[TowerTalk] Re: NVIS Placement and Beam Sepearation

[David Colburn]

> That collection of aluminum and tower sounds like a pretty good
> pile of money.  For a small fraction of the cost of that hardware
> you can buy a copy of EZNEC (at http://eznec.com) and make
> a model of your setup.

I am trying to learn JAVA, PERL, CGI, LINUX and Ethernet all at the
same time for employment purposes, I figured adding learning EZNEC
to that might kill me!  ;-)  It is also my sense that many users
misunderstand
the EZNEC results, or mis-enter data, and end up having to get someone
more expert to run the numbers for them.  I'm sure I would be one of them!

Besides, I already own the tower (need to swap an extra top section
for another straight section), and I own the Mosley.  I will sell or swap
my T2X rotor and control for one of the Force 12 beams.  I do not
anticipate a large additional expenditure.

> I did a very quick test of a 80m dipole at 8' close (within 30') of
> a 1000' long line at 30' and the affect was profound (i.e. fouled up).
Gain
> goes up and down +/- 6db in various directions.

How about the bottom wire 300 feet long (a 160m dipole/doublet) at 8 feet
and the wires 22 feet above it only 150 feet long and to one side?  Your
test seems to obliterate your test dipole with a short antenna and long
wire above it -- my situation is the opposite.

The other option is I could move the NVIS and bend it at a right angle
at the corner of the property, 150 feet running S-N and 150 feet running
E-W (directions extending out from the feedpoint at the bend).  I imagine
that will impact the NVIS pattern in interesting ways ... ;-)

Thanks! & 73, DavidC  K1YP

> Regards,
> Pete
> KS4XG
>
>


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