Media Summary: Important step to get right! We figure out the 120V 400 Hz 3 phase power connections and the power supply control relays from ... We demonstrate a locked bidirectional link between Earth and our It's aliiive! We very cautiously turn on our

Apollo Comms Part 4 Transponder - Detailed Analysis & Overview

Important step to get right! We figure out the 120V 400 Hz 3 phase power connections and the power supply control relays from ... We demonstrate a locked bidirectional link between Earth and our It's aliiive! We very cautiously turn on our We fix our Updata Link Test box by solving the mystery of the missing analog components. We X-ray mysterious Motorola modules ... We back out the last remaining modification from our NASA receiver and return it to its original We return our modified NASA transmitter and receiver to their original

We try to bring up the original test equipment receiver for the phase modulated link. Does not go as planned, of course. Our first successful video transmission using the original

Photo Gallery

Apollo Comms Part 4: Transponder power up preparation, and more original equipment found.
Apollo Comms Part 6: First tone transmission, to the Moon and back!
Apollo Comms Part 5: Transponder first power on.
Apollo Comms Part 18: Solving the mystery of NASA's Updata Link box missing parts
Apollo Comms Part 3: Inside the S-Band Transponder
Apollo Comms Part 25: Apollo-HP Nixie Space Clock
Apollo Comms Part 1: Opening the S-Band Transponder and Amplifier
Apollo Comms Part 29: Downvoice
Apollo Comms Part 10: Apollo SDR reboot and first voice transmission!
Apollo Comms Part 34: Trying every function of the Apollo command system
Apollo Comms Part 13: We successfully repair both our NASA transmitter and receiver!
Apollo Comms Part 7: NASA phase modulated receiver
View Detailed Profile
Apollo Comms Part 4: Transponder power up preparation, and more original equipment found.

Apollo Comms Part 4: Transponder power up preparation, and more original equipment found.

Important step to get right! We figure out the 120V 400 Hz 3 phase power connections and the power supply control relays from ...

Apollo Comms Part 6: First tone transmission, to the Moon and back!

Apollo Comms Part 6: First tone transmission, to the Moon and back!

We demonstrate a locked bidirectional link between Earth and our

Apollo Comms Part 5: Transponder first power on.

Apollo Comms Part 5: Transponder first power on.

It's aliiive! We very cautiously turn on our

Apollo Comms Part 18: Solving the mystery of NASA's Updata Link box missing parts

Apollo Comms Part 18: Solving the mystery of NASA's Updata Link box missing parts

We fix our Updata Link Test box by solving the mystery of the missing analog components. We X-ray mysterious Motorola modules ...

Apollo Comms Part 3: Inside the S-Band Transponder

Apollo Comms Part 3: Inside the S-Band Transponder

We take a closer look at the S-Band

Apollo Comms Part 25: Apollo-HP Nixie Space Clock

Apollo Comms Part 25: Apollo-HP Nixie Space Clock

We power up

Apollo Comms Part 1: Opening the S-Band Transponder and Amplifier

Apollo Comms Part 1: Opening the S-Band Transponder and Amplifier

We open the microwave

Apollo Comms Part 29: Downvoice

Apollo Comms Part 29: Downvoice

We back out the last remaining modification from our NASA receiver and return it to its original

Apollo Comms Part 10: Apollo SDR reboot and first voice transmission!

Apollo Comms Part 10: Apollo SDR reboot and first voice transmission!

We use an SDR radio to talk to our

Apollo Comms Part 34: Trying every function of the Apollo command system

Apollo Comms Part 34: Trying every function of the Apollo command system

We finally have our

Apollo Comms Part 13: We successfully repair both our NASA transmitter and receiver!

Apollo Comms Part 13: We successfully repair both our NASA transmitter and receiver!

We return our modified NASA transmitter and receiver to their original

Apollo Comms Part 7: NASA phase modulated receiver

Apollo Comms Part 7: NASA phase modulated receiver

We try to bring up the original test equipment receiver for the phase modulated link. Does not go as planned, of course.

Apollo Comms Part 21: TV from the Moon

Apollo Comms Part 21: TV from the Moon

Our first successful video transmission using the original