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We build a Phase Locked Loop (PLL) FM demodulator for extracting the Apollo downvoice from its subcarrier, using the classic 7046B IC. But in the meantime, as luck would have it, NASA's own S-band receiver's PLL seems to have gone bonkers, and we can't lock to the spacecraft microwave downlink anymore! So we'll get very hands on with PLLs in this episode. Expect a healthy dose of PLL elevator music.
Apollo Comms Playlist: • Apollo Comms Part 1: O...
Older video on Fractional-N PLLs, used for frequency synthesis: • HP 3325A Bonus Materia...
Links to doc:
www.curiousmarc.com/space/apo...
virtualagc.github.io/virtuala...
www.ibiblio.org/apollo/
www.ibiblio.org/apollo/Docume...
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Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
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