[TowerTalk] tower/rotator woes...

[Kim Elmore]

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 at kk9a.com<mailto:john at kk9a.com>
> Sent: Sunday, February 19, 2017 4:39 PM
> To: towertalk at contesting.com<mailto:towertalk at 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 at yahoo.com>, towertalk at contesting.com
> Subject:        Re: [TowerTalk] tower/rotator woes...
> From:   Kim Elmore <cw_de_n5op at 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./