At 04:17 PM 8/23/01 -0500, Richard Thorne wrote:
>
>I'm getting some conflicting info on the Yeasu G1000SDX rotor. On the
>Texas Towers web site they list the K-Factor as 1660 ft-lbs in one place
>and 2020 ft-lbs in another. A check of the Yeasu site says the K-Factor
>is 1660 ft-lbs.
>
>If I use 1660 ft-lbs, it would not be enough to rotate a C31XR which has
>a K-Factor of 1951 ft-lbs.
>
>On the other hand the 1000sdx has been turning my C4XL quite nicely for
>a couple of years which has a 30' boom.
>
>If I upgrade to a C31 am I looking at a new rotor too?
I don't think so, if only because the K factor is such an inexact guide. A
number that is derived by mathematically placing the entire weight of an
antenna at the ends of the boom relates only loosely to the actual forces
it will exert on the rotator when starting and stopping. The 82 lbs of the
C-31XR are distributed relatively evenly along the entire boomlength, so it
would logically be easier on the rotator than, for example, a full-size
2-element 40m yagi of the same weight and turning radius.
Also in your favor, the maximum wind torque of the C-31XR is rated at <200
inch pounds. By comparison, the C-4XL has a K factor of 1547, but its
maximum wind torque is rated <900 inch pounds.
Considering the imprecision of the yard-stick used, I'd say that's pretty
much a wash. Given the other advantages of the Yeasu rotators, and the big
step up in cost of the G-2800, I think I'd stay with the G-1000.
73, Pete N4ZR
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