Re: Primary/NST case coupling effects

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jeremy Gassmann" <gmann-at-fuse-dot-net> 

My setup has my 4 transformers mounted underneath the primary upside-down.
The distance between the primary and transformers is about 6 inches with
3/4ths of an inch thick poly coated oak wood between them.  Do you think
that this configuration will reduce the energy in the primary?  That is a
good question that you asked...I never have thought about that.

Jeremy Gassmann
Cincinnati, Oh
http://jeremyee.tripod-dot-com

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, November 20, 2003 7:23 PM
Subject: Re: Primary/NST case coupling effects


 > Original poster: Esondrmn-at-aol-dot-com
 >
 > In a message dated 11/20/03 6:49:55 AM Pacific Standard Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 > >Does situating the earthed metallic case of a large NST below the primary
of
 > >a TC have much of an effect on:
 > >
 > >1) Changing the resonant frequency of the primary
 > >
 > >2) Changing the coupling
 > >
 > >3) Inducing eddy currents into the NST case
 > >
 > >4) Inducing RF into the NST windings?
 > >
 > >Just wondering.
 > >
 > >Tom L.
 >
 >
 > Tom,
 >
 > I haven't noticed any problems locating a normal metal cased nst, with
case
 > grounded, below the primary when the spacing is about 12" or greater.  I
 > haven't tried it closer but we know any large metal objects will load the
 > primary and rob power from the system if located within the field produced
 > by the primary.  I would expect it to lower the self resonant frequency of
 > the primary as you reduce the distance between the primary inductor and
the
 > transformer case.  It should induce RF currents into the case, which is
 > grounded.  I doubt it would couple through the case and into the
 > windings.  I don't think it reduces coupling since that is determined by
 > the physical relationship between the primary and secondary.  Since it
robs
 > power from the primary system, you could probably then increase the
primary
 > / secondary coupling without causing racing sparks because the amount of
 > power being coupled to the secondary is less.
 >
 > Just my thoughts, Ed Sonderman
 >
 >