I have a F12 C-3E on an AB-577. The tribander mounts on a very short
stub mast out the top of the Yaesu rotator. There is no thrust bearing
or other support for the mast.
I recently bought a Cushcraft 3-element 6-meter beam and want to stack
it about 5 feet above the tribander. The antenna weighs about 7 pounds
and has very low wind loading. A friend gave me a very heavy 8-foot
steel mast, which I thought would work, but after handling it for a
while (it's really heavy), I think it would be overkill, and very
awkward to install, even with two or three guys on ladders. Cutting it
down would help marginally.
So I'm debating a lighter, thinner-walled steel or high-strength
aluminum mast instead. Sitting just above the rotator's top clamp, the
tribander would impose very little bending load on the mast in the wind,
and the 6-meter yagi ought to be trivial in that regard too, at only 5-5
1/2 feet above the rotator. I'd appreciate advice - am I better off
just suffering through the installation of the heavier mast, or if what
I'm proposing would work, what material do you suggest?
--
73, Pete N4ZR
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web server at<https://reversebeacon.net>.
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