[TowerTalk] Antenna 6 feet above the top of an AB-577

[Chuck Dietz]

There are side-mounts for towers that might be adapted to fit your mast
they have a shelf for the rotator and another shelf with a bearing for a
mast above the rotator. This would remove the strain from the rotator, but
might be too much for your mast.

Chuck W5PR

On Sun, Jun 4, 2023 at 8:40 PM Pete Smith N4ZR <pete.n4zr at gmail.com> wrote:

> I am planning to put a 3-element 6-meter yagi 6 feet above a C-3E
> tribander, which in turn is supported by a Yaesu G-1000DXA rotator on
> the top of an AB-577 tower.  An engineer ham friend has raised the
> question about whether one can do this successfully, given the side
> loads that could be applied to the rotator's case by wind, a 6-foot
> lever arm and this small yagi (1.8 square feet of wind area in a pretty
> sheltered location).
>
> Yaesu, characteristically, shies away in horror from any such thing -
> the manual recommends only using the rotator *inside* a tower, with a
> thrust bearing above it to carry mast loading.  On the other hand, my
> C-3E has survived 5 years mounted on top of the AB-577.  Their manual
> writers are extraordinarily conservative, so I'm asking for real-world
> experience. Have you mounted a small yagi like this above a G-1000DXA,
> and if so, what and how far above?
>
> --
> 73, Pete N4ZR
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