Author Topic: User feedback on KC901S+ and KC901V handheld network analysers  (Read 2876 times)

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Offline RFDUK

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The KC901 products potentially look a very attractive addition to an RF lab, particularly for field work, off air level monitoring of systems in dev, antenna tuning and debugging plus usable VNA performance with good presentation of the numbers.

The Signal Path review from Shahriar gave me a positive view of the value in these instruments.

Are there any owner / users of any KC901 instrument that would offer their experiences?

Many thanks.
Weak signal comms specialist. Very low noise amplifier & precision calibrated noise source manufacturer. Embedded antenna design services. http://www.g8fek.com  http://www.rfdesignuk.com
 

Offline Safar

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #1 on: March 04, 2018, 10:47:30 am »
do you want to listen to what you dont want to listen? i'm a KC901V owner and i think the sole owner in this forum.
Me also.
 

Offline Safar

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #2 on: March 04, 2018, 11:46:58 am »
Of course this device can do some measurements, but need to understand that is not "fieldfox" and have a limitations. For this price it works, but I can't compare it with more serious devices as I don't have them.

Some of Limitations (901v):
1) Lower band (10..50kgz) looks not good. But I think external coupler will help as device can works in this mode. Don't use it yet.
2) SOL cal don't use fringe effects in calculation. You can enter only electrical paths length of each of SOL parts. But I think that is enough for device measurements accuracy. Also you can save any measurements in files on microSD card and feed it to some external applications, even make calibration with all coefficients.
3) Gen have a lot of spurious (suppose it have fractional divider pll)
4) Spectrum analyzer have max 30KHz RBW, so if you want to look at wide band or use small number of samples you have big chance don't get all spectrum info. I think that warning sign will help to pay attention to leaky spectrum but device have no any sign now. May be I will write to support.
5) You should look first to support site and make your opinions. For me is a little bit strange this kind of service. But good news that new FWs released regularly

I saw some application in github but don't try to use it. It may be helpful for transfer data to PC directly as device have LAN port.

In general device leave good impression for me.
« Last Edit: March 04, 2018, 11:57:21 am by Safar »
 
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Offline RFDUK

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #3 on: March 04, 2018, 01:40:16 pm »
Many thanks for the information Safar. The PC data linking is interesting, I'll take a look.

A full PC control with screen for bench use would add significant value for me, but no sign of that.

It's very useful to hear from an owner with a good impression.
Weak signal comms specialist. Very low noise amplifier & precision calibrated noise source manufacturer. Embedded antenna design services. http://www.g8fek.com  http://www.rfdesignuk.com
 
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Online Mechatrommer

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #4 on: March 04, 2018, 02:13:55 pm »
I saw some application in github but don't try to use it. It may be helpful for transfer data to PC directly as device have LAN port.
can you provide the link? i thought i saw the open source code for the VNA somewhere. but i cant find it anymore.

5) You should look first to support site and make your opinions. For me is a little bit strange this kind of service. But good news that new FWs released regularly
the bbs site has become spam heaven. you need to scroll few click down to get the link.

It's very useful to hear from an owner with a good impression.
Shariar's review alone will be adequate for you then ;)
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 

Offline Safar

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #5 on: March 04, 2018, 04:18:55 pm »
https://github.com/bg8npk/KC901S

But I see that is just c++ source code (but with corrections for 901v). Need to compile.
« Last Edit: March 04, 2018, 04:28:50 pm by Safar »
 

Online TheSteve

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #6 on: March 04, 2018, 06:47:14 pm »
Dr Kirkby wasn't impressed by them I guess:
http://www.kirkbymicrowave.co.uk/support/VNAs/Deepace/
VE7FM
 
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Offline Safar

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #7 on: March 04, 2018, 07:43:14 pm »
Dr Kirkby wasn't impressed by them I guess:
http://www.kirkbymicrowave.co.uk/support/VNAs/Deepace/
Hi! Suppose the reason is that Deepace make SOL cal in current FW without fringe calc. So think Deepace users not a target group for Dr. Kirkby :) But as I understand it possible use some PC application and make all calibration on PC side with all fringe data.

Of course nobody tell here that Deepace make magical device for 2k$. Think it don't have enough accuracy for use fringe data.

But for me personally very interesting how good his standards on 6..7 GHz (as he used "retail" parts as I understand). Especially in _stability_ side. I read Kirkby topic here and saw some doubt on it. But it is only one trust suggestion in middle level price who make all data for selled standards.

For use with Deepace I bought SMA Rosenberger kit on SDR-kits as it have delay data.
 
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Online TheSteve

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #8 on: March 04, 2018, 11:31:20 pm »
Yeah, obviously the price always has to be factored in.
VE7FM
 

Offline RFDUK

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #9 on: March 05, 2018, 01:07:46 pm »
The review by Shahriar observed LO PLL instability at higher frequencies. Does anyone know if that was resolved by Deepace?

I'm waiting on a second response from the factory but they don't have a difinitive answer yet.
Weak signal comms specialist. Very low noise amplifier & precision calibrated noise source manufacturer. Embedded antenna design services. http://www.g8fek.com  http://www.rfdesignuk.com
 

Offline dk5ya

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #10 on: March 23, 2018, 10:03:43 pm »
The review by Shahriar observed LO PLL instability at higher frequencies. Does anyone know if that was resolved by Deepace?
I have never been able to determine that yet. Also on the analyzer (Siglent 3032X) I could not detect any problems with the LO. But I measure regularly only up to about 2 GHz.
Its a KC901S+, bought back in October last year.

Udo
 
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Offline Wirehead

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #11 on: April 16, 2018, 09:43:22 am »
The review by Shahriar observed LO PLL instability at higher frequencies. Does anyone know if that was resolved by Deepace?
I have never been able to determine that yet. Also on the analyzer (Siglent 3032X) I could not detect any problems with the LO. But I measure regularly only up to about 2 GHz.
Its a KC901S+, bought back in October last year.

Udo
Where did you buy it in Europe - trying to avoid any extra customs fees.. What's your opinion / experience on the device up to now? I'm also looking at the 901S+. Have you used it in the HF part as well?
"to remain static is to lose ground"
 

Offline dk5ya

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #12 on: April 18, 2018, 08:46:10 am »
@Wirehead: you have mail.
 
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Offline Wirehead

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #13 on: April 18, 2018, 09:09:07 am »
@Wirehead: you have mail.

Thanks Udo - appreciate it!  :-+
"to remain static is to lose ground"
 

Offline Ivan7enych

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Re: User feedback on KC901S+ and KC901V handheld network analysers
« Reply #14 on: April 18, 2018, 10:16:29 am »
Hello,

I've got the KC901V several month ago (mainly because of Signal Path review).

For me it works best in S11 measurements, I can test both 2.4GHz antennas and 5GHz (for FPV copters).

S21 accuracy is limited by 2 things -
1. poor 50ohm matching of output and input ports, this can be improved a bit by 3-6 dB attenuators at output port.
2. internal leakage between ports on frequencies (> 3-4GHz)
 
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