During the 2009 CQWW CW contest, I got a report of severe chirp from one of
the stations I worked.
I turned on my OMNI 6 to listen to my signal and there definitely was a bad
case of chirp.
I confirmed this on 15 meters, 20 meters, and 40 meters. 80 and 10 showed no
issue.
External KW amp on or off did not make a difference.
I use the K3 12VDC OUT port (0.5 A MAX Switched) to drive antenna switching
relays and the control circuit (CMOS BCD to decade decoder)
that is driven from the K3 ACC port.
To solve the chirp, I used a couple of clamp on ferrite cores on BCD output
from the ACC connection AND the 12 VDC OUT.
Remove the cores, the chirp returned.
I have not yet tried to separate the BCD signals from the 12 power to
determine if suppression is necessary on one or both.
FYI
Lee
N8LJ
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