I may be completely off base with this, and if I am, I'll apologize right
now. With the Rohn BX, and HDBX series of towers, the "square foot" changes
according to model. But I swear, I thought I read that they all had a rating
on them that said not to use an antenna with a boom over 10ft. Is that
right, or did I just read the specs wrong?
73, Mike K9MI
----- Original Message -----
From: <N0OEL@aol.com>
To: <Steve@bnjcomp.com>; <towertalk@contesting.com>
Sent: Tuesday, January 24, 2006 04:39
Subject: Re: [TowerTalk] tower specs/not wind loads
> Many of the towers made today are designed to sway and you dont want to
> guy
> them such as the popular line of Universal Aluminum towers. The steel
> towers are built to be self supporting to a certain height as described
> by their
> engineering specs. The same with the Aluminum towers and you should
> pay
> big attention to their specs. The 40 foot Rohn 25G
> wont hold a lot when self supporting. In fact outside of a small beam
> forget it without a set of guys!
>
> Rohn will tell you the size tower they advise and if its 25 G pay attn to
> the need for guys. If its HDBX dont try to guy it as its designed to
> sway
> Towers all vary as to max height and that height should depend greatly
> not
> on what you want but as to the antennas to be put on them and that
> antenna's
> windload. Antennas should be a certain height above ground depending
> on
> what bands you intend to work. I personally think that the good DX
> starts at
> 50 feet with the average triband beam. Dont try to impress the
> neighborhood with big towers but build what is necessary and safe. BTW
> the 56 foot
> HDBX Rohn is small in
> windload capacity and safer if you build it to just 48 feet!
>
> Pay big attention to windload and the specs of the beam and the tower
> before
> you determine height of your tower. My triband Higain is at 50 feet
> selfsupported aluminum with a 26 inch base. I have 5.5 sq feet of
> concrete
> holding it up. And it works great. And yes, it does have some sway as
> much as 6
> inches as it is is designed.
>
> Good luck!
>
> 73
> Mike
> K0BUD
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