[TowerTalk] Rohn 25 as a boom pole

[Bruce Ward]

PS, I have pictures of the tower online at 
http://pics.2ward.com/family/index.php?ALBUM=Tower



On 05/06/2012 01:19 PM, Bruce Ward wrote:
> Has anyone used Rohn 25 section(s) instead of a boom pole on top of a
> larger tower?
>
> I have a  Tri-EX HZN 471 that the previous owner configured to lift to
> 66' instead of the factory 71'.  He also used a 2" diameter boom pole
> extending about 18' above the top of the tower with a large antenna on
> top of that.
>
> I have erected the tower and discovered it would be better if I could
> obtain some additional height.  I am placing around 3 square feet of
> antenna load on the tower.
>
> I am considering the possibility of removing the top bearing, installing
> a Rohn 25 base plate then installing 3 sections of Rohn 25.  I would
> also add a second set of guys at the top of the Tri-EX and  secure the
> retractable sections to each other to limit rocking between them.
>
> I believe the wind load produced by the Rohn 25 would be similar to that
> of the 2" boom pole and that my total wind load would be far less than
> had been placed on the tower for the last 35 years.  By securing
> (clamping) the retractable sections and adding an additional set of guys
> I believe the tower would be much stronger than the original design.
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