Project Echo

Satellite expérimental de communication
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Echo satellites
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Project Echo was the first passive communications satellite experiment. Each of the two American spacecraft, launched in 1960 and 1964, was a metalized balloon satellite acting as a passive reflector of microwave signals. Communication signals were bounced off them from one point on Earth to another.
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Echo 1
Echo satellites
Echo (satellite)
Echo satellite
Echo 2 (satellite)
Echo communications satellite project
Echo project
Echo 1A
Echo II (balloon)
Echo 2 (balloon)
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