If i remember rightly, it send signals to the optional positioner that then put the dish to the right satellite.
In those days recievers and positioners were 2 separate boxes, i still have a Drake positioner that works stand alone, or can work in the same way with a drake analog reciever.
You can't turn a dish with it, it just sends small signals to the positioner and the positioner had to do the work.
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