Also remember to tighten the mast clamp first, the rotator to plate bolts
next & the plate to tower clamps last. Less chance of getting things
knocked back out of alignment.
At 01:19 PM 12/3/02, kk9a@arrl.net wrote:
>It sounds like you have to shim your rotor. You should measure your mast
>diameter and install the appropriate shim. I'm not sure why Hy-Gain rotors
>are designed for a 2.062" mast. I would not change the top section just
>because it's binding. It sounds like you have enough clearance and without
>knowing your antenna load I see no reason for anyone to recommend a bearing.
>You should also check the rotor plate to be sure that's it's level and that
>the holes are centered. The lower you mount the plate the less line up
>problems you will have.
>
>John
>
>----- Original Message -----
>From: "Dale L Martin" <kg5u@hal-pc.org>
>To: "TowerTalk Reflector" <towertalk@contesting.com>
>Sent: Tuesday, December 03, 2002 17:35
>Subject: [Towertalk] New Rotator In Place; Mast Now Binds
>
>
>
>Yesterday afternoon, I replaced my old HAM-M with a HAM-IV recently returned
>from getting serviced.
>
>The M was showing some signs of age and it has been some years since it was
>last overhauled.
>
>On checking out the rotation of the new rotator on the tower, it swung from
>North through East to South. When swinging back the other way, rotation
>stopped at East. I was finally able 'ooch' the rotator through to about NNE
>where it resumed normal rotation speed. (The rotator worked perfectly on
>the test bench, by the way.)
>
>I moved the rotator back to South through East then back up to East where it
>stopped. I went up the tower (Rohn 25G, pointy top) to check things out.
>It looked like the mast was against one side of the bottom of the pointy top
>mast guide. When I had installed the rotator, I left the rotator base
>mounting bolts loose. I then tightened them up AFTER tightening the mast
>clamp--from something I read on the TT reflector.
>
>With the rotator on East, the rotator portion of the mast clamp is on the
>West side of the rotator where the mast seems to be tight against the pointy
>top guide. Is shimming the mast in the clamp a workable solution for this?
>
>If I shim it such that the mast now clears the bottom of the guide by a
>little bit where it's now binding, will I just move the binding point or
>will there likely be enough clearance between the mast and the guide to
>rotate freely? I didn't measure it, but it looks like there's about a
>3/16-1/4" of clearance on the other side of the mast from where it contacts
>the guide.
>
>Comments/Suggestions?
>
>Of course, today's weather forecast is thunderstorms, high winds, cooling
>temps.
>
>73,
>dale, kg5u
>
>
>
>_______________________________________________
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>
>_______________________________________________
>AN Wireless Self Supporting Towers at discounted prices,
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>
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>888-333-9041 for additional information.
>_______________________________________________
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Jim Rhodes K0XU
jim@rhodesend.net
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