Through my own testing and experimentation, using two very different receivers, I found that when applying USALS I could not drive the motor to any satellite further than 59.5 degrees east or west from my longitude coordinate entry.
This may vary slightly depending upon the entry for the latitude coordinate, but if I enter my longitude coordinate as 96.4°W, then I can only use USALS to go to satellites with an orbital location less than 155.9 °W or greater than 36.9 °W.
I determined that the same limitation existed when using the Coolsat 5000 and with the AZBox Premium/ Premium Plus receivers.
This limitation was NOT altered by the motor that I used. I tested this with two variations of the SG2100 and with the DG280 and the DG380 motors.
Beyond this point in my arc, I must apply DiSEqC 1.2 motor control to position the motor and align with the sat - up to the mechanical limits of the motor.
RADAR