[TowerTalk] rs-232 rotator for a C36XR

[K7LXC@aol.com]

In a message dated 04/13/2000 7:18:43 PM Pacific Daylight Time, 
brunet@us.ibm.com writes:

> Thanks to all.  I learned a lot.  Since RS232 is a future requirement and
>  since the C36XR 70 mph mast torque is < 120 in-lbs I can turn it with a
>  Yaesu G800SDX at $399 or a G1000DXA at $479 and add a $179 SARtek RS232
>  interface later.  Both the Yaesu rotators have 600 in-lbs rotating torque.

     Huh? The Yaesu K-Factor (turning radius times weight) is a much more 
accurate way to gauge potential rotator capacity. That's where the K-Factor 
(also known as Effective Moment from Hy-Gain) comes in. The K-Factor of the 
C36XR is 2570 ft/lbs (23.8' TR times 108 pounds). The K-Factor of the G-800 
is 1299 ftlbs - oops! The K-Factor of the G-1000 is 2020 - ouch! You need the 
G-2800 which will do 6870 ft/lbs.  Or a TailTwister. 

      Besides, starting torque is where the 'rubber meets the road'. Once the 
antenna is turning, it don't take much at all to keep it turning. 

Cheers,    Steve   K7LXC
Tower Tech 

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