Re: Secondary Core.

To: tesla@pupman.com
Subject: Re: Secondary Core.
From: "Gavin Dingley" <gavin.dingley@astra.ukf.net> (by way of Terry Fritz <twftesla@uswest.net>)
Date: Wed, 19 Apr 2000 17:18:40 -0600
Approved: twftesla@uswest.net
Delivered-To: fixup-tesla@pupman.com@fixme

Hi Charles,
the PVC plastic of the former would have more of an effect on the
distributed capacity as it has a dielectric constant. So the
self-resonant frequency (either modeled as a lumped LC circuit or as a
transmission line <g>) would alter according to the dielectric constant
of the coil form.

Regards,

Gavin, U.K.

Tesla List wrote:

> Original Poster: "Charles Arruda" <carruda@channelseek.com>
>
> What effect does the secondary "core" have on the overall
> design of the coil?  Most people tend to use PVC, but does the
> material and its thickness have an effect on the resonant
> freq. of the secondary?  I would think it would have an effect
> on the inductance and cause the freq. to shift.  What are the
> offsets to the resonant calculations?  Has anyone tried
> "unique" materials to wrap their coil on? What effect does
> having an outside covering on the coil (several layers of an
> insulative plastic?  Does it help with shorting or corona?
>
> Charles Arruda