[TowerTalk] Tall verticals

[Michael Tope]

In his book on Low Band DXing, ON4UN details a method 
for choking off current below the feed point in a shunt fed
system (3rd ed, page 9-27). This approach could probably 
be used at the appropriate point along the length of a "too tall" 
system to form a trap (kinda a like the linear loading traps in 
a KLM KT-34).

Mike, W4EF............

----- Original Message ----- 
From: <n4kg@juno.com>
To: <ni8l@raex.com>; <TOWERTALK@contesting.com>
Sent: Friday, April 07, 2000 6:50 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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