"L G" wrote in message
...
Think it was 20V AC applied one way or the other.

"Crazy George" wrote in message
...
Kevin:

Those 3 wire controllers depend on running a motor in the indicator at
the
same speed as the rotator, so indicator accuracy is sometimes less
than...............

Are you sure about that? The Alliance and CDE rotators had an interrupter
switch in the remote unit that caused a solenoid in the control unit to
advance the indicator pointer. This pulsing took place every 10 or 15
degrees of antenna rotation. The pointer turned in whatever direction the
control knob had been turned.

Tam/WB2TT