[TowerTalk] Tower base
n4zr at contesting.com
Tue Aug 29 17:01:19 EDT 2006
Good point, Bill. However, my first guy set is at 31 feet - if my tower was Rohn 45, or even 55, and the base weren't set among 50-foot trees, I'd be tempted just to leave the first set in place, slide any antenna to be raised up the bottom guy set till it reached the tower, and then pull straight up from there. However, I wouldn't try that with 25 - even 30 unguyed feet just moves too much for my taste when I'm at the top.
As it is, I need about a 200-foot tram to get things out where there is a good landing area.
73, Pete N4ZRAt 04:43 PM 8/29/2006, K4XS wrote:
>In a message dated 8/29/2006 8:30:16 P.M. Greenwich Standard Time,
>n4zr at contesting.com writes:
>K7NV did a computational study some years ago to compare pier pin versus
>fixed base construction, and found some circumstances, IIRC, where the fixed
>base would cause failure in the first section at a lower wind speed than if an
>ideal pier pin were used.
>However,one overlooked advantage of having a stick in the ground opposed to
>pier pin is the ability to drop the guys at any time (or having them fail from
> an accident like heavy machinery snapping them as happened once on one of my
> towers) and still have a standing tower.
>Guys with modest height Rohn 45 and 55 have the advantage of just hauling an
>antenna up the side of the tower to the top after dropping the guys and then
>replacing them before anyone goes back up the tower to put the antenna in its
> final spot....can't be done with a pier pin! It sure beats assembling an
>antenna on the tower or having to rig a tram.
>I have, as a one man operation, raised a 40 meter KLM 4 el Yagi in this
>fashion to 90 feet many times. Of course, you can't be stupid about it. Raising
>it on a day Ernesto is expected is a no-no.
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