I noticed distortion in my audio when I set the quad for vertical or circular
polarization... horizontal was no problem. I discovered that the rotor cable
(running vertically) was picking up RF and bringing it into the shack. Problem
very noticable with the linear on. The cure: attach the rotor cable to the coax
entrance service panel with a high quality military connector and ADD RF BYPASS
CAPACITORS (.01UF 1KV) TO EACH LINE TO GROUND. Problem solved. It took me weeks
to figure this out. The clue was: The rotor box control indicator would
"modulate" the direction indicator about 30 degrees depending on the power
level... with the box off. I just happen to see it while transmitting, and
wondered how it could move with the box off! I then realized where the audio
distortion was comming from. I previously saw the indicator moving with
modulation, and thought it was a line regulation problem moving the indicator
with the linear on. Very weird. Talk about barking up the wrong tree!
George AB2KC
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