I thought about this last night and came up with the following solution
that I'm copying to the reflector, just in case my spatial cognition is
\ \ / /
\ \ / /
x \ \o==x / /
\ \ / /
O.K. your shaft down through the tower gets a sprocket attached at the 'O'
in the middle
(small x are tower legs)
The arm between the two 'O' is free to rotate around the rotator shaft.
At the 'O' outside the tower is a sprocket attached to the arm going to 'Z'
and this arm
is free to rotate around the outside 'O'.
The arm 'O'-'Z' is long enough so a boom mounted perpendicular to O-Z at Z
will clear x(N)
A chain connects the sprocket on the rotator shaft to the sprocket on the
You can use a spring to force one arm to turn it's full range befor the
other but that's
esthetics. Tower legs make good mechanical limits if the rotator isn't too
| From: Frank T. Brady <firstname.lastname@example.org>
| To: email@example.com
| Subject: [TowerTalk] rotating stacked yagis
| Date: Wednesday, July 30, 1997 9:07 PM
| Is there a mechanism that would permit me to rotate a yagi mounted down
| the top of the tower by somehow transferring the mast rotation to it?
| In other words, imagine a 72ft tower with a long mast running down to the
| 50ft level or thereabouts. A single prop pitch or equivalent rotator
| the mast. No problem turning a yagi mounted at the top of the mast
| the tower top), but can I also rotate one or more other yagis mounted
| from the tower top x feet by converting the rotation of the mast somehow
| it will turn the 'side mounted' yagi too?
| I give up trying to describe this - hope someone understands me <g>
| Frank T. Brady - W0ECS
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