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

Mon, 11 Nov 2002 14:24:43 -0800

Interesting comment/observation, Ralph.  Don't misunderstand me;  I do not
for a minute doubt what someone says who has DONE it ;-)  It does seem sort
of counter-intuitive to me and things like that start me wondering.  Like,
does it fracture because of brittleness, i.e. would 2x the power absorption
in nylon go "un-noticed".  Does the lead content play any part?  Or other
additives?  Would glass from certified-safe-for-microwave dishes do better?
Curious minds and all that <G>

Gary WA6DTX

----- Original Message -----
From: "Ralph Hartwell" <[email protected]>
To: <[email protected]>
Sent: Monday, November 11, 2002 1:53 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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