[hpsdr] Mercury SSB Phase Noise Testing

[John Ackermann N8UR]

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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