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Re: Spark gap resistance



Hi Bert, all,

> Original Poster: Bert Hickman <bert.hickman-at-aquila-dot-com>
> Barry and all,
> The "big Fleming book" is most likely "The Principles of Electric Wave
> Telegraphy and Telephony" by John Ambrose Fleming, Longmans, Green and
> Co.

Snip

> Zenneck found that the "equivalent" gap resistance, when the gap was
> predominant source of energy loss, was inversely proportional to the
> current (more current means lower Rg), directly proportional to the
> squareroot of the inductance (more inductance means higher Rg), and
> inversely proportional to the squareroot of the tank capacitance (more
> capacitance means less Rg).



I think you just found the true explanation why my low voltage driven
coil is a good performer. I just "happen" to fullfill everything Zenneck
finds to be "good" for low gap resistance. My primary current is ~
600A (will be 1.5kA in the full version), my cap is relatively big (67nF
for 7500V) and my primary inductance is pretty low at 23.44ÁH. So,
even though I am using a crude and cruddy 10 piece flat static gap
(with a seemingly high equivalent resistance) and a low voltage power
source, it is "compensated for" by the way I constructed the TC tank
circuit (i.e: high current and capacitance and low inductance).

Thanks for the insight.

Coiler greets from germany,
Reinhard

P.S.: I sure would love to "raid" your library ;o))!