I'm a little bit skeptical of this issue...
a typical tower 120' tower using 80% radius for guying at 3 points is going
to have a guting radius of 240% for the bottom set of guys... at which point
tension is getting close to the max at the bottom set of guys. One would
expect that the tower would easily handle this tension............de VE2DC
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......but, if you check your Rohn book, you will notice the lower guys are
usually one step down in size. If the upper ones are 1/4, the lower ones are
3/16. Therefore, less tension when tightening the guys on the bottom....less
pull.
Also on taller towers, when two different anchor points are necessary, the
lower bank goes back to approximately 80 per cent of the height of the highest
member of the lower bank, AND they are also one size smaller...less pull.
I'm no engineer, but it does make sense.
Bill K4XS
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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