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RT @kenshirriff@twitter.com

How did the Apollo astronauts communicate from Moon orbit? They used a 20-Watt Traveling Wave Tube Amplifier. Let's see what's inside this 32-pound box.

🐦🔗: twitter.com/kenshirriff/status

@LaF0rge As it happens, my hangar landlord Jim was in charge of developing the communications for Apollo missions: voice, telemetry, and TV.
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