In a message dated 11/27/2005 8:16:52 A.M. Pacific Standard Time,
towertalk-request@contesting.com writes:
> Hi all, I have been thinking about Putting up a HY-Gain TH-11DX. My tower
is a Rohn 20G at 50'. I have a few questions.
How much twist will the 12.5 sq.ft. windload put on the 20G tower?
A lot. Rohn limits 20G to 2 square feet of antenna @ 70 MPH - it's a
"Home TV Tower".
> Will it just twist the tower into failure.
Probably.
> Do I need to put up 45G or 55G.
Not necessarily. Rohn 25G will take that kind of load but not 20G.
> I would like to go up to 70'.
Rohn only gives specs up to 40'.
> I have a 5'x5'x4' base for the tower I have up now, Would that work for
45G?
Sure. Grind out whatever is sticking out of the concrete now and then
use a flat base on the bottom. You can drill out the concrete for anchor
bolts;
epoxy them in, then bolt the plate to them and you're good to go.
Get a Rohn catalog - available free on cd from _www.rohnnet.com_
(http://www.rohnnet.com) or you can look up the appropriate pages on the
website
catalog - and follow their specs. Then you'll avoid violating the LXC Prime
Directive to "DO what the manufacturer says".
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for commercial and amateur
Cell: 206-890-4188
_______________________________________________
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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