[TowerTalk] Utility Pole as Beam Support
Jim Thomson
jim.thom at telus.net
Wed Jun 4 03:21:25 EDT 2014
Date: Tue, 3 Jun 2014 15:15:05 -0700
From: "Clay Jackson" <n7qnm-lists at nwlink.com>
To: "'towertalk reflector'" <towertalk at 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
## telcos across north america all use the same formulae for depth into the ground.
10% + 2 feet. IE: For a 50 foot pole above the ground, you require 7 feet below the ground.
80 feet above ground means 10 feet below the ground. 40 foot above the grnd = 6 feet below the ground.
A 30 foot pole needs 5 feet below ground. That has not changed either, still used to this day.
Jim VE7RF
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