[TowerTalk] rotating stacked yagis

[Bob Duckworth]

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
wacked out.




					x(N)





					O\ \
					      \ \		                     Z
					         \ \                    	      / /
						\ \	               / /	
						   \ \		/ /
			x			      \ \o==x   / /
						         \ \      / /	
							O/ /
								
					

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
outer arm.
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
stout :-)


-bob
wb4mnf





----------
| From: Frank T. Brady <ftbrady@cosmoslink.net>
| To: towertalk@contesting.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
from
| 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
turns
| the mast.  No problem turning a yagi mounted at the top of the mast
(above
| the tower top), but can I also rotate one or more other yagis mounted
down
| from the tower top x feet by converting the rotation of the mast somehow
so
| it will turn the 'side mounted' yagi too?
| 
| I give up trying to describe this - hope someone understands me <g>
| 
| Regards,
|  Frank T. Brady - W0ECS
| 
| 
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