"Al Lorona" wrote in
:

Hi, Everybody,

A short vertical such as for mobile use is capacitive and this Xc is
usually tuned out with a shunt coil at the feedpoint. Yet, when I
model this with EZNEC I cannot simulate this effect properly. I must
be doing something wrong. Does anyone have an EZNEC example showing a
shunt matching coil inserted as an EZNEC Load at the feedpoint that
they can send me?

In my experience, the capacitive reactance of a short vertical is usually
"tuned out" with a series inductor (inductance and resistance).

If you do offset all of the reactance, you may have a very low feedpoint
resistance, and that may drive you to consider some form of L match at
the base, the L match formed by a radiator that is not resonated and some
shunt L or C element.

Owen


Thanks very much.

Regards,

Al W6LX