[TowerTalk] Rohn 25 as a boom pole

[Hector Garcia XE2K]

Bruce

I just take a look at your photos, those ubiquiti looking equipment  is very 
light for sure, pure plastic, will be no problem  in the wind load,
from my point of view the  120 pound extra weight  for the top section of the 
tower looks no problem, if you secure  all the sections with clamps(big, no 
hardware store u bolts)
and add  the several sets of guy wires to be called "safe"  to use, BUT  I can 
see you need to clean your forest near the tower to install the  guy wires, 
leaving those guy 

wires ready to be vandalized and you tower fail , if not a  wind or storm breaks 
several trees and your tower fail.

If you want more height play with the mast you have there , raise it the most 
you can and add a set  guy wires  from the mid section of your mast to  a 
horizontal pipe and anchor the other end at the tower, the same distance  and  
this will reinforce it like the old TV mast or towers in the  50-60's  use it 
that looks like  rhomboid and those will  work to keep it stable  and are  from 
my opinion better for you,  have no exact name in english for that set up, hope 
some one can provide the name or the idea better.

Play safe and keep your customers with service all the time
 

 J.Hector Garcia  XE2K / AD6D
Mexicali B.C  DM22fp
P.O.Box 73 
El Centro CA 92244-0073
http://xe2k.net







________________________________
From: Bruce Ward <Bruce at IPIntel.com>
To: towertalk at contesting.com
Sent: Sun, May 6, 2012 11:24:09 AM
Subject: Re: [TowerTalk] Rohn 25 as a boom pole

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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