Our whisper test Doebis did not promise too much the SG99 is a truly silent motor. We used it very heavily for over one week for our normal feed hunting. After that, we installed a 120cm dish larger than recommended by the manufacturer. But even with this biggie, it didn t produce any squeaking, grinding, moaning or other unwanted noise. The motor moves by one degree every 5.48 pulses, making it accurate enough for smaller dishes.
Many motors have accuracy problems at the very ends of the orbital arc in either direction.
The SG99 has not it was accurate over the entire range of satellites we can receive here. But even a motorised dish will not enable the reception of every visible satellite anytime. Some are in inclined orbit, which means that also the dish s elevation has to be re-adjusted continually. No problem as the special SG99EL version of this unit comes with an additional elevation actuator. It is controlled either by a separate controller, which is available from specialised dealers.