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[Towertalk] Ham-M RF in the shack

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Subject: [Towertalk] Ham-M RF in the shack
Date: Wed, 01 Jan 2003 18:03:34 -0500
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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