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Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G

To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G
From: Steve Maki <lists@oakcom.org>
Date: Wed, 20 Jul 2016 17:34:01 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 7/20/2016 17:26 PM, Bill Tippett wrote:
K8RI:  > A heavy duty rotator with a large antenna should be mounted well
down into the tower. Mounted at the top, in the tapered section would
likely put very high stress at that point.

I mounted my rotator at the same point in 45G and had no problems for >10
years with the antennas/wind speeds in Colorado described previously.  If
still concerned, you could mount a straight 25G section above a straight
25AG4 and install the rotator in the 16" window.  Of course this would
require a long mast (~15').  I don't know which LPDA Jeff is considering
but I doubt it's >32 sq. ft.

And besides, the rotational torque will be resisted by z-braced sections below the rotator.

The only concern with the normal R25 rotator mounting position is lateral loads encountered with tall masts. I've seen pointy top sections fold over in that scenario.

-Steve K8LX

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