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Re: [TowerTalk] Planning New Tower

Subject: Re: [TowerTalk] Planning New Tower
Date: Mon, 17 Mar 2008 06:54:36 EDT
List-post: <">>
In a message dated 3/16/2008 4:30:05 P.M. Pacific Daylight Time, writes:

>  I am starting the planning phase of my tower. I am thinking  of installing 
a Texas Towers HDX-589MDPL crank up tower. I would like to put a  MonstIR 
beam on it. I am concerned with the windloading - fully extended I  don't think 
that I have enough safety margin - I believe that the Steppir has  a windload 
of around 30sq feet.

    First, Texas Towers is a dealer for US Tower, the  manufacturer. 
    You are well advised to be skeptical. Wake County  is a 75 MPH windspeed 
zone (from _ 
( ).  Crank-ups return moderate 
windloading for their 
high cost. 

>   Can I guy this tower at the top to get a better wind loading 
    No. You cannot put any more tension on the  tower/cables with guys. 
>  or should I leave it at say 50 of 60 feet most of the time?  

That would get you lots more capacity but at a  height that would only have 
negative effects on your MonstIR performance.  

I guess my question is why spend the premium for  a crank-up when a 
self-supporting tower would give you whatever height you  want with a more 
structure. Of course a guyed tower would be even  somewhat less expensive for 
>  Does anyone know how the max windloading figure increases as  the tower is 
    You're asking engineering questions. Contact UST  for specific answers. 
They're not particularly well informed about engineering  questions but you 
need to start somewhere. 

>  What would be  the recommended rotor for a beam of this mass - I want the 
installation to  hold up in our rough summer storms. I am located in North 

The Orion with the Green Heron controller  is second only to a prop pitch. 
The Orion mast clamp is a very poor design. _www.championradio.com_ 
(  sells a custom  clamp that does a much better 
job. There 
isn't any info currently on the  website - sorry - but I can send you a picture 
of it if you're interested.  They're $120.00, are hot-dipped galvanized and 
use 6 U-bolts to hold the  mast. 

Steve      K7LXC
Professional tower services for hams
Champion Radio Products
Cell: 206-890-4188


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