In a message dated 6/4/02 9:32:18 PM Pacific Daylight Time, VSal@teltone.com
writes:
> The question is :
> If I use thrust bearing on the 2 inch aluminum conduit mast ( two coupled
10
> foot sections) - what should be the SAFE height of the mast above the top
of
> the tower?
> I am guessing that the mast could act as a spring and the section inside
the
> tower should be as long as feasible. I just do not want to bend the section
> above the bearing if it is made too long.
>
> My rotator is garden variety Ham rotator - no brake. I am not too concerned
> if the rotator cannot handle the start/ stop . My main concern is not to
> bend the mast above the bearing.
>
Good thinking. Snohomish County is a 75 MPH windspeed zone (they're all
listed at <A HREF="http://www.championradio.com";>www.championradio.com</A>
under Tech Notes).
What's the square footage of your proposed antenna? With this info, I can
make a more educated guess.
Is your proposed aluminum conduit suitable? Probably not. Conduit is not
rated for strength; at the minimum you would need real aluminum (i.e.
6061-T6) but even it might not be strong enough.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for commercial and amateur
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