Apollo 4, which was unmanned, transmitted in the Unified S-band (USB) and tested the entire Manned Space Flight Network system. USB was groundbreaking in that command, telemetry, voice and television was transmitted and received on a single link. The single link allowed excess cables and wires to be removed from the capsule, making it lighter.
Apollo 4, which was unmanned, transmitted in the Unified S-band (USB) and tested the entire Manned Space Flight Network system. USB was groundbreaking in that command, telemetry, voice and television was transmitted and received on a single link. The single link allowed excess cables and wires to be removed from the capsule, making it lighter.