Roy Lewallen wrote:
Of course it doesn't account for phase shifts of current, since there
aren't any.

You seem to be disagreeing with John Devoldere's "Bible" - "ON4UN's Low
Band DXing", 3rd Edition, on page 9-34 at:

http://www.k3bu.us/loadingcoils.htm

A little thought should prove there is a current phase shift (delay) through
the coil. Let's look at an 8 foot long center-loaded mobile antenna for 75m.
The 4 feet below the coil gives a phase shift of about 5 degrees. Assume zero
phase shift through the coil. The 4 feet above the coil gives a phase shift
of another 5 degrees for a total of 10 degrees at the end reflection point.
It's an open circuit, so a 180 degree phase shift takes place. That puts the
reflected current at 190 degrees. Add the 10 degrees coming back and we see
the reflected current arrives mostly out of phase with the forward current
at the feedpoint. Since the feedpoint impedance is known to be around 15 ohms,
these superposed currents cannot possibly be out of phase and must necessarily
be in phase.

The phase shift (delay) of the current simply cannot be the same with and
without the coil.
--
73, Cecil http://www.qsl.net/w5dxp



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