At 10:17 AM 12/1/2005, K7LXC@aol.com wrote:
>
>In a message dated 11/29/2005 6:48:20 P.M. Pacific Standard Time,
>towertalk-request@contesting.com writes:
>
> > Just got a general license.
>
> Congratulations! Hope you have as much fun as I have.
>
> > Appreciate all the help that has been shown me. I want to put up a 3
>element SteppIR on top of a Glen Martin 9 foot or 17 foot roof-top
>tower. The
>tower will be going onto a one story home (60 years old) in Los
>Angeles---E.I.A. 70 M.P.H. I am getting a Yaesu G 1000 SDX rotator. I
>have been told it's
>a good (very good) idea to guy the tower. I also have an Icom 756 Pro2.
>Thanks everyone for any and all help....73.....Cary KI6BMM
>
>
>
> I've installed a bunch of the GME 9-footers and they're great. The one
>thing I do is to use all-thread thru backing 2x4's in the attic. GME
>wants you
>to use lag screws screwed into a roof joist - it's not very practical and
>depends on the lag screw for holding power. By using backing plates in the
>attic and all-thread you spread the forces over a much larger area of
>your roof
>than the lag screws.
>
> (For anyone quibbling about my violation of the LXC Prime Directive to
>"DO what the manufacturer says", this comes under the heading of
>"Improvements
>and Over-Engineering".)
>
> I'd suggest that the much larger overturning moment from the 17-footer
>wouldn't be worth the small increase of wavelength-above-ground height of
>the
>antenna.
Unless your trees or neighbor's house happen to be 30 ft high, and getting
the antenna up a bit above them will help. Depends a lot on the local
environment, and what your roof looks like (is it flat or pitched?)
Jim...
_______________________________________________
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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