Re: Input impedance

• To: tesla-at-pupman-dot-com
• Subject: Re: Input impedance
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sun, 07 Feb 1999 20:21:05 -0700
• Approved: twf-at-verinet-dot-com

Hi Gary,

> Original Poster: Gary Johnson <gjohnson-at-ksu.edu> 
 
<snip> 
> There are many unanswered questions about input impedance.  You notice that
> the paper just ended, without a conclusion.  As I have some more thoughts on
> the subject, I will write another paper (Input Impedance, Part II).  It is
> quite possible that the one coil I measured is some sort of freak.  I am
> looking at other coils now, to see if there are any patterns.

I don't think so. I was part of a discussion several years ago on 
base impedance when viewed as a 1/4 wave line. I'm sure I'm far from 
being the first too. I you take the Zo^2 = Zbase*Ztop relationship 
and plug your measured figures in you can see the expected high 
impedance of the corona discharge pop out. I assume without 
corroborating measurement that Zo = SQRT(L/C). It may be that 
Schelkunhoff comes closer. Something to check sometime. 
    I measured such impedance changes on a link coupled coil several 
years ago with artificial terminations.

Malcolm

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