[time-nuts] Phase Noise Comparisons

KA2WEU at aol.com KA2WEU at aol.com
Sat Jan 16 19:45:23 EST 2016


Typically,one should not look at just on offset point,  Here is an  example.
 
73 de Ulrich 
 
 
 
 
In a message dated 1/16/2016 7:01:41 P.M. Eastern Standard Time,  
rob at nc0b.com writes:

I did  some interpolation to compare the specs for phase noise of the 8660 
the way it  was done then to the present method. I think it is going to be 
something like  -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier 
 frequency.



As a comparison, the 8662A is about -135 dBc/Hz and  the 8642A is better 
than -150 dBc/Hz.

Actual measurements on multiple  generators in my lab.  Unfortunately I 
have never used or measured an  8660.



3335A -128 dBc/Hz

3336C -120 dBc/Hz

3325A  -115 dBc/Hz (original version.  Later improved by 4 pr 5 dB after 
the  3336C came out.)



As a comparison a Rigol DG4162 is -115 dBc/Hz  All at 10 kHz offset and on 
the 20 meter band.



It depends what  you are trying to measure. Sensitivity or noise floor, 
anything will work  within the range of specified output accuracy and leakage.  
On the other  hand, if you are trying to measure the dynamic range of a 
receiver, or its  phase noise characteristics, you cannot do that with most  
generators.



Rob,  NC0B







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