[TowerTalk] Max Unguyed Rohn 25 height to support dipole end

Jim Lux jimlux at earthlink.net
Fri Nov 10 21:00:28 EST 2006


At 04:12 PM 11/10/2006, you wrote:
>Gents,
>
>I have a pile of Rohn 25 that I'd like to use to support the ends of a 160
>mtr dipole.
>
>No other load other than the tower itself.
>
>The center is supported by a TriEx freestanding tower.
>
>What's the max height I can realistically go unguyed since I don't have room
>for guys?


Using the handy equations at http://home.earthlink.net/~w6rmk/math/catenary.htm
or, more particularly, the 40m example at the bottom of the page and 
scaling up...
assuming you use AWG 12 copper wire, and allow it to sag a foot in 
the 130 foot span, the tension is about 42 lbs.

Now you have to look up the max load the Rohn25 can support with a 42 
pound load (plus any wind load)





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