How NASA Engineered Audio Communication for Human Spaceflight
SMRTR summary
NASA has developed sophisticated audio communication systems over six decades to enable astronauts to talk with Earth across vast distances, evolving from Mercury's simple 3-watt radio to Artemis II's software-defined radios that can be updated in flight. The engineering breakthroughs include consolidating all communications onto a single frequency band during Apollo and developing systems that gracefully handle power failures and signal delays.
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