[Lowfer] Question on building homebrew variable caps...

Mon, 11 Nov 2002 17:07:48 -0500

Could I suggest PTFE...That is good old teflon?
It is available through McMaster-Carr. I used this when I built my 500W
2-meter amp using a single 4CX250R. It handles 4KV without a problem.

Denis - W1WV

----- Original Message -----
From: "Ralph Hartwell" <[email protected]>
To: <[email protected]>
Sent: Monday, November 11, 2002 4:53 PM
Subject: Re: [Lowfer] Question on building homebrew variable caps...

> > consider a set of fixed cap plates separated by glass plates
> > now sliding the glass in and out between the plates will make
> > the cap vary. Advantage would be a cap with good mechanical
>
> Glass is a very lossy dielectric at RF.  Ask the guys who build Tesla
> Coils.  I have popped more glass plate caps than I want to think about.
> Much better is PVC plastic.
>
> 73,
>
> Ralph   W5JGV / WC2XSR / 13
>
> The current On-The-Air status of WC2XSR/13 is available at:
> http://home.att.net/~shmrg/wc2xsr-13_log.htm
>
> My 600 Meter Research Group files are at:
> http://home.att.net/~shmrg
>
> My Home Page is at:
> http://home.att.net/~ralph.hartwell
> Home of the Rife Biomedical Research Web Ring
>
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