On Thu, 07 Apr 2005 09:09:51 -0500, Cecil Moore
wrote:

Reg Edwards wrote:
And, believe it or not, all is independent of the length of the line.

How much does an infinitessimally short
line radiate? :-)

Sterba and Feldman in "Transmission Lines for Short-Wave Radio
Systems", Proceedings of the IRE, Volume 20, No 7., July, 1932 give a
formula for the radiated power in a balanced line.

The line length *is* a factor, however, they give a simplified
approximation for the case of a length more than 20 times the line
spacing and the line spacing less than 1/10 lambda.

P/I^2 = 160 * ( pi * D / lambda)^2

whe

P is in watts

I is the RMS current in a matched line

D / lambda is the wire spacing in wavelengths