- A synchro receiver whose output is a mechanical angle obtained by subtracting one electrical angle from another. Such a device utilizes a damper to limit oscillation or spinning. Also called differential receiver, or synchro differential receiver.
- A synchro transmitter whose output is an electrical angle obtained by the sum of an electrical angle and a mechanical angle. Also called differential transmitter, or synchro differential transmitter.
- synonymdifferential receiver
- synonymdifferential transmitter