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| RELAY SATELLITE -- Technician adjusts heater element on the TDRS-H satellite before it undergoes testing in Hughes Space and Communications Company's new thermal-vacuum chamber. To simulate the harsh conditions of space, Hughes puts all its satellites through cycles of extreme heat and cold in a vacuum chamber. NASA ordered TDRS-H, I and J from Hughes in 1995. They are versions of Hughes' popular HS 601 model satellite. Each will have two 15-foot-diameter mesh springback antennas and a phased-array antenna, enabling the satellite to communicate with seven spacecraft simultaneously. TDRS-H is scheduled for launch this summer and TDRS-I and J next year. |
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