On Apr 20, 4:07*pm, Cecil Moore wrote:
Art Unwin wrote:
Kraus states that for a helix one should not use wire shorter than two
wavelength which I suspect is a substitute calculation for the VF
change from a straight radiator.

Because of adjacent coil coupling, it takes
more wire to achieve the phase shift effect
of a straight wire.
--
73, Cecil, IEEE, OOTC, *http://www.w5dxp.com

Which is what I have always maintained, lumped loads are not included
in Maxwell's
equations .
Art