On Sun, 03 Apr 2005 00:53:34 GMT, "Tom Donaly"
wrote:

In order to use this formula,
you have to know the complex permeability of the ferrite coating.
I don't know how you'd measure that. Maybe Richard Clark knows.

Hi Tom,

I've measured a number of ferrites, but only in the HF region. They
do show a range of values, with most of them not very reactive (in
relation to the R).

73's
Richard Clark, KB7QHC