On Mon, 25 Sep 2006 11:19:25 -0700, Richard Clark
wrote:
A Stub Fed Doublet. A Stub Fed Dipole. A Stub Fed Short Dipole. A
Stub Fed Short Dipole with End Loading. Take your pick.

I think I prefer "Stub Fed Doublet".

Several comments. What's with the curious cogging of the SWR computed
from NEC2? EZNEC predicts a quite smooth curve. Your measured values

I was also wondering about that. The SWR values are computed by
xnecview. It is conceivable that the choppiness of the curve is due
to numerical stability issues, e.g., using the difference of 2 small
numbers. Tonight I will dig out the xnecview source code and
investigate further.

suggest nearby losses. What do you do to snub common mode currents of
the nearby transmission line that is precariously close, and co-linear
with the polarization of your vertical dipole?

For the prototype, I tried to run the coax perpendicular to the
polarization to minimize the issue. Eventually I will use something
like a 1-1 choke balun. In fact, at the bottom of the web page I
suggest that something like that should be used. Of course I am
open to other suggestions.

Thanks,
--John