[TowerTalk] Tall verticals
Guy Olinger, K2AV
k2av@contesting.com
Fri, 7 Apr 2000 23:25:37 -0400
The trick is to split some PVC pipe, and wrap it around the boom where
it attaches to the tower/rotator/swing-gate and keep it insulated from
the tower. Add a little extra wrap to the coax going out and use a real
balun to keep the DE and anything it's attached to isolated from the
feedline. Only allow electrical connection to those things that you WANT
as additional loading.
Given the stuff you were talking about, a phase inversion was certainly
possible.
- - . . . . . . - - . . . . - - . . - . .
73, Guy
k2av@contesting.com
Apex, NC, USA
----- Original Message -----
From: <n4kg@juno.com>
To: <ni8l@raex.com>; <TOWERTALK@contesting.com>
Sent: Friday, April 07, 2000 9:50 PM
Subject: Re: [TowerTalk] Tall verticals
>
> I recommend against shunt feeding tall towers
> with side mounted antennas.
>
> I had a 130 ft R35 tower with a 3L15 on top and 3L20
> side mounted at 63 ft along with an 80M inverted vee
> at 110 ft. It worked on 160 but was noticably less
> competitive after I added the side mounted 3L20.
> I believe it altered the current flow in the tower and
> suspect there was a phase reversal in the upper
> half, partially cancelling the vertically polarized
> radiation.
>
> de Tom N4KG
>
>
> On Tue, 4 Apr 2000 20:57:58 -0400 "Scott Detloff K8DX" <ni8l@raex.com>
> writes:
> >
> > Would like to know if any one out there has any real world
> > experience with very tall verticals. I'm thinking about shunt
> > feeding a 170' tower that will have full-sized 3/3 on 40M.
> >
> > A few years ago I had a full-size quarter waver vertical for
> > 160M that was hung off this tower, just 60' away, and it was
> > a killer.
> >
> > Any ADVANTAGES to shunt feeding the tower, other than
> > getting 160M another 60' away from the 80M 4SQ? Any
> > disadvantages?
> >
> > 73...Scott K8DX
> >
> >
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