Re: Vertical antenna problem

neno wrote:
What do You suggest?
To cut only radials to 3.25m or vertical and radials to 4.7m?
What is better?

Or (3) you could leave the radials as they are
and shorten the vertical wire.

The physical environment will shift the
resonant frequency away from that predicted
by EZNEC as modeling is not an exact science.

Any of the three choices will work and none of
them will result in the exact resonant frequency
you desire. In the end, to get the frequency
exact, you will be required to "cut and try" in
an iterative process that often forces you to
add back one inch of the two inches you just
removed. :-)
--
73, Cecil http://www.w5dxp.com
.

Relevant Pages

  • Re: Vertical antenna problem
    ... To cut only radials to 3.25m or vertical and radials to 4.7m? ... by EZNEC as modeling is not an exact science. ... them will result in the exact resonant frequency ... Eznec was very helpful also. ...
    (rec.radio.amateur.antenna)
  • Re: 80m Inverted L Initial measurements
    ... >I do have correlation now. ... >with increasing numbers of radials.) ... The antenna is ground-mounted on a 16" square aluminum plate with ... bump in it and the resonant frequency is slightly off from the model. ...
    (rec.radio.amateur.antenna)
  • Re: HF-Ground
    ... > radials laid on the ground, or pinned to the ground as you describe, ... Once radials are buried in the ground, just below soil surface, I ... The input resistance at resonance is high. ... Resonant frequency increases with height due to the increase in VF. ...
    (rec.radio.amateur.antenna)
  • Re: Length & number of radials
    ... I ran the program for my 17M vertical wire I have added to the 5-btv.. ... If the Hustler 5-BTV has any loading coils in it then its efficiency ... the program only to illustrate how the radials affect efficiency. ...
    (rec.radio.amateur.equipment)