Discovery Drive is a two-axis rotator designed for the Discovery Dish: give it a target and it drives azimuth and elevation to hold the antenna on it, so satellite passes and moving sources can be tracked without a hand on the mount. It also does antenna gain-pattern measurements, turning a modest receive dish into a programmable RF experiment platform. For anyone working with weather satellites, L-band, or amateur radio sources, the rotator is the part that turns a fixed dish into an instrument.
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