Roy Lewallen wrote:
Do you have a quote showing exactly what Tom said, in context?

Here's one from his web page:

"What determines current distribution in a loading coil? The capacitance
to the outside world and the impedance above the loading coil. The current
in any inductor would be equal at each end except for displacement currents,
which are "imaginary currents" that flow through capacitance."

He completely ignores the fact that, for a standing-wave antenna, the net
current is the superposed phasor sum of the forward current and reflected
current and whatever phase shift occurs through the coil is doubled because
those two currents are traveling in opposite directions.

He is thinking lumped circuit model when he should be using a distributed
network model. What he says is reasonably accurate for a traveling-wave
antenna but certainly not for a standing-wave antenna.

EZNEC clearly illustrates the difference in the currents when the coil is
modeled as a coil of wire segments and not as a lumped inductor. Anyone who
would like a copy of the EZNEC file need only request it.
--
73, Cecil http://www.qsl.net/w5dxp



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