Richard Harrison wrote:
One could reason that 1/4-wave back from the open-circuit end of an
antenna element a low-impedance high-current point is created. Since the
function of a loading coil is usually to supply the missing part of a
1/4-wave in a shortened element, one would expect to find the
high-current terminal of the coil facing the transmitter and the low
current end of the coil facing the open-circuit end of the element.

I've posted the 'sqcoil.ez' file to my web site that shows low current into
the bottom of the coil and high current out of the top of the coil. The
radiation pattern shows why that configuration is unpopular - mostly
a cloud warmer with a take-off-angle of 48 degrees at 14.7 MHz.

However, when 'sqcoil.ez' is run at 29.4 MHz, it turns into a phased array
with close to 180 degrees of phase-reversal in the coil and an omni-
directional gain of 3+ dBi at a take-off-angle of 12 degrees.
--
73, Cecil http://www.qsl.net/w5dxp/sqcoil.ez



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