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Re: [TCML] Twin coils primary lead design

The best answer is to eliminate the lead inductance altogether.

One way is to mount the oscillator in an enclosure directly under the coil,
and the pri/sec is supported on the ends with 3/8" acrylic --- sort of like
a pedestal arrangement.

Dr. Resonance

2009/8/1 Peter Terren <pterren@xxxxxxxxxxxx>

> I am working on a small twin coil system with a cylinder primary and small
> spherical topload. Using a single coil only, run by a single MOT SISG, it
> puts out a 60 cm spark for a 50 cm secondary winding.
> I am finding results a bit limited when run as a twin system due to the
> length of the primary leads.  With a series primary arrangement I should
> tune to 3 turns on the primary but with loose leads this drops to about 1.5
> turns which is not efficient and spark length is less than 30cm despite
> double the power.
> With parallel primary windings, I should tune to 6 turns but it is reduced
> to 3 turns with the lead in wire inductance. It seems like I am wasting half
> of my inductance.
> Best performance of 90cm sparks with 2 MOT SISG is with a reduced tank
> capacitance to allow greater inductance in the primary using 8 turns in
> parallel connected primaries with lead in wires taped together sort of
> transmission line like.
> My question: How can I minimise the effect of primary lead inductance.
> Should I use two close parallel conductors (sort of transmission line like)
> or would a coax arrangement be better?  I can make up a coax system with
> copper pipe and plastic tubing covering 1/4 inch tubing. I don't really
> understand the concept of impedance matching as applied to Tesla coil
> primaries though or whether it is even likely to be relevant.
> Any thoughts?
> Peter  www.tesladownunder.com
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