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Auto Tracking: How's it done?

I need a brief course on automated antenna tracking methods currently in
use at OSCAR groundstations.  I'm developing some new satellite tracking
software, and although I do not have any facilities for auto tracking
my antennas at the present time, I'd like to implement the code needed
to interface a PC to a control interface to track satellites so that
others may use my program and make use of the feature if they are so

My understanding is that azimuth and elevation data is sent by the PC's
parallel port to a controller that steers the AZ/El rotator.  How are
azimuth and elevation headings fed to the controller electronics?
How many bits are used for data?  Are azimuth and elevation data sent
simultaneously?  Are any bits reserved to identify what is being sent
to the controller if they are sent separately?

Thanks for the info!

73, de John, KD2BD

-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
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