I am using a Phillips rotor and control. There is no feedback in the motor unit. When the controller energizes the motor, it is relying on a constant motion of the motor (1 rpm). The controller has a 2 digit led display to show the position by 10 degree increments, but this is time based only. In the cold and wind and the added weight of the antenna, the position gets off by 20 degrees on a regular basis. It does have the means to re-initialize the rotor and controller by driving the motor CCW for one minute, which in theory drives the motor against a mechanical stop.

I just love a good head scratch-er!

Bob