Richard Clark wrote:
On Thu, 10 Jul 2008 10:21:56 -0700 (PDT), Art Unwin
wrote:

Not that I have any confidence in Art's antenna design. But you wind a
cylinder with zip cord from left to right, with the left end pair being
the feed and the right pair shorted (as if a single 2W wire) then the
'return winding' will essentially be wrapped in the opposite direction.
Correct. And if zip wire is used then you are adding a lumped load
which is a violation with respect to equilibriu,

The zip cord is in true equilibrium for any winding. What you
describe is twisting and this violates equilibrium. That won't work,
and Guss has demonstrated this three centuries ago.

73's
Richard Clark, KB7QHC

Now wait just a minute, Richard. I think it may depend on the zip cord
you use. Some of the zip cord, when close wound, will have more
dielectric between the interturn wires than between the 2 wires of the
zip cord itself. Of course it _can_ be rebalanced if the air gap
impressed into the plastic during manufacturing is the correct depth.

tom
K0TAR