In a message dated 98-09-25 21:29:41 EDT, kb0lxx@gfherald.infi.net writes:
> I have a hy-gain tower, modle HG-52SS. Tower is rated at 50 mph at 52
> ft, with windload of 10 ft. I'm useing a 13 ft. mast with 4 antennas.
> Wind load will be 10 sg. ft. The tower is a three section crank up. I
> only want to crank the tower up to a height that would allow it to be
> rated at app. 75 mph., need help to determine what height I should
> crank the tower up to for a app. rateing of 75 mph. Also does anyone
> have a est. windload for each ft. below 52 ft.
>
You will be particularly interested in an article by Roger Cox, WB0DGF,
of Hy-Gain called "Match Your Antenna To Your Tower". It covers wind load,
bending moment as well as having charts of windspeed vs. extended height of
Hy-Gain crank-up towers. The reprint is a buck from Tower Tech, Box 572,
Woodinville, WA, 98072.
Bruce Horn, WA7BNM, has written a short analysis on the same topic with a
US Tower 89-footer. It's a buck also.
Cheers, Steve K7LXC
Champion Radio Products
www.championradio.com
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