Jerry:
Where on the current Universal Tower web site did you find the 21sf at
110mph rating for the HD-21-50 rating? All they say there is if your antenna
is xx SF go down the list that has the same number or larger than the
antenna area I see no reference to wind velocity or what standard is used in
their rating of tower capacity. Am I missing something?
Regards
Lonberg Design Group, Ltd.
H. S. Lonberg, P.E.,S.E.
Principal
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of jerry@hagrid.xm23.net
Sent: Thursday, August 09, 2012 10:55 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Aluminum Towers
I plan to install a 50' tower and a tri-bander for 20/15/10 and was
originally considering a U.S. Towers 55' crank-up model. While researching
towers, I came across a company called Universal Towers that sells aluminum
free-standing towers.
Based on the specs, the Universal Towers HD-21-50 aluminum tower looks like
it might be a better fit for the following reasons:
* At $1989 it's $2K cheaper than the U.S. Tower crank-up
* It only weighs 190 pounds (spread over five 10' sections), versus >800 for
the crank-up, making it a lot easier to get off the truck with fewer people
* The base doesn't require a rebar cage, making installation simpler
* It won't rust
The HD-21-50 is rated at 21 sq.ft. at 110 MPH, while the U.S. Tower crank-up
is rated at 30 sq.ft. at 50 MPH.
The installation instructions for the aluminum tower says to assemble the
tower on the ground, attach the antenna(s), and then walk it up. In my case,
I don't have 50' of horizontal space to do this. Is it feasible to climb
this type of tower and assemble it vertically section-by-section with a gin
pole? (Whatever I put up will be installed by a professional tower
installer.)
Any reason why I shouldn't consider this aluminum free-standing tower?
- 73, Jerry
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