On 6/4/2014 3:31 AM, Jim Thomson wrote:
Date: Tue, 3 Jun 2014 15:15:05 -0700
From: "Clay Jackson" <n7qnm-lists@nwlink.com>
To: "'towertalk reflector'" <towertalk@contesting.com>
Subject: [TowerTalk] Utility Pole as Beam Support
I just "inherited" a 50' (out of the ground, 6' buried) utility pole (crew
was taking it out and told me that if I'd drag it off the road, I could have
it).
I'm thinking about trying to find a rotator and tri-bander to put on top of
it; but, having no experience with such a setup; I thought I'd seek some
advice first.
So, a few questions.
I'm sure someone has done this before; would you be able to share your
experiences?
I have a friend who can weld anything from steel to aluminum and so I think
we can fab up a mount for the rotor.
Beyond that, thoughts would be appreciated on things like:
Wind loading - how many sq ft (if any) is reasonable before I have to use
guys (for my HyGain AV18HT the building dept made me engineer the base for
90K winds, WITH a "wet stamped" drawing)?
Base - is a 6' hole filled with dirt "good enough" or do I need something
more (if more, would a 6' hole with concrete be sufficient)?
Thanks in advance!
Clay
N7QNM
## check out old TELREX catalogues. They depicted a setup with 3 x stacked
yagis, for
20-15-10m on a utility pole. It used steel shelves, each like a huge L,
bolted to the pole.
Two thrust bearings and the rotor. 3 x shelves in all. The shelves were
designed to factor in
the taper of the pole.....so the mast that went through the 3 x shelves..all
lined up.
What I've seen were A bracket to hold the rotator and a about a 10' mast
run through a pair of simple sleeve bearings. All side mounted. The
rotator mount and bearing mounts have to allow for a lot of adjustment
in the lateral plane so they can be aligned while keeping the mast vertical.
73
Roger (K8RI)
# I doubt rohn 25 would fit over a standard utility pole. Rohn 45 might just
fit. Or just custom make a
section to fit the top of the pole. After all the custom fabrication, cranes
to lift the heavy pole, tamping down the
fill in 4-6 inch lifts, etc.... you might be better off to just install a
freestanding tower, like a rohn hbx..or a trylon.
6-7 x 8 foot sections. Watch out, a 50 foot utility pole weighs one helluva
lot ! Its not to be trifled with.
Jim VE7RF
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