I concur, plus the u-bolt keeps the antenna from spinning while the rotator
is removed!
John KK9A
To: towertalk@contesting.com, tod@k0to.us
Subject: Re: [TowerTalk] One thrust bearing vs. two
From: K7LXC@aol.com
Date: Wed, 12 Aug 2009 11:58:07 EDT
The alleged purpose of the middle thrust bearing is to hold the mast
vertically to aid in rotator replacement. You don't need a middle
bearing - all you have to do is capture the mast. You can do that with a
rotator plate sans bearing or fabricate a mast holder made from a couple
of pieces of angle iron and U-bolts. You just install it when you need it.
A mid thrust bearing can potentially add more bind in the rotator/mast
system. The tolerances are relatively large and some misalignment is
common.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
Cell: 206-890-4188
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