[TowerTalk] Mast for rotator at bottom of tower?

[marc wullaert]

your rotator is not designed to be on the ground turning 90+ feet of steel.
it could be on the ground for maintaince thats all .

If you wanna do this ,look for a worm type rotor lyke the prosistel or
proppitch.
You need thick and strong steel tubes with flanges to rotate. and you need a
trust bearing
for the heavy load.

I'm now busy to build up a tower for DOoc ON4IZ  with big OPtibeam antennes
,driven by a worm rotator
from ground.If ready I will post some pictures from the total system on my
webpage.

Marc on4ma

----- Original Message -----
From: "Bill Turner" <dezrat at copper.net>
To: <towertalk at contesting.com>
Sent: Monday, June 12, 2006 3:54 PM
Subject: [TowerTalk] Mast for rotator at bottom of tower?


> I'm thinking of moving my rotator to the bottom of my 80-foot Trylon
> freestanding tower. I have read the archives about doing so, but am
> still not clear on what is a suitable mast. I could use some advice.
>
> I have a Cubex four element quad and a Yaesu G-1000DXA rotator. The
> rotator is rated for a vertical load of 400 kg, and will be mounted
> on the ground, not on the mast. At present I do not have any thrust
> bearings installed and it would seem none would be needed unless I
> use a really heavy mast material.
>
> Questions:
>
> 1. What would be a good mast material? Aluminum tubing? Water pipe?
> Chrome moly? Other?
>
> 2. Best way to join mast sections? Muffler clamps used with a single
> steel plate? Boom-type two-part clamps? Other? Pin them?
>
> 3. Whatever mast material I use, there will probably be enough
> side-to-side flexing that one or two supports will be needed part way
> up the mast to keep it from whipping back and forth. Suggestions?
>
> 4. The Trylon tower is pretty wide at the base so I think I can
> insert sections up from below thereby avoiding having to lower them
> down from the top. I hope.
>
> It would sure be nice to do rotator work at ground level.  Any other
> pitfalls I should be aware of?
>
> 73, Bill W6WRT
>
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