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Siglent SSA 3021X plus high phase noise

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Orange:
Some more pictures from an SSA3032X

Looks better at 10MHz

drew23:
Hi All.

I have a PN2060A phase noise analyser and have made a blog post on it, together with phase noise results for the 10 MHz TCXO output of my Siglent SSA3021X and Rigol RSA3015N.

The Siglent is okay at -141 dBc/Hz @ 10 KHz and I think in spec but the Rigol is considerably better at -167 dBc/Hz @ 10 KHz.

In a later, draft post, the phase noise for a Keysight MXA N9020A Vector signal analyser is -163 dBc/Hz @ 10 KHz. This was a very expensive instrument in its day and depended heavily on its TCXO for performance. So the Rigol value is pretty good for a much cheaper instrument.

I am not sure of the method used in the specifications of the Siglent. Presumably, it is the output of the tracking generator at 1 GHz. The PN2060A phase noise analyser can only measure to about 130 MHz at baseband, without a downconverter. I have just moved house and my gear is disorganised. However, I might try measurements at a higher frequency.

Regards Drew VK4ZXI

https://vk4zxi.blogspot.com/2023/07/an-economical-way-to-measure-phase.html

https://vk4zxi.blogspot.com/2023/08/have-pn2060a-phase-noise-analyser-will.html

RoV:
I have both an SSA3021X+ "upgraded" to SVA1032X and an SDG2042X "upgraded" to SDG2122X, so I tried to replicate your configuration.
Additionally, I tested a KVG OCXO, also 10 MHz.
My OCXO is fitted with an output attenuator and gives ~-11.7 dBm on the fundamental, so initially I tried both generators at -11.7 dBm. Same settings as OP, except for input attenuator at 10 dB.
Results were ~identical for the two generators and phase noise at 10 kHz ~99 dBc/Hz
(OCXO)

(yellow OCXO, pink SDG)
By increasing the output level of the SDG at 0 dBm and with SSA input attenuator at 20 dB, results remain consistent (OCXO trace is same as before, taken with 10 dB attenuation)
(yellow OCXO, pink SDG)

807:
Just measured mine again at 10MHz, but this time using a Marconi 2024 generator which has much better phase noise than the 2022E I used in earlier post.

The close-in noise is better on this generator, but I get similar reading to my previous one at just -86.66dBm/Hz @10kHz.

Is there a problem with mine & angelcruiz's analyzers? Why are we getting such pronounced "hills" compared to others?

edit...I tried the measurements at -10dBm, but results were the same.

btw...mine has been "upgraded", but not to a VNA

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