Re: Coil behavior (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Tue, 24 Oct 2006 11:23:20 -0700
From: Ed Phillips <evp@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Coil behavior


Glen,

Surprising as it may seem, you can add an external inductance in series 
with
your primary with only an insignificant decrease in overall efficiency.  
Try
adding a few turns of, say, #8 insulated wire around a 4" piece of PVC in
series with your primary.  This is called an "off axis" coil, because
usually you don't want it magnetically coupled to your primary or 
secondary.
--Steve Y."

    The extra inductance does reduce the effective coupling factor 
though.  I've used a roller coil to tune a primary and had to increase 
coupling correspondingly but worked just fine.

Ed