Hi captainkirksdog,
I would suggest you line up the moveable axis north-south,
then use parts from an electric clock.
The motor in an electric clock has very little torque,
but after its been geared down to operate the hour hand
it has adequate torque for most things.
I guess you would only want your dish to follow the chosen
area of sky for an arc of movement, their wouldn't be much
point in aiming at something below the horizon.
You're looking at a difference of movement of 144 to 150
aproximately.
If you are capable of modifying the gears, i think that
would be the best way, then you can just use the mains
supply.
If you want to do this electronically, you're looking at
making an oscillator to give you 2 cycles different from
the 60 cycles per second supply that is common on the
western side of the Atlantic or about 1.8 cycles different
from the 50 cycles per second supply that is common here
in England on the eastern side of the Atlantic.
Fortunately the power required to run an electric clock
motor is very small, but you will need to use a transformer
to step the voltage up from a low voltage oscillator.
I would guess that a simple LC type oscillator would be
stable enough if run from a stabilised supply. I guess that
it would only be used over a few hours, so cumulative
error would not be a problem.
I would use the step-up transformer as the L part of an
LC oscillator, such circuits are simple and dont have many
components.
Simple emitter follower stabiliser circuits are easy to
build too, and dont have many parts either.
If you take this approach, then set the frequency with the
clock motor connected, as it may alter the tuning slightly.
I would be interested to know the aproximate angle of the
arc you intend to cover.
If its only small, there may be easier ways of doing this.
Regards, John