[TowerTalk] [Bulk] Correction KV4AA 20 meter beam was a Telrex

[Grant Saviers]

Check out the rotator for a Luso 150' tower (20 ton tower + 1 ton of 
antennas), pretty substantial since the tower counterweight moves with 
the tower, 1 rpm I think.

As for "linear" actuators, my Deere backhoe had two pull hydraulic 
cylinders connected to a substantial chain that swung the backhoe. Use a 
full sprocket, some serious chain, and  long enough travel cylinders and 
you have a super duty "rotator".

Grant KZ1W

On 6/1/2016 16:03 PM, Herbert Schoenbohm wrote:
>
>
> Now thats a CLASSIC Herb!
>
> Love these old radio stories!!
>
> Best regards,
> Scott W3TX
>
> On Jun 1, 2016, at 5:07 PM, Herbert Schoenbohm 
> <herbert.schoenbohm at gmail.com> wrote:
>
> I remember visiting the radio shack of DX legend Dick Spencely's 
> (KV4AA) in the 70's and saw how he rotated his*Telrex*  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
>
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