Reg Edwards wrote:
On a long terminated non-resonant line I guess the current falls off
crudely exponentially at a rate of about 1 dB per wavelength.

Seems to me if we assume 1 dB per wavelength for both current
and voltage and knowing the feedpoint impedance of a one WL
dipole, we could calculate the characteristic impedance of
the antenna at the feedpoint.

Seems to me it would be essentially the same calculation as
for a 1/2WL open-circuit stub where the transmission line has
losses of 1 dB per wavelength and we measure a stub impedance
of 5000 ohms. We could calculate the Z0 of the stub.

Couldn't we use a TDR to measure the loss in an open-ended
1/2WL piece of wire?
--
73, Cecil http://www.qsl.net/w5dxp


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