Apollo Comms Part 29: Downvoice

We back out the last remaining modification from our NASA receiver and return it to its original Apollo voice channel. If we are successful, we'll get to hear the voice from the astronauts the exact same way it was transmitted during the missions. And I hopelessly butchered the name of our hero engineer that left the helpful notes on the equipment, it's Frank Landspurg, not David Landsman! Bravo Mr. Landspurg. His obituary says that he was working for Motorola and supporting the Apollo missions, and passed away in 2014.

Apollo Comms Playlist:    • Apollo Comms Part 1: Opening the S-Ba...  

Links to doc:
https://www.curiousmarc.com/space/apo...
https://virtualagc.github.io/virtuala...
https://www.ibiblio.org/apollo/
https://www.ibiblio.org/apollo/Docume...

Elevator Music Credit: Crinoline Dreams by Kevin MacLeod

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00:00 Our Apollo receiver has been modified
05:20 Reverting the modification
07:41 Retuning the filter assembly
11:40 First receiver tests
13:38 How to extract downvoice with a ham radio
15:45 First voice trials, not working!
16:49 Tracking the fault in the spacecraft transmitter
20:35 Receiving downvoice!

Correction: 03:26 Frank Landspurg (not Landsman)
Correction: 05:09 Frank Landspurg (not Dave Landsman)