[hpsdr] Mercury SSB Phase Noise Testing

[John Ackermann N8UR]

Following myself up, the HP Journal article announcing the 10811A says 
that its phase noise is 10-15dB lower than the 10544A.  That implies 
that a typical 10544A noise floor is around -140 to -150dBc/Hz, and 
probably hits that floor at around 10kHz offset as does the 10811A.

John
----

John Ackermann N8UR said the following on 10/26/2009 04:56 PM:
> One thing to note is that IIRC the 10811A noise floor is spec'd to be 
> significantly lower than the 10544A.  However, both are probably "good 
> enough" for this purpose.
> 
> I did some phase noise tests on Penelope last year and the results are 
> at http://www.febo.com/pages/penny/penny-test_1-spectrumplot.png.
> 
> This was measuring against an ultra-low-noise Wenzel oscillator.
> 
> I'm not entirely happy with the test conditions when I did that 
> measurement, and I've been meaning to redo the test, also using 
> Excalibur to see if the impact of different 10 MHz references is 
> noticeable.  Perhaps I can do that this coming weekend.
> 
> Since Penny and Merc use the same type of 122.88 MHz oscillator, the 
> rsults should be comparable, subject to (a) noise contribution from 
> Penny's DAC and amplifier and (b) noise contribution from Merc's CORDIC 
> and ADC.
> 
> John
> ----
> Marco IK1ODO wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> At 21.34 26/10/2009, you wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> I am setting up a HP 10544A Crystal Oscillator at 10 MHz, the specs on
>>> it are -115dBc/Hz at 10 Hz offset (max) and -130 dBc/Hz at 10 KHz
>>> offset (max). That should work better?
>>>
>>> Ron, W9KFB
>>> Indianapolis
>>
>> Ron, see my data in http://www.spinelectronics.eu/ftp/HPSDR_PN.pdf - 
>> you need -150 dBc at 10 kHz.
>> The HP 10811A worst case specs are far from the typical data; the 
>> 10544A should be similar to the 10811A, but I don't have the data on 
>> hand.
>>
>> 73 - Marco IK1ODO
> 

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