Author Topic: SSA3032X-R AVG100 Scectra of LiteVNA64  (Read 4537 times)

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Offline KeBeNe

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #25 on: October 22, 2023, 05:02:14 am »
The noise distribution the analyzer shows is correct and has to do with the Rayleigh function.
....

I don't think the Rayleigh function explains this problem and applies in this case.
Please check the behavior of the disabled FFT sweep.
 

Offline markus_jlrbTopic starter

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #26 on: October 22, 2023, 08:12:35 am »
@KeBeNe

>Please check the behavior of the disabled FFT sweep.  ???

Sorry not catch you - could you please provide a more detailed procedure.

Thanks in advance.

Markus
 

Offline kladit

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #27 on: October 22, 2023, 09:01:20 am »
@KeBeNe 

I also wrote:
"Your noise  was much higher even at the high frequency side, the cause of that has to be investigated first."

I still hope one of the owners of a comaprable R&S analyzer  can setup the same and show us the results.

@Markus
please post a screenshot and use markers and noise markers to make the results numerical comparable.
 

Offline Performa01

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #28 on: October 24, 2023, 06:54:29 pm »
I don't have a comparable analyzer, yet it can provide RT-SA at narrow spans like 100 kHz.

Attached is the 100 MHz example. At a VBW of just 3 Hz averaging is rather slow, so I made do with 10 averages instead of 100:

SH_SA44_PN_100MHz_-18.5dBm_Span100kHz_AVG10
 

Offline markus_jlrbTopic starter

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #29 on: October 25, 2023, 05:57:27 am »
From my point of view not the noise level is to be discussed but the avg function.
Noise could be indeed higher at left side of the carrier but nevertheless the left side
trace have to be smoother when 100 times the noise was run into the avg function.

I will compare next week, if I have time, the same measurement at a SSA3021X (without+)
and report the result.

Markus   
 

Offline kladit

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #30 on: October 25, 2023, 10:11:01 am »
@perfoma01,
remarkable low noise, your SH_SA44  looks much better than the SSA3075X-R.
Does its software exist for linux or is it windows only?
Here my screenshots, 100 MHz signal originates from SDG6052X.

« Last Edit: October 26, 2023, 10:26:31 am by kladit »
 

Offline Performa01

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #31 on: October 25, 2023, 11:01:23 am »
remarkable low noise, your SH_SA44  looks much better than the SSA3075X-R.
Well, the SA44 has a very different mixing scheme, so it is hard to beat at lower frequencies and narrow spans. In general, it has quite some limitations, but whith the right settings it can outperform most of the "big boys" in certain situations.

Does its software exist for linux or is it windows only?
There is at least a Spike version for 64-bit Ubuntu.

Here my screenshots, 100 MHz signal originates from SDG6052X.
My signal source has been a SDG6052X as well. For the following screenshots this wasn't even necessary, as the SA44 happens to produce a strong spur at exactly 100 MHz :-DD

The attached screenshots show the noise floor around 100 MHz with and without preamplifier.

SH_SA44_Noise_100MHz_PA-on
SH_SA44_Noise_100MHz_PA-off

 

Offline KeBeNe

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #32 on: October 25, 2023, 02:42:24 pm »
@KeBeNe

>Please check the behavior of the disabled FFT sweep.  ???

Sorry not catch you - could you please provide a more detailed procedure.

Thanks in advance.

Markus

I think you could switch between FFT and accuracy under sweep settings.

What do you hope for when the measurement is made with an R&S Analyzer?
I could offer a measurement with an SA4401A VNA and an FSIQ  or SMIQ + FSIQ.
 

Offline tautech

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #33 on: October 26, 2023, 08:47:45 am »
Just because I had one out and not yet had access to an X-R, a quick check with my SNA5004A in SA mode.
Avid Rabid Hobbyist.
Some stuff seen @ Siglent HQ cannot be shared.
 

Offline KeBeNe

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #34 on: October 28, 2023, 04:51:49 am »
What I saw in the pictures of @kladit that the correction is off, is that the default setting on the R model?
 

Offline tautech

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #35 on: October 29, 2023, 01:00:10 am »
Now with access to SSA3075X-R I can certainly replicate the issue.
To be reported.....
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Some stuff seen @ Siglent HQ cannot be shared.
 
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Offline markus_jlrbTopic starter

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Re: SSA3032X-R AVG100 Scectra of LiteVNA64
« Reply #36 on: October 29, 2023, 04:30:20 pm »
Thanks tautch for your effort and confirmation of my findings.

So now I can laid back and wait until Siglent fix the issue.

Markus

 
 


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