Re: Capacitance of a coil

• To: tesla-at-pupman-dot-com
• Subject: Re: Capacitance of a coil
• From: Hollmike-at-aol-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sun, 17 Jan 1999 15:19:00 -0700
• Approved: twf-at-verinet-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

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