Pete - take a look at this approach:
http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/RotatorCage.htm
I've never tried it; not sure how well it worked.
--Ed, N3CW--
On 7/18/2023 12:00 PM, towertalk-request@contesting.com wrote:
Message: 1
Date: Tue, 18 Jul 2023 09:41:47 -0400
From: Pete Smith N4ZR <pete.n4zr@gmail.com>
To: TowerTalk <TowerTalk@contesting.com>
Subject: [TowerTalk] Thrust bearing for AB-577??
Message-ID: <fa20f70c-17f1-5c68-7c53-878ed7f8b0fc@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
I have a C-3E tribander on an AB-577 "rocket launcher."? I also have a
3-element 6-meter yagi that I was planning to mount 6 feet above the
Yaesu rotator at the top of the 577, but was deterred by concern of some
knowledgeable hams that this might overload the rotator and cause a
catastrophic failure, destroying the rotator and the tribander.? That's
just too big a risk for me.
It occurs to me to wonder whether someone out there has contrived a way
to mount a thrust bearing above the rotator on an AB-577?? I can
visualize what this might look like, involving a structure attached to
the top of the top-most tube below the rotator and supporting a thrust
bearing a foot or so above, but don't want to reinvent the wheel unless
necessary.
--
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