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Re: Capacitance of a coil
Tesla List wrote:
>
> Original Poster: Hollmike-at-aol-dot-com
>
> In a message dated 1/17/99 3:46:55 AM Mountain Standard Time,
tesla-at-pupman-dot-com
> writes:
>
> > Mike,
> >
> > The winding length of the coil is not a parameter in this equation??
> > When I use Medhurst's formula on my 10" coil, I come very close (15.88
> > pF) to the measured value (based on reverse calculating from Ls and Fo).
> > However, if I use the above formula, I only get 3.88 pF.
> Bert,
> Just out of curiosity, what is the H/D of your coil(or the one you
did the
> calc for)?
> If it is about 4, then maybe this expression just needs that factor
included,
> since as I posted earlier, that it was meant for coils with H/D = 1.
>
> Mike
Mike,
The H/D for my coil is 31/10.25 or 3.02. Didn't catch the part about H/D
~ 1...
-- Bert --