[TowerTalk] 43 feet pole for vertical

[K8RI]

On 10/31/2012 11:00 PM, Hans Hammarquist wrote:
> I was wondering if someone has experience with a 43 foot vertical, mounted on top of a

tower. I used one before on top of my roof, but that one was supported 
with simple guy wires.

  Needless to say that is not easy to do if I put it on top of my tower 
(85 feet tall).

Any suggestion? Maybe it is a very stupid idea?

Guying at 80 feet is almost as simple as guying when on the roof. I 
assume the tower is solid so use the same anchor points on the vertical 
as you would on the roof. It's just the ground guy anchor points have to 
be farther out.

It only takes some simple trig to calculate the length of the guys 
assuming the yard is farily close to level.  Use single or doubly braid 
poly.  1/8" is strong enough to anchor about 3/4 the way up the antenna.

If the tower is 80 feet and the antenna is 43 then 2/3rds of 43 is 
roughly 28.6 feet (give or take a foot or two) So the height is 80 + 
28.8 is 108 feet.  If the distance from the tower to the guy anchor is 
80 feet then sqrt(108^2 + 80^2) and I don't have a calculator in there 
to run that last square root.

I'd use double braided poly on the vertical and probably Phyllistran on 
the tower. However I think the 43 foot vertical is going to need radials 
so I'd use steel for those.  I've done that with a 40 tower and 33 foot 
vertical and it worked just fine. I only used 4 radials but was pleased 
with the results. Course that was back in the late 60's until about 1980.

73

Roger (K8RI)




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> Hans - N2JFS
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