[TowerTalk] Tall verticals

[n4kg@juno.com]

You didn't say what antenna would be on top.

My TH7 looks like approximately 40 ft of additional
effective height on top of a 40 ft tower.  If your
tribander is equivalent, then your tower is at least
equal to a 115 ft vertical, ignoring what the lower
beam does to the current distribution.  On 160M
the lower antenna probably won't have much effect.
On 80M, I would expect it to be destructive which
is why I recommended a separate vertical as far
as possible from the tower.

de  Tom  N4KG


On Wed, 10 May 2000 09:56:43 -0400 "DavidC" <eDoc@netzero.net> writes:
> > > You specified "tall" towers.  What about a 65 foot Rohn 45
> > > tower with tri-banders at 45 and 70 feet?  Would the side-
> > > mounted beam problem be as pronounced on that?
> > > 
> > Probably NOT.  It should work OK on 160.
> > Forget 80M.  Use a separate vertical.
> 
> So, it would be about a 1/8 wave on 160?
> 
> Why would it not work as a 1/4 wave on 80m?
> 
> If I insulate the side-mounted beam by covering the mast with
> PVC will its proximity, even if electrically islolated, cause a 
> problem?
> 
> 80m is far more important to me for emergency communications
> than is 160m.  Are there changes in the configuration of the 
> tower and antennas that would make it more suitable to 80m
> use?  Must I eliminate the side-mounted beam entirely?
> 
> > > I want to load it for 80m and want to make some choices
> > > about the type of base I use, where and how I side-mount 
> > > antennas and anything else that may impact performance on 
> > > 80m.  I have the tower but the pouring of the base has yet
> > > to be scheduled.
> 
> - Thanks! & 73, DavidC  K1YP in Hudson, FL
> 
>
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