[TowerTalk] ICE-419a Bandpass filter

[Mike Schelly]

Not tested yet!...that's what came "stock" and worked fine until I
moved/misplaced the filter inline with an amp switch.
I'm still in a failure mode with just the series mica replaced with a CDV16
I had on hand and use for PI-inputs for G-G amps. I WILL be ordering both
the DPPM and CDV30 series. My first choice will be the CDV30's for a sub.

Mike, K4EAR

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Michael Tope
Sent: Tuesday, July 22, 2008 9:02 PM
To: Dave Hachadorian
Cc: Towertalk Reflector
Subject: Re: [TowerTalk] ICE-419a Bandpass filter


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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