Re: EZNEC Example of Short Vertical w/ Matching Coil

On Sun, 29 Apr 2007 23:41:13 -0700, "Al Lorona"
<al_lorona@xxxxxxxxxxx> wrote:

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?

Thanks very much.

Regards,

Al W6LX



FWIW, I use the information provided by EZNEC as input to the TLW
program (ARRL Antenna Book) for this set of conditions.

Note that radiation from the matching device is ignored under this
circumstance.

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"
.

Relevant Pages

  • EZNEC Example of Short Vertical w/ Matching Coil
    ... A short vertical such as for mobile use is capacitive and this Xc is usually ... tuned out with a shunt coil at the feedpoint. ... EZNEC I cannot simulate this effect properly. ... inserted as an EZNEC Load at the feedpoint that they can send me? ...
    (rec.radio.amateur.antenna)
  • Re: EZNEC Example of Short Vertical w/ Matching Coil
    ... usually tuned out with a shunt coil at the feedpoint. ... model this with EZNEC I cannot simulate this effect properly. ...
    (rec.radio.amateur.antenna)
  • Re: EZNEC Example of Short Vertical w/ Matching Coil
    ... tuned out with a shunt coil at the feedpoint. ... EZNEC I cannot simulate this effect properly. ... Does anyone have an EZNEC example showing a shunt matching coil ... inserted as an EZNEC Load at the feedpoint that they can send me? ...
    (rec.radio.amateur.antenna)
  • Feedpoint of a Half Square
    ... For years I've always fed my 30 meter Half Square at a top corner, ... done a reasonable job in my opinion. ... Recently I've discovered 2 Eznec files, ... Both show the feedpoint down just a little bit on the driven element ...
    (rec.radio.amateur.antenna)
  • Re: Feedpoint of a Half Square
    ... done a reasonable job in my opinion. ... I've studied both Eznec model outputs and indeed the different feedpoint does show a little more gain, about 1.5 DB without altering the antenna impedance much. ... as long as you didn't violate any of the EZNEC guide lines. ...
    (rec.radio.amateur.antenna)