[TheForge] somewhat off topic: antenna tower

Sat Feb 9 11:01:39 2002

I don't know anything about towers personally, but you might try the
windgenerator alternative energy folks for advice. They put up all sorts of
towers.

----- Original Message -----
From: Larry <[email protected]>
To: <[email protected]>
Sent: Saturday, February 09, 2002 9:17 AM
Subject: Re: [TheForge] somewhat off topic: antenna tower

> IMHO Terry,
>     To put up such a pole without guy wires is asking for a disaster.
Aside from
> the fact that it may come crashing down, how about maintenance?  Will you
lower and
> raise it each time the antenna needs work?  I have worked on a number of
towers and
> would not recommend 100 ft of "Push-up Pole".  As to a Rohn tower, you
should be
> able to get that height with out spending a bundle.  I think a Rohn 25G
properly
> guyed would be you safest bet.   The Guys can have a net or streamers
attached at
> eye level to warn people of their presence.
>
> Larry
>
> [email protected] wrote:
>
> > hello;
> >
> > i have searched the amatuer radio pages and have found alot about
> > antenna but nearly nothing about building a tower. the little
information
> > i did find was assuming a large antenna with high wind loading.
> >
> > basically what i want to do is build a 100 ft tall monopole tower.
> > the only antenna on this tower is a 24 db gain parabolic dish microwave
> > antenna. the wind loading is slight since it is a wired grid design.
> > (
> > if you are interested the antenna may be seen at:
> > http://www.hyperlinktech.com/web/hg2424g.html
> > )
> >
> > one person suggested i get an aluminum flag pole. hey right they cost
about
> > the same as a self supporting tower not including the foundation work.
> >
> > rohn self-supporting towers cost $10K+. that is way out of my price
range.
> >
> > i thought of using schedule 80 pipe and start out with 8 in pipe.
> > use an 8 inch to 6 inch reducer. go with 6 inch for 40 ft and then
reduce
> > down to 4 inch for 20 ft then end in 2 inch.
> >
> >          |  |    <---- 20 ft of 2 inch
> >          |  |
> >          |  |
> >          |  |
> >         /    \ <---- 4 inch to 2 inch reducer
> >         |    |   <---- 20 ft of 4 inch
> >         |    |
> >         |    |
> >         |    |
> >        /      \ <---- 6 inch to 4 inch reducer
> >        |      |  <---- 20 ft of 6 inch
> >        |      |
> >        |      |
> >        |      |
> >       /        \ <---- 8 inch to 6 inch reducer
> >       |        | <---- 20 ft of 8 inch
> >       |        |
> >       |        |
> >       |        |
> >
> > i am unable to find my copy of the machnist handbook to look up the
weight
> > of each section, so i have no good feel for what it would weigh nor what
kind
> > of foundation should it have. it does seem to be over kill for such a
small
> > antenna. the only experience i have to go by is when i worked on putting
in
> > cellular towers. some of those had 50 ft deep 4 feet diameter concrete
piers.
> > with 20 ft long 4 inch bolts embedded in the concrete.
> >
> > aluminum schedule 80 pipe cost more than steel schedule 80 pipe.
> > there are benefits to using aluminum such as weighs less, will not rust.
> >
> > the reason for building a new tower is the current tower is a rohn 25gt.
> > it is next to the house. ( i know bad place to put it. ) at 40 ft it
does not
> > need guy wires at 100 ft it need three guy wires per leg. the family has
voiced
> > rather loudly that they do not want guy wired. i do not like guy wires
either
> > for safety reasons. people get 'clotheslined' by them.
> >
> > --
> > Terry L. Ridder
> > Blue Danube Artistic Forge (Blaue Donau Kunstschmiede)
> > "We do not bend metal, we sculpt it."
> >
> > digging deep, i feel my conscience burn
> > i need to know who and what i am
> > this hunger jolts me from complacency
> > rocks me, makes me meet myself
> > ----kendall payne---closer to myself---
> >
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