I've used dozens of elevated guy posts for towers up to 120 feet over the past
24 years. Some with 4-inch pipe filled with concrete, others more recently with
I-beams. Never had any break off.
In one case at a previous QTH I had to clear a driveway and used a 4-inch pipe
with about 6 feet in the ground. The hole was about 10-12 inches diameter
filled with concrete, this in somewhat rocky soil in northern Delaware.. The
pipe stuck out 7 feet, and inserted into it was a 2.5 inch diameter pipe about
14 feet long that stuck up 7 feet above the larger pipe -- total height about
14 feet. Both pipes were filled with concrete. A threaded rod at the tip of the
small pipe, perpendicular to the guy wire, and another through the top of the
larger pipe, provided the attachment points for the turnbuckles. The tower was
120 feet of Rohn 45, house bracketed at 28 feet and guyed at 60 and 100 feet.
The upper guy attached to the top of the larger pipe; the lower guy attached to
the top of the smaller pipe, 14 feet or so above ground. This post was rock
solid and did not budge in the 8 years I was there. There were no backstays on
any of the elevated guy posts.
This worked for me. YMMV.
Some previous discussion on elevated guy posts here:
http://www.qth.com/ka9fox/guy_posts.txt
Some pix of my current installation here:
www.aa1k.us
73/Jon AA1K
_______________________________________________
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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