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[TowerTalk] Ham IV shimming

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: [TowerTalk] Ham IV shimming
From: Frank Davis <invl160@gmail.com>
Date: Sun, 12 May 2013 09:37:29 -0230
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
> 
> I have been investigating what appears to be  binding of my antenna system 
> during portions of the rotation.  The mast I am using is 48mm and the Ham IV 
> rotator shims are 2mm thick.  There are  two shims that  are between the mast 
> and the back of the rotator socket.  The clamping plate  doesn't have any 
> shims - The two shims are on each side of the back face of the rotator 
> socket.   There is a thrust bearing as well but I took the bolts out last 
> fall to see if that would solve my problem then but it didn't.
> 
> So the centering is off by 2mm.??....My inclination is to put 4mm shims in 
> place of the 2mm shims at the back of the rotator socket but maybe thats not 
> right.   ...is it neccessary to have the same thickness shims (2mm) under the 
> clamping plate as well?...can't see how that helps with centering? .  The 
> tower is a Hy Gain HG52SS.
> 
> 73 Frank VO1HP
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