[Elecraft] Phase noise suggestions

[G3VVT at aol.com]

In a message dated 22/03/05 07:38:18 GMT Standard Time,  
stewart at baker.nildram.co.uk writes:

Any  modulation of the K2 PLL will now appear as sidebands to the main  
signal.
They will be spaced at either 50Hz (Europe) or 60Hz. If the problem  is 
intense 
there may be harmonics.


---------------------------------------------
 
Take care with this test as the PC itself also can produce these effect I  
presume due to the PC PSU.
 
I ended up having to put in a 600 ohm 1:1 transformer to remove the effect  
here with harmonics going well up towards the top end of SSB bandwidth at 100Hz 
 intervals from 150Hz after the initial 50Hz spike. Thought it was the 
inclusion  of an LF/RF filter system in the 230AC power input to the PC, but find I  
get exactly the same effect with a recently acquired laptop on it's own 
230VAC  SM PSU.
 
The bottom line is before condemning the K2 check that the effect does not  
occur on other radios first!
 
Bob, G3VVT