Following recent communication issues, NASA's Voyager 1 spacecraft resorted to using a backup radio transmitter that has been inactive since 1981.
The interstellar explorer experienced a brief pause in communications after putting itself in a protective state to conserve power. This was triggered by a command sent on Oct. 16 from NASA's Deep Space Network (DSN) — a global array of giant radio antennas — instructing the spacecraft to turn on one of its heaters.
The mission's flight team first realized there was an issue with Voyager 1 on Oct. 18, when the spacecraft failed to respond to that command. The team later discovered that the spacecraft had turned off its primary X-band radio transmitter and instead switched over to its secondary S-band radio transmitter, which uses less power, according to a statement from NASA.
Source: www.space.com
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