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Re: [TowerTalk] Rohn AS25G inside a 25G tower

To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn AS25G inside a 25G tower
From: Steve Maki <lists@oakcom.org>
Date: Sun, 10 May 2015 17:18:57 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I lean toward mounting rotators a little further down in the tower, even just 2 or 3 feet further down. The top spot on R25 has no diagonals and it's a very weak point in any install that has much wind loading above the tower top. I've seen R25's fail right there.

If you select a location in the middle of the section, it's easy enough to fab a bolt-on replacement for whatever structural members are removed. This way rotator servicing is a breeze and the installation is much stronger.

-Steve K8LX

On 5/10/2015 2:44 PM, Roger (K8RI) on TT wrote:

Cutting a brace is not an option to me.  Why cut a brace which is
structural?   You are trying to fit a shelf or metal plate, which is not
structural, into a tower section.  It makes sense to cut the non
structural insert/shelf/plate.  I do remember that I could not insert
the rotator (Ham IV) between braces and had to lower it down through the
section while others could (It's in the archives), so there must be some
variability in the brace spacing, or 25G look alike towers.  In your
case if the rotator would not fit between the braces, you would need to
insert the rotator first (from the bottom of the section and move up the
section, then insert the shelf where it would fit modified if necessary
as I don't think  lowering from the top is not an option.

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