Thanks for the pointers to the engineering data. That gives me exactly what
I need. It also reminded me of an analysis that K7NV has on his website at:
I need to read it again in detail, but the baseline model in the study is
very close to my situation. A quick glance indicats that movement of 6" or
so in a 90MPH wind might not be all that unusual. It also reminded me that
putting the tower on a pier pin will reduce the stress on the base. I'll
read the study more carefully and also do the calculations based on EHS
I originally planned to use the 25G only as a ladder, but if I can also
mount the antenna to it, it will simplify the antenna installation. I don't
think it should make much difference structurally since the tree and the
tower will move together.
> If you stick a 25G on a pier pin, you can pretty much ignore what typical
> tower movement might be. The tree is going to be holding up the tower.
> I sort of liked the suggestion to put up a ladder instead. So, what would
> a good ladder? How about 100 feet of 25G?
> If you still want an answer to your initial question, it is relatively
> to approximate when you know how much guy wire stretches and use the data
> from the Rohn catalog and the law of cosines equation.
> Law of Cosines Equation
> Guy Wire Stretch
> 6.77 inches of stretch per 100 feet of 3/16" EHS when under a 3000 pound
> Gerald Boutin, VE1DT
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