Ian White, G3SEK wrote:

Cecil Moore wrote:
OK, let's agree on that and take another look at the example I just
presented
on another thread involving half a dipole.

wire coil wire
---------------////---------------
22.5 deg ? deg 22.5 deg

Assuming a lumped inductance, presumably the current into the coil
will have the same phase as the current out of the coil. Zero phase
shift through the coil means this antenna has the same current phasing
as a 40m dipole used on 75m, i.e. the feedpoint current is at a current
minimum point.

Sorry, I don't understand that last statement...

A 40m 1/4WL vertical used on 40m is 90 degrees long.

A 40m 1/4WL vertical used on 80m is 45 degrees long and we know its characteristics.
If the coil above has zero phase shift, the antenna above is also 45 degrees
long and will exhibit the feedpoint characteristics of a 40m 1/4WL vertical
used on 80m but we know it doesn't exhibit those characteristics. ERGO,
the phase shift through the coil is not zero.
--
73, Cecil http://www.qsl.net/w5dxp



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