In a message dated 2/27/2006 9:02:09 A.M. Pacific Standard Time,
towertalk-request@contesting.com writes:
> I have purchased several sections of Rohn 25G - 3 straight sections, and
the 8' top section with rotor plate. I want to attach this to the side of my
two-story house, at two locations (top header board, and the bottom board on
the second story). This is about 10' and 20' up from grade.
> What additional things do I need to purchase besides the 10' piece that
goes in the concrete; the house brackets; and a thrust bearing for the mast -
what else is required?
Umm, any section can go in the ground. The short-base is just
half-a-section anyway. Just make sure there's 4-6" of sand for drainage in the
bottom.
Two housebrackets is per the manufacturer's specs so you'll need them.
Be sure to have a backing plate on the inside of the housebracket to spread
the forces out.
The only kicker might be that you're proposing being 18 + feet
including the concrete base section above the top housebracket. Rohn specs
only want
you to go about 14 or so. I don't think it's a fatal problem, just be sure to
err on the conservative side in your installation.
> Antennas planned are Hy-Gain TH3-MkIII, CC 505S, CC 215 and a M2 432-9wl
antenna....
You really don't need a thrust bearing since your rotator will be able
to take any vertical load that you can put on 25G - especially the ones below
that you're proposing.
Tony's, K1KP, article is a real engineered house bracket installation
including reinforcing the rafters so you can see how involved it can be.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for amateurs
Cell: 206-890-4188
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