@AkaSci as my brother (who still works at JPL) reminded me, they're transmitting 1.5 bits per photon. The sophistication of the signal processing is still insane, decades after its deployment.
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3 years later
From my brother @ JPL:
"On November 18 at 10:16:07 UTC, Voyager 1 will be 1 light-day (25.902 billion KM) away from Earth. Its magnetometer and plasma sensor are still on and operating. Other 8 instruments have been switched off to reduce power drawn from the fading RTG.
I wonder if the vidicon tubes are still operational."
NASA / JPL are holding a public event next week to mark the 1 light-day occasion https://www.jpl.nasa.gov/news/nasa-invites-media-public-to-join-voyager-1-one-light-day-activities/
@AkaSci a note from 2015...