My SkyNeedle has a mount for the HDR 300 and a chain drive for the the mast.
Bill W2CQ
> On Jun 1, 2016, at 8:47 PM, Grant Saviers <grants2@pacbell.net> wrote:
>
> 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@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@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
>>
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