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Re: [TowerTalk] tower specs/not wind loads

To: "Steve Shelton" <>, <>
Subject: Re: [TowerTalk] tower specs/not wind loads
From: "K8RI on Tower talk" <>
Date: Tue, 24 Jan 2006 20:06:03 -0500
List-post: <>

> Hi, I am fairly new to towers and I have tried to research information
> on rohn's 25, 45 and 55 towers.  I have found quite a bit of information
> on these towers but not the exact answers that I am looking.  One of my
> questions is what is the maximum safe height on these three towers
> without guying?

I am only quoting figures. I am not making any recommdations.

According to the ROHN catalog I have in front of me.

Self supporting         2.3 safety factor
70 MPH,               34.1' *Recommended*

So ROHN recommends no more than 34.1' unguyed 25G and that is with a very 
small antenna.
Guyed the tower can go to 200 feet maximum.

45G  Self Supporting
70 MPH                 45.4' *Recommended*

45G Guyed to 300 feet maximum.

>How much weight can they handle guyed or unguyed? The

I did not find the ultimate loads listed in my old catalog nor does it list 

> reason I ask is that I do a lot of tower climbing and often run into a
> rohn 25 that is not guyed.  Most are only 40' but some as high as 80'

No way would I climb one higher than the recommended height or with an 
antenna larger than recommended for that height.

> and without guy wires these towers do a lot of swaying.  I would feel
> more comfortable on these particular towers if I knew for sure that an
> extra 200lbs harnessed to the side of this tower is not going to be the
> stick that broke that camels back.  Thank you for any information that
> you have.

I make no recommendations, but were it me (and it's not) as I said above, 
I'd not climb one taller than the recommended height. Nor would I climb a 
guyed tower that was at it's maximum rated height.  The thought of climbing 
200 feet of 25 G scares me.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2

> Steve
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