Re: Formula for self C of a Coil (not Medhurst)

• To: tesla-at-pupman-dot-com
• Subject: Re: Formula for self C of a Coil (not Medhurst)
• From: "Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 25 Apr 2000 18:32:50 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> 
I believe the formula actual produces a value that when used with the
> > inductance of a coil  correctly  calculates the resonance frequency but
> it
> > is not the self C of the coil.  Its just an imperical relation to
> calculate
> > Fr.

	Probably correct.  What is your definition of self C?  Normal
engineering use is that capacitance which produces the observed
self-resonant frequency of a coil well isolated from its surroundings. 
Look up original articles by Medhurst and Palermo, which are referenced
in the various editions of the "Radiotron Designer's Handbook".

Ed

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