I live in an 80-mph wind zone and am going to put up a 70 foot Rohn 45G tower, using 3/16 EHS for the lower guys and HPTG6700 for the top guys. I will have a 22-foot DOM 1026 mast with a 6.8 sq. ft.
You're overloaded, even for 70mph winds. There will be considerable torque exerted on the tower so consider a star bracket at the top guy point and a pier pin base if you want to go ahead and exceed
Tom: Unless I am mistaken an "80 mph wind zone" will have 3 sec gusts of about 100 mph as a part of the 80 mph wind. To be totally comfortable with your installation I would think you would want to d
TT: Didn't someone here post a few years back that there was an error in Frank's spreadsheet calcs? Anyone know what they are? 73 de Gene Smar AD3F _______________________________________________ ___
Gene: There was a Letter to the QEX Editor from DJ0IA [Jan-Feb 2003, p.60] commenting on the fact that the calculations did not take into account the effect of icing -- which is correct. The calculat
Tom, I stand corrected. It's high time I admit to the need for bifocals rather than removing my glasses to read (which doesn't work very well either). I am however fond of star bracketing a tower w
The pier-point base has the advantage that you do not need to be concerned about water draining from the legs embedded in concrete. I have a 110' Rohn with a pier-point base that has been up twenty y
Tom, I'd go with the pier pin or a rooftop base on a flat cement slab. Use long bolts in the cement to bolt the rooftop base to. I see no value in sinking tower sections in cement. Jim, KR9U ________
For years the concrete base was standard on smaller towers which tend to be more flexible. ROHN still recommends that approach for bracketed towers, but the pier pin base for taller, guyed towers. Us