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The VK5DJ Beam Rotation Controller may be used to track the moon or sun using internal software. It is a self contained unit but requires external encoders and motors.
For satellite use, the tracking information from Orbitron may be fed to the unit and the antennas controlled as above. This video shows how the YAESU G5500 may be controlled avoiding the requirement to buy the expensive data interface.
Further information from my website http://www.vk5dj.com