On 10 May 2007 18:28:38 -0700, art wrote:

Shame that they didn't introduce modern math
some 50 years ago which would have shortened this thread by 90%.

Hi Art,

You will have to go back nearly three times that many years, 1864 - to
Maxwell once again.
The quantity eta is called the intrinsic impedance or wave impedance
of the material.....".
120 * pi (roughly 377) Ohms is a fact of nature.

73's
Richard Clark, KB7QHC