Author Topic: Siglent SVA1015X and SVA1032X 1.5, 3.2GHz Spectrum & Vector Network Analyzers  (Read 35231 times)

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Offline rf-loop

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #175 on: August 11, 2018, 10:26:27 pm »
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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #176 on: August 14, 2018, 09:43:36 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.
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, 09:45:26 am by tautech »
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Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #177 on: August 15, 2018, 10:10:36 am »
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, 10:12:48 am by tautech »
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Offline xaxaxa

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #178 on: August 15, 2018, 10:13:29 am »
I'm pretty happy with this, what do you RF gurus think ?
200 MHz span on 315 MHz

Did you calibrate it?
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #179 on: August 15, 2018, 10:14:58 am »
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
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Online PA0PBZ

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #180 on: August 15, 2018, 11:01:36 am »
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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #181 on: August 15, 2018, 11:16:06 am »
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.

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Online PA0PBZ

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #182 on: August 15, 2018, 11:34:43 am »
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.
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Offline PhilipPeake

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #183 on: August 15, 2018, 04:26:32 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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #184 on: August 16, 2018, 05:47:10 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.
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.
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Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #185 on: August 18, 2018, 04:22:29 am »
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Offline PhilipPeake

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #186 on: August 19, 2018, 01:28:06 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, 02:31:49 am by PhilipPeake »
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #187 on: August 19, 2018, 03:21:54 am »
Here's some real measurements, TG into input, TG ON, SA mode, direct connection with N-N cable.

« Last Edit: August 19, 2018, 03:23:39 am by tautech »
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Offline PhilipPeake

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #188 on: August 19, 2018, 04:28:36 am »
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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #189 on: August 19, 2018, 08:23:27 am »
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, 04:23:30 am by tautech »
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Offline orin

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #190 on: August 19, 2018, 04:29:25 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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #191 on: August 19, 2018, 10:14:49 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.

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Offline orin

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #192 on: August 20, 2018, 04:05:31 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.




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

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #193 on: August 20, 2018, 09:15:09 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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #194 on: August 21, 2018, 03:53:02 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.




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.

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Offline PhilipPeake

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #195 on: August 21, 2018, 03:41:40 pm »
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 21, 2018, 05:03:05 pm by PhilipPeake »
 

Offline PhilipPeake

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #196 on: August 21, 2018, 08:24:34 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.

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.
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #197 on: August 21, 2018, 08:47:23 pm »
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.
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Online TK

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #198 on: August 21, 2018, 09:04:34 pm »
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?
 

Online tautech

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Re: Siglent SVA1015X 1.5GHz Spectrum & Vector Network Analyzer
« Reply #199 on: August 21, 2018, 09:13:21 pm »
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
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