If I remember correctly, the manual for the Sigma V says
to run the coax away from the antenna at ~90degrees as
much as possible to prevent coupling.
I had one of these in the past and was always amazed at
how well it performed for such a small antenna.
Greg-AB7R
On Tue, 13 Jun 2006 11:14:40 -0700
Vic K2VCO <[EMAIL PROTECTED]> wrote:
Stuart Rohre wrote:
They are coax
fed,with bead chokes on the coax so that bringing off
the coax from the
center is not a problem.
This isn't true. The bead balun solves the problem of
current flow on the outside of the coax which occurs when
the feedline length is such that the outside of the coax
has a low impedance compared to the impedance of the line
(that is, the common mode impedance is not much higher
than the differential mode impedance). It does *not*
prevent imbalance caused by capacitive coupling between
the outside of the line and one of the legs of the
vertical dipole.
It's still a good idea to try to reduce such coupling.
Having said that, it probably doesn't matter much in
practice unless you run the coax parallel to the antenna
for some distance.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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