[TowerTalk] homebrew rotator

[Herbert Schoenbohm]

I remember visiting the radio shack of DX legend Dick Spencely's (KV4AA) 
in the 70's and saw how he rotated his Mosley 20 meter Yagi with a 
bicycle elongated chain drive that came into the shack and was driven by 
a reversible motor.  He had a positional marker on the chain that gave 
him his direction indicator.  It was 100% home brew but never failed.  
The beam was on  a windmill tower with the mast coming all the way to 
the ground with coupled water pipes and a bearing at ground level where 
the main chain driven sprocket was located.


On 6/1/2016 3:59 PM, Bert Almemo wrote:
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>
> Hi Danny,
>
> Rack and pinion is mostly for linear motion. I believe a worm gear with
> direct drive or a chain drive would be a better choice. Using a worm gear
> you have the breaking function built in. Good luck!
>
>   Bert, VE3NR
>
>   
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Danny
> Pease
> Sent: Wednesday, June 01, 2016 3:23 PM
> To: TowerTalk at contesting.com
> Subject: [TowerTalk] homebrew rotator
>
> I have been intrigued with putting together my own antenna mast rotation
> system and wondered if anyone has any info on using a rack and pinion gear
> type system in conjunction with a linear actuator. If the rack and pinion
> turns out to be too expensive, my second choice would be a chain drive with
> the linear actuator.
>
> Thoughts?
>
> Danny NG9R
>
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