[TowerTalk] More tower guy questions

[Nat Davis]

Thanks to all those that replied to my questions last week on whether or 
not to guy my tower when I add a section of Rohn 25G to raise it from a 30' 
bracketed tower (bracket at 15') to 40'.  The general feeling was that the 
40' tower would probably be strong enough without guys but most advised 
going ahead and guying it so as not to have to worry.

The Rohn catalog calls for the guys for a 40' tower to be attached at 35' 
and the anchors to be 32' out from the base.  Guy tension would be 400 
pounds (10% of 3/16" EHS breaking strength).

Due to other things being "in the way" of one guy anchor,  I may need to 
bring the guy anchor locations in or out a few feet vs. Rohn's 32' (would 
use the same distance from the tower for all 3).  How should I adjust the 
guy tension if I do this?  At 32' and 400 pounds tension, my math says 
there is about 295 pounds of downward force on the tower legs for each guy 
wire (and 270 pounds horizontal).  Should this downward force be kept the 
same (by increasing or decreasing the guy tension) if the location of the 
anchor is moved in or out?    Is there some other tensioning rule?  IS 
there a point where the anchor is a little "too close" to the base to be 
effective?

Thanks again,

Nat Davis
N4EL


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