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[TowerTalk] Rohn 25 Tower Installation Questions

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Subject: [TowerTalk] Rohn 25 Tower Installation Questions
From: (
Date: Tue, 4 Sep 2001 12:30:12 -0600
On Tue, 4 Sep 2001 Jon Ogden <> writes:
> It's a split level.  The edge of the roof is perhaps around 15 feet 
> above the ground.
> >     You need to have the guys as close to 120 degrees 
> >     apart as possible.
> OK.  That's what I figured.  So even though I will have shorter guy 
> wires and steeper angles on them, that's OK.  Correct?

        Correct.  Since you are only going to 50 ft with
        a relatively small antenna load, steeper guys is
        *probably* not a problem.  (How steep will the
        angle be?  Anything over 30 degrees from the tower 
        is not a problem. Evan at 10 degrees, the guy load is
        5.6 times the lateral load (300 lbs for 10 sq ft load
        at 30 psf wind force which is 86.6 MPH).  This is
        roughly 1600 lbs of guy tension, well under the 
        4000 lb breaking strength of 3/16 inch EHS guys
        and well under the maximum vertical load rating
        for R25.       N4KG     
> Well, we've done a couple and the darn things just don't want to fit
> together too well.  Diffculty lining them up, etc.  I am afraid that 
> once I slip them together, they won't come apart very easily.  Any 
> suggestions for making sections slide together more easily?  
> WD-40 or some other  lubricant?

        Get a piece of 1 inch pipe.  That should fit loosely 
        inside the legs of the R25.  Another piece of 1.25 inch
        pipe can be used for the swagged ends. (I have used
        a tower leg for this application). Lay the section on the 
        ground.         Have someone stand on   the tower legs and use 
        the pipe to 'adjust' the position of the upper leg until a 
        good fit is achieved.  Use some all weather grease on the 
        swagged ends to facilitate assembly and later removal.   

> > > 2.) Is there anything I can use as a substitute for a gin 
> > pole or do  I need to find one to borrow or purchase?
> > 
> >     A gin pole is the SAFE way to proceed.
> >     See Rohn, WB0W, or make your own.
> That's what I figured.  I've thought about making my own, but wonder 
> if it's just better to invest in a good ready made one.  Anyone have
> links or> anything to plans for making your own?

        The Rohn gin poles are pretty expensive.
        WB0W gin poles are about half that.
        Home brewing is probably not a good idea
        if you don't understand the forces and risks.
        That would take more of an explanation than
        I want to type out.  Sorry.  Tom  N4KG

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