[CQ-Contest] Fw: Bandpass filter

Dave Hachadorian k6ll at arrl.net
Mon Jul 9 06:39:19 PDT 2012

Yesterday (email below) I recommended some capacitor replacements 
for the ICE 419 bandpass filter box.  I see that Mouser now 
carries a decent stock of the CDV16 series of capacitors, which 
should be even better for this application.

I would replace the 10 meter caps with THREE of these:

Replace the 15 meter caps with THREE of these:

Thanks to K1TTT for pointing out the advantages of the CDV16 

Dave Hachadorian, K6LL
Big Bear Lake, California

-----Original Message----- 
From: Dave Hachadorian
Sent: Sunday, July 08, 2012 1:07 PM
To: Keith Dutson ; cq-contest reflector
Subject: Re: [CQ-Contest] Bandpass filter

> 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