FOR SALE:  RD-1800 Heavy Duty Rotor with DPU-1800D Digital Control, manufactured by C. A. T. S. (the Rotor Doctor) in Pemberville, Ohio. 





Specifications:

Wind Load Rating:  greater than 25 sq. ft.

Rotating Torque:  150 ft/lbs

Braking Torque:  1000 ft/lbs

Vertical Load:  900 lbs

Speed:  1 RPM nominal @ 20 VDC

Rotor Body Diameter:  8.5”

Rotor Body Height:  6.5”

Mast Clamp Height:  6.0”

DB9 connection on controller permits directional control via computer. 

This rotator was in service for approximately one year, and replaced due to my error—not due to rotator problems.  Somehow—still a mystery—the four bolts securing the rotator to the rotor shelf dropped out.  When the antenna array began swinging in the wind, I thought the rotator had failed, and a replacement rotator was purchased.  Then the problem was discovered.  The excessive, unplanned movement of the rotator caused minor damage to the pigtail and connector.  The connection has been tested and the rotator and controller are performing perfectly. 

In June 2007, this rotator and controller cost $1228.50, new and delivered.  I’m asking $800 for it. 

Jack Sproat – W4JS