[CQ-Contest] Bandpass filter

Dave Hachadorian k6ll at arrl.net
Sun Jul 8 13:07:56 PDT 2012

> I use the ICE 419 banpass filters... Ten meters is by
>far the most vulnerable section.  I have a large supply of 270pf
>500v silver
>mica caps on hand to make repairs.  Two of these caps are wired
>in parallel
>to get 540pf for the tank circuit.  If I could find caps rated
>1000v, I
>would use them.

It's the current, not the voltage that causes capacitors in the
ICE filters to heat up and change value.  The ones that fail are
the caps that go to ground on the radio side (not the antenna
side) of the pi-net.  I helped a friend service his unit, and we
replaced the 10 meter caps with THREE of these:

We also replaced the 15 meter caps with THREE of these:

Dave Hachadorian, K6LL
Big Bear Lake, California


More information about the CQ-Contest mailing list