>>> But the PTCB is looking at a tracking system that's little more 
>>> than a
>>> couple of sensors, a PIC (16F84: how quaint!), and a stepper 
>>> motor.

The (arguably) simplest tracker I've seen was a solar receiver 
floating in a tank. As the sun moved off centre the incident radiation 
caused heating of a flotation bag thereby increasing flotation on that 
side and caused the receiver to reorient towards the sun. A tank full 
of "eyeballs" tracked the sun in any direction so no adjustment was 
needed for time of day or season.



        RM


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