Re: Primary Coil Design
Subject: Re: Primary Coil Design
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Date: Tue, 2 Apr 1996 09:05:37 +1200
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I guess this subject has drifted a little. Mark wrote...
> A thought occurred to me while reading this thread. The
> toroid acts like a shorted turn, N inches above the primary, this
> decouples the top portion of the secondary,from the primary, and
> allows it to act as a magnifier coil.
> Jim and others, I recall that someone examined this hypothesis
> using a toroid with a cut across it so it was no longer a closed
> circular loop. Sorry, don't remember who right now, will look
> through my references. Anyways, it did not appear to affect
> perfomance a whole lot with the toroidal loop open-circuited. Has
> anyone tried this recently, or has the ability to try it in a
> fairly controlled manner?
I tried this last year. I measured fr of an isolated secondary and
toroid, then cut a sliver vertically thru the toroid. No change in fr
with the terminal height unchanged.