There's a small book (I'm not at home and can't remember the exact title,
something Ref--Ace Hardware used to have it) that has such a formula. You need
the cable diameter, the spool diameter, the spool thickness, and the number of
layers.
73,
Bill, K7EY
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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