In a message dated 12/8/2005 9:30:42 A.M. Central Standard Time,
k6ll@adelphia.net writes:
----- Original Message -----
From: "Mike Bragassa" <bragassa@consolidated.net>
To: <towertalk@contesting.com>
Sent: Thursday, December 08, 2005 12:25 PM
Subject: [TowerTalk] Rohn Fold-over?
>
> I recently acquired a Rohn 25G 50 foot fold-over tower. I thought
> about using it at a place where I may have to be content w/ a lower
> height tower.
> I cannot seem to find any data on the tower and am curious from the
> reflector group, if anyone has experience w/ the tower and what
> compromises there are VS: a conventional stacked 25G tower, e.g how
> big of antenna's or stacking?
-----------------------
I've had one of these up for 28 years now.
Data is in the Rohn catalog.
The main disadvantage is the 130 pound weight limit at the apex of the
tower. Four way guying is required, but the footprint is small. Use
two levels of guys.
The Apex is 25.5 feet above the hinge, which means the safe "moment
about the hinge" is 3315 ft-lbs (25.5' x 130#). If you are placing
antennas, rotators, masts, etc. at other than the apex, you can add up
all their individual moments about the hinge, and make sure the total
doesn't exceed 3315 ft-lbs.
Dave Hachadorian, K6LL
Yuma, AZ
Dave is right on the money here! I have seen many foldover tower failures
(it is not a pretty sight) through the years due to this limitation and now the
busted parts are irreplaceable!
73,
Gerald Williamson K5GW
Texas Towers
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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