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## [TowerTalk] rotating stacked yagis

 To: [TowerTalk] rotating stacked yagis wb4mnf@atl.org (Bob Duckworth) Thu, 31 Jul 1997 11:40:56 +0100
 ```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 | To: towertalk@contesting.com | Subject: [TowerTalk] rotating stacked yagis To: | 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 | | Regards, | Frank T. Brady - W0ECS | | | -- | FAQ on WWW: http://www.contesting.com/towertalkfaq.html | Submissions: towertalk@contesting.com | Administrative requests: towertalk-REQUEST@contesting.com | Problems: owner-towertalk@contesting.com | Search: http://www.contesting.com/km9p/search -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search ```
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