[hpsdr] Mercury SSB Phase Noise Testing

[Larry Gadallah]

Ron, I'm glad you are doing some testing like this. I've been anxious to 
find out what the performance of Mercury would be, although performance 
testing of SDR's seems to be a new art and techniques used to test 
"classic" receiver performance do not always produce meaningful results 
for SDRs.

Ronald Cox wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> All,
> I have been testing the SSB Phase noise on a random Mercury board and 
> have posted the results at: 
> http://openhpsdr.org/wiki/index.php?title=Receiver_Performance_Tests
>
> Please let me know if you see any issues with the tests so far.

The only concern I have with the phase noise results is the lack of data 
for carrier offsets beyond 1 kHz. The data presented so far would be 
relevant for considering close-in CW QRM, but not SSB QRM that might be 
several kHz away. Also, phase noise figures published for other 
radios/VFOs often only quote the parameter at 10 kHz separation. My 
understanding is that a good crystal oscillator or some of the old 
tube-type VFOs could produce phase noise figures at 10 kHz of about -150 
dBc/Hz or less.

Cheers,

-- 
Larry Gadallah, VE6VQ/W7         lgadallah AT gmail DOT com
PGP Sig: B5F9 C4A8 8517 82AC 16B6  02B6 0645 69F0 1F29 A512


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