[hpsdr] Mercury SSB Phase Noise Testing

[John Miles]

Typically the phase noise of any SDR will simply be that of its DDS, which
can be extrapolated from the DDS's spec sheet for the clock and output
frequencies being used.  You can't measure it with an 8656B, as the
generator is far noisier than any DDS.

The best approach would be to simply use the receiver and FFT software to
look at a single tone from a clean crystal oscillator.  The result is the
phase noise response, less 10*log(BW) where BW is the bandwidth per bin,
plus a dB or two for the window function's noise response.

-- john, KE5FX

>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello Ron.
>
> I had a look at the specs for HP8656B and the phase noise from
> 0,1-123,5MHz at 20 KHz ofset is -114dBc/Hz so I think most of the
> noise is
>  from the generator.
>
> 73, Kjell LA2NI.
>


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