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Quarter Wave Calculations, HELP!!!
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, April 16, 1998 2:38 PM
To: Tesla List
Subject: Re: Quarter Wave Calculations, HELP!!!
Hi Andrew,
First off, would you please insert the odd carriage
return. Ireceived your message truncated to a single line of ???
characters.
> From: Andrew Chin [SMTP:chinny-at-ozemail-dot-com.au]
> Sent: Wednesday, April 15, 1998 2:22 PM
> To: 'Tesla List'
> Subject: RE: Quarter Wave Calculations, HELP!!!
>
> I simply used a physics formula Frequency = Speed of light /
> Wavelength. In the case of a quarter wavelength tesla coil, the
> wavelength in this case would be 4 times the length of wire used
> to wind
The length of wire won't correspond with the coil self-F like that
i.e. a bare resonator will never resonate at a frequency such that
the wire is 1/4 wavelength long in it. You can do it by adding the
correct amount of Ctop but I haven't yet seen any good reason to do
so (other than providing some top energy storage). If you don't
believe me, measure all of your resonators without a topload. Just
use Wheeler's L formula and Medhurst's C formula to predict your
coil's frequency.
Malcolm