"Cecil Moore" wrote in news:JbR1g.62010$F_3.14225
@newssvr29.news.prodigy.net:

"John Ferrell" wrote:
I don't find the Helix feature in my copy of EZNEC+ V4.
I believe I can get the same results by inserting an appropriate load.
It will just be a little more cumbersome.

The helix feature is found under the Wires window under the create
menu. But it is somewhat complicated. A lumped inductance load
will get you started.

The problem with feeding an impedance of 1.2-j1400 ohms is
getting power into the antenna without dissipating most of it
in the matching network.

A funny anecdote comes to mind in this connection. I was trying
desperately to load a very short helical dipole on 40M and ended up
hooking it to my old Dentron 1KW matchbox to see if that could do
anything with it. Damn antenna loaded up perfectly. SWR at on the line
to the matchbox 1.1 to 1, good power transfer at 25 watts from the
exciter. So I went to listen with it. NOTHING! NADA! Not even a dit,
even though the big vertical array just hummed with CW signals on the
band. So I leaned over to check connections and darn near fried my hand
on the case of the Dentron. THAT'S where all the watts were going. Damn
tuner was loading its own case!

--
Dave Oldridge+
ICQ 1800667
VA7CZ