[CQ-Contest] Bandpass filter

Keith Dutson kdutson at sbcglobal.net
Sun Jul 8 14:01:22 PDT 2012

Hot dog!  Never thought of that.

Thanks for the tip.  I will be ordering a batch of these for both bands.

73, Keith NM5G 

-----Original Message-----
From: David Hachadorian [mailto:k6ll.dave at gmail.com] On Behalf Of Dave
Sent: Sunday, July 08, 2012 3:08 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 at 
>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


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