[TowerTalk] K8UR array - effect of ground

[Guy Olinger, K2AV]

I note in the vertical survey by Steve and Ward that all the antennas
had a dense ground screen underneath, including the so-called "vertical
dipole" types. I was surprised at rather decent results (for a
vertical).

I am going to HAVE to put my old Gap Titan over a good ground screen and
see how it plays. It might turn out to be a good SO2R antenna.

The deal with verticals has always been to get rid of the %##$&@!
losses.

- - . . .   . . . - -     .   . . .     - - .   . - . .

73, Guy
k2av@contesting.com
Apex, NC, USA

----- Original Message -----
From: Ken Hirschberg <calav@flash.net>
To: Pete Smith <n4zr@contesting.com>; <towertalk@contesting.com>
Sent: Wednesday, August 09, 2000 6:09 PM
Subject: Re: [TowerTalk] K8UR array - effect of ground


>
> Hello, Pete -
> I belive what's going on with the elevated radials is that they are OK
for the
> current return, but are inadequate as a ground screen against
near-field earth
> loss.
> 73, Ken K6HPX
>
> Pete Smith wrote:
>
> > I withdraw my earlier claim that radials have no effect.  I
revisited my
> > model and tested it with varying ground conductivities and
high-accuracy
> > calculation.  Even specifying merely very good soil (the highest
> > pre-figured value provided by EZNEC), gain improves by almost 2 dB
over the
> > same antenna modeled over "good" ground.
> >
> > Evidently, in my previous modeling I was using 4 elevated radials,
which
> > for some reason did not seem to give the same results... (and
that'll start
> > a fight...)
> >
> > 73, Pete Smith N4ZR
> >
> > The World Contest Station Database
> > is back up and running at
> > http://www.qsl.net/n4zr
> >
> > --
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