Input (grade 9): Its data were checked and verified against data from the Deep Space Network station at Madrid, Spain.AMSAT-DL article in German; ARRL article in English This is believed to be the first such tracking of Voyager 1.
Output (grade 8): Its data were checked and verified against data from the Deep Space Network station at Madrid, Spain. AMSAT-DL article in German; ARRL article in English.