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Re: [TCML] Twin coils primary lead design
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.
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