Scott,
With a side arm mount, you get about 300 degrees, not 90... at least on a 3
faced tower. You use a "gate" that hold the beam (in your case, dipole)
away from the rotator mast about 2 feet or so.
As far as setting stops - I've often seen red tape used to indicate "don't
turn here", even though the human factors of such an approach sucks!
-Rex-
K1HI
Rex Lint
Merrimack, NH
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Scott Honaker
Sent: Tuesday, November 24, 2009 6:15 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Rotating a dipole on a side-arm
Our county is building a new Emergency Operations Center and tower. We
have had notoriously bad luck with our roof-mounted wire HF antennas. I
have been considering using an HF multiband dipole (like a SteppIR) on the
tower. There will be a microwave video downlink at the top so I am left
with a side-arm mount. I see the Tessco catalog lists 72" side-arms.
The next question is how to I rotate it and not whack the tower. I need a
rotor or controller with adjustable stops. Does such a thing exist? I
can't trust simply marking the display with a "don't turn here sign". The
rotor needs to not go there.
We expect to use a free-standing 3-legged tower so I anticipate I can get
at least 90 degrees of rotation. That should let me cover any bearing and
hopefully let me reduce the effect of local noise.
What should I be considering?
Thanks,
Scott N7SS
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