[TowerTalk] Rohn AS25G inside a 25G tower

[Steve Maki]

I must have missed the permit aspect, that brings another dimension into 
it. I was thinking only about strength and ease of installation and 
maintenance, which is all I ever think about on my own stuff.

-Steve K8LX


On 5/11/2015 8:28 AM, Bry Carling AF4K wrote:

> I agree with Roger. I have a permit to pass here and the inspection will not look kindly on a
> Tower that has been cut and modified I am sure. It's simple enough to go buy a longer mast.

>> 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.

>>> 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.