After Silence, NASA's Voyager Finally Phones Home - With a Device Unused Since 1981

Somewhere off in interstellar space, 15.4 billion miles away from Earth, NASA's 47-year-old Voyager 'recently went quiet,' reports Mashable.
The probe 'shut off its main radio transmitter for communicating with mission control...'
Voyager's problem began on October 16, when flight controllers sent the robotic explorer a somewhat routine command to turn on a heater. Two days later, when NASA expected to receive a response from the spacecraft, the team learned something tripped Voyager's fault protection system, which turned off its X-band transmitter. By October 19, communication had altogether stopped.

The flight team was not optimistic. However, Voyager 1 was equipped with a backup that relies on a different, albeit significantly fainter, frequency. No one knew if the second radio transmitter could still work, given the aging spacecraft's extreme distance.

Days later, engineers with the Deep Space Network, a system of three enormous radio dish arrays on Earth, found the signal whispering back over the S-band transmitter. The device hadn't been used since 1981, according to NASA.
'The team is now working to gather information that will help them figure out what happened and return Voyager 1 to normal operations,' NASA said in a recent mission update.
It's been more than 12 years since Voyager entered interstellar space, the article points out. And interstellar space 'is a high-radiation environment that nothing human-made has ever flown in before.

'That means the only thing the teams running the old probes can count on are surprises.'

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