[TowerTalk] Radial systems

[Guy Olinger, K2AV]

I'm going to guess that it won't make any difference whether you connect
them or not, if the radials are bare wire or the ends are bare.

What does pop out, is that the 160,  and the 80 meter 4SQ are close
enough to foul each other's pattern. A little modeling is in order. If
you use EZNEC, then set the ground to REAL, MININEC, and just model the
distances and sizes and see if they interfere with one another. Some
solve the problem by putting the 160 meter vertical in the CENTER of the
80 meter 4 SQ. The 160 meter part can actually be tuned to slightly
improve patterns on 80 meters.

In any event, MODEL WHAT YOU ARE PLANNING.

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

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

----- Original Message -----
From: Pete Smith <n4zr@contesting.com>
To: Michael Tope <w4ef@pacbell.net>; Scott Detloff K8DX <ni8l@raex.com>;
<towertalk@contesting.com>
Sent: Sunday, April 02, 2000 8:02 AM
Subject: Re: [TowerTalk] Radial systems


>
> At 01:30 AM 4/2/00 -0800, Michael Tope wrote:
> >
> >Scott,
> >
> >I have been thinking about your problem a little,
> >but still not sure that I have a definitive answer.
> >In either case, you are going to have RF current
> >induced in the adjacent antenna (both in the
> >radiating element, and in the ground system), but
> >its not clear to me which case will produce
> >the greatest coupling. Its also possible that the
> >coupling between the transmit antenna, and the
> >adjacent antenna's radiating element will more
> >than swamp out any coupling between the TX
> >antenna and the adjacent radial system - but
> >I can't say for sure without doing some analysis.
>
> I guess I'd been assuming that Scott's radials were to be either
buried or
> effectively so -- lying on the surface of the ground.  In that case,
aren't
> they a lossy, non-resonant system whose only purpose is to improve the
> ground conductivity in the vicinity of the bases of the antennas?  And
if
> that's the case, why would connecting them together deliberately make
much
> difference as compared to having them share the same earth?
>
> I can see a potential problem with elevated, resonant radials (if that
was
> what we were talking about) ... or are we?
>
>
> 73, Pete Smith N4ZR
> n4zr@contesting.com
>
> Don't forget to update your entry on the World Contest Station
Database,
> now at www.contesting.com/stationdatabase.htm
>
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