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>


Terry -

On Paul Nicholson's web page your coil is listed with a 310.9 Khz resonant
frequency. The Wheeler/Medhurst equations show this coil with a 345.86
resonant frequency. This is a reduction of
    (345.86 - 310.9)/345.86 = 10.1%
In the frequency equation the R = 43,393 ohms.
Did you find the 310.9 Khz with a scope and antenna probe when the coil was
operating?

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, March 29, 2001 6:58 AM
To: tesla-at-pupman-dot-com
Subject: Re: Tesla Coil Blunders


Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi,

In general, I have found the streamers load a TC to about 220K ohms plus
1pF/foot of arc length.  This lowers the secondary frequency about 5 to 7%.
 MicroSim modeling also demonstrates this effect of streamer loading.

Cheers,

	Terry


At 06:33 AM 3/29/2001 -0800, you wrote:
>more likely the detuning is due to the loading of the
sparks/corona/leaders.
>Signficant C (pf/cm) and significant R (tens to hundreds of K)

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