz


SVA1015X DANL -150dBm RBW10Hz


SVA1015X Minimum Resolution Bandwidth 1Hz


SVA1015X Minimum 1Hz RBW


SVA1015X SSB Phase Noise -100dBm/Hz @ 10kHz distance from carrier @ 1GHz


SVA1015X Phase Noise -100dBc@10kHz


SVA1015X Digital Modulation Analysis Eye Diagram


SVA1015X DMA Eye Diagram


SVA1015X Distance To Fault


SVA1015X DTF Fault Locator


SVA1015X Vector Network Analyzer Smith Chart


SVA1015X VNA Smith Chart

« Last Edit: April 24, 2018, 11:36:18 pm by Performa01 »
 
The following users thanked this post: thm_w, tautech, Dubbie

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Technical Support
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #45 on: March 29, 2018, 07:06:20 pm »
So from the info I see on the Chinese website it appears it will be priced the same as SSA3021X.
Avid Rabid Hobbyist
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #46 on: March 29, 2018, 08:31:47 pm »
I'm pretty sure the price will be a key point! here is the Siglent first video (by Siglent)

Technical Support
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #47 on: March 29, 2018, 08:50:12 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
Not apparently only the 1.5GHz version for western markets and a 1GHz version for Asian markets.
Avid Rabid Hobbyist
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #48 on: March 30, 2018, 10:03:56 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Rohde&Schwarz do not think so.
Just ago launched new FPC1500  Spectrum  & VNA base model is 1GHz.
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #49 on: March 30, 2018, 10:07:02 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Rohde&Schwarz do not think so.
Just ago launched new FPC1500  Spectrum  & VNA base model is 1GHz.
The FPC1500 can be upgraded up to 3GHz VNA included
Technical Support
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #50 on: March 30, 2018, 10:48:22 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Rohde&Schwarz do not think so.
Just ago launched new FPC1500  Spectrum  & VNA base model is 1GHz.
The FPC1500 can be upgraded up to 3GHz VNA included

Yes of course. As I told BASE model is 1GHz. You buy it and then you buy things what you need. More os less handfull of options. Even VNA is option what need pay separately.

But still base model is 1GHz and my message only purpose was just answer for quy who wonder this Siglent "low" 1.5GHz limit. What is still more than R&S  base  model of FPC1500.
Not for start debate about R&S features and option. Only for show that even 1GHz comprabale equipment is lauched by A+ grade manufacturer just ago. No one is there to ask if it's a bit low just in the current years. As we can see name is important.

;)  !
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #51 on: March 30, 2018, 11:20:09 pm »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Rohde&Schwarz do not think so.
Just ago launched new FPC1500  Spectrum  & VNA base model is 1GHz.
The FPC1500 can be upgraded up to 3GHz VNA included

Yes of course. As I told BASE model is 1GHz. You buy it and then you buy things what you need. More os less handfull of options. Even VNA is option what need pay separately.

But still base model is 1GHz and my message only purpose was just answer for quy who wonder this Siglent "low" 1.5GHz limit. What is still more than R&S  base  model of FPC1500.
Not for start debate about R&S features and option. Only for show that even 1GHz comprabale equipment is lauched by A+ grade manufacturer just ago. No one is there to ask if it's a bit low just in the current years. As we can see name is important.

;)  !
not looking for debate either :)
for me the main point is not the bandwidth but the single port instead.
we will learn more in the short future.
 :-+
Technical Support
 

Offline 1design

  • Regular Contributor
  • *
  • Posts: 120
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #52 on: March 31, 2018, 12:41:49 am »
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?

Rohde&Schwarz do not think so.
Just ago launched new FPC1500  Spectrum  & VNA base model is 1GHz.

The did, as their base/educational model, their mainstream gear is very...very..different in regards to both SA and VNA performance/freq. range and of course, target market.
 

Offline MAV3NX

  • Newbie
  • Posts: 2
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #53 on: June 05, 2018, 09:50:13 pm »
As far as I know, Transcat does most of the Siglent Calibrations in the US and unfortunately I don't think the CALIBRATION CERT's come cheap.
 

Offline MAV3NX

  • Newbie
  • Posts: 2
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #54 on: June 05, 2018, 09:55:48 pm »
Siglent is going to be at the IMS2018 conference next week in Philadelphia with the SVA1015X.  After speaking with one of the rep's yesterday, I believe that it will also have mod/demod software options too.  I just hope it has QAM-256 to QAM1024 modulation upgrades with MER, preBER and postBER capabilities.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #55 on: June 05, 2018, 10:08:53 pm »
I went fishing for a release date today only to be told the same as last week: June.
Avid Rabid Hobbyist
 

Offline tinhead

  • Super Contributor
  • ***
  • Posts: 1858
  • Country: 00
    • If you like my hacks, send me a donation
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #56 on: June 10, 2018, 05:35:25 am »
Estimated price around 1500$


hmm i have to preorder one, if the price is real. From what i see, SSA1015X is at 9980 RMB (1400EUR) and SVA1015X at 36780 RMB (4800EUR) -> http://www.siglent.com/spectrum_analyzer/SVA1000X
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #57 on: June 10, 2018, 06:13:29 am »
Estimated price around 1500$


hmm i have to preorder one, if the price is real. From what i see, SSA1015X is at 9980 RMB (1400EUR) and SVA1015X at 36780 RMB (4800EUR) -> http://www.siglent.com/spectrum_analyzer/SVA1000X
Correct.
China price for SSA3021X is the same.  ;)
Avid Rabid Hobbyist
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #58 on: June 15, 2018, 01:50:02 pm »
 
The following users thanked this post: thm_w

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #59 on: June 15, 2018, 02:29:20 pm »
Beaut, here we go :)
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #60 on: June 22, 2018, 06:33:22 pm »
Estimated price around 1500$


hmm i have to preorder one, if the price is real. From what i see, SSA1015X is at 9980 RMB (1400EUR) and SVA1015X at 36780 RMB (4800EUR) -> http://www.siglent.com/spectrum_analyzer/SVA1000X
Correct.
China price for SSA3021X is the same.  ;)
Actually a bit better than SSA3021X........SVA1015X US$ 1395 c/w TG plus other options.

Option list
EMI measurement kit
Advanced measurement kit ,including ACPR, CHPower, OBW and so on.
Vector Network Analysis
Distance To Fault
Digital Modulation Analysis Function,including ASK, FSK
Analog Modulation Analysis Function,including AM,FM

Official release, next week.


Avid Rabid Hobbyist
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #61 on: June 22, 2018, 08:52:22 pm »
Public launch is June the 28th
We already have units.
Technical Support
 


Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #63 on: June 27, 2018, 11:59:49 pm »
Hello, we got units on stock, discount available for EEVblog community, PM me, here is the EURO price list:
SVA1015X EURO 1215 + VAT
SVA1000X-EMI EURO 389 + VAT
SVA1000X-AMK EURO 364 + VAT
SVA1000X-VNA EURO 529 + VAT
SVA1000X-DTF EURO 249 + VAT
SVA1000X-DMA EURO 319 + VAT
SVA1000X-AMA EURO 286 + VAT

 :-+
Technical Support
 

Offline Bicurico

  • Frequent Contributor
  • **
  • Posts: 798
  • Country: pt
    • VMA's Satellite Blog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #64 on: June 28, 2018, 03:08:48 am »
I would be interested to know how much the SVA1000X differs from the SSA3000X *HARDWARE WISE*.

Is it really a new hardware or could everything VNA related (in theory) been implemented by software?

Regards,
Vitor
 
The following users thanked this post: bozidarms

Offline BillB

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #65 on: June 28, 2018, 08:12:35 am »
An informal poll:

If you are an SSA3000X owner, would you rather have purchased this if it were also available at the time of your purchase?

 
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #66 on: June 28, 2018, 09:24:00 am »
I would be interested to know how much the SVA1000X differs from the SSA3000X *HARDWARE WISE*.

Is it really a new hardware or could everything VNA related (in theory) been implemented by software?

Regards,
Vitor

This a all off the cuff, but it might be theoretically possible to use the SSA hardware (with caveats) - as only one of the LO's is actually sweeping, and that same LO is downconverted and used to generate the TG output. I don't think the hardware is the same though.

Therefore the phase relationship - after power up - between all of the PLL's - might not change between the TG output and the SA input as it sweeps (assuming nothing is altered). Since the LO1 which is sweeping the TG is also used to downconvert the input, the phase of that doesn't need to be consistent.

To do an OSL VNA measurement you at a minimum need to be able to do four sweeps where the phase doesn't change. One for the open, one for the short, one for the load, and one for the measurement. The problem arises if you reset or preset the SSA, then all of the PLL's will come back up at different phases and so your calibration needs to be done again.

The other caveat is that there is only one input, so there can be no reference measurement. This means that any drift will directly impact the measurement.
Real VNA's have at least two receivers - one is used as a reference - and the DUT measurement is compared against the reference measurement.

As a point of comparison the Signalhound products cannot maintain the phase relationship between the SA and the TG as they sweep - because they are physically  different devices and only share a 10MHz reference, but don't share the same LO. They can make VNA type measurements at a single frequency (i.e. no sweeping) but the system only has only one receiver and so they have the drift problem above.

This could all be worked around somewhat using a solid state switch to provide a reference input and a DUT input and switch between them as needed to measure and correct for the phase issue on each frequency change, and it would also allow a correction for most of the drift issue. However the isolation of the switch would be an issue that would affect the measurement at some point and would need to be corrected for.

 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Avid Rabid Hobbyist
 

Offline Dubbie

  • Supporter
  • ****
  • Posts: 902
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #68 on: June 28, 2018, 03:26:06 pm »
An informal poll:

If you are an SSA3000X owner, would you rather have purchased this if it were also available at the time of your purchase?

 

Possibly, although I would miss the up to 3Ghz range.
 

Offline bson

  • Supporter
  • ****
  • Posts: 1495
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #69 on: June 28, 2018, 06:41:12 pm »
It should be possible to divide down the source output and feed it into a phase detector. As long as the frequency and phase are known the REF receiver shouldn't be necessary for basic 2-port measurements since the REF can be constructed from the DDS parameters, time, VCO phase detection, and cal data.  But, the devil is in the details and we ARE talking "measurement grade" quantitative correctness here, not a curve that "mostly looks awrite"...
 

Offline srce

  • Regular Contributor
  • *
  • Posts: 94
  • Country: gb
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #70 on: June 28, 2018, 06:53:27 pm »
An informal poll:

If you are an SSA3000X owner, would you rather have purchased this if it were also available at the time of your purchase?

 

Possibly, although I would miss the up to 3Ghz range.
Yep - would upgrade if they had a 3GHz version. Hopefully that will follow.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #71 on: June 28, 2018, 07:05:55 pm »
An informal poll:

If you are an SSA3000X owner, would you rather have purchased this if it were also available at the time of your purchase?

 

Possibly, although I would miss the up to 3Ghz range.
Yep - would upgrade if they had a 3GHz version. Hopefully that will follow.
SVA1015X is the top model in this series in which there is also a China market only model SSA1010X-C of 1 GHz capability.
I know of nothing else in development but it would seem to me the next step would be into higher frequency models based on the experience gained by the engineers in developing SSA and SVA models.
But I guess ATM they're busy with SDS5000X final development......
Avid Rabid Hobbyist
 

Offline Commander_Spock

  • Contributor
  • Posts: 15
  • Country: fr
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #72 on: June 29, 2018, 08:54:17 am »
Guess that as soon as siglent offer free vna (and others) options for free... Or if like the rigol 1054z these options can be easily enabled at home ... They will take all the hobbyist market, and sell a lot of these boxes... until  this happen sales will be slow as other competitors offer nice spectrum analyzers at about the same price
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #73 on: June 29, 2018, 09:46:20 am »
Guess that as soon as siglent offer free vna (and others) options for free...
I doubt very much they will !
TG is offered free as part of the package just like it is now for the SSA whereas it was once an option.
Avid Rabid Hobbyist
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #74 on: June 29, 2018, 10:13:01 am »
Does the VNA option include the calibration KIT?
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #75 on: June 29, 2018, 10:35:57 am »
Does the VNA option include the calibration KIT?
Apparently not. They're separate items in my price list.
Avid Rabid Hobbyist
 

Offline simone.pignatti

  • Frequent Contributor
  • **
  • Posts: 313
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #76 on: June 29, 2018, 03:54:32 pm »
Siglent offers a set as calibration kit, from the data sheet:
"The F503ME mechanical calibration kit contains precision 50 Ω, phase-matched, type-N standards, used to calibrate Siglent vector & spectrum analyzers. Standards include a fixed 50 Ω termination, an open load, a short load, and a through adaptor.
The F503ME performance specifications are very similar to the Keysight 85032B mechanical calibration kit and it can be used as a replacement of 85032B."
Technical Support
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #77 on: June 29, 2018, 04:00:18 pm »
Siglent offers a set as calibration kit, from the data sheet:
"The F503ME mechanical calibration kit contains precision 50 Ω, phase-matched, type-N standards, used to calibrate Siglent vector & spectrum analyzers. Standards include a fixed 50 Ω termination, an open load, a short load, and a through adaptor.
The F503ME performance specifications are very similar to the Keysight 85032B mechanical calibration kit and it can be used as a replacement of 85032B."

I think that it probably means:  "...can be used as a replacement of 85032B up to 1.5 GHz..."


 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #78 on: June 29, 2018, 04:00:25 pm »
The Keysight 85032B is rated to 6 GHz though, so how is a 3.5 GHz kit a replacement for it?
VE7FM
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #79 on: June 29, 2018, 04:06:52 pm »
Sorry if it is a dumb question... to analyze RF devices with non N connectors like SMA, is it required to have SMA calibration kit?  Is it possible to enter user defined / custom calibration kit parameters into the SVA1015X?
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #80 on: June 29, 2018, 05:48:05 pm »
Sorry if it is a dumb question... to analyze RF devices with non N connectors like SMA, is it required to have SMA calibration kit?  Is it possible to enter user defined / custom calibration kit parameters into the SVA1015X?
Seems so.
From the manual:
https://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2018/06/SVA1000X_UserManual_UM0701X_E01A.pdf

In SA mode:
2.6.4.6 Calibration
Set calibration related items. There are three calibration states, factory calibration, user
calibration, and no calibration. The user calibration status is displayed in green font at the top
left corner of the screen. Enter the sub-menu; you can make the appropriate choice.
1. Calibration
Calibrating with the specified mechanical calibration requires three loads: open, short, and
match. Calibration data is saved as user calibration data.
2. Ecal
Use the optional SIGLENT electronic calibration unit for calibration. Calibration data is saved
as user calibration data.
3. Cal kit
Specifies the calibration kit used for mechanical calibration.
4. Clear
Clear user calibration data.

In VNA mode:
2.6.5.5 Calibration
Set calibration related items. This function is only available when the measurement item is S11.
There are three calibration states, factory calibration, user calibration, and no calibration. The
user calibration status is displayed in green font at the top left corner of the screen. Enter the
sub-menu; you can make the appropriate choice.
1. 1-Port Cal
Calibrating with the specified mechanical calibration requires three loads: open, short, and
match. Calibration data is saved as user calibration data.
2. Response (Through)
When operating, connect the port 1 and port 2 of the analyzer with an optional Through
Adapter. The normalization operation moves the measurement reference plane to both ends of
the Through Adapter. This function is only available when the measurement item is S21. Enter
the normalized submenu to make the appropriate selection.
3. Ecal (not available)
Use the optional SIGLENT electronic calibration kit for calibration. Calibration data is saved as
user calibration data.
4. Clear
Clear user calibration data.
5. Cal kit
Specifies the calibration kit used for mechanical calibration.
 F503ME:Type-N 50Ω 3 GHz Cal Kit (Siglent)
 85032F:Type-N 50Ω 9 GHz Cal Kit (KeySight)
6. Modify Cal kit (not available)
Use user defined calibration kit

« Last Edit: June 29, 2018, 06:06:34 pm by tautech »
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #81 on: June 29, 2018, 05:57:45 pm »
Looks to me that this is only to tell the SA what calibration set to use: Factory, User or None. I don't think you can enter individual parameters.
Keyboard error: Press F1 to continue.
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #82 on: June 29, 2018, 10:40:20 pm »
6. Modify Cal kit (not available)
Use user defined calibration kit
Seems to me that Siglent released an unfinished firmware with the SVA1015X. Waiting for a full review and teardown.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #83 on: June 30, 2018, 06:39:02 pm »
Serial U-Boot output:

Code: [Select]
U-Boot 2014.07-svn32893 (Apr 27 2018 - 17:38:15)

Board: Xilinx Zynq
I2C:   ready
DRAM:  ECC disabled 128 MiB
NAND:  256 MiB
MMC:   zynq_sdhci: 0
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
int board_late_init(void)+++++
buzzer_off---------------
buzzer_on---------------
buzzer_off---------------
int board_late_init(void)-----
Net:   Gem.e000b000
Hit any key to stop autoboot:  0
(Re)start USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
USB1:   ULPI request timed out
zynq ULPI viewport init failed
lowlevel init failed
       scanning usb for storage devices... 0 Storage Device(s) found
Copying Linux from USB to RAM...
** Bad device usb 0 **
** Bad device usb 0 **
Copying Linux from NAND flash to RAM...

NAND read: device 0 offset 0x780000, size 0x400000
 4194304 bytes read: OK

NAND read: device 0 offset 0xb80000, size 0x80000
 524288 bytes read: OK
## Booting kernel from Legacy Image at 02080000 ...
   Image Name:   Linux-3.19.1-omg-xilinx-svn32835
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    3016264 Bytes = 2.9 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 02000000
   Booting using the fdt blob at 0x2000000
EHCI failed to shut down host controller.
   Loading Kernel Image ... OK
   Loading Device Tree to 06d0e000, end 06d14ec2 ... OK

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 3.19.1-omg-xilinx-svn32835 (david@david-virtual-machine) (gcc version 4.7.2 (Sourcery CodeBench Lite 2012.09-104) ) #13 SMP PREEMPT Sat May 5 08:53:46 CST 2018
[    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=18c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine model: Zynq Zed Development Board
[    0.000000] cma: Reserved 16 MiB at 0x09000000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] PERCPU: Embedded 9 pages/cpu @48e92000 s8128 r8192 d20544 u36864
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 40640
[    0.000000] Kernel command line: console=ttyPS0,115200 root=/dev/mtdblock5 rootfstype=cramfs init=/linuxrc earlyprintk uboot_version=2
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Memory: 139680K/163840K available (3872K kernel code, 213K rwdata, 1568K rodata, 196K init, 216K bss, 7776K reserved, 16384K cma-reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0x4a800000 - 0xff000000   (2888 MB)
[    0.000000]     lowmem  : 0x40000000 - 0x4a000000   ( 160 MB)
[    0.000000]     pkmap   : 0x3fe00000 - 0x40000000   (   2 MB)
[    0.000000]     modules : 0x3f000000 - 0x3fe00000   (  14 MB)
[    0.000000]       .text : 0x40008000 - 0x40558638   (5442 kB)
[    0.000000]       .init : 0x40559000 - 0x4058a000   ( 196 kB)
[    0.000000]       .data : 0x4058a000 - 0x405bf6e0   ( 214 kB)
[    0.000000]        .bss : 0x405bf6e0 - 0x405f5954   ( 217 kB)
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] L2C: platform modifies aux control register: 0x72360000 -> 0x72760000
[    0.000000] L2C: DT/platform modifies aux control register: 0x72360000 -> 0x72760000
[    0.000000] L2C-310 erratum 769419 enabled
[    0.000000] L2C-310 enabling early BRESP for Cortex-A9
[    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
[    0.000000] L2C-310 ID prefetch enabled, offset 1 lines
[    0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled
[    0.000000] L2C-310 cache controller enabled, 8 ways, 512 kB
[    0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x76760001
[    0.000000] slcr mapped to 4a804000
[    0.000000] zynq_clock_init: clkc starts at 4a804100
[    0.000000] Zynq clock init
[    0.000010] sched_clock: 64 bits at 333MHz, resolution 3ns, wraps every 3298534883328ns
[    0.000128] timer #0 at 4a806000, irq=17
[    0.000481] Console: colour dummy device 80x30
[    0.000500] Calibrating delay loop... 1332.01 BogoMIPS (lpj=6660096)
[    0.090269] pid_max: default: 32768 minimum: 301
[    0.090420] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.090437] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.091053] CPU: Testing write buffer coherency: ok
[    0.091241] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.091313] Setting up static identity map for 0x3a6188 - 0x3a61e0
[    0.240257] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.240332] Brought up 2 CPUs
[    0.240352] SMP: Total of 2 processors activated (2664.03 BogoMIPS).
[    0.240361] CPU: All CPU(s) started in SVC mode.
[    0.240860] devtmpfs: initialized
[    0.241562] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
[    0.247087] NET: Registered protocol family 16
[    0.249034] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.271072] cpuidle: using governor ladder
[    0.301037] cpuidle: using governor menu
[    0.309296] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
[    0.309311] hw-breakpoint: maximum watchpoint size is 4 bytes.
[    0.309443] zynq-ocm f800c000.ocmc: ZYNQ OCM pool: 256 KiB @ 0x4a880000
[    0.320059] vgaarb: loaded
[    0.320491] SCSI subsystem initialized
[    0.320904] usbcore: registered new interface driver usbfs
[    0.320996] usbcore: registered new interface driver hub
[    0.321126] usbcore: registered new device driver usb
[    0.321276] phy0 supply vcc not found, using dummy regulator
[    0.321372] phy1 supply vcc not found, using dummy regulator
[    0.321496] --------------usb_udc_init ------
[    0.321762] pps_core: LinuxPPS API ver. 1 registered
[    0.321775] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti[member=183778]linux[/member].it>
[    0.321826] PTP clock support registered
[    0.321975] EDAC MC: Ver: 3.0.0
[    0.323433] Switched to clocksource arm_global_timer
[    0.335124] NET: Registered protocol family 2
[    0.335898] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[    0.335939] TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
[    0.335990] TCP: Hash tables configured (established 2048 bind 2048)
[    0.336037] TCP: reno registered
[    0.336055] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.336085] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.336282] NET: Registered protocol family 1
[    0.336591] RPC: Registered named UNIX socket transport module.
[    0.336604] RPC: Registered udp transport module.
[    0.336613] RPC: Registered tcp transport module.
[    0.336621] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.336970] hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
[    0.338305] futex hash table entries: 512 (order: 3, 32768 bytes)
[    0.339882] jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
[    0.340843] io scheduler noop registered
[    0.340862] io scheduler deadline registered
[    0.340915] io scheduler cfq registered (default)
[    0.342896] dma-pl330 f8003000.dmac: Loaded driver for PL330 DMAC-241330
[    0.342918] dma-pl330 f8003000.dmac: DBUFF-128x8bytes Num_Chans-8 Num_Peri-4 Num_Events-16
[    0.343367] e0001000.serial: ttyPS0 at MMIO 0xe0001000 (irq = 145, base_baud = 2500000) is a xuartps
[    0.917584] console [ttyPS0] enabled
[    0.921720] xdevcfg f8007000.devcfg: ioremap 0xf8007000 to 4a878000
[    0.928486] [drm] Initialized drm 1.1.0 20060810
[    0.940739] brd: module loaded
[    0.947628] loop: module loaded
[    0.956223] libphy: MACB_mii_bus: probed
[    1.033564] macb e000b000.ethernet eth0: Cadence GEM rev 0x00020118 at 0xe000b000 irq 149 (00:0a:35:00:01:22)
[    1.043462] macb e000b000.ethernet eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=e000b000.etherne:1e, irq=-1)
[    1.055011] i2c /dev entries driver
[    1.060195] rtc-ds1307 0-0068: rtc core: registered ds1340 as rtc0
[    1.066640] cdns-i2c e0004000.i2c: 400 kHz mmio e0004000 irq 143
[    1.073933] zynq-edac f8006000.memory-controller: ecc not enabled
[    1.080149] Xilinx Zynq CpuIdle Driver started
[    1.085215] ledtrig-cpu: registered to indicate activity on CPUs
[    1.092190] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
[    1.098498] nand: Micron MT29F2G08ABAEAWP
[    1.102478] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[    1.110070] nand: WARNING: pl353-nand: the ECC used on your system is too weak compared to the one required by the NAND chip
[    1.121573] Bad block table found at page 131008, version 0x01
[    1.127844] Bad block table found at page 130944, version 0x01
[    1.133967] 11 ofpart partitions found on MTD device pl353-nand
[    1.139815] Creating 11 MTD partitions on "pl353-nand":
[    1.145071] 0x000000000000-0x000000780000 : "fsbl"
[    1.150867] 0x000000780000-0x000000b80000 : "kerneldata"
[    1.157124] 0x000000b80000-0x000000c00000 : "device-tree"
[    1.163411] 0x000000c00000-0x000001100000 : "Manufacturedata"
[    1.170098] 0x000001100000-0x000001600000 : "reserved1"
[    1.176294] 0x000001600000-0x000003e00000 : "rootfs"
[    1.182152] 0x000003e00000-0x000004800000 : "firmdata0"
[    1.188269] 0x000004800000-0x000006c00000 : "siglent"
[    1.194289] 0x000006c00000-0x00000d000000 : "datafs"
[    1.200256] 0x00000d000000-0x00000da00000 : "log"
[    1.205905] 0x00000da00000-0x000010000000 : "upgrade_cramdisk"
[    1.214709] TCP: cubic registered
[    1.217961] NET: Registered protocol family 17
[    1.222628] Registering SWP/SWPB emulation handler
[    1.229223] rtc-ds1307 0-0068: setting system clock to 2018-06-30 16:36:51 UTC (1530376611)
[    1.242527] cramfs_fill_nand blocks is 320-----------------------
[    1.242527]
[    1.242527]
[    1.242527]
[    1.255562] VFS: Mounted root (cramfs filesystem) readonly on device 31:5.
[    1.262413] devtmpfs: mounted
[    1.265628] Freeing unused kernel memory: 196K (40559000 - 4058a000)
Starting rcS...
[    1.539847] UBI-1: ubi_attach_mtd_dev:attaching mtd7 to ubi1
[    1.687520] UBI-1: scan_all:scanning is finished
[    1.698499] UBI-1 warning: print_rsvd_warning: cannot reserve enough PEBs for bad PEB handling, reserved 3, need 40
[    1.709601] UBI-1: ubi_attach_mtd_dev:attached mtd7 (name "siglent", size 36 MiB)
[    1.717060] UBI-1: ubi_attach_mtd_dev:PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    1.725645] UBI-1: ubi_attach_mtd_dev:min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    1.734168] UBI-1: ubi_attach_mtd_dev:VID header offset: 2048 (aligned 2048), data offset: 4096
[    1.742853] UBI-1: ubi_attach_mtd_dev:good PEBs: 288, bad PEBs: 0, corrupted PEBs: 0
[    1.750624] UBI-1: ubi_attach_mtd_dev:user volume: 1, internal volumes: 1, max. volumes count: 128
[    1.759575] UBI-1: ubi_attach_mtd_dev:max/mean erase counter: 2/0, WL threshold: 4096, image sequence number: 900188599
[    1.770360] UBI-1: ubi_attach_mtd_dev:available PEBs: 0, total reserved PEBs: 288, PEBs reserved for bad PEB handling: 3
[    1.781249] UBI-1: ubi_thread:background thread "ubi_bgt1d" started, PID 574
[    1.783663] UBI-2: ubi_attach_mtd_dev:attaching mtd6 to ubi2
[    1.827744] UBI-2: scan_all:scanning is finished
[    1.838539] UBI-2 warning: print_rsvd_warning: cannot reserve enough PEBs for bad PEB handling, reserved 9, need 40
[    1.849552] UBI-2: ubi_attach_mtd_dev:attached mtd6 (name "firmdata0", size 10 MiB)
[    1.857174] UBI-2: ubi_attach_mtd_dev:PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    1.865775] UBI-2: ubi_attach_mtd_dev:min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    1.874299] UBI-2: ubi_attach_mtd_dev:VID header offset: 2048 (aligned 2048), data offset: 4096
[    1.882984] UBI-2: ubi_attach_mtd_dev:good PEBs: 80, bad PEBs: 0, corrupted PEBs: 0
[    1.890656] UBI-2: ubi_attach_mtd_dev:user volume: 1, internal volumes: 1, max. volumes count: 128
[    1.899617] UBI-2: ubi_attach_mtd_dev:max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 1004679339
[    1.910490] UBI-2: ubi_attach_mtd_dev:available PEBs: 0, total reserved PEBs: 80, PEBs reserved for bad PEB handling: 9
[    1.921298] UBI-2: ubi_thread:background thread "ubi_bgt2d" started, PID 578
[    1.925091] UBI-3: ubi_attach_mtd_dev:attaching mtd9 to ubi3
[    1.967761] UBI-3: scan_all:scanning is finished
[    1.978551] UBI-3 warning: print_rsvd_warning: cannot reserve enough PEBs for bad PEB handling, reserved 9, need 40
[    1.989580] UBI-3: ubi_attach_mtd_dev:attached mtd9 (name "log", size 10 MiB)
[    1.996677] UBI-3: ubi_attach_mtd_dev:PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    2.005277] UBI-3: ubi_attach_mtd_dev:min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    2.013829] UBI-3: ubi_attach_mtd_dev:VID header offset: 2048 (aligned 2048), data offset: 4096
[    2.022489] UBI-3: ubi_attach_mtd_dev:good PEBs: 80, bad PEBs: 0, corrupted PEBs: 0
[    2.030160] UBI-3: ubi_attach_mtd_dev:user volume: 1, internal volumes: 1, max. volumes count: 128
[    2.039119] UBI-3: ubi_attach_mtd_dev:max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 1800024413
[    2.050011] UBI-3: ubi_attach_mtd_dev:available PEBs: 0, total reserved PEBs: 80, PEBs reserved for bad PEB handling: 9
[    2.060797] UBI-3: ubi_thread:background thread "ubi_bgt3d" started, PID 582
[    2.062964] UBI-0: ubi_attach_mtd_dev:attaching mtd8 to ubi0
[    2.461604] UBI-0: scan_all:scanning is finished
[    2.473888] UBI-0: ubi_attach_mtd_dev:attached mtd8 (name "datafs", size 100 MiB)
[    2.481311] UBI-0: ubi_attach_mtd_dev:PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    2.489969] UBI-0: ubi_attach_mtd_dev:min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    2.498464] UBI-0: ubi_attach_mtd_dev:VID header offset: 2048 (aligned 2048), data offset: 4096
[    2.507164] UBI-0: ubi_attach_mtd_dev:good PEBs: 800, bad PEBs: 0, corrupted PEBs: 0
[    2.514917] UBI-0: ubi_attach_mtd_dev:user volume: 1, internal volumes: 1, max. volumes count: 128
[    2.523870] UBI-0: ubi_attach_mtd_dev:max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 1599474356
[    2.534743] UBI-0: ubi_attach_mtd_dev:available PEBs: 0, total reserved PEBs: 800, PEBs reserved for bad PEB handling: 40
[    2.545718] UBI-0: ubi_thread:background thread "ubi_bgt0d" started, PID 586
[    2.559346] UBIFS: background thread "ubifs_bgt1_0" started, PID 589
[    2.591019] UBIFS: recovery needed
[    2.613820] UBIFS: recovery completed
[    2.617495] UBIFS: mounted UBI device 1, volume 0, name "siglent"
[    2.623551] UBIFS: LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[    2.632656] UBIFS: FS size: 34410496 bytes (32 MiB, 271 LEBs), journal size 4952064 bytes (4 MiB, 39 LEBs)
[    2.642328] UBIFS: reserved for root: 0 bytes (0 KiB)
[    2.647374] UBIFS: media format: w4/r0 (latest is w4/r0), UUID 1B35F70A-67F4-455E-858F-2F422846CECF, small LPT model
[    2.731478] UBIFS: mounted UBI device 2, volume 0, name "firm0", R/O mode
[    2.738227] UBIFS: LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[    2.747357] UBIFS: FS size: 7237632 bytes (6 MiB, 57 LEBs), journal size 1650688 bytes (1 MiB, 13 LEBs)
[    2.756753] UBIFS: reserved for root: 0 bytes (0 KiB)
[    2.761783] UBIFS: media format: w4/r0 (latest is w4/r0), UUID 448AD2DE-5809-49DA-B1CD-2C0D40CAB686, small LPT model
[    2.775686] UBIFS: background thread "ubifs_bgt3_0" started, PID 592
[    2.807286] UBIFS: recovery needed
[    2.830050] UBIFS: recovery completed
[    2.833738] UBIFS: mounted UBI device 3, volume 0, name "log"
[    2.839410] UBIFS: LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[    2.848563] UBIFS: FS size: 7237632 bytes (6 MiB, 57 LEBs), journal size 1650688 bytes (1 MiB, 13 LEBs)
[    2.857950] UBIFS: reserved for root: 0 bytes (0 KiB)
[    2.862991] UBIFS: media format: w4/r0 (latest is w4/r0), UUID B840F246-98FF-4F06-BE7D-E132F60B19EF, small LPT model
[    2.876123] UBIFS: background thread "ubifs_bgt0_0" started, PID 594
[    2.907633] UBIFS: recovery needed
[    2.994601] UBIFS: recovery completed
[    2.998279] UBIFS: mounted UBI device 0, volume 0, name "rootfs"
[    3.004238] UBIFS: LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[    3.013351] UBIFS: FS size: 94597120 bytes (90 MiB, 745 LEBs), journal size 9023488 bytes (8 MiB, 72 LEBs)
[    3.023015] UBIFS: reserved for root: 0 bytes (0 KiB)
[    3.028070] UBIFS: media format: w4/r0 (latest is w4/r0), UUID 291F26AC-980A-4DA3-9D84-E1F581557A7E, small LPT model
rm: can't remove '/usr/bin/siglent/usr/mass_storage/U-disk*': No such file or directory
rm: can't remove '/usr/bin/siglent/usr/tmp/*_U-disk*': No such file or directory
[    4.043780] Unhandled fault: external abort on non-linefetch (0x818) at 0x36fc9380
Bus error
[    4.070882] irq = 170
[    4.081429] <<-GTP-INFO->> GTP driver installing...
[    4.086502] <<-GTP-INFO->> GTP Driver Version: V2.4<2014/11/28>
[    4.092358] <<-GTP-INFO->> GTP Driver Built[member=136418]22[/member]:06:06, Apr 27 2018
[    4.098487] <<-GTP-INFO->> GTP I2C Address: 0x14
[    4.103081] 0-0014 supply vdd_ana not found, using dummy regulator
[    4.109362] 0-0014 supply vcc_i2c not found, using dummy regulator
[    4.115606] <<-GTP-INFO->> Guitar reset
[    4.243928] <<-GTP-INFO->> IC Version: 928_1060
[    4.254344] <<-GTP-INFO->> X_MAX: 1024, Y_MAX: 600, TRIGGER: 0x00
[    4.273459] <<-GTP-INFO->> create proc entry gt9xx_config success
[    4.279740] input: goodix-ts as /devices/virtual/input/input0
[    4.285735] <<-GTP-INFO->> GTP works in interrupt mode.
[    4.323262] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    4.334157] ehci-pci: EHCI PCI platform driver
[    4.381946] e0002000.usb supply vbus not found, using dummy regulator
[    4.388855] ci_hdrc ci_hdrc.0: EHCI Host Controller
[    4.393754] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[    4.413538] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[    4.419044] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    4.425829] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    4.432993] usb usb1: Product: EHCI Host Controller
[    4.437921] usb usb1: Manufacturer: Linux 3.19.1-omg-xilinx-svn32835 ehci_hcd
[    4.445039] usb usb1: SerialNumber: ci_hdrc.0
[    4.450186] hub 1-0:1.0: USB hub found
[    4.453952] hub 1-0:1.0: 1 port detected
[    4.458822] e0003000.usb supply vbus not found, using dummy regulator
[    4.518256] usbcore: registered new interface driver usb-storage
[    4.545611] usbcore: registered new interface driver usbhid
[    4.551119] usbhid: USB HID core driver
[    4.561849] mousedev: PS/2 mouse device common for all mice
###### Config vdma3 for wave transform for vnc  #######
0x00000000
###### Config vdma3  done
###### Config vdma3 for wave transform for vnc  #######
0x00000000
###### Config vdma3  done
ln: /usr/bin/siglent/config/www/web_img/usr: File exists
Starting Lighttpd Web Server: [    4.930257] random: lighttpd urandom read with 17 bits of entropy available
Initializing framebuffer device /dev/fb0...
xres=1024, yres=600, xresv=1024, yresv=600, xoffs=0, yoffs=0, bpp=16[    4.982700] input: PolyVision Touch Screen as /devices/virtual/input/input1

Initializing touch device /dev/input/event0 ...
Initializing touch device /dev/input/event0 ...
Reading From :(goodix-ts)
buttonMask: xmin:0
xmax: 1024
ymin:0
ymax: 600
Initializing VNC server:
width:  1024
height: 600
bpp:    16
port:   5900
Initializing server...
30/06/2018 16:36:55 Listening for VNC connections on TCP port 5900
lighttpd.
rcS Complete


(none) login: [    7.255606] <<-GTP-INFO->> System resume.
[    7.255617] gpio-963 (GTP INT IRQ): _gpiod_direction_output_raw: tried to set a GPIO tied to an IRQ as output
[    7.273650] <<-GTP-INFO->> GTP wakeup sleep.
[    7.273660] gpio-963 (GTP INT IRQ): _gpiod_direction_output_raw: tried to set a GPIO tied to an IRQ as output
rotationAngle:  0 invertx:  false inverty:  false
rotationAngle:  0 invertx:  false inverty:  false
[1B][32mInfo: ../../ecomb2.0A/ecomb/main.cpp 50 msg: main start[1B][0m
[1B][32mInfo: ../../ecomb2.0A/ecomb/collectdata/Driver/ZynqDriver/HwAcess/ecomb_hw[    7.866402] spidev spi1.1: setup: unsupported mode bits e8
access.cpp 68 msg: open(Spi0Dev1Name, O_RDWR) sucess !!!   /dev/spidev0.1[1B][0m
[1B][32mInfo: ../../ecomb2.0A/ecomb/collectdata/Driver/ZynqDriver/HwAcess/ecomb_hwaccess.cpp 94 msg: open(Spi1DevName, O_RDWR) sucess !!!   /dev/spidev1.1[1B][0m
[1B][32mInfo: ../../ecomb2.0A/ecomb/collectdata/Driver/ZynqDriver/HwAcess/ecomb_hwaccess.cpp 117 msg: open(i2c0DevName, O_RDWR) sucess !!!   /dev/i2c-0[1B][0m
 Len = Check_WriteFlag(addr) == 7
info[i].keyword == 1015
info[i].license == n27a9nd3d8tembmw
info[i].RemainTime == 0
info[i].keyword == AMK
info[i].license == z23g22puf442pzfx
info[i].RemainTime == 0
info[i].keyword == EMI
info[i].license == gpgwxvg3nssg7pv9
info[i].RemainTime == 0
info[i].keyword == DTF
info[i].license == cum6sna36ijz3e9d
info[i].RemainTime == 0
info[i].keyword == VNA
info[i].license == 622si3crra2in5ny
info[i].RemainTime == 0
info[i].keyword == tTG
info[i].license == akd28gtcs5kfp5mr
info[i].RemainTime == 7650
info[i].keyword == tDMA
info[i].license == 2ba7jn2tz7srx4sk
info[i].RemainTime == 7650
sh: service: not found
udhcpc: started, v1.26.0.git
Setting IP address 0.0.0.0 on eth0
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing
FpgaBase::get_instance().FpgaWrite(0x124, 0); FpgaBase::get_instance().FpgaWrite(0x124, 0); FpgaBase::get_instance().FpgaWrite(0x124, 0);
Hmc703PLL1Read(0x3, &val)  == 0x4b
PLL1_Driver::Inital()!!

[1B][32mInfo: true english[1B][0m
[1B][32mInfo: true[1B][0m
+++++++++AnalyzerWidget::initCollectInfo()
case msgSetFreqAndBw m_normalFreqAndBwInfo.startFreq== 0, m_normalFreqAndBwInfo.stopFreq== 1500000000, m_normalFreqAndBwInfo.span == 1500000000
 msgSetFreqAndBw  33333333333333333333
___________________----m_freqCounter.enable == 0
-----------------AnalyzerWidget::initCollectInfo()
[1B][33mWarn: QObject::connect: No such slot AnalyzerWidget::dealDemodModez()[1B][0m
[1B][33mWarn: QObject::connect: No such slot AnalyzerWidget::dealDemodEarphone()[1B][0m
[1B][33mWarn: QObject::connect: No such signal AnalyzerScpi::uiPlotsetMeasBWDispAmpt(double, double)[1B][0m
[1B][32mInfo: __arm__[1B][0m
[1B][32mInfo: ../../ecomb2.0A/ecomb/collectdata/Driver/ZynqDriver/HwAcess/axi_dma_driver.cpp 44 msg: open dev  sucess !!!       /dev/siglent_axidma[1B][0m[   23.458073] ######################### usb_gadget_probe_driver 3f085598 ##################

initFFTDetector m_bukectNum == 751
initFFTDetector m_rawDataNum == 4501
initFFTDetector decList.size == 751
initFFTDetector decList.max == 45[   23.477479] usbtmc_bind+++
00
[1B][32mInfo: ../../ecomb2.0A/ecomb/drivers/GpioIntr/EcombZynq/[   23.485668] SIGLENT_DEV: SIGLENT_DEV, version: 2007 OCT 06
keyboard.cpp 38 msg: #######Enter KeyBoard[1B][0m
[1B][32mInfo: ../..[   23.495805] usbtmc_open()++
/ecomb2.0A/ecomb/drivers/GpioIntr/EcombZynq/miscintr.cpp 13 msg:[   23.503075] dev->usbtmc_cdev_open ret = 0
 #######Enter MiscIntr[1B][0m
NormalDetector::SetRawDataInfo m_raw[   23.512843] ret = 0
DataFreqStart == 0,  m_step== 333333.333333,m_rawDataLength== 45[   23.521170] usbtmc_open--
01
NormalDetector::SetRawDataInfo m_DecList.size() == 751,  m_D[   23.528635] show_send_buffer_size = 61440
ecList[0]== 2, m_DecList[m_DecList.size(0-1)]== 4500
[  124.515493] random: nonblocking pool is initialized
« Last Edit: June 30, 2018, 06:56:09 pm by EEVblog »
 
The following users thanked this post: klaus11

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #84 on: June 30, 2018, 06:42:47 pm »
Quote
Copying Linux from USB to RAM...
** Bad device usb 0 **
** Bad device usb 0 **

 >:D

It can boot from USB...
Keyboard error: Press F1 to continue.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #85 on: June 30, 2018, 06:47:22 pm »
Listening for VNC connections on TCP port 5900

 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #86 on: June 30, 2018, 06:48:12 pm »
Plug in a keyboard and you get

Code: [Select]
[  586.143456] cdns-i2c e0004000.i2c: timeout waiting on completion
[  586.323466] cdns-i2c e0004000.i2c: timeout waiting on completion
[  586.503466] cdns-i2c e0004000.i2c: timeout waiting on completion
[  591.513540] usb 1-1: new low-speed USB device number 2 using ci_hdrc
[  591.688016] usb 1-1: New USB device found, idVendor=045e, idProduct=0732
[  591.697386] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  591.704549] usb 1-1: Product: Microsoft® Digital Media oard 3000
[  591.710579] usb 1-1: Manufacturer: Microsoft
[  591.735066] input: Microsoft Microsoft® Digital Media oard 3000 as /devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1/1-1:1.0/0003:045E:0732.0001/input/input2
[  591.823781] hid-generic 0003:045E:0732.0001: input: USB HID v1.11 Keyboard [Microsoft Microsoft® Digital Media oard 3000] on usb-ci_hdrc.0-1/input0
[  591.856938] input: Microsoft Microsoft® Digital Media oard 3000 as /devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1/1-1:1.1/0003:045E:0732.0002/input/input3
[  591.923845] hid-generic 0003:045E:0732.0002: input: USB HID v1.11 Device [Microsoft Microsoft® Digital Media oard 3000] on usb-ci_hdrc.0-1/input1

Shutdown is just:

Code: [Select]
before sleep 0.1S
sleep 0.5S
shut down 
[00]
 
The following users thanked this post: klaus11

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #87 on: June 30, 2018, 06:53:29 pm »
Umm, it's dumping out license strings...  :o
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #88 on: June 30, 2018, 07:03:45 pm »
Umm, it's dumping out license strings...  :o

Probably only working with the right serial # anyway.
Keyboard error: Press F1 to continue.
 

Offline bson

  • Supporter
  • ****
  • Posts: 1495
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #89 on: July 01, 2018, 10:57:03 pm »
Listening for VNC connections on TCP port 5900
Now, that's pretty neat if it actually works!!!
 

Offline taydin

  • Frequent Contributor
  • **
  • Posts: 334
  • Country: tr
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #90 on: July 02, 2018, 03:15:25 am »
Let's do a little summary on what kinds of applications this 1.5 GHz VNA would be useable. The ones I can think of at this moment:

- RF wireless remote controls (433 MHz is common)
- FM radio
- Amateur radio
- 27 MHz RC electronics
- GPS (marginally)
- UHF based CCTV cameras
- GSM radios
- RFID

Lots of applications really. But anything in the ISM band and 802.11ac WIFI is out. Other applications like RADAR are out, too, but those are not the target segment for this kind of device anyway.

Maybe others can chime in on what kind of applications this would be good for so that people can make better decisions :)
Real programmers use machine code!

My hobby projects http://mekatronik.org/forum
 

Online joeqsmith

  • Super Contributor
  • ***
  • Posts: 5240
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #91 on: July 02, 2018, 03:35:06 am »
First I've seen this thread.  Watched their video from 4 days ago.   Nice looking unit.   Maybe I can replace my old HP8754A.   
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #92 on: July 02, 2018, 06:00:11 am »
[...]
But anything in the ISM band and 802.11ac WIFI is out. Other applications like RADAR are out, too, but those are not the target segment for this kind of device anyway.
[...]

Maybe it's easier to day that anything that exceeds its bandwidth is out... there are quite a few ISM bands below 1500 MHz.
Lots of M2M (machine to machine, do I dare say IoT) uses the 865MHz/915MHz band for example, I'd imagine the VNA is sufficient for antenna measurements.
 

Online joeqsmith

  • Super Contributor
  • ***
  • Posts: 5240
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #93 on: July 02, 2018, 06:02:41 am »
Let's do a little summary on what kinds of applications this 1.5 GHz VNA would be useable. The ones I can think of at this moment:

- RF wireless remote controls (433 MHz is common)
- FM radio
- Amateur radio
- 27 MHz RC electronics
- GPS (marginally)
- UHF based CCTV cameras
- GSM radios
- RFID

Lots of applications really. But anything in the ISM band and 802.11ac WIFI is out. Other applications like RADAR are out, too, but those are not the target segment for this kind of device anyway.

Maybe others can chime in on what kind of applications this would be good for so that people can make better decisions :)

Just a few home projects I have shown on this site where I would have used it:

I am currently working on an active HV wideband differential probe that I could use it on. 

Designing custom made wideband HV single ended passive probes.
Redesigning the UNI-T UT210E current probe to increase it's bandwidth from 3KHz to 100KHz.
Designing your own HV differential probe.
Redesigning the Tektronix P6042 to increase it's bandwidth from 50MHz to about 100MHz. 

Looks like they support National Instruments, a must have.   
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #94 on: July 02, 2018, 06:30:58 am »
@ joeqsmith
So does this instrument interest you more that the existing SSA3000X models ?
Avid Rabid Hobbyist
 

Online joeqsmith

  • Super Contributor
  • ***
  • Posts: 5240
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #95 on: July 02, 2018, 08:32:26 am »
@ joeqsmith
So does this instrument interest you more that the existing SSA3000X models ?

Yes. 

I've thought about getting an 8753 but they are getting fairly old now themselves.  Then finding all the parts to put one together.  I looked at Copper Mountain a couple years ago.    With the help of Labview, the 8754A still does the basics for my higher frequency projects.   
How electrically robust is your meter?? https://www.youtube.com/channel/UCsK99WXk9VhcghnAauTBsbg
 
The following users thanked this post: tautech

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #96 on: July 02, 2018, 08:45:18 am »
Thanks Joe, nice looking bits of old HP.  :)
Member hendorog who's much better at this RF stuff than I will get the SVA I have coming for some tests and comparison against a HPAK VNA he has, so watch for his findings in the next week or so.
Avid Rabid Hobbyist
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #97 on: July 02, 2018, 07:30:45 pm »
Was playing with it today shooting a teardown video. Seemingly fairly basic VNA capability compared with the USB ones with all their bells and whistles, but probably going to very usable for lots of apps. Shame that everything is optional extra though. Even the cal kit is like $360 or something.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #98 on: July 04, 2018, 04:21:29 pm »
In the middle of the teardown video, not there yet, but thought I'd post a preliminary teardown block comparison with the SSA3000
Not seeing much in the way of VNA hardware yet. Seems to be a lower frequency implementation of the SSA3000 as you'd expect, with IF ADC in the RF block this time instead of external.

https://imgur.com/RRAg8Am

 
The following users thanked this post: hendorog, klaus11

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #99 on: July 04, 2018, 04:38:47 pm »
And the tracking gen comparison

 
The following users thanked this post: thm_w, electricForce, hendorog, klaus11

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #100 on: July 04, 2018, 04:41:16 pm »
A vertical arrangement that is better for the forum:

 
The following users thanked this post: klaus11

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #101 on: July 04, 2018, 07:29:56 pm »
Very nice, really helpful to see them side by side like that. Did you do a sneaky mirror on the images to make them match?

The only very minor thing I can see is the arrows from the First LO out to the TG on the main board should be going the other way.
 
The following users thanked this post: electricForce, Johncanfield

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #102 on: July 06, 2018, 10:38:42 am »
Very nice, really helpful to see them side by side like that. Did you do a sneaky mirror on the images to make them match?

Yes, I had to flip the image in order to match them up because the new ones has the components on the other side to the previous SSA3000 board.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Avid Rabid Hobbyist
 

Offline TurboTom

  • Frequent Contributor
  • **
  • Posts: 515
  • Country: de
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #104 on: July 07, 2018, 10:42:50 pm »
Dave, thanks for the teardown, that was quite interesting.
A few things to add, some might be trivial and some rather peculiar:

In contrary to the high bandwidth SSA3000 series, Siglent doesn't use the special Rogers (or equivalent) high frequency PCB material but rather some impedance-controlled FR4. That way, it's much cheaper to produce and it makes complete sense to have an "almost" single-board solution for the instrument. In that regards, it's very similar to the Rigol DSA815 design which covers the same frequency range.

In Dave's video at 19:02, there's a close-up of the Port1 interface shown. Since I didn't quite believe that Siglent got along without a directional coupler for their VNA functionality, I dared to have a closer look, see the attached screenshot. There is a tiny multilayer coupler installed (similar to this one https://www.mouser.de/datasheet/2/400/tdk_02022018_HHM22152A2_ver4_1(Oct.2017)-1284660.pdf), yet highly surprisingly it's not located directly at the port but behind a switch and an impedance matching network / attenuator. I wonder how good the isolation/directivity characteristics of the circuitry are. If you look at the efforts the "big brands" in their boat anchors took some 25+ years ago to achieve really good directivity (see attached photo of an opened-up coupler of a HP 85046B test set, belonging to a 8753C VNA), it's hard to believe that despite all the advances in microcircuitry, manufacturers were able to shrink an assembly that much without sacrificing some quality/performance... I may be wrong, though  ;).

What's also quite peculiar is that apparently Siglent got away with a single receiver channel. In order to get a proper phase relation between the measured signal from the DUT and the output signal provided by the VNA, the VNA would have to make a correlation of a portion of the generator signal to the measurement signal. For that purpose, "classic" VNAs have at least two input channels, one of them labeled "R" for "Reference". Since the SVA1015X clearly has only a single channel (with some switching circuitry albeit), it must manage the comparison between reference and measurement signal via that single channel in a multiplexed manner, making sure that the generator's phase is stable enough while "looking" at the measurement signal that no siginificant phase error is introduced during that time.

Altogether, the SVA1015X appears to be a real "budget instrument", much more so than the SSA3000X and it's probably focused on the Radio Amateur or eductional market. Nothing wrong with that, I only agree with Dave that an instrument advertised as a VNA should include that function off-the-shelf and should not require the puchase af an additional, not really inexpensive option to be usable as a VNA.

Cheers,
Thomas
 
The following users thanked this post: EEVblog, KE5FX, graybeard

Offline ThomasDK

  • Regular Contributor
  • *
  • Posts: 108
  • Country: dk
  • B.Eng. EE
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #105 on: July 07, 2018, 11:37:42 pm »
[...]yet highly surprisingly it's not located directly at the port but behind a switch and an impedance matching network / attenuator. I wonder how good the isolation/directivity characteristics of the circuitry are. If you look at the efforts the "big brands" in their boat anchors took some 25+ years ago to achieve really good directivity (see attached photo of an opened-up coupler of a HP 85046B test set, belonging to a 8753C VNA), it's hard to believe that despite all the advances in microcircuitry, manufacturers were able to shrink an assembly that much without sacrificing some quality/performance... I may be wrong, though  ;).

I thought the same last night after watching the video. Coupling will be horrible at the low frequency range, so I expect a low SNR. There is probably a reason for the lack of accuracy specs in the datasheet ;)

Quote
What's also quite peculiar is that apparently Siglent got away with a single receiver channel. In order to get a proper phase relation between the measured signal from the DUT and the output signal provided by the VNA, the VNA would have to make a correlation of a portion of the generator signal to the measurement signal. For that purpose, "classic" VNAs have at least two input channels, one of them labeled "R" for "Reference". Since the SVA1015X clearly has only a single channel (with some switching circuitry albeit), it must manage the comparison between reference and measurement signal via that single channel in a multiplexed manner, making sure that the generator's phase is stable enough while "looking" at the measurement signal that no siginificant phase error is introduced during that time
Looks like the same principle as Henriks's 200€ VNA:
http://hforsten.com/improved-homemade-vna.html

It's crude, but it does work.
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #106 on: July 08, 2018, 01:02:11 am »
Doesn’t require a full second receiver, all you need is to compare the phase out of the tracking generator to the phase at the input port.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer (Coming)
« Reply #107 on: July 08, 2018, 01:14:08 am »
Does the VNA option include the calibration KIT?

No, I believe it's separate.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 28376
  • Country: au
    • EEVblog
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #108 on: July 08, 2018, 01:19:56 am »
In Dave's video at 19:02, there's a close-up of the Port1 interface shown. Since I didn't quite believe that Siglent got along without a directional coupler for their VNA functionality, I dared to have a closer look, see the attached screenshot. There is a tiny multilayer coupler installed (similar to this one https://www.mouser.de/datasheet/2/400/tdk_02022018_HHM22152A2_ver4_1(Oct.2017)-1284660.pdf

Ah, so it is, nice catch. Tiny sucker, easy to miss.
 

Offline TurboTom

  • Frequent Contributor
  • **
  • Posts: 515
  • Country: de
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #109 on: July 08, 2018, 03:58:22 am »
Doesn’t require a full second receiver, all you need is to compare the phase out of the tracking generator to the phase at the input port.

Yes, in principle you are right. But how does one (the instrument) "know" the phase at the tracking generator output?. After all the mixers, gain blocks and filters, even though in theory it may be possible to calculate it, you can not be sure to even getting close to the accuracy required for a VNA to provide reasonable results. You've just got to take a part of the output signal and analyze it to get the required phase information.

The "classic" machines do this by installing a dedicated recevicer for the reference channel. Some VNAs even use this reference channel signal to close the control loop of the generator PLL. Siglent uses a single channel receiver and implement a multiplexing switch at the input in conjunction with two isolating switches (to keep feed-through as low as possible) to couple either the output (Reference) signal or the reflected signal (S11) or the Port2 input signal (S21 or SSA) to the input of the receiver.

When arranging a configuration like that, you've got to be sure that the phase of the generator is stable within the required measurement resolution while the instrument evaluates the "other" channels. That's probably also the reason that the SVA1015X needs quite some time to draw a Smith chart or evaluate the phase / amplitude characteristics of a DUT. For every frequency point of the sweep, it has to analyze the reference signal, then switch to the selected input and analyze that signal, after that maybe (not sure if it's necessary) re-check the reference to make sure the phase is still valid. Compared to what I've seen in Dave's video, my ancient boat anchor 8753C is lightning-fast...  :D

Cheers,
Thomas
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #110 on: July 08, 2018, 06:11:10 am »
Dave, thanks for the teardown, that was quite interesting.

In Dave's video at 19:02, there's a close-up of the Port1 interface shown. Since I didn't quite believe that Siglent got along without a directional coupler for their VNA functionality, I dared to have a closer look, see the attached screenshot. There is a tiny multilayer coupler installed (similar to this one https://www.mouser.de/datasheet/2/400/tdk_02022018_HHM22152A2_ver4_1(Oct.2017)-1284660.pdf), yet highly surprisingly it's not located directly at the port but behind a switch and an impedance matching network / attenuator. I wonder how good the isolation/directivity characteristics of the circuitry are. If you look at the efforts the "big brands" in their boat anchors took some 25+ years ago to achieve really good directivity (see attached photo of an opened-up coupler of a HP 85046B test set, belonging to a 8753C VNA), it's hard to believe that despite all the advances in microcircuitry, manufacturers were able to shrink an assembly that much without sacrificing some quality/performance... I may be wrong, though  ;).


Nice one - I was also looking at that part as the directional coupler/bridge and struggling to find a match for it.

I thought it might be a resistive splitter - which has tiny directivity - but can be corrected for by a factory calibration.
I still think there is a factory cal in there. Which, as long as things are stable, will make the directivity much better than the physical parts can deliver on their own.

The HP stuff has good directivity out of the box, with no factory calibration at all. It is pretty amazing how flat the traces are when you first turn it on.
I guess that back then it would have been considered poor form for a company like HP to put a cheaper component in there and correct for it with a calibration. Also then they would have the issue of where to store it, battery backed ram and all its failings, maintenance over the long term etc.
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #111 on: July 08, 2018, 07:18:53 am »
In contrary to the high bandwidth SSA3000 series, Siglent doesn't use the special Rogers (or equivalent) high frequency PCB material but rather some impedance-controlled FR4.

I noticed that too and I wondered if that is the reason that some of the filters are now built with discrete components?
Keyboard error: Press F1 to continue.
 

Offline Neganur

  • Supporter
  • ****
  • Posts: 1089
  • Country: fi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #112 on: July 08, 2018, 01:13:12 pm »
Yes, in principle you are right. But how does one (the instrument) "know" the phase at the tracking generator output?. After all the mixers, gain blocks and filters, even though in theory it may be possible to calculate it, you can not be sure to even getting close to the accuracy required for a VNA to provide reasonable results. You've just got to take a part of the output signal and analyze it to get the required phase information.

[...]
I don't know how the Siglent in particular does it.

But you don't need to know what the value is at the TG nor do you need to calculate it. All you need to do is to use it as phase reference and compare the incoming signal against it with a circuit that e.g. can give you a voltage that represents the difference in phase.  I would like to believe the receivers in the mentioned HP gear doesn't "know" the phase either, just the difference and due to calibration knows what is 0 degrees (open) and 180 degrees (short).

Also, the reason to use multiple receivers per port is measurement speed (measure incident and reflected signal simultaneously) and the need to use any port as source and receiver. The Siglent does not seem to even sport a simple DUT reversal via a switch matrix (like four SPDT).

As to phase stability, Siglent does not specify it but you can probably measure it yourself and see how much/minute it drifts after a calibration.

If you like, there is an example of a simple 2-port VNA where essentially one port is only used as TG and the other port is only used as receiver: http://www.scottyspectrumanalyzer.us/msaanalysis.html

The phase reference is a 10.7MHz signal that results from mixing the VCO signals of the 1st LO of the receiving channel with the VCO of the TG. Things are PLL'ed using the same reference oscillator. The signal that is used to measure the incoming phase is taken after the 2nd IF (10.7MHz) and passes through a logarithmic detector (has a square wave output). The following phase detector circuit then simply makes a relative phase measurement. Phase resolution is 0.1% or better.


 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #113 on: July 08, 2018, 03:13:52 pm »

As to phase stability, Siglent does not specify it but you can probably measure it yourself and see how much/minute it drifts after a calibration.



Seems to me that the reference in this scheme is going to be the AtoD sample clock.  As long as you sample forward power, reverse power (for S11) and through power (for S21) at the same relative number of sample clocks to each other, then the phase error due to not sampling them at the same time should calibrate out.

So, I see a possible scheme as:

Select forward power for sampling.
Let it settle for Ns sample clocks
Take Nfft samples
Select reverse power for sampling
Let it settle for Ns sample clocks
Take Nfft samples
Select through power for sampling
Let it settle for Ns sample clocks
Take Nfft samples

Do FFTs on each set of samples to determine phase/amplitude at the frequency of interest.

Note that the delay between each set of samples is Ns + Nfft which is a fixed phase error for the frequency of interest.  It's not really different to calibrating at the end of a really long cable between your test port and device under test - the samples representing the reflections from the end of the cable are delayed in time.

So, I don't see the sample clock varying significantly while sampling one frequency (or more likely set of frequencies represented by the FFT).  However, should it drift over time, it would invalidate any stored calibration values... but stored calibration values are always suspect on a VNA anyway.  You should always recalibrate before taking any set of measurements that matter.

As for the cost of the Siglent calibration kit and the fact that it's not included, one cannot complain.  The big VNA manufacturers don't include cal kits and a Keysight "Economy" N connector 6 GHz cal kit will cost you US$ 891.  A Kirkby Microwave kit is currently $584 shipped in the UK!  But you don't need these for 1.5GHz... a lower quality kit at a lower price would be fine for 1.5GHz.

It has to be said that the quality of your measurements depends on the quality of your cal kit.  You can't measure a return loss of 50dB if your load has a return loss of 40dB!  If you do measure 50dB after calibrating with a 40dB load, all you can say is the return loss is 40dB or better, subject to the VNA's measurement uncertainties.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #114 on: July 08, 2018, 03:27:38 pm »

It has to be said that the quality of your measurements depends on the quality of your cal kit.  You can't measure a return loss of 50dB if your load has a return loss of 40dB!  If you do measure 50dB after calibrating with a 40dB load, all you can say is the return loss is 40dB or better, subject to the VNA's measurement uncertainties.

Actually I think that the "quality of your measurements depends on the quality of the characterisation of your cal kit ".
As long as you have good data for your kit, then theoretically the actual standards themselves don't matter much.

Particularly true now that full S param files can be used on a computer, instead of the C0,C1 etc in approximate curve fitting in the VNA.
You can literally use anything as long as you have an S param file for it.


 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #115 on: July 09, 2018, 02:21:25 pm »

It has to be said that the quality of your measurements depends on the quality of your cal kit.  You can't measure a return loss of 50dB if your load has a return loss of 40dB!  If you do measure 50dB after calibrating with a 40dB load, all you can say is the return loss is 40dB or better, subject to the VNA's measurement uncertainties.

Actually I think that the "quality of your measurements depends on the quality of the characterisation of your cal kit ".
As long as you have good data for your kit, then theoretically the actual standards themselves don't matter much.

Particularly true now that full S param files can be used on a computer, instead of the C0,C1 etc in approximate curve fitting in the VNA.
You can literally use anything as long as you have an S param file for it.


Good point.

I'd be pretty sure that Siglent's (relatively cheap) cal kit isn't that well characterized.  I guess we need some more data on it.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #116 on: July 20, 2018, 08:44:21 am »
Pleasingly these come with 128 hours option trial time.
Fan noise is a little different to SSA's and a little higher pitched but otherwise levels are much the same.

Avid Rabid Hobbyist
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #117 on: July 20, 2018, 12:29:46 pm »
Let's see if I can make some of the SVA features work......maybe if I really knew what I was doing.  :-[
No study, no reading of the manual and only stumbled around in the UI to gain some little familiarity ......and watched Daves teardown vid.

Cold turkey antenna improvement exercise.

Background.
Some good few years back after a bit of study I wanted to extend the ~2-300m range of a wireless setup I have to control a 3 phase water pump and I needed 500m range to use the tiny remote from my house.
I built this from stuff I had on hand but in error made the copper monopole for 1/2 wavelength of 433 MHz when actually the system is 315 MHz.  :palm: It has no ground plane only a galv tin roof nearby. ~2m coax to a BNC connector close to the 4ch receiver.
So let's quickly confirm the transmission frequency in SA mode with just a coax RF loop.



Existing copper monopole.

In short, it was bloody useless and the antenna was unplugged and replaced with a ~200mm stainless welding wire that amazingly worked quite well at the full 500m. (tongue stuck out and standing on one leg) Run in this mode for many years.  :phew:

Stainless monopole





Can we improve on it now we have an SVA ?
Select VNA mode.  ???
Let's see how bad the existing is  :scared:

Existing R

Existing SWR

So for 315 MHz the existing 1/2 wave 433 MHz monopole is too short as it needs to be ~475mm so let's try 1/4 wavelength 315 MHz that works out at ~952/4 = 238mm
http://www.onlineconversion.com/frequency_wavelength.htm
Results below, not great but certainly an improvement.

Shortened R

Shortened SWR


So next to reinstall the antenna and see if it works at range........suspect it will need more tweaks yet......... TBC
« Last Edit: July 20, 2018, 07:08:06 pm by tautech »
Avid Rabid Hobbyist
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #118 on: July 20, 2018, 03:16:19 pm »
I'd start with a wider span next time so you can actually see the true resonant frequency. It's always nice to see that "dip" on the screen.
VE7FM
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #119 on: July 20, 2018, 06:32:40 pm »
I'd start with a wider span next time so you can actually see the true resonant frequency. It's always nice to see that "dip" on the screen.
Great idea, thanks.

SWR shortened antenna, image as above.



SWR as above, wider span with marker on frequency of interest.



I'm fairly sure this monopole is gunna need a ground plane to be effective......now to find something around here that's suitable. I might have some shielding mesh somewhere.......
« Last Edit: July 20, 2018, 07:06:40 pm by tautech »
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #120 on: July 20, 2018, 06:49:23 pm »
SWR still looks bad, is this what you are measuring?



If so, that does not look like a DIpole (2-pole) but rather just a 1/4 wave whip, or what should be a quarter wave. A dipole does not need a ground plane (because it has 2 poles already) but this one does. It looks like it is mounted on a metal box, that could be enough for a ground plane. Anyway, looking at the SWR and the picture I think there is some metal behind the antenna isn't it? That is why your SWR sucks, the metal is reflecting the signal back to the antenna.

Keyboard error: Press F1 to continue.
 
The following users thanked this post: tautech

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #121 on: July 20, 2018, 07:06:01 pm »
No, the monopole on the hockey stick.

Monopole, monopole, monopole.......time for some edits.  |O
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #122 on: July 20, 2018, 07:26:45 pm »
No, the monopole on the hockey stick.

So this one?



Do you have a better picture of the actual antenna or is it just a piece of metal sticking upright? Where is the coax shield connected?
You can easily convert it to a groundplane antenna by using 3 or 4 equal length wires connected to the coax shield and pointing down like this:



I still think your SWR sucks…
Keyboard error: Press F1 to continue.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #123 on: July 20, 2018, 07:57:52 pm »
No, the monopole on the hockey stick.

So this one?



Do you have a better picture of the actual antenna or is it just a piece of metal sticking upright? Where is the coax shield connected?
You can easily convert it to a groundplane antenna by using 3 or 4 equal length wires connected to the coax shield and pointing down like this:



I still think your SWR sucks…
Yeah I know, it's shit.

The copper rod is pressed into the turned nylon bush and the coax center connected below.
I'll turn another step on the nylon bush and connect the braid to some mesh that sits on the step.
Not sure what I have for the mesh and that will entail a rummage around in the morning. I have heaps of 1/4" copper rod but setting ground plane 'fingers' up so they'll withstand the weather is troublesome in my mind.
I think it'll be easier with mesh....I'm sure I have some perforated mesh somewhere as I'd rather not use the 3/4" chicken mesh that I've got plenty of.

I made all this years ago and now with a SVA I have the chance to get it right.
The short length of stainless sitting in the BNC socket works so well as the control cabinet provides the ground plane and it still receives transmissions even though it's in a tin shed.  :o The hockey stick monopole is just LOS from where we send the signal from inside the house.

Thanks for the pointers, I'll sleep on them.  :)
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #124 on: July 20, 2018, 08:26:13 pm »
One more thing: the angle of the radial(s) should be about 45o for an impedance of 50 Ohm.
Keyboard error: Press F1 to continue.
 
The following users thanked this post: tautech

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #125 on: July 20, 2018, 08:32:11 pm »
One more thing: the angle of the radial(s) should be about 45o for an impedance of 50 Ohm.
Thanks.
hendorog sent me this link in an email:
http://www.microwavetools.com/monopole/
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #126 on: July 20, 2018, 08:48:06 pm »
I still think calling it a 'monopole' where your second pole is the ground plane is weird, but anyway…
Please keep in mind that the link points to a 2.4Ghz antenna, your ground plane needs to be 10 times bigger to be as effective. Also, it radiates slightly upwards and I don't think you want that? A vertical dipole radiates horizontally.
Keyboard error: Press F1 to continue.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #127 on: July 20, 2018, 08:55:45 pm »
I still think calling it a 'monopole' where your second pole is the ground plane is weird, but anyway…
Please keep in mind that the link points to a 2.4Ghz antenna, your ground plane needs to be 10 times bigger to be as effective. Also, it radiates slightly upwards and I don't think you want that? A vertical dipole radiates horizontally.
Call it a whip then and what's your advice to improve it's performance ?
Go from 1/4 wave to 1/2 or full wavelength ?

1/4" (6.25mm) copper rod is my preferred mast material. 952mm is full wavelength and this copper is reasonably stiff but the only concern is the nylon bush it's mounted in for full wavelength.
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #128 on: July 20, 2018, 09:12:37 pm »
The most basic antenna is an open dipole, which you can mount horizontal or vertical. Horizontal will give you a radiation pattern like the figure 8, vertical will be a circle.
So 2 1/4 wavelength elements mounted on a small isolator, coax conductor to one element and shield to the other. The problem here is to mount it on a pole, you can't tape it to a conducting pole but you should stay clear of conducting materials in the radiating direction for a few wavelengths. If you want to use a vertical dipole on the existing mast I think your best bet would be to put the dipole in a pvc tube and mount that on top of your mast, keeping it at least 20cm away from the top of the mast. The problem here is feeding the coax to the antenna without disturbing the radiation pattern.
So that is why a ground plane antenna is easier, you can simply mount it on top of the mast.



Keyboard error: Press F1 to continue.
 

Offline ironcurtain

  • Regular Contributor
  • *
  • Posts: 55
  • Country: es
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #129 on: July 20, 2018, 10:16:54 pm »
Whoops, I haven't got it shipped yet but I bought a Siglent SSA3021X....

Should I just tell them to ship a Siglent SVA1015X instead? Assuming we get to hack the SVA to expand the frequency range. It seems like a much more complete solution and I could definitely use the VNA options.

Damn!!!!
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #130 on: July 21, 2018, 05:59:30 am »
Whoops, I haven't got it shipped yet but I bought a Siglent SSA3021X....

Should I just tell them to ship a Siglent SVA1015X instead? Assuming we get to hack the SVA to expand the frequency range. It seems like a much more complete solution and I could definitely use the VNA options.

Damn!!!!
SVA1015X is already the top BW model in this range so I'm fairly sure BW can't be improved. Owning both (as demo models) they're aimed at different markets due to their differing capability. If the VNA capabilities are of use and 1.5 GHz is enough to meet your SA BW needs the SVA1015X is the one to go for.
Happy hunting.  :)
Avid Rabid Hobbyist
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #131 on: July 21, 2018, 08:30:18 am »
The most basic antenna is an open dipole, which you can mount horizontal or vertical. Horizontal will give you a radiation pattern like the figure 8, vertical will be a circle.
So 2 1/4 wavelength elements mounted on a small isolator, coax conductor to one element and shield to the other. The problem here is to mount it on a pole, you can't tape it to a conducting pole but you should stay clear of conducting materials in the radiating direction for a few wavelengths. If you want to use a vertical dipole on the existing mast I think your best bet would be to put the dipole in a pvc tube and mount that on top of your mast, keeping it at least 20cm away from the top of the mast. The problem here is feeding the coax to the antenna without disturbing the radiation pattern.
So that is why a ground plane antenna is easier, you can simply mount it on top of the mast.
An issue I have is it needs to receive transmissions from ~130o different directions which is why I originally settled on a monopole/whip that don't have the same directivity constraints.
There's zero transmission requirement as only reception is needed but I do understand that T/R performance is approximately equivalent.
So I'll keep working with/on what I have for now and attempt to add a ground plane.
Thanks for your help.
Avid Rabid Hobbyist
 

Offline G0HZU

  • Super Contributor
  • ***
  • Posts: 2576
  • Country: gb
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #132 on: July 21, 2018, 08:52:40 am »
A basic J-Pole antenna might be the ideal choice here. Easy to make and easy to match and it gives a low angle of (omni) radiation.

It is about 3/4 wavelength long and you can make a skinny version from 300R ribbon feeder (this is the Slim Jim folded dipole version) and hide it inside a hollow plastic tube. So you could replace the hockey stick with a longer plastic tube and put the antenna in the top section and feed the coax up the bottom of the hollow tube.

Note that the J Pole (or the Slim Jim variant) doesn't need a ground plane so this is why it might be a good choice for you here.
« Last Edit: July 21, 2018, 08:59:58 am by G0HZU »
 
The following users thanked this post: tautech

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #133 on: July 21, 2018, 08:58:17 am »
A basic J-Pole antenna might be the ideal choice here. Easy to make and easy to match and it gives a low angle of (omni) radiation.

It is about 3/4 wavelength long but you can make one from 300R ribbon feeder (this is the Slim Jim folded dipole version) and hide it inside a hollow plastic tube. So you could replace the hockey stick with a longer plastic tube and put the antenna in the top section and feed the coax up the bottom of the hollow tube.

Note that the J Pole (or the Slim Jim variant) doesn't need a ground plane so this is why it might be a good choice for you here.
Thanks, yes maybe.
I'll run some numbers through this:
https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/


Edit
First look seems real good for 315 MHz with a leg separation of 21mm and total length of 686mm.
Might just fit inside some 32mm waste pipe with an end cap on the top. 40mm would give a bit more certainty of fitting but at the risk of higher wind loads on the base mount.
Maybe I'll thread the top of the 1/2" galv pipe hockey stick and use 'off the shelf' adapters to fit the waste pipe.....or build it again from 3/4" galv pipe for additional strength as there'll be a bit more windage to deal with as opposed to just a bare element.

Hmmm, off to do some measurements and scavenge though my numerous bits and bobs stashed away.
« Last Edit: July 21, 2018, 09:22:06 am by tautech »
Avid Rabid Hobbyist
 

Offline G0HZU

  • Super Contributor
  • ***
  • Posts: 2576
  • Country: gb
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #134 on: July 21, 2018, 09:23:36 am »
They are easy to make although many people tend to scrimp on the RF connections and end up with something with (soldered) RF connections that will fall apart over time. Also, it's worth fitting something at the antenna feedpoint to choke RF away from the outer of the coax feedline. If it ends up inside a skinny plastic water pipe then you might as well just make the basic J Pole version as there's little/no performance advantage with the folded (Slim Jim) version. They should both radiate as an omni vertical dipole with no need for a ground plane.

I guess the alternative would be to attach ground radials to your existing monopole antenna. I don't think there will be much difference in RF performance between any of these options and it really is a case of which version you prefer to build (and look at). However, if you build it well, the J Pole version inside a plastic pipe should be the most weatherproof... but you do have to make solid connections from the coax to the antenna if you want something you can fit and forget for many years.

You should be able to fit it inside a 18mm or 22mm diameter plastic pipe. 32mm is very wide!
« Last Edit: July 21, 2018, 09:31:32 am by G0HZU »
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #135 on: July 21, 2018, 09:48:50 am »
@tautech, I am enjoying the discussion about antennas, and I see how it is related to a VNA, but it should be more productive to move it to a new thread and keep this thread exclusively for SVA1015X discussions...
 
The following users thanked this post: ironcurtain

Offline bicycleguy

  • Regular Contributor
  • *
  • Posts: 129
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #136 on: July 21, 2018, 11:24:30 am »
@tautech, I am enjoying the discussion about antennas, and I see how it is related to a VNA, but it should be more productive to move it to a new thread and keep this thread exclusively for SVA1015X discussions...
I'm kind of a noob with respect to VNAs and before your post was thinking of commenting what a great idea it was for @tautech, on this sales oriented thread (or his knowledgable posters ^-^) to do this little teaching moment of what the VNA can be used for.  Maybe over time I will learn enough to think I need to buy one :-+
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #137 on: July 21, 2018, 11:50:38 am »
They are easy to make although many people tend to scrimp on the RF connections and end up with something with (soldered) RF connections that will fall apart over time. Also, it's worth fitting something at the antenna feedpoint to choke RF away from the outer of the coax feedline. If it ends up inside a skinny plastic water pipe then you might as well just make the basic J Pole version as there's little/no performance advantage with the folded (Slim Jim) version. They should both radiate as an omni vertical dipole with no need for a ground plane.

I guess the alternative would be to attach ground radials to your existing monopole antenna. I don't think there will be much difference in RF performance between any of these options and it really is a case of which version you prefer to build (and look at). However, if you build it well, the J Pole version inside a plastic pipe should be the most weatherproof... but you do have to make solid connections from the coax to the antenna if you want something you can fit and forget for many years.

You should be able to fit it inside a 18mm or 22mm diameter plastic pipe. 32mm is very wide!
Yes and after enlarging the J type pic I see the gap (F) spec is OD so yes it will fit into something smaller.
'Gap' put me crook thinking it was the gap between elements when it's actually an outside measurement.  :phew:

The feed points I'd experiment with and maybe with two sliding brass custom terminations that can be fixed permanently once the assembly is tuned. I can easy spin something up on the lathe and drill and tap it for termination and retaining screws.

I'm gunna feed it with coax as the run is a couple on meters and I haven't got ribbon cable on hand.
I might change the existing coax to one with a more robust middle conductor that I can sleeve and bootlace terminate.
The braid will be easy to just sleeve and retain the barrel choke in the right position with two cable ties.

I'll be a while before I post anything more on this as obtaining the bits and engineering will need to be factored into any spare time I get.  :(

Yeah, I'm liking the J pole antenna more and more.  :)

@tautech, I am enjoying the discussion about antennas, and I see how it is related to a VNA, but it should be more productive to move it to a new thread and keep this thread exclusively for SVA1015X discussions...
Noted.
I'm kind of a noob with respect to VNAs and before your post was thinking of commenting what a great idea it was for @tautech, on this sales oriented thread (or his knowledgable posters ^-^) to do this little teaching moment of what the VNA can be used for.  Maybe over time I will learn enough to think I need to buy one :-+
:) Yeah it's got a bit out of hand from just a quick attempt to demonstrate how useful these VNA's can be.
If I had one years back........well everything would be remote controlled !

If it wasn't for the highly knowledgeable RF guys maybe it would've been just a single post.
So thank them not me !
Avid Rabid Hobbyist
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #138 on: July 21, 2018, 11:30:25 pm »
Smith Chart looks so cool... @tautech: please post PICTURES of your SVA1015X unit while you experiment with new antennas and the whole tuning process
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #139 on: July 22, 2018, 08:49:51 am »
Smith Chart looks so cool...
Yeah and I'm still learning to use it.
I was originally confused that it had no scaling however after some thought and a first read of the manual it's then obvious you can use the Markers and read the values from them.
An example which shows early preliminary measurements from a new bare J Pole antenna.



Quote
@tautech: please post PICTURES of your SVA1015X unit while you experiment with new antennas and the whole tuning process
It's just a plain ordinary SVA using nothing that any hobbyist doesn't have in their RF box, maybe with the exception of a N-BNC adapter borrowed from my SSA3032X.
Avid Rabid Hobbyist
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #140 on: July 22, 2018, 06:15:04 pm »
I think Tautech exploring the SVA1015X and his antenna is great.
As an example of something closer to what you're aiming for with your antenna here are two shots of a 1/4 whip antenna designed for the 70cm(430-450MHz) ham band, displayed in SWR and on a smith chart.
VE7FM
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #141 on: July 22, 2018, 07:06:21 pm »
I think Tautech exploring the SVA1015X and his antenna is great.
As an example of something closer to what you're aiming for with your antenna here are two shots of a 1/4 whip antenna designed for the 70cm(430-450MHz) ham band, displayed in SWR and on a smith chart.
:)
Thanks, I hope I'm not displaying any excellence as I'm a bit out of my depth but having a pile of fun learning.

hendorog helped me get a heap closer to optimum today when he dropped by to grab the SVA for some hardcore checks against his SH and Agilent. We explored just a small bit of the total functionality and checked his SMA Cal standards against the SVA factory setup. Changed SVA Cal to hendorog's kit and back again to factory default. Easy peasy !
Log Mag mode was something he showed me today and the dip in the sweep frequency where the antenna is the most emissive can be of great assistance for tuning this J Pole. I'll document more about the HW later as it's been changed and simplified. 3.2mm brass welding rod now with custom sliding feed points. (hint; 3.5mm chocolate block inners)
Getting some more antenna project bits tomorrow.  :)
When I get time I'll carry on with just the SSA and an external bridge then park it for a bit until the SVA gets back for final antenna optimization.
Think I'll order some more SVA's.............

hendorog will show just what it's capable of far better than I can.  :(

He left here like a dog with two tails.  :D
Now I'm hoping he'll give it back. :-//
Avid Rabid Hobbyist
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #142 on: July 22, 2018, 07:46:19 pm »
He left here like a dog with two tails.  :D

LOL!
Tails are like antennas right?  ;)
VE7FM
 

Offline G0HZU

  • Super Contributor
  • ***
  • Posts: 2576
  • Country: gb
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #143 on: July 23, 2018, 07:09:33 am »
Quote
An example which shows early preliminary measurements from a new bare J Pole antenna.

Your early plots don't look right to me so I had a go at making a very basic J-Pole at about 315MHz.

I used 2mm diameter copper wire which is a bit thin but I didn't want to waste the thicker stuff. So my antenna is a bit wobbly and needed supports to keep it stable in terms of tuning and alignment. However, see below for an image showing the complex impedance and the S11 plot and VSWR. I didn't bother to trim it for 315MHz so it is showing the best VSWR at 302MHz. I didn't do anything special in terms of optimising the lengths and just went for 3/4 wavelength overall and 1/4 wavelength for the J bit and I did this very casually to something like +/- 10mm. I then optimised the feed point on the VNA for lowest VSWR.

Note that the VNA reference plane is set right at the connection point to the antenna wires so the complex impedance graph is at the far end of the coax as it connects directly to the antenna wires.

Someone with more time on their hands could optimise the various antenna dimensions better than this but the plot below would be good enough for me for a basic J-Pole lashup  at 302MHz :)
« Last Edit: July 23, 2018, 07:13:34 am by G0HZU »
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #144 on: July 23, 2018, 07:38:37 am »
Quote
An example which shows early preliminary measurements from a new bare J Pole antenna.

Your early plots don't look right to me so I had a go at making a very basic J-Pole at about 315MHz.
Yeah they're miles off mostly due to basic newbie mistakes that were explored yesterday with hendorog.
I'm using 1/8" brass now but still in a 32mm PVC tube so I can still go back and build something with the 1/4" copper rod I have lots of.
The 1/8" brass is in just 1m lengths and a trim to the 1/4 wave section (correct calculated length) came up just a few mm short of where it should've been cut.  |O  We proved it was wrong by adding a bit back with a cable strip connector. This where it seems the Log Mag mode seems great for getting onto the target frequency.

The 200mm stainless whip in the BNC socket worked fine again this morning.  :phew:
Thanks for your pointers of help guys.  :)
Avid Rabid Hobbyist
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #145 on: July 23, 2018, 08:11:42 am »
I had a play last night when I got home. I did some unscientific tests of the drift and the directivity.

So far the drift after a cal looks OK. It looks to me like it has around 40dB of 'worst case usable' directivity - I did a calibration straight after power up and then waited an hour or so.

Probably the switched time division sampling of the reference (TG output) and the measurement has something to do with this.

The out of the box directivity with no calibration seems pretty decent too. I'll test this again to make sure I am not being fooled by it saving my last cal as we did set it to restore last settings on power up.

First impressions of the VNA software is that it is basic but stable. There are definitely features that have been held back - i.e. greyed out. These will no doubt come in due course. I wonder if Siglent have intentionally gone with a limited feature set for the early release to ensure stability?

I also had a quick play with the SA features. It is much more feature rich than the VNA side right now and I don't know if I am imagining it but I think there are even more options on the trace math page than the SSA has. The power math looks useful as it can be used, with averaging, to drop the noise floor.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #146 on: July 28, 2018, 02:28:06 pm »
Quote
An example which shows early preliminary measurements from a new bare J Pole antenna.

Your early plots don't look right to me so I had a go at making a very basic J-Pole at about 315MHz.
Some progress.
Using SSA3032X and Siglents RBSSA3X20 reflection bridge just in some effort to get the resonant frequency to close to where it needs to be.

Old whip/monopole.


New J-Pole and 3m RG58 feeder.


No final tuning from VNA SWR or Smith charts until hendorog is finished with the SVA.
Avid Rabid Hobbyist
 

Offline nautiboy

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #147 on: August 05, 2018, 01:06:03 pm »
I received my sva1015 last week and have been having fun getting to know it.  However I'm having a bit of trouble with the analog modulation analysis option and I'm wondering if anyone can provide some help/guidance.  I'm not sure if the issue is with my setup, theory, expectations or some combination thereof. 

I want to be able to do some FM deviation measurements, so I wanted to start by making sure I could get (what I believe to be) the correct values with a controlled setup. 

I've tried several different setups and I'm getting similar results from each of them, so I'll describe just one of the setups.  I have an amateur radio VHF/UHF transceiver connected to a Bird 4431 wattmeter which has an RF sample port.  The output of the bird is connected to a 50Ohm dummy load and the sample port is connected to the SVA1015.  For the modulating signal, I'm using the waveform generator on my SDS2204X scope, connected to the audio line-in on the data port of my transceiver. 

The waveform generator is sending a 1.2kHz sine wave onto a carrier at 144.41Mhz, and I used the spectrum analyzer functionality to adjust the waveform generator's amplitude until I hit the 1st order Bessel null.  This should be a modulation index of 2.4 and thus a frequency deviation of +/- 2.88kHz.  I also double-checked the deviation using the spectrum analyzer via the min/max trace differential and got the expected 2.88kHz deviation.  So I'm pretty sure the signal's FM deviation is indeed 2.88kHz. 

But when I enable the analog FM modulation mode, I can't seem to get it to give me that result.  I've tried every value of IF Bandwidth available, as well as every EqLPF.  I've tried both with and without averaging.  None of the values (min, max or average) are showing a deviation of 2.88kHz.  And the signal on screen is a bit more wonky than I'd expect.  It does sort of, mostly, show what looks like the 1.2kHz signal but it's not clean or consistent at all.  I've tried moving the SVA1015 away from the transceiver and the dummy load in case there was some noise getting into the machine from them, but that didn't seem to have any effect. 

Is there something I'm doing wrong?  Any advice/suggestions? 

BTW - I want to give some kudos to Siglent's support staff.  There were some issues getting my option licenses installed, which was exacerbated by the fact that the analog modulation analysis option was not enabled under trial license.  The tech support stayed late on friday waiting for the corrected codes to send to me so that I could do the work I was expecting to do over the weekend. 

One other side note for anyone looking at using the vector analysis functionality, their calibration kit is back-ordered and won't be available for roughly another week.  So unless you already have an appropriate calibration kit, you won't really be able to use the VA functionality for a little while.   Of course you can play around with it, but you can't *really* use it without proper calibration.


   
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #148 on: August 05, 2018, 01:52:36 pm »
I just tried to replicate your setup quickly with a signal generator - I have to go out now, so didn't have time for screenshots etc.

Things I observed were:
* Level reading 3.4 dB when signal was 0dB. Channel power measurement on SA funciton showed 0dB.
* Not able to get a stable deviation reading in Demod mode for low FM deviation values. Above about 4 kHz I could get a stable reading using averaging, but it was always about 30% below what the signal generator was saying.
* I tried the min/max measurement in SA mode, but I'm not familiar with it and didn't have time to research it. It also read a different value but that is probably my fault.
* The Occupied bandwidth measurement function on the SA closely matched the FM deviation setting on my Sig gen.

I can look into it a bit further for you later on - let me know if there are any other tests I can do.

 
The following users thanked this post: tautech, nautiboy

Offline nautiboy

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #149 on: August 05, 2018, 04:30:51 pm »
Thanks for running the tests.  If it can't give stable values below 4kHz deviation, that certainly limits its functionality (at least for me).  My usage is primarily with transceivers using a max of 5kHz deviation (and it's usually a bit lower than that), and it wouldn't be helpful at all while testing in narrowband mode (2.5kHz deviation). 

But at least with my setup I still can't seem to get any stable results even at roughly 4.5kHz deviation (which is the highest deviation I can get out of my transceiver).  I was able to get a much more stable visual display if I used 4kHz as my modulating frequency, though it's showing a weird component at the start of the trace which I don't believe is part of the signal.  But I'm still not getting stable deviation numbers.  I'll try to get some screenshots in the morning in case that helps diagnose my issue. 
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #150 on: August 05, 2018, 05:35:07 pm »
Strange thing is the MIN deviation shown seems quite repeatable.

When the SG is set to 1.88 kHz FM modulation, the Min value consistently shows 1.3 kHz deviation on the SVA.
When the SG is set to 2.88 kHz FM modulation, the Min value consistently shows 2.0 kHz deviation on the SVA.
When the SG is set to 3.88 kHz FM modulation, the Min value consistently shows 2.7 kHz deviation on the SVA.
When the SG is set to 4.88 kHz FM modulation, the Min value consistently shows 3.4 kHz deviation on the SVA.
When the SG is set to 5.88 kHz FM modulation, the Min value consistently shows 4.1 kHz deviation on the SVA.
When the SG is set to 6.88 kHz FM modulation, the Min value consistently shows 4.8 kHz deviation on the SVA.

I repeated the pattern starting at 1kHz, with 1 kHz steps and it is consistent.

Applying these rules results in a sensible value:
Over 5kHz deviation you can read the average value and divide it by 0.7 to get the correct deviation.
Under 5kHz take the MIN value and divide it by 0.7 to get the correct deviation.

So perhaps you can get the signal going then hit restart measurement and remember the value.

My Signalhound in analog demod mode shows +/- deviation values which are about 1% less than the SG setting, so I'm reasonably confident that the SG is outputting something sensible.
« Last Edit: August 05, 2018, 07:24:53 pm by hendorog »
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #151 on: August 09, 2018, 12:09:07 pm »
New firmware for SVA1015X
V2.1.1.1.12a
https://www.siglentamerica.com/download/6912/
38.8 MB

Changelog
2018/8/8
1. Spectrum Analysis mode:Improved the stability of sweep and interface.
2. VNA mode: fasten the VNA sweep speed; expand the minimum span from 10M to 10 kHz.
3. Modulation Analysis mode: add trigger, optimize the modulation analysis algorithm.
4. Add user port number selection for web server.
« Last Edit: August 15, 2018, 10:52:12 pm by tautech »
Avid Rabid Hobbyist
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #152 on: August 09, 2018, 01:24:12 pm »
When someone gets the actual Siglent cal kit it would be nice to see what S21 phase looks like with both the open and short connected after performing a calibration.
VE7FM
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #153 on: August 09, 2018, 01:46:02 pm »
When someone gets the actual Siglent cal kit it would be nice to see what S21 phase looks like with both the open and short connected after performing a calibration.

Do you mean S11 phase? The S21 phase won't be measuring anything with an open and/or short connected.

Anyway, that can be done now, without waiting for the official cal kit. This is because the Siglent cal kit characterisation data is already installed in the analyzer. So any open short and load will show exactly the same trace as the official cal kit will - as the data pre-set in the analyser defines 'what they are'.

Anything else that you measure will show a different traces if you cal with different kits. But measuring the parts in the kits themselves will show the same traces as they just reflect the cal data in the analyser.
 

Online TheSteve

  • Supporter
  • ****
  • Posts: 2849
  • Country: ca
  • GHz or bust
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #154 on: August 09, 2018, 02:43:42 pm »
When someone gets the actual Siglent cal kit it would be nice to see what S21 phase looks like with both the open and short connected after performing a calibration.

Do you mean S11 phase? The S21 phase won't be measuring anything with an open and/or short connected.

Anyway, that can be done now, without waiting for the official cal kit. This is because the Siglent cal kit characterisation data is already installed in the analyzer. So any open short and load will show exactly the same trace as the official cal kit will - as the data pre-set in the analyser defines 'what they are'.

Anything else that you measure will show a different traces if you cal with different kits. But measuring the parts in the kits themselves will show the same traces as they just reflect the cal data in the analyser.

Yes indeed, S11.

I was just wondering as the results I get with my Kirkby(not quite in spec kit) and a proper Agilent kit are of course different(with the proper defs entered/selected for each). 
« Last Edit: August 09, 2018, 02:47:55 pm by TheSteve »
VE7FM
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #155 on: August 09, 2018, 02:47:30 pm »
When someone gets the actual Siglent cal kit it would be nice to see what S21 phase looks like with both the open and short connected after performing a calibration.

Do you mean S11 phase? The S21 phase won't be measuring anything with an open and/or short connected.

Anyway, that can be done now, without waiting for the official cal kit. This is because the Siglent cal kit characterisation data is already installed in the analyzer. So any open short and load will show exactly the same trace as the official cal kit will - as the data pre-set in the analyser defines 'what they are'.

Anything else that you measure will show a different traces if you cal with different kits. But measuring the parts in the kits themselves will show the same traces as they just reflect the cal data in the analyser.

Yes indeed, S11.

Ok, will do tonight and post some pics.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #156 on: August 09, 2018, 05:19:58 pm »
New firmware for SVA1015X
V2.1.1.1.12
https://www.siglentamerica.com/download/6912/
38.8 MB

Changelog
2018/8/8
1. Spectrum Analysis mode:Improved the stability of sweep and interface.
2. VNA mode: fasten the VNA sweep speed; expand the minimum span from 10M to 10 kHz.
3. Modulation Analysis mode: add trigger, optimize the modulation analysis algorithm.
4. Add user port number selection for web server.

Modulation is working much better. Deviation now works as expected.
Modulation rate also now works. Previously it showed a constant number IIRC.

This pic is with 0dBm input, AF modulation of 500Hz and FM modulation of 2kHz set on my old Marconi 2019A (uncalibrated)

The SA function shows channel power of about 0dBm, whereas the modulation function is showing carrier power of -3.42dBm so am not sure if that is showing an incorrect value or if I am just ignorant on something.

Changing the filter setting definitely makes a difference now.

Well done Siglent, a significant improvement there.



 
The following users thanked this post: tautech

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #157 on: August 09, 2018, 05:34:39 pm »
VNA function is clearly improved as well.
* As noted the sweep speed is about 5X faster. Now about 1 second.
* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.
* There are now three cal kits which can be selected: F503ME, 85032F, 85032B/E
* Modify cal kit is still disabled, and port extensions are also still disabled.
* Trace export is still missing. This is a big feature as it enables many things. It should support CSV and s1p files as a minimum.

All in all this looks much improved. Commendable in such a short time frame.

open, short and load traces for the default cal kit are attached

Edit: fix pics
« Last Edit: August 09, 2018, 05:49:07 pm by hendorog »
 
The following users thanked this post: tautech

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #158 on: August 09, 2018, 05:55:00 pm »
Here is a pic showing the post cal repeatability with 10x averaging turned on

The open is just an open SMA port - so no connector repeatability error.
The short is an SMA short - so that has connector repeatability error.

This is many minutes after calibrating and after several connection cycles for the various screenshots done earlier.

Note that the minimum scale is 1dB/div which needs to be fixed.

 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #159 on: August 09, 2018, 06:03:32 pm »
In summary I think the two big ticket items still missing are:
* Trace export function in CSV and s1p formats.
* Fix the VNA sweep to support frequencies below 10MHz.

I think the VNA function would be really improved by adding those two features. Also it would appeal to a wider audience and so generate more sales.
 
The following users thanked this post: tautech

Offline nautiboy

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #160 on: August 10, 2018, 04:00:24 am »
Thanks for testing and reporting on the update.  I saw it last night and was hoping it would fix the modulation analysis issues described earlier.  I briefly tried to install it, but it failed, possibly because I was trying to install the update over the LAN instead of via USB.  It *seemed* to work initially.  I was able to point it at the proper update file, and it seemed to load it, but then it said the file format was unsupported.  I set that to the side at the time because I had some other tests I needed to get done.   I was going to try the update again some time today after I dug up a USB stick in my pile of stuff. 

Regarding your comments about the "issue" with the VNA not going below 10Mhz ... I thought the specs actually stated that the VNA was only supported from 10Mhz and up.  Is there a particular reason you think this will eventually be "fixed"?   Of course I would love it if it went below 10Mhz, as that would allow usage on the bands below 30m.  I was figuring I'd have to get a return loss bridge so that I could at least do scalar measurements at the lower frequencies.  Which brings me to another question I had, which is whether it's possible to use a return loss bridge and still enable some of the network analysis measurements/calculations (similar to the reflection/vswr option on the SSA3K devices), or if I'd have to do the measurements/calculations by hand the "old fashioned" way?   

Also, I was curious about the EasySpectrum software.  The download page only lists it for the SSA3K devices and not for the SVA.  Does the same software work on the SVA or have they not released it yet for the SVA?

 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #161 on: August 10, 2018, 04:19:57 am »
* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.

When tautech posted the changelog for this update he said "expand the minimum span from 10M to 10 kHz", so that is not minimum frequency unfortunately. I wouldn't keep up your hope too high, it is probably a limitation of the hardware.
Keyboard error: Press F1 to continue.
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #162 on: August 10, 2018, 04:55:01 am »


Quote from: PA0PBZ on Today at 04:19:57 am


>Quote from: hendorog on Yesterday at 05:34:39 pm
* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.



When tautech posted the changelog for this update he said "expand the minimum span from 10M to 10 kHz", so that is not minimum frequency unfortunately. I wouldn't keep up your hope too high, it is probably a limitation of the hardware.



I think the coupler(s) may be the reason for the low er (10MHz) limit.

I am sort of surprised it works at that frequency.

Looks like a decent SA, but I am not really sure about the VNA part.
It misses the Ham market with its lower frequency limit, and misses the professional market with its upper frequency limit.
Its really over priced. Somewhere between free and $200 for the VNA option would seem about right.

Unless they can surprise us, and get the lower VNA frequency limit down to (say) 1.5MHz. The PCB material really limits the upper end.
 

Offline nautiboy

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #163 on: August 10, 2018, 04:57:38 am »
Successfully updated to the latest firmware using the USB. 

Modulation analysis does indeed seem to be fixed (or at least vastly improved).  The totally wonky demodulated signal display is now fixed (I really should've taken a screen capture before updating - the waveform was clearly messed up in very interesting (and physically impossible) ways). I see the correct demodulated waveform now.  And the deviation now appears to be giving the correct result.  Woot!  That makes my life much easier. 

VNA is indeed much faster now.  I do find it a little curious though that the span can be reduced to 10kHz despite that it seems the RBW is fixed at 10kHz (maybe I'm wrong and/or it's just a misleading display - if you go to RBW it shows 10kHz greyed-out) . 
« Last Edit: August 10, 2018, 04:59:46 am by nautiboy »
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #164 on: August 10, 2018, 05:02:21 am »
* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.

When tautech posted the changelog for this update he said "expand the minimum span from 10M to 10 kHz", so that is not minimum frequency unfortunately. I wouldn't keep up your hope too high, it is probably a limitation of the hardware.

Oh yes you guys are both right. I misread that point in the changelog.

 I do hope it isnt a hardware limitation though. I am not sure what the problem is though - as with this architecture any phase sync errors in the plls are cancelled out.

 I havent played with the scalar side yet, I will post a pic of it .
 I will also have try the easy spectrum software.

Sorry typing this on phone, am replying to nautiboy as well.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #165 on: August 10, 2018, 05:08:29 am »
Successfully updated to the latest firmware using the USB. 

Modulation analysis does indeed to be fixed (or at least vastly improved).  The totally wonky demodulated signal display is now fixed (I really should've taken a screen capture before updating - the waveform was clearly messed up in very interesting (and physically impossible) ways). I see the correct demodulated waveform now.  And the deviation now appears to be giving the correct result.  Woot!  That makes my life much easier. 

VNA is indeed much faster now.  I do find it a little curious though that the span can be reduced to 10kHz despite that it seems the RBW is fixed at 10kHz (maybe I'm wrong and/or it's just a misleading display - if you go to RBW it shows 10kHz greyed-out) .
Hoping for some clarity on the minimum BW later today.
We can all see 10 KHz listed in the changelog and based on hendorog's findings with my unit I sent Siglent an email yesterday looking for an answer on this issue.
EDIT
Reply from Siglent.
My misunderstanding, 10 KHz IS new Span, improved from 10 MHz.

* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.

When tautech posted the changelog for this update he said "expand the minimum span from 10M to 10 kHz", so that is not minimum frequency unfortunately. I wouldn't keep up your hope too high, it is probably a limitation of the hardware.

Oh yes you guys are both right. I misread that point in the changelog.

 I do hope it isnt a hardware limitation though. I am not sure what the problem is though - as with this architecture any phase sync errors in the plls are cancelled out.

 I havent played with the scalar side yet, I will post a pic of it .
 I will also have try the easy spectrum software.

Sorry typing this on phone, am replying to nautiboy as well.

Then again why would it even be mentioned in the changelog as something Siglent has addressed ?
I'm hoping that it's just a grammar/translation thing.
« Last Edit: August 11, 2018, 05:37:04 am by tautech »
Avid Rabid Hobbyist
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #166 on: August 10, 2018, 05:44:58 am »


Quote from: PA0PBZ on Today at 04:19:57 am


>Quote from: hendorog on Yesterday at 05:34:39 pm
* Start freq for VNA still seems to be 10MHz minimum. I have tried various things but I don't think that has been resolved with this update.



When tautech posted the changelog for this update he said "expand the minimum span from 10M to 10 kHz", so that is not minimum frequency unfortunately. I wouldn't keep up your hope too high, it is probably a limitation of the hardware.



I think the coupler(s) may be the reason for the low er (10MHz) limit.

I am sort of surprised it works at that frequency.

Looks like a decent SA, but I am not really sure about the VNA part.
It misses the Ham market with its lower frequency limit, and misses the professional market with its upper frequency limit.
Its really over priced. Somewhere between free and $200 for the VNA option would seem about right.

Unless they can surprise us, and get the lower VNA frequency limit down to (say) 1.5MHz. The PCB material really limits the upper end.

Yep, I forget that this has a tiny chip coupler in it. Because it has a factory cal it always looks good, and you never see the directivity of the actual device. There is a little bit of noise creeping in close to 10MHz on those traces I posted yesterday, so you are probably right.

I also thought that it would miss the Ham market, but as nautiboy mentioned there is the scalar option with the tracking gen so it's not so bad.

There is also potential for making a simple external transverter. If they add the ability to export the measurement data from Port #2 then that could be used with PC based calcs to cover the full range.

The upper end is locked in for this device so it wouldn't make sense to use a high frequency PCB material. But there will likely be higher frequency units to come as the base platform is so similar to the SSA.

 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #167 on: August 10, 2018, 05:49:33 am »
Then again why would it even be mentioned in the changelog as something Siglent has addressed ?
I'm hoping that it's just a grammar/translation thing.

I thought they had changed the minimum possible start freq of the sweep - and that is still 10MHz after the update.

But they have actually changed the minimum span in VNA mode - which was 10MHz, and is now changed to 10Khz.

So yeah, that was an oops on my part.

 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #168 on: August 11, 2018, 05:50:16 am »
Mouse, keyboard and auto power ON demo video from Jason (Siglent USA)
~4.30 minutes

https://www.siglentamerica.com/video/sva1015x-touchscreen-mouse-keyboard-and-power-on-line-features/
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #169 on: August 11, 2018, 06:08:21 am »
Mouse, keyboard and auto power ON demo video from Jason (Siglent USA)

So boot on power on, keyboard and mouse... What was he demonstrating, a PC?  ;)
Keyboard error: Press F1 to continue.
 

Offline nautiboy

  • Contributor
  • Posts: 5
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #170 on: August 11, 2018, 09:30:47 am »
Yeah, pretty much a computer.   :)  Not shown in the video, but I love the fact that it's running a VNC server.  I can just point my VNC viewer at it and monitor and control it completely remotely.   You can do something similar by pointing a web browser at its webserver, but I've found I like the native VNC interface better.  I can sit on the couch sipping scotch monitoring and controlling the analyzer up in my office.  Heck, since I can VPN into my network from anywhere, I could be sitting at the beach running tests.  Now why one would actually want to be running spectrum analyzer tests while on the beach, well that's another question, though I ask you whether you'd rather run them in a cramped, hot office or sitting out on the beach.  8)

 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #171 on: August 11, 2018, 05:19:51 pm »
Mouse, keyboard and auto power ON demo video from Jason (Siglent USA)

So boot on power on, keyboard and mouse... What was he demonstrating, a PC?  ;)

Even with my bad english he tell clearly what he demonstrate. You can use mouse and keyboard.

Also perhaps he is accidentally demonstrating something what looks weird or like bug.

Time position 59s - 60s happen something what I can not understand without further info. (Perhaps Jason can tell?)
as can see there is RBW 1MHz and attenuator 20dB (and ref level 0dBm) and trace is around -60dBm what is ok.
Then his hand do "something"
and after then
Same RBW but now attenuator 30dB. look now where is 0dB (left side scale) There need read now reference level 10dB (but there read 1.0dBm - why?)
But then. If you look noise level now, it is around -40dBm. 10dB attenuator step produce noise level 20dB step. It is weird.
First it looks like step is 10dB but if look moved trace position and scale. It have stepped up 20dB.
It looks weird if do not know what happen there what can not see in video. Are there edited some things out from video just in this point or what happen.
I do not have SVA so I can not repeat this...



ETA:

Video screen shots

ETA2:

Finally after more analyzing video  these bit blurry screens it looks like it is ok.
Left scale after change from 20 to 30dB attenuator and small vertical adjust
left scale must be from top to down...   1, -9, -19, -29..... etc.  (not 1, 0, -10, etc...) So there is not bug in left side scale. Also if there is 0 it do not have - sign.
So this was wrong alarm.  |O :palm:
« Last Edit: August 12, 2018, 08:38:17 am by rf-loop »
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #172 on: August 11, 2018, 09:53:30 pm »
rf-loop
What you see is a product of fast touchscreen demonstration with NO clear defined intent. (like some old Dave video of fast turning of knobs)

With such a swipe of a finger up and down the display both Ref and Atten levels can be affected and Jason's actions show this well.
But, when a finger is placed on the sweep waveform and raised or lowered with clear intent only the Ref level will change.
hendorog and I have just explored this issue without any attempt to adjust touchscreen properties from factory default.
Until I explore how user touchscreen settings might affect what you see in Jason's video I cannot call it a bug, only fingers working faster than mind.


Not ideal I know for an SA but a wireless mouse and keyboard works just fine with SVA.

I have my SVA back now but lost my SSA to hendorog .......again.  :scared:
Avid Rabid Hobbyist
 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #173 on: August 12, 2018, 01:07:06 am »
rf-loop
What you see is a product of fast touchscreen demonstration with NO clear defined intent. (like some old Dave video of fast turning of knobs)

With such a swipe of a finger up and down the display both Ref and Atten levels can be affected and Jason's actions show this well.
But, when a finger is placed on the sweep waveform and raised or lowered with clear intent only the Ref level will change.
hendorog and I have just explored this issue without any attempt to adjust touchscreen properties from factory default.
Until I explore how user touchscreen settings might affect what you see in Jason's video I cannot call it a bug, only fingers working faster than mind.


Not ideal I know for an SA but a wireless mouse and keyboard works just fine with SVA.

I have my SVA back now but lost my SSA to hendorog .......again.  :scared:

Yes but what ever user do with his fingers final steady result must not be wrong. Of course dsoing something fast there can be  some errors until  all is updated in screen but this is not like it, this error stay.
Now result is that noise trace is roughly 10dB too high if look left side scale numbers.
As can see. image 2  there is left side scale. 1 , 0, -10, -20, -30, -40*, -50, -60, -70, -80,  -90 
*Noise trace is here (around -40dBm)
Then left top corner there read Ref 1.0 dBm
How it is possible there is left side scale 0dBm to 1dBm one division when setup is 10dB/div. Least this is not ok.
It is wrong without any doubt.


It looks like all is ok IF left side scale is  1 , -9, -19, -29, -39, -49*, -59, -69, -79, -89, -99  (I do not have SVA so I can not look more deep)
ETA:When analyzing a little bit blurry video, pretty sure it is this.

Perhaps it is old FW ???  or is this issue still there?  So this is nice if we know it.

I know Jason is just demonstrating mouse and touch and keyboard. Not testing other things.

But when I look this video first time, immediately I see something what I did not expect with my experience and after then I replay it again and yes, noise level hop 20dB when attenuator change 10dB. 

(later look more carefully and find that if correct left side scale, it is ok)
After then I look left scale and ... oops ... how first top div can be 1dB when scale is 10dB  !

My suspect is that in this FW version what ever he use,  it looks like there is bug in left scale numbering.
It is nice to know if this is repaired in later FW-
« Last Edit: August 12, 2018, 08:44:14 am by rf-loop »
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #174 on: August 12, 2018, 06:43:35 am »
Quote
It looks like all is ok IF left side scale is  1 , -9, -19, -29, -39, -49*, -59, -69, -79, -89, -99

I am going to go out on a limb here and say that it does show these values after the swipe.

I went back to the video and the 0's are more clearly 0's before the adjustment. After the adjustment they don't look as clear and so that makes me think that they are actually 9's.

Image attached shows two numbers. One from after change on the top, and before change on the bottom.
(These aren't from the same position in the grid, I just grabbed two which looked clear.)


I think top value is -19 and bottom value is -10

 

Offline rf-loop

  • Super Contributor
  • ***
  • Posts: 2989
  • Country: fi
  • Starting with DLL21
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #175 on: August 12, 2018, 08:26:27 am »
Quote
It looks like all is ok IF left side scale is  1 , -9, -19, -29, -39, -49*, -59, -69, -79, -89, -99

I am going to go out on a limb here and say that it does show these values after the swipe.

I went back to the video and the 0's are more clearly 0's before the adjustment. After the adjustment they don't look as clear and so that makes me think that they are actually 9's.

Image attached shows two numbers. One from after change on the top, and before change on the bottom.
(These aren't from the same position in the grid, I just grabbed two which looked clear.)


I think top value is -19 and bottom value is -10

I think you are right after also I have taken more screen shots from video and analyzed these.
So, I believe now: wrong alarm.
If practice and theory is not equal it tells that used application of theory  is wrong or the theory itself is wrong.
It is much easier to think an apple fall to the ground than to think that the earth and the apple will begin to move toward each other and collide.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #176 on: August 14, 2018, 07:43:36 pm »
Quote
An example which shows early preliminary measurements from a new bare J Pole antenna.

Your early plots don't look right to me so I had a go at making a very basic J-Pole at about 315MHz.
Some progress.
Using SSA3032X and Siglents RBSSA3X20 reflection bridge just in some effort to get the resonant frequency to close to where it needs to be.

Old whip/monopole.


New J-Pole and 3m RG58 feeder.


No final tuning from VNA SWR or Smith charts until hendorog is finished with the SVA.
Back onto this with the VNA and some quick checks to see where I'm at before any final adjustments.
Using factory Cal.
Screenshots tell all:








« Last Edit: August 14, 2018, 07:45:26 pm by tautech »
Avid Rabid Hobbyist
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #177 on: August 15, 2018, 08:10:36 pm »
I'm pretty happy with this, what do you RF gurus think ?
200 MHz span on 315 MHz
Log Mag


SWR



Smith chart

« Last Edit: August 15, 2018, 08:12:48 pm by tautech »
Avid Rabid Hobbyist
 

Offline xaxaxa

  • Regular Contributor
  • *
  • Posts: 247
  • Country: ca
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #178 on: August 15, 2018, 08:13:29 pm »
I'm pretty happy with this, what do you RF gurus think ?
200 MHz span on 315 MHz

Did you calibrate it?
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #179 on: August 15, 2018, 08:14:58 pm »
I'm pretty happy with this, what do you RF gurus think ?
200 MHz span on 315 MHz

Did you calibrate it?
Running on factory Cal
Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #180 on: August 15, 2018, 09:01:36 pm »
I'm pretty happy with this, what do you RF gurus think ?

I'd say well done, next project!  :-+
Keyboard error: Press F1 to continue.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #181 on: August 15, 2018, 09:16:06 pm »
I'm pretty happy with this, what do you RF gurus think ?

I'd say well done, next project!  :-+
Thanks.
For those 'playing along at home', here's the only screenshot that shows some change in results after a 'bush' Cal done at frequency of interest and with a cheap 50 ohm BNC terminator and a homemade short.
Still pretty close but maybe just a little tweak of the feed point will get the impedance back to 50 ohms.

Avid Rabid Hobbyist
 

Online PA0PBZ

  • Super Contributor
  • ***
  • Posts: 3903
  • Country: nl
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #182 on: August 15, 2018, 09:34:43 pm »
Still pretty close but maybe just a little tweak of the feed point will get the impedance back to 50 ohms.

Don't touch it, it will not make a noticeable difference.
Keyboard error: Press F1 to continue.
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #183 on: August 16, 2018, 02:26:32 am »
I don't think you are going to do much better as far as resonance and impedance matching go.
Now you need to move on to modeling the antenna to determine its gain/radiation pattern to ensure that all the energy is going the way you want it to, and not straight up in the air.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #184 on: August 16, 2018, 03:47:10 pm »
I don't think you are going to do much better as far as resonance and impedance matching go.
Now you need to move on to modeling the antenna to determine its gain/radiation pattern to ensure that all the energy is going the way you want it to, and not straight up in the air.
hendorog did that for me a week or so back and @~3m above ground this is what he got:



The J-Pole is installed now and needed some tweaks once mounted and inside the PVC tube.
Long range performance is now much improved and I'll post some pics showing it all to wind up this fun little exercise.
Thanks to all for the help and guidance.
Avid Rabid Hobbyist
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #185 on: August 18, 2018, 02:22:29 pm »
Avid Rabid Hobbyist
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #186 on: August 19, 2018, 11:28:06 am »
There is a bit of disagreement between the User Manual and the Datasheet.

The User Manual, on the subject of the tracking generator says:

For example, if the sweep is set to scan from 1 MHz to 10 MHz, the TG output frequency will change from 1 MHz to 10 MHz in coordinated steps with the sweep.

However, the Datasheet says:

Tracking Generator
Frequency range 5 MHz~1.5 GHz

Can someone confirm that the lowest frequency for the tracking generator is really 5MHz?
I can't see any good reason to limit it like that.
« Last Edit: August 19, 2018, 12:31:49 pm by PhilipPeake »
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #187 on: August 19, 2018, 01:21:54 pm »
Here's some real measurements, TG into input, TG ON, SA mode, direct connection with N-N cable.

« Last Edit: August 19, 2018, 01:23:39 pm by tautech »
Avid Rabid Hobbyist
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #188 on: August 19, 2018, 02:28:36 pm »
Here's some real measurements, TG into input, TG ON, SA mode, direct connection with N-N cable.



So it looks like the data sheet is wrong. I thought it might be.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #189 on: August 19, 2018, 06:23:27 pm »
So it looks like the data sheet is wrong. I thought it might be.
Yes it is wrong.

However deeper investigation reveals the datasheet error is most likely a typo. See reply #194



One can see where I've placed markers the guaranteed TG +3dB flatness is from 500 KHz (0.5 MHz) (marker #4). Marker #3 can be seen to be a little over 3dB down and I've placed it directly on a small red + (not caught/visible in screenshot) present on the sweep that apparently marks the start of the guaranteed sweep specification.

Problem solved in my mind, TG spec = 500 KHz -1.5 GHz.
I'll drop Siglent a memo to correct the datasheet.

See reply #194
« Last Edit: August 21, 2018, 02:23:30 pm by tautech »
Avid Rabid Hobbyist
 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #190 on: August 20, 2018, 02:29:25 am »
What does the trace look like with the TG turned off?

In general for SAs, there isn't much point in putting a marker at 0Hz - you'll just get the LO bleed through which will show at an amplitude of its real value plus whatever attenuation is in use.  In fact, you don't want to look closer to 0Hz than beyond the skirt of the RBW filter in use.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #191 on: August 20, 2018, 08:14:49 am »
What does the trace look like with the TG turned off?

In general for SAs, there isn't much point in putting a marker at 0Hz - you'll just get the LO bleed through which will show at an amplitude of its real value plus whatever attenuation is in use.  In fact, you don't want to look closer to 0Hz than beyond the skirt of the RBW filter in use.
Gotcha, thanks.
As requested:
Same settings as above excepting TG OFF and 0Hz marker removed. Open input.

Avid Rabid Hobbyist
 

Offline orin

  • Frequent Contributor
  • **
  • Posts: 425
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #192 on: August 20, 2018, 02:05:31 pm »
What does the trace look like with the TG turned off?

In general for SAs, there isn't much point in putting a marker at 0Hz - you'll just get the LO bleed through which will show at an amplitude of its real value plus whatever attenuation is in use.  In fact, you don't want to look closer to 0Hz than beyond the skirt of the RBW filter in use.
Gotcha, thanks.
As requested:
Same settings as above excepting TG OFF and 0Hz marker removed. Open input.




You can get closer to 0Hz with a smaller RBW, but it doesn't look worthwhile for this purpose.  TG output seems to be getting down in the noise at around 25kHz.

The contention that the TG spec should be from 500kHz seems right to me.

You could probably use it down to 100kHz or so, but with the TG output at -15dBm and the noise at -50dBm, there's not going to be much dynamic range.
 

Offline janekivi

  • Frequent Contributor
  • **
  • Posts: 358
  • Country: ee
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #193 on: August 20, 2018, 07:15:09 pm »
New firmware for SVA1015X
V2.1.1.1.12a
https://www.siglentamerica.com/download/6912/
38.8 MB

Opportunity to change root password in shadow file in rootfs.cramfs in ADS file... what a mess...
But I skip at this time. Password hash is the same as in SSA3000X firmware. So ding1234 it must be.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #194 on: August 21, 2018, 01:53:02 pm »
What does the trace look like with the TG turned off?

In general for SAs, there isn't much point in putting a marker at 0Hz - you'll just get the LO bleed through which will show at an amplitude of its real value plus whatever attenuation is in use.  In fact, you don't want to look closer to 0Hz than beyond the skirt of the RBW filter in use.
Gotcha, thanks.
As requested:
Same settings as above excepting TG OFF and 0Hz marker removed. Open input.




You can get closer to 0Hz with a smaller RBW, but it doesn't look worthwhile for this purpose.  TG output seems to be getting down in the noise at around 25kHz.

The contention that the TG spec should be from 500kHz seems right to me.


You could probably use it down to 100kHz or so, but with the TG output at -15dBm and the noise at -50dBm, there's not going to be much dynamic range.
Siglent insist the datasheet TG spec of 5 MHz to 1.5 GHz is correct and they add this comment:
The frequency from 5MHz to 1.5GHz meets the specification of datasheet and the 9KHz to 5MHz (range) can not guarantee compliance with datasheet but it can be outputed. 

Quote
You could probably use it down to 100kHz or so, but with the TG output at -15dBm and the noise at -50dBm, there's not going to be much dynamic range.
As above it seems Normalize can compensate right down to ~9 KHz, with provisos of course.
Settings affect the full dynamic range where above screenshots were taken with a Pos Peak detection the range can be improved some using Average and an RBW down to 1 KHz without entering into inconveniently long sweep times.

Avid Rabid Hobbyist
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #195 on: August 22, 2018, 01:41:40 am »
If the Datasheet is correct, then the User Manual example needs to be corrected.

There is a lot misleading advertising around this product it seems.
Its advertised as an SA/VNA from 9kHz to 1.5GHz.

Except that ... its not a VNA unless you pay 50% more.
The VNA doesn't go down to anywhere near 9kHz, off by an order of magnitude
and the TG which is really a pretty important component of the SA only goes down to 5MHz.

I was saving my pennies to buy one, but I am becoming less and less enthusiastic.

« Last Edit: August 22, 2018, 03:03:05 am by PhilipPeake »
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #196 on: August 22, 2018, 06:24:34 am »
New firmware for SVA1015X
V2.1.1.1.12a
https://www.siglentamerica.com/download/6912/
38.8 MB

Opportunity to change root password in shadow file in rootfs.cramfs in ADS file... what a mess...
But I skip at this time. Password hash is the same as in SSA3000X firmware. So ding1234 it must be.

I have been running john the ripper against the PW from the SDG2042X for 36 days solid now - at 214,000 tests per second.
That one is obviously either a tougher nut to crack, or they put random garbage in the shadow file ... always a possibility.

From my limited poking around, I think they are going to be in deep trouble if Ding ever decides to leave.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #197 on: August 22, 2018, 06:47:23 am »
If the Datasheet is correct, then the User Manual example needs to be corrected.

There is a lot misleading advertising around this product it seems.
Its advertised as an SA/VNA from 9kHz to 1.5GHz.
The VNA doesn't go down to anywhere near 9kHz, off by an order of magnitude
and the TG which is really a pretty important component of the SA only goes down to 5MHz.
Which it is.
In SA mode when it is practice to Normalize, any sweep amplitude flatness error is corrected for. This is what Normalize does. The datasheet spec is for guaranteed TG flatness.

Quote
Except that ... its not a VNA unless you pay 50% more.
Mine's fully optioned and it didn't cost a cent.  :-X

Quote
I was saving my pennies to buy one, but I am becoming less and less enthusiastic.
Touch base with the guys in Ohio and see if a demo unit is available.
Avid Rabid Hobbyist
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #198 on: August 22, 2018, 07:04:34 am »
Quote
Except that ... its not a VNA unless you pay 50% more.
Mine's fully optioned and it didn't cost a cent.  :-X
What do you mean?  Siglent is including all options at the base price?
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #199 on: August 22, 2018, 07:13:21 am »
Quote
Except that ... its not a VNA unless you pay 50% more.
Mine's fully optioned and it didn't cost a cent.  :-X
What do you mean?  Siglent is including all options at the base price?
No.
No further comment !  :-X
Avid Rabid Hobbyist
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #200 on: August 22, 2018, 07:15:28 am »
Quote
Except that ... its not a VNA unless you pay 50% more.
Mine's fully optioned and it didn't cost a cent.  :-X
What do you mean?  Siglent is including all options at the base price?
No.
No further comment !  :-X
Let me guess... a promotion is coming... :popcorn:
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #201 on: August 22, 2018, 07:19:55 am »
Quote
Except that ... its not a VNA unless you pay 50% more.
Mine's fully optioned and it didn't cost a cent.  :-X
What do you mean?  Siglent is including all options at the base price?
No.
No further comment !  :-X
Let me guess... a promotion is coming... :popcorn:
Not apparently:
https://store.siglentamerica.com/product/sva1015x/

None I've been advised about.
Avid Rabid Hobbyist
 

Offline BillB

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #202 on: August 22, 2018, 07:34:17 am »
 :-DD   TK perhaps it's time you ask the audience or phone a friend for this one?

Seriously,  I believe that Janekivi's post down the page might shed light on this.  Options on many of the Siglent devices are easily liberated through root access.  I'm guessing that the SVA1015X is no exception.  :) 
 
The following users thanked this post: tautech

Offline BillB

  • Frequent Contributor
  • **
  • Posts: 455
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #203 on: August 22, 2018, 07:37:10 am »
...From my limited poking around, I think they are going to be in deep trouble if Ding ever decides to leave.

Three cheers for Ding!
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #204 on: August 22, 2018, 07:43:11 am »
:-DD   TK perhaps it's time you ask the audience or phone a friend for this one?

Seriously,  I believe that Janekivi's post down the page might shed light on this.  Options on many of the Siglent devices are easily liberated through root access.  I'm guessing that the SVA1015X is no exception.  :)

Working for a reseller, which I think tautech does, I would expect them to have at least one demo/test unit with full options turned on.
So he might also have also mentioned that "his" didn't cost him a penny :-)
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #205 on: August 22, 2018, 08:14:33 am »
:-DD   TK perhaps it's time you ask the audience or phone a friend for this one?

Seriously,  I believe that Janekivi's post down the page might shed light on this.  Options on many of the Siglent devices are easily liberated through root access.  I'm guessing that the SVA1015X is no exception.  :)

Working for a reseller, which I think tautech does, I would expect them to have at least one demo/test unit with full options turned on.
So he might also have also mentioned that "his" didn't cost him a penny :-)
Errr, no unfortunately not.  :(
Any options I want from Siglent I must shell out $ but at least I get them under retail.

See post #119.
Avid Rabid Hobbyist
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #206 on: August 23, 2018, 02:30:34 am »
:-DD   TK perhaps it's time you ask the audience or phone a friend for this one?

Seriously,  I believe that Janekivi's post down the page might shed light on this.  Options on many of the Siglent devices are easily liberated through root access.  I'm guessing that the SVA1015X is no exception.  :)

Working for a reseller, which I think tautech does, I would expect them to have at least one demo/test unit with full options turned on.
So he might also have also mentioned that "his" didn't cost him a penny :-)
Errr, no unfortunately not.  :(
Any options I want from Siglent I must shell out $ but at least I get them under retail.

See post #119.

Really? I would have expected a deeper discount for kit dedicated to demos and providing support to your (and their) customers.
 

Offline allenc

  • Newbie
  • Posts: 3
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #207 on: September 09, 2018, 10:07:16 am »
First post on eevblog.  Hate to start off on a down note but I came into some disposable funds and was looking hard at the SVA1015X when I came across this: https://groups.io/g/svna/message/78

Quote
VNA function has a 10MHz lower limit. Presumably this is due to the chip coupler, but rules out 40m and below for VNA.

The SVA1015X datasheet corroborates this: VNA frequency range is 10 MHz~1.5 GHz.

No VNA operation below 10 MHz?  I'm sorry but that is a major fail in my book.  As a ham and electronics hobbyist I'm looking to characterize filters, baluns, chokes and other devices at HF frequencies below 10 Mhz.  I realize that professional engineers today spend most of their time at frequencies several orders of magnitude higher, but even so they still deal with intermediate stages that are below 10 MHz.

Anyhow, that limit wasn't mentioned in Dave's excellent teardown/review and I didn't spot it in this thread so I thought I'd share it.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #208 on: September 09, 2018, 10:34:36 am »
First post on eevblog.  Hate to start off on a down note but I came into some disposable funds and was looking hard at the SVA1015X when I came across this: https://groups.io/g/svna/message/78

Quote
VNA function has a 10MHz lower limit. Presumably this is due to the chip coupler, but rules out 40m and below for VNA.

The SVA1015X datasheet corroborates this: VNA frequency range is 10 MHz~1.5 GHz.

No VNA operation below 10 MHz?  I'm sorry but that is a major fail in my book.  As a ham and electronics hobbyist I'm looking to characterize filters, baluns, chokes and other devices at HF frequencies below 10 Mhz.  I realize that professional engineers today spend most of their time at frequencies several orders of magnitude higher, but even so they still deal with intermediate stages that are below 10 MHz.

Anyhow, that limit wasn't mentioned in Dave's excellent teardown/review and I didn't spot it in this thread so I thought I'd share it.
Welcome to the forum.

If you hadn't realized, that link and post was from our member hendorog that had my SVA1015X for a while for checks against his HP gear. We expect some more improvements to SVA however from replies I'd had from Siglent, no changes to datasheet specification.
One must be somewhat careful deciphering the datasheet for these as specs listed are for guaranteed accurate performance when the equipment can indeed operate outside those specs but with lesser accuracy.
Avid Rabid Hobbyist
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #209 on: September 09, 2018, 11:36:28 am »
First post on eevblog.  Hate to start off on a down note but I came into some disposable funds and was looking hard at the SVA1015X when I came across this: https://groups.io/g/svna/message/78

Quote
VNA function has a 10MHz lower limit. Presumably this is due to the chip coupler, but rules out 40m and below for VNA.

The SVA1015X datasheet corroborates this: VNA frequency range is 10 MHz~1.5 GHz.

No VNA operation below 10 MHz?  I'm sorry but that is a major fail in my book.  As a ham and electronics hobbyist I'm looking to characterize filters, baluns, chokes and other devices at HF frequencies below 10 Mhz.  I realize that professional engineers today spend most of their time at frequencies several orders of magnitude higher, but even so they still deal with intermediate stages that are below 10 MHz.

Anyhow, that limit wasn't mentioned in Dave's excellent teardown/review and I didn't spot it in this thread so I thought I'd share it.


Yep thats me.

That limitation is mentioned and discussed here. I initially assumed that it was just a first release software limitation which would be removed. Then someone correctly pointed out that it was likely due to the lower frequency limit of the coupler.

This might not be as big of an issue if and when the software is enhanced to support S parameter exporting to a PC. Then an external coupler and a couple of mixers could be used to create a simple transverter to cover that range. Possibly the SVA reference could be used as an LO for the transverter.

The other software enhancement which would make this simpler is an OSL calibration type on port #2 instead of just on port 1.

For the adventurous it could be done without the software enhancements, by feeding the transverter output back into port 1 via a second directional coupler.

I have played with this approach on a different device as a way of converting any spectrum analyzer into a VNA.
The SA input will always have some (unwanted) LO coming out, and so the idea is to take that unwanted LO, convert it in frequency so that it matches the input of the SA, amplify it and then bounce it off a DUT. Then feed it back into the input of the SA again. The downside for an SA is that there is no reference channel, unless a solid state switch is also added. The SVA has the switch and reference channel already.

Not an out of the box solution, but it is possible.

 

Offline xaxaxa

  • Regular Contributor
  • *
  • Posts: 247
  • Country: ca
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #210 on: September 10, 2018, 02:47:34 pm »

No VNA operation below 10 MHz?  I'm sorry but that is a major fail in my book.  As a ham and electronics hobbyist I'm looking to characterize filters, baluns, chokes and other devices at HF frequencies below 10 Mhz.  I realize that professional engineers today spend most of their time at frequencies several orders of magnitude higher, but even so they still deal with intermediate stages that are below 10 MHz.

To be fair it's difficult to make a coupler that can work all the way from LF to UHF; you basically need a balun that covers that frequency range and preserves balun action.

This might not be as big of an issue if and when the software is enhanced to support S parameter exporting to a PC. Then an external coupler and a couple of mixers could be used to create a simple transverter to cover that range. Possibly the SVA reference could be used as an LO for the transverter.

The other software enhancement which would make this simpler is an OSL calibration type on port #2 instead of just on port 1.

For the adventurous it could be done without the software enhancements, by feeding the transverter output back into port 1 via a second directional coupler.

I have played with this approach on a different device as a way of converting any spectrum analyzer into a VNA.
The SA input will always have some (unwanted) LO coming out, and so the idea is to take that unwanted LO, convert it in frequency so that it matches the input of the SA, amplify it and then bounce it off a DUT. Then feed it back into the input of the SA again. The downside for an SA is that there is no reference channel, unless a solid state switch is also added. The SVA has the switch and reference channel already.

Not an out of the box solution, but it is possible.

I wouldn't bother because the accuracy will be spotty at best; keep in mind any phase drift introduced in the signal path will screw up the measurements, which is why in a proper VNA there is always a reference path. In my experience of designing VNAs the reference path must be identical to the reflected path and any mixing stages must be driven from the same LO for both paths (even two LO signals phase locked to the same clock isn't good enough), so having a transverter on the reflected path but not the reference path will really fuck up the measurements.

I don't think it's worth bothering trying to hack this because you can very easily build a much cheaper VNA that will actually be accurate; I can imagine for HF to VHF just some cheap clock gen chips plus a coupler using a cheap surface mount balun, mixers, and a stm32 with audio ADC will do fairly well. Actually that might be a good product idea.

Also I don't think any of the low cost VNAs can do SOL calibration on port 2, because they are all of the T/R type, meaning only port 1 has signal output capability. Designing a full two port VNA (and one with good port-to-port isolation) is HARD; not only do you have to have a port switch with 100dB isolation, you also have think about things like the RF signal leaking into the LO via the receive mixer and then into the other port's receiver mixer (you can't use two different LO synthesizers for the two ports for the aforementioned reasons). And to lay out everything on a board while keeping good isolation between the sig gen and the two ports, between the sig gen and the LO, between the two receivers, while keeping in mind the LO signal has to be routed to the two receivers. Only after almost a year of development did I manage to get all the details right and build a full two-port VNA with reasonable performance.
« Last Edit: September 10, 2018, 03:16:35 pm by xaxaxa »
 

Offline hendorog

  • Super Contributor
  • ***
  • Posts: 1301
  • Country: nz
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #211 on: September 10, 2018, 04:23:49 pm »

No VNA operation below 10 MHz?  I'm sorry but that is a major fail in my book.  As a ham and electronics hobbyist I'm looking to characterize filters, baluns, chokes and other devices at HF frequencies below 10 Mhz.  I realize that professional engineers today spend most of their time at frequencies several orders of magnitude higher, but even so they still deal with intermediate stages that are below 10 MHz.

To be fair it's difficult to make a coupler that can work all the way from LF to UHF; you basically need a balun that covers that frequency range and preserves balun action.

This might not be as big of an issue if and when the software is enhanced to support S parameter exporting to a PC. Then an external coupler and a couple of mixers could be used to create a simple transverter to cover that range. Possibly the SVA reference could be used as an LO for the transverter.

The other software enhancement which would make this simpler is an OSL calibration type on port #2 instead of just on port 1.

For the adventurous it could be done without the software enhancements, by feeding the transverter output back into port 1 via a second directional coupler.

I have played with this approach on a different device as a way of converting any spectrum analyzer into a VNA.
The SA input will always have some (unwanted) LO coming out, and so the idea is to take that unwanted LO, convert it in frequency so that it matches the input of the SA, amplify it and then bounce it off a DUT. Then feed it back into the input of the SA again. The downside for an SA is that there is no reference channel, unless a solid state switch is also added. The SVA has the switch and reference channel already.

Not an out of the box solution, but it is possible.

I wouldn't bother because the accuracy will be spotty at best; keep in mind any phase drift introduced in the signal path will screw up the measurements, which is why in a proper VNA there is always a reference path. In my experience of designing VNAs the reference path must be identical to the reflected path and any mixing stages must be driven from the same LO for both paths (even two LO signals phase locked to the same clock isn't good enough), so having a transverter on the reflected path but not the reference path will really fuck up the measurements.

I don't think it's worth bothering trying to hack this because you can very easily build a much cheaper VNA that will actually be accurate; I can imagine for HF to VHF just some cheap clock gen chips plus a coupler using a cheap surface mount balun, mixers, and a stm32 with audio ADC will do fairly well. Actually that might be a good product idea.

Also I don't think any of the low cost VNAs can do SOL calibration on port 2, because they are all of the T/R type, meaning only port 1 has signal output capability. Designing a full two port VNA (and one with good port-to-port isolation) is HARD; not only do you have to have a port switch with 100dB isolation, you also have think about things like the RF signal leaking into the LO via the receive mixer and then into the other port's receiver mixer (you can't use two different LO synthesizers for the two ports for the aforementioned reasons). And to lay out everything on a board while keeping good isolation between the sig gen and the two ports, between the sig gen and the LO, between the two receivers, while keeping in mind the LO signal has to be routed to the two receivers. Only after almost a year of development did I manage to get all the details right and build a full two-port VNA with reasonable performance.


The 10MHz for the transverter can be taken from the reference output on the back of the SVA. No phase issues with that as its driving the LO already.
But I think you are correct, there will likely be an accuracy hit from amplitude differences between the reference path and the signal path. I'm don't know what the extent of that would be.

Port 2 of the SVA has an even more direct signal path to the ADC than Port 1 does. So with software support it would be quite possible to use that input in a cal or measurement same as Port 1 can.
Port 2 lacks a coupler obviously, we need an external coupler to get below 10MHz anyway.

I'm not talking about 100dB isolation here. Its just a simple cost effective way to make measurements below 10 MHz on an instrument which has this limitation.

Here is one for the N2PK for measuring higher frequencies. Its not rocket salad.
http://www.makarov.ca/vna_transverter.htm

Might have to do some experimentation with this...

 

Offline MrW0lf

  • Frequent Contributor
  • **
  • Posts: 921
  • Country: ee
    • lab!fyi
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #212 on: September 22, 2018, 06:53:28 pm »
 

Offline Wolfgang

  • Super Contributor
  • ***
  • Posts: 1098
  • Country: de
  • Its great if it finally works !
    • Electronic Projects for Fun
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #213 on: September 23, 2018, 10:04:18 pm »
Agreed, for amateur use an LF limit of 10MHz does not make any sense.
When you look at other VNAs, the lower limit is normally around 100kHz (with bias tees) or close to 10kHz (without).
When you look at the VNAs from DG8SAQ or NP2PK its possible without major effort.
The record holder is a Keysight E5061B with a lower limit of 5Hz (also definitely without a coupler).
Why did Siglent do it this funny way ?
 

Offline bson

  • Supporter
  • ****
  • Posts: 1495
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #214 on: September 24, 2018, 05:02:25 pm »
You need a coupler for the reflection measurements, and you need a reference for the reflection measurements to be complex, or they can't be used to calculate input and output impedances - which is a major reason to have a VNA in the first place.

In other words, given Z=Z0*(1+S11)/(1-S11) for a reference impedance Z0 (e.g 50Ω), if you use |S11| instead of S11 you get Z0*VSWR, not impedance.  If you plot the two curves for S11 = [0+0j, 1+1j], you get two very different results:



(Z0=50Ω; real on X axis, imaginary on Y axis; |Z| from complex S11 on the left, using |S11| on the right.)

 

Offline ct1bxt

  • Contributor
  • Posts: 15
  • Country: pt
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #215 on: September 25, 2018, 11:59:04 am »
Hi,

I want to buy one, but probably is a good idea wait for some improvements.
One of those will be the lower frequency of VNA .

Regards
Rodrigo
 

Online TK

  • Super Contributor
  • ***
  • Posts: 1007
  • Country: us
  • I am a Systems Analyst who plays with Electronics
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #216 on: September 25, 2018, 08:33:00 pm »
I don't see too much interest on this forum or any marketing effort (except for Tautech posting a project where He uses it) about this instrument like the Siglent Spectrum Analyzer, DSO, etc.  I see a high risk of this instrument being left undeveloped any further by Siglent and even discontinued.  Please, anyone with connection to Siglent, correct me if I am wrong.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #217 on: September 25, 2018, 08:41:27 pm »
I don't see too much interest on this forum or any marketing effort (except for Tautech posting a project where He uses it) about this instrument like the Siglent Spectrum Analyzer, DSO, etc.  I see a high risk of this instrument being left undeveloped any further by Siglent and even discontinued.  Please, anyone with connection to Siglent, correct me if I am wrong.
Considering they're only been out for 2 months  :-//
Prospective customers are still finding out about them and their capabilities.......give it time.....this instrument fits a niche market of those that don't need a high BW SA and for which the VNA can be useful too.

BTW, for US buyers the Siglent shop has one on special:
https://store.siglentamerica.com/product/sva1015x-demo-returned-unit-includes-vna-option/


« Last Edit: September 25, 2018, 08:47:57 pm by tautech »
Avid Rabid Hobbyist
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #218 on: October 14, 2018, 12:26:49 pm »
Getting a frustrating OZ made Merlin garage door remote back to correct 339 MHz frequency. RF coax loop sniffer used.
Luckily it has a cap trimmer to do so but this remote unit is so old now the trimmer had to go for a swim in IPA before it would behave properly.  :phew:

Avid Rabid Hobbyist
 

Offline LapTop006

  • Supporter
  • ****
  • Posts: 421
  • Country: au
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #219 on: October 15, 2018, 01:04:34 am »
Getting a frustrating OZ made ... so old now the trimmer had to go for a swim in IPA before it would behave properly.  :phew:

Yep, that sounds Australian.
 

Offline PhilipPeake

  • Contributor
  • Posts: 45
  • Country: us
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #220 on: October 15, 2018, 03:18:40 am »
I am pretty much convinced that the lower frequency limit in VNA mode is due to the directional coupler design. As I mentioned before, I am somewhat amazed that it actually works down to that frequency.

I don’t foresee any change other than a redesign, and probably significantly increased price to “fix” this.

If you want to roll your own directional coupler for lower frequencies, you could use it in SA mode and use the tracking generator. It isn’t a VNA when used like this, but for checking antenna SWR and filter frequency response it should be good enough for most ham purposes.

I bought one. It only arrived last week, so I haven’t had time to really play, but I did use the VNA to look at how my old 2m/70cm antenna is working (well, apparently). SWR and Smith chart views were good.

Also switched to SA with the antenna connected as input, restricted to 144 to 148 MHz and watched the signals appearing and disappearing. Better display of this than I get on my radio ... but so I would expect.

I was a little dissapointed at the low end coverage, but if you want a combined sa/VNA and all the other options going up to 1.5GHz, it is going to cost a lot more.

My biggest gripe is the cost of the options, and just how much of the functionality is an option.
 
The following users thanked this post: tautech

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #221 on: October 28, 2018, 09:24:01 am »
Useful basic reference document for VNA usage:
http://literature.cdn.keysight.com/litweb/pdf/5965-7917E.pdf
Avid Rabid Hobbyist
 
The following users thanked this post: nugglix

Offline ct1bxt

  • Contributor
  • Posts: 15
  • Country: pt
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #222 on: December 24, 2018, 02:28:30 pm »
Hi,

any update in TG and VNA low frequency ?
After such issues with the VNA and TG low frequencies, I´m asking my self if is better to go for to SSA3021 instead.
I lost the VNA function but the TG is much better.
Any ideas about that ?
Regards
Rodrigo
 
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #223 on: December 24, 2018, 07:11:12 pm »
Hi,

any update in TG and VNA low frequency ?
After such issues with the VNA and TG low frequencies, I´m asking my self if is better to go for to SSA3021 instead.
I lost the VNA function but the TG is much better.
Any ideas about that ?
Regards
Rodrigo
 
The data sheet specs are what they are unfortunately but a SVA3kX model is coming.

Some addition of options can be had if you study here:
https://www.eevblog.com/forum/testgear/siglent-ads-firmware-file-format/msg1364981/#msg1364981
Avid Rabid Hobbyist
 
The following users thanked this post: ct1bxt

Offline ct1bxt

  • Contributor
  • Posts: 15
  • Country: pt
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #224 on: December 25, 2018, 03:23:21 am »
Hi Taut,

probably the SVA3kX will solve all the 1015x issues, but what will be the price?
More then 2k hear in Europe, I presume.
I want to keep the value around 1,5k eur.
Just watch siglent site and the ssa3021 TG promotion finishes 12/2018,so, in few days.
I should to decide between this two models. I have some doubts about it.
Regards
Rodrigo

 

Offline tinhead

  • Super Contributor
  • ***
  • Posts: 1858
  • Country: 00
    • If you like my hacks, send me a donation
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #225 on: December 25, 2018, 09:15:14 am »
can someone test the latest firmware (V2.1.1.1.13)?

https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2018/08/SVA1000X-Firmware-Revise-History.pdf

Is the VNA still going from 10MHz? In the release note they mentioned changes to minimum frequency:
"VNA mode: fasten the VNA sweep speed; expand the minimum span from 10M to 10 kHz"

« Last Edit: December 25, 2018, 09:17:55 am by tinhead »
I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #226 on: December 25, 2018, 03:51:38 pm »
Hi Taut,

probably the SVA3kX will solve all the 1015x issues, but what will be the price?
More then 2k hear in Europe, I presume.
I want to keep the value around 1,5k eur.
Just watch siglent site and the ssa3021 TG promotion finishes 12/2018,so, in few days.
I should to decide between this two models. I have some doubts about it.
Regards
Rodrigo
I’d be very surprised if the current free TG gets dropped from the SSA models, yes it was a option when they were first released but I strongly suspect due to the popularity of the SSA models it made sense for Siglent to include the most basic option TG free of charge and SVA models come with TG free at release.

As I’ve mentioned earlier SVA1015X has a larger trial time usage of 120hrs that is large enough to allow several projects to be completed before deciding on what options to purchase for your requirements.
SVA can do a lot of tasks, most that I’ve barely used and Dave in his tear down just quickly investigated.

All we know about the coming SVA3000X models is pictures from Electronica from a couple of months ago, see here:
https://www.eevblog.com/forum/testgear/new-siglent-products-sds2000x-e-sva3032x-and-a-dc-load/msg1988441/#msg1988441

Avid Rabid Hobbyist
 
The following users thanked this post: ct1bxt

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #227 on: December 25, 2018, 04:07:21 pm »
can someone test the latest firmware (V2.1.1.1.13)?

https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2018/08/SVA1000X-Firmware-Revise-History.pdf

Is the VNA still going from 10MHz? In the release note they mentioned changes to minimum frequency:
"VNA mode: fasten the VNA sweep speed; expand the minimum span from 10M to 10 kHz"
The minimum span only, not sweep was reduced and in the previous 12a version firmware.
No changes have been made to existing data sheet specifications however some small functionality has been added along with bug fixes and some other improvements in version 13 firmware.
The USA FW history list:
https://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2018/12/SVA1000X-Firmware-Revise-History.pdf
Avid Rabid Hobbyist
 

Offline ct1bxt

  • Contributor
  • Posts: 15
  • Country: pt
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #228 on: December 26, 2018, 03:53:46 am »
"I’d be very surprised if the current free TG gets dropped from the SSA models, yes it was a option when they were first released but I strongly suspect due to the popularity of the SSA models it made sense for Siglent to include the most basic option TG free of charge and SVA models come with TG free at release. "

Me too. In one week we will know if the change that or keep the TG as a gift.
Happy new year and tks
Rodrigo
 

Online Mr. Scram

  • Super Contributor
  • ***
  • Posts: 6550
  • Country: 00
  • Display aficionado
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #229 on: December 26, 2018, 04:16:51 am »
Is anything known about the new higher frequency VNA that was presented a while back?
 

Offline hamtarociaooo

  • Newbie
  • Posts: 4
  • Country: it
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #230 on: December 30, 2018, 09:52:46 pm »
is there any news about the same ""procedure"" that has been done on the SSA3021X even on this model? there are a lot of cool options but the prices are a bit high for a non-professional user
 

Offline tautech

  • Super Contributor
  • ***
  • Posts: 14582
  • Country: nz
  • Taupaki Technologies Ltd. NZ Siglent Distributor
    • Taupaki Technologies Ltd.
Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #231 on: December 31, 2018, 12:35:14 pm »
is there any news about the same ""procedure"" that has been done on the SSA3021X even on this model? there are a lot of cool options but the prices are a bit high for a non-professional user
Welcome to the forum.

I don’t know any reason why it will be different to SSA models however how I got the options out of SVA was a bit different.  :-X
My SSA used the standard procedure.

Is anything known about the new higher frequency VNA that was presented a while back?
Nothing more is known other than mentioned in reply 228.....could be months away.  :-//
Avid Rabid Hobbyist
 
The following users thanked this post: Mr. Scram

Offline