CuriousMarc | Apollo Comms Part 4: Transponder power up preparation, and more original equipment found. @CuriousMarc | Uploaded 2 years ago | Updated 2 days ago
Important step to get right! We figure out the 120V 400 Hz 3 phase power connections and the power supply control relays from misleading schematics. And Christmas comes up early in the form of original NASA communication test equipment.

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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- Samtec: connectors: samtec.com

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00:00 Recap of previous episodes
01:17 Transponder main connector
02:31 Overview of the transponder hookup schematics
04:22 Schematics wiring does not match our transponder
06:21 Activating the transponder relays should allow us to figure AC wiring
07:46 First power up of the transponder relays
08:26 Identifying the AC connections for the FM transmitter
10:53 Identifying the AC connections for the PM transponders
15:01 We found the original NASA ground test equipment!
17:53 First power up of the Transponder Mount
19:24 Recap and next steps