Re: Phase noise suggestions
Posted by
G3VVT on
Mar 22, 2005; 12:16pm
URL: http://elecraft.85.s1.nabble.com/Re-Phase-noise-suggestions-tp376038p376043.html
In a message dated 22/03/05 07:38:18 GMT Standard Time,
[hidden email] 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
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