[TowerTalk] Is there a decent way to fit a prop pitch in Rohn 25tower?

[Larry stowell]

I wonder if this would be a good application for the Green Heron controller. The new one with its
software setup is so smooth. I'm using it on an aluminum crank-p with a Yaesu 2800 and it hardly
moves the tower starting or stopping.

Larry K1ZW

-----Original Message-----
From: towertalk-bounces at contesting.com [mailto:towertalk-bounces at contesting.com] On Behalf Of Hardy
Landskov
Sent: Tuesday, February 05, 2008 5:03 PM
To: Rob Frohne; towertalk
Subject: Re: [TowerTalk] Is there a decent way to fit a prop pitch in Rohn 25tower?

What I would be afraid of is the Rohn 25 top section failing after a period of time because of the
tower section twisting that will occur each time you start the prop pitch. I have about 22 sq ft on
AB105 which is 24+ inches on a side and the starting torque and resulting tower twist is
significant. I did not realize it but I was on the tower one time and had someone in the
shack turn the antenna!   I have the top set of guys 10 feet below the top
of the tower so I can tram antennas up and down.
 Maybe someone can chime in and set us straight on this because I have been turning this antenna for
about 20 years.
GL N7RT

At 02:52 PM 2/5/2008 -0800, Rob Frohne wrote:
>Hi,
>
>I am having difficulty finding 100 feet of Rohn 45 or larger tower in 
>the neighborhood of Walla Walla, Washington, but I can find heaps of 
>Rohn 25 tower.  I am considering putting a shorty 40 and a 4 element 
>Steppir on top.  The wind loading specs of 25G and 45G are not that 
>different if you believe Rohn.  The big thing is that I would like to 
>use my prop pitch to turn the antennas, and I'm afraid I can't fit it.
>There are three top sections available for Rohn 25G.  
>
>http://www.criticaltowers.com/ROHN%20Industries/Media/pdfs/25G/25G-11.p
>df
>
>My prop pitch is the small size one I believe like those in this photo 
>without the mast adapter:
>
>http://www.k7nv.com/proppitch/09a902c0.jpg
>
>Is there a way to fit this into a Rohn 25 tower so I can also remove it 
>for maintenance without disassembling the tower.  I do have access to a
>25AG1 section of Rohn 25 tower, but it is at 90 feet in the air, and I 
>don't really feel like wrestling this thing up there and fiddling with 
>it at that height just to find out if it will work when I'm sure 
>someone must have already done it on the ground.
>
>Thanks & 73,
>
>Rob, KL7NA
>
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