LF: R: Loop Conductors and proximity effect Rdc Rac

["cesare tagliabue" <cestag@dada.it>]

        Hello John

        I have found the Mesny's _expression_ on an old university stenciled book where only the data were given, but some time ago, for purpose of include it in a program, I have elaborated an empiric _expression_ that approximates sufficiently these data. That is:

                                                 q = ( 1 + .95 d / D )^2 - .22 

Best 73 to all  Cesare

                              

Cesare Tagliabue   I 5 TGC
WW-Loc  JN53PS
e-mail: cestag@dada.it
url: http://www.dadacasa.com/i5tgc

-----Messaggio originale-----
Da: john sexton <computernetworks@excite.com>
A: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Data: lunedì 18 marzo 2002 17.46
Oggetto: LF: Loop Conductors and proximity effect Rdc Rac

Hi Paul,
From the interesting formula given by Cesare, the short answer to your question appears to be 1/2 inch.
I tried to find out more about Mesny's _expression_ from the Internet, but it looks like you have to buy the book.
I wonder whether Cesare can be persuaded to tell us the formula that relates q to D/d? At a guess it appears to be logarithmic.
The second formula can be simplified to
Reff/Rrf = 1 + (q-1)*sqrt(1-Rdc/Rrf)
When D/d = 9, q = 1 so the second term disappears and Reff = Rrf.
73, John, G4CNN

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