Voyager 1 stops communicating with Earth

Re:Voyager 1 stops communicating with Earth by throwup238 on Friday December 15, 2023 @10:03AM (#38654837)

TFA: >I will use a recording that was done back in 30 December 2015 with the Green Bank Telescope in the context of the Breakthrough Listen project.

That recording was made in 2015 on a modern radio telescope, it is not from a tape.

The GP has the details wrong though: when the Voyager design was finalized in the early 70s with the Viterbi encoder, there wasn’t enough computational power to decode the signal. By the time it launched in ‘77, there was enough and it launched with the Viterbi encoder enabled.

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Re:Voyager 1 stops communicating with Earth by Gibbon1 on Saturday December 16, 2023 @03:52PM (#38667556)

I wrote test firmware for a very early spread spectrum transceiver that used something close to Viterbi encoding. It consumed 220mA in receive mode and 60-120mA in transmit mode. I was told some of that was the RF amps and ADC but a lot of it was the decoder.

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