Echo 1

ECHO!!!The experimental communications relay satellite Echo 1 is launched into orbit by NASA. A 100-foot metalized Mylar balloon, Echo 1 is a demonstration of passive signal relay, carrying no powered transmitters of its own; its reflective surface simply bounces signals back to Earth. Microwave signals, radio, telephone and TV signals are all successfully relayed via Echo 1; it remains in orbit for four months.

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