Richard Clark wrote:

On Wed, 20 Oct 2004 04:49:52 GMT, "
wrote:


Actually I modelled the coil to
real world dimensions
with a NEC program with copious segments that supplied current levels at
multiple points
around each turn to get my answers which this thread now suggests that NEC
answers could me incorrect
thus I am following the thread but not partaking in it.


Hi Art,

Read the thread where it is correctly described and stick with a
winner. After all, the difference between the point inductor, and the
helical one offers barely half a dB difference in the outcome. No one
here could possibly measure that spread accurately (about the quarter
of the width of an S-Meter's needle).

73's
Richard Clark, KB7QHC

Hi Richard,
you've hit the nail squarely on the head. The validity of
the whole argument boils down to whether or not you can safely neglect
the effects of the physical dimensions of the inductor on the behavior
of the antenna. It looks to me as if you can, but some of the other
fellows on this newsgroup seem to be as much interested in
characterizing Tom Rauch as a rat as they are in verifying some
antenna effects due to the properties of real loading coils.
73,
Tom Donaly, KA6RUH