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@contesting.com] On Behalf Of Danny
Pease
Sent: Wednesday, June 01, 2016 3:23 PM
To: TowerTalk@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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