That depends entirely on the set-up. Mine was a TB2 thrust bearing in
the top of an HDBX-48. Rest assured that this particular setup is quite
sensitive to the mast being centered in the rotor. Had I *not* used a
thrust bearing, but instead merely a sleeve, I'd have never known. I'll
still lay money on lack of a proper shim.
Kim N5OP
On 2/19/2017 7:22 PM, Ken K6MR wrote:
Most crankups have a sufficiently large sleeve in the top that the shim is not really necessary. We are talking
1/32” here. Even the sleeve in the Rohn pointy top sections is spec’d at 2.08 I.D. (1/32” =
0.0313”). That’s way more than necessary to allow for the eccentricity that would be present when using a
2” nominal mast.
My guess at the original poster’s problem is unbalanced torque present under
windy conditions. Bencher seems to be the only tribander that includes a torque
compensator in their design.
Ken K6MR
From: john@kk9a.com<mailto:john@kk9a.com>
Sent: Sunday, February 19, 2017 4:39 PM
To: towertalk@contesting.com<mailto:towertalk@contesting.com>
Subject: Re: [TowerTalk] tower/rotator woes...
Many years ago when I had a small tribander at my parent's home, I had a Ham
IV and I shimmed the clamp because I used a water pipe mast which was 1.90
OD. I have not used that style rotator since then and I was surprised to
look at the manual today and see that the T2X was designed for a 2 1/16
mast. Who uses this size? This seems like a poor design and at a minimum
they should include a shim pack. How many people are properly using shims
with Hy-Gain rotators?
John KK9A
Re: [TowerTalk] tower/rotator woes...
from [Kim Elmore] [Permanent Link][Original]
To: DAVE WRIGHT <kanives@yahoo.com>, towertalk@contesting.com
Subject: Re: [TowerTalk] tower/rotator woes...
From: Kim Elmore <cw_de_n5op@sbcglobal.net>
I had a similar problem because and must, with some embarrassment, admit
that I was careless and did not shim the rotor as I should have. The T2X is
made to accommodate a 2 1/16" OD mast. My mast is a galvanized steel 2" OD
and for yeas, I couldn't figure out why my T2Xs kept failing. I listened to
it and heard it bind, then carefully read the manual *again* and saw that --
Lo! and Behold! -- the T2X is designed for a 2 1/16" OD mast. I purchased
some 1/32" aluminum sheet metal and placed in in the cradle of the T2X
and... No more binding! The rotor now turns freely. The T2X is a very tough
rotor; chances are, this will fix your problem.
Kim N5OP
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--
Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
/"In theory there is no difference between theory and practice. But, in
practice, there is." //– Attributed to many people; it’s so true that it
doesn’t matter who said it./
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