Dissecting the Apollo voice comm system

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Topic: Dissecting the Apollo voice comm system

MOL
Member

Posts: 164
From: Los Angeles, CA
Registered: Oct 2004

posted 07-13-2022 12:22 AM

For those who may be interested, I found this blog post of someone who recently reverse-engineered the FM demodulator used in the onboard receiver of the Apollo spacecraft.

How did NASA communicate with the Apollo astronauts, hundreds of thousands of miles from Earth? The premodulation processor1 (below) was the heart of the communication system onboard the Apollo spacecraft. Its multiple functions included an FM radio for communication to the astronauts, implemented by the Voice Detector, the module second from the top. In this blog post, I reverse-engineer the circuitry for that module and explain how it worked.

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