Hi All I've been thinking about building a tracking system for my downlink as my asistant keeps loosing track of the plane. I know it can be done using the gps data sent to the ground and into a PC, the PC then moves a stepper motor with the aerial on. Is it possable to do this with out the PC ? Maybe with a micro-controller to make a neat all in one unit, or is it to much for a micro-controller to handle ? I it possable to track the transmitter/plane with out the gps and using the RF ? If you used 2 patch aerials next to each other pointing say 20deg apart and fed the signal to 2 recievers, could you use the AGC signal to drive the patch aerials right or left and balance in the middle ? Terry UK