CuriousMarc | Apollo Comms Part 19: Pre-Modulation Processor Grand Explanation @CuriousMarc | Uploaded 2 years ago | Updated 2 days ago
In preparation for powering up the Apollo Pre-Modulation Processor or PMP, we need look in detail at its functions and operation. The Collins PMP is the heart of the communication system. And boy, it sure is complicated!

Hi-res colored schematics to follow along:
curiousmarc.com/space/apollo-s-band-communications#h.c6wnrxe9yquc

Ken's blog article about the PMP:
righto.com/2022/07/reverse-engineering-apollo-spacecrafts.html

Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb

Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo

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00:00 The PMP is at the center of everything
03:00 PMP high level block diagram (with elevator music)
08:19 PMP low level block diagram (still with elevator music)
17:27 Conclusion and next steps