[TowerTalk] WHICH ROTOR TO USE?

[K8RI]

On 5/5/2012 3:36 PM, Jon Pearl - W4ABC wrote:
> I was just going to make that suggestion, Bob...
>
> http://www.cytorq.com/
1500 in# of torque and 4500 in# of holding torque limit 25 sq ft of 
antenna. It also has a 30' boom limit. My 7L 6-meter yagi would take 
care of that.
It's not clear in the photos but I hope that is the top seal and not a 
bearing where they show the rotator mounted to their 25G mounting plate.

  The PST-61D has 2,150 in# of torque and 16,530 in# of holding torque. 
IE, it doesn't need a brake and is rated for 39 sq ft of antenna.  
Weight 55#
IE about 43% more torque  2150-1500 = 650/1500=0.43 and almost 4X the 
holding torque and 56% more antenna.

The heavy duty version PST61DHP has 7,640 in# of torque, the same 16, 
530 in# of holding torque and is rated for 42 sq ft of antenna(s)Weight 66#
5X the rotating torque and 4X holding torque.

The early PST61s had a top seal problem that is supposed to have been fixed.
   Be wary of the older ones using the green, AC motor.  You can build a 
shield to keep water off the top seal fairly easy, but they are likely 
to fail if not modified.
I believe they also are using white Lithium grease now instead of the 
heavy weight gear lube there were using.
One more point, I don't think you will get one inside a 25G.

73

Roger (K8RI)
>
>
> 73,
>
>
> Jon Pearl - W4ABC
> www.w4abc.com
>
>
> On 5/5/2012 2:15 PM, Bob Gibson wrote:
>> There is a new rotor on the market now that looks pretty good..check out..oytorq.com..I use a orion 2800 and a green heron to turn a 4 ele 40 and a 4 ele steppir..no problem here in fl. 73s Bob
>>
>>
>> Bob Gibson W5RG
>>
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