[TowerTalk] ICE-419a Bandpass filter

Dave Hachadorian K6LL at ARRL.net
Tue Jul 22 17:09:08 EDT 2008

By the way, you can unsolder the capacitors and measure the 
capacitance value pretty accurately using an antenna 
analyzer in the capacitance mode. Look for large changes in 
value. I would bet on the "resonating" capacitor on the 
transmitter side to be bad.

When reinstalling new caps, you can tweak for min swr by 
wearing a rubber glove and transmitting low power. Slide the 
unit out of the case only as far as necessary to reach in 
there. Squeeze the coils and move the caps for min swr. I 
suppose you could use an antenna analyzer, rather than a 
real transmitter, but that wouldn't be as adventurous.

Dave Hachadorian, K6LL
Big Bear Lake, CA


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