[TowerTalk] ICE-419a Bandpass filter

Michael Tope W4EF at dellroy.com
Tue Jul 22 22:02:08 EDT 2008

Dave Hachadorian wrote:

>----- Original Message ----- 
>From: "Mike Schelly" <hinrgdj1 at comcast.net>
>To: "'Towertalk Reflector'" <towertalk at contesting.com>; 
><ck2jones at yahoo.com>
>Sent: Tuesday, July 22, 2008 3:24 PM
>Subject: Re: [TowerTalk] ICE-419a Bandpass filter
>>The Cornell Dubilier DPPM20D1K from Mouser for 20M and if 
>>the "coupling"
>>cap is bad replace with the CDV16FF241J03...240pf, this 
>>CDV16 series is RF
>>rated! Also at Mouser.
>>Mike K4EAR
>I don't know how stable polypropylene would be at 14 MHz in 
>a tuned circuit.
>The ones I've used successfully in the past are the mica 
>CD15, CD19, CDV16 and CDV19, all on page 838 of the Mouser 
>catalog. Use Mouser.com search on those terms, and more 
>values will show up than are shown in the catalog.
>Dave Hachadorian, K6LL
>Big Bear Lake, CA

Yeah, Dave, if you compare the data sheets for the polypropylene and the 
mica, the mica sure looks like it would be much better for high current 
RF applications. That's not to say the the poly cap won't be good enough 
in this particular application. Sounds like Mike K4EAR has tested the 
poly caps in that application and found them to be adequate.

73, Mike W4EF..............

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