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About: Small Deep Space Transponder     Goto   Sponge   NotDistinct   Permalink

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The Small Deep Space Transponder is a transponder designed by JPL specifically for deep space probes. It unifies a number of communication functions - receiver, command detector, telemetry modulator, exciters, beacon tone generator, and control functions - into one 3-kg package. The SDST is designed to handle X band uplink and both X band and Ka band downlink. JPL estimates that performing the same functions with separate units (as was done previously) requires over twice the mass and 4 or 5 individual subassemblies.