The ARRL Letter from The American Radio Relay League reports that. Pioneer 10 spacecraft sends last signal: Talk about weak-signal DX! NASA
says that after more than 30 years, it appears the venerable Pioneer 10
spacecraft has sent its last signal to Earth. Pioneer's last, very weak
signal was received on January 22. NASA engineers report Pioneer 10's
radioisotope power source has decayed, and it may not have enough power to
send additional transmissions to Earth. NASA's Deep Space Network (DSN)
did not detect a signal during the last contact attempt February 7. The
previous three contacts, including the January 22 signal, were very faint
with no telemetry received. The last time a Pioneer 10 contact returned
telemetry data was last April 27. NASA plans no additional contact
attempts for Pioneer 10, which is 7.6 billion miles from Earth. At that
distance, it takes more than 11 hours 20 minutes for the radio signal to
reach Earth. More information is available on the Pioneer 10 Web page