RE: Tesla Coil Blunders

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>


Malcolm -

Good questions. What are these two mysterious R's of the Tesla coil
secondary circuit? What are their relationship to one another? The resonant
R appears to be about 10 times greater than the Q factor R. The interesting
part is that we have the equations to calculate these R's and the simple
schematic circuits  but sofar coilers have done little with them. These R's
mean losses and reducing them would increase TC performance.

You have made a large number of tests in the past with TC secondary coils
with and without toploads  and as I recall the resonant frequencies at low
voltage, low current agreed closely with the Wheeler/Medhurst/Freq
equations. I believe these were made with generator/scope/freq meter
connected to the base of the secondary coil. Did you find a difference in
resonant frequency when you tested these coils at high voltage, high current
operation using a scope and antenna probe?

John Couture

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Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<m.j.watts-at-massey.ac.nz>

Hi John,

On 29 Mar 01, at 16:54, Tesla list wrote:

> Original poster: "John H. Couture by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>


--------------------  snip


Wow! 35k Ohms. Is that effective series resistance or equivalent
shunt resistance? That can't be an unloaded measurement can it?
Does that figure include spark loading? I guess it must.

Regards,
malcolm