[TowerTalk] tower specs/not wind loads

[Don Havlicek]

N0OEL at aol.com wrote:
> 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.   


5.5 square feet?  Do you mean CUBIC feet?  If so, that is definitely NOT 
enough concrete.  5.5 Cubic YARDS makes more sense to me, as my 
Universal towers ALL have from 4 to 6 Cubic YARDS of concrete below them.

Don
N8DE
> 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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