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The antenna has an Alliance Tenna Rotor on the pole, but the
control box is gone. I'd like to build a simple control. I
was told the motor needs 24volts, but is it AC or DC, and
how do I reverse it?. I know I wont have the pointer, so I
will have to go outside to see which way it is pointing, but
as long as I can move it. Does anyone have a schematic for
this, and also know what numbered wire screws do what on the
rotor?

Alliance made several models of rotors differing in their
mechanism for indicating direction. However, the motor
requirements are virtually identical. You will find two motor
windings with a common connection. The motor is powered with
24 volts 60 Hz but in TWO PHASES. The second phase is supplied
by placing a non-polar electrolytic capacitor in series with
the transformer output. Using a center-off single-pole double-
throw switch, you can control the rotor direction.

Connect the common connection of the two motor windings to one
transformer lead. Connect each of the two winding leads to the
switch connections. Connect the switch common to the other
transformer lead. Then connect a 100 uF to 200 uF 50-volt non-
polar electrolytic capacitor between the switch connections.
[If you cannot find a non-polar electrolytic of the correct
value, two conventional electrolytic capacitors with their
cathodes (negative leads) connected together will work, using
the two anode (positive) leads as the non-polar capacitor.]

In the "off" position, obviously the rotor will not turn. In
either of the "on" positions, the transformer voltage will be
directly connected to one motor winding and the other motor
winding will be connected in series with the capacitor to the
transformer voltage. One position will provide clockwise
rotation and the other will provide counter-clockwise rotation.

This will turn the antenna. It's crude, but it works. You
will need to know which model of rotor you have to develop an
indicator circuit if you wish to go further.

73, Barry WA4VZQ