Conducting short-wave radio transmissions between ground-based amateur radio operators and a Shuttle-based
amateur radio operator was the basis for the Shuttle Amateur Radio Experiment (SAREX)-II.

SAREX communicated with amateur stations in line-of-sight of the orbiter in one of four transmission modes: voice,
slow scan television (SSTV), data or (uplink only) fast scan television (FSTV).

The voice mode was operated in the attended mode while SSTV, data or FSTV could be operated in either attended or
unattended modes.
During the mission, SAREX was operated by Payload Specialist Ron Parise, a licensed operator (WA4SIR),
during periods when he was not scheduled for orbiter or other payload activities.
A ground-based experiment to calibrate electro-optical sensors at Air Force Maui Optical Site (AMOS) in Hawaii was also conducted during the mission.
The Space Classroom Program: Assignment: The Stars project was carried out to spark student interest in science, mathematics and technology.
Mission Specialist Hoffman conducted the first classroom lesson taught from space on 7 December in support of this objective, covering material on the electromagnetic spectrum and the ASTRO-1 observatory.
A supporting lesson was taught from the ASTRO-1 control center in Huntsville.
Conducting short-wave radio transmissions between ground-based amateur radio operators and a Shuttle-based
amateur radio operator was the basis for the Shuttle Amateur Radio Experiment (SAREX)-II.
SAREX communicated with amateur stations in line-of-sight of the orbiter in one of four transmission modes: voice,
slow scan television (SSTV), data or (uplink only) fast scan television (FSTV).
The voice mode was operated in the attended mode while SSTV, data or FSTV could be operated in either attended or
unattended modes. During the mission, SAREX was operated by Payload Specialist Ron Parise, a licensed operator (WA4SIR),
during periods when he was not scheduled for orbiter or other payload activities. A ground-based experiment to calibrate electro-optical sensors at Air Force Maui Optical Site (AMOS) in Hawaii was also conducted during the mission. The Space Classroom Program: Assignment: The Stars project was carried out to spark student interest in science, mathematics and technology. Mission Specialist Hoffman conducted the first classroom lesson taught from space on 7 December in support of this objective, covering material on the electromagnetic spectrum and the ASTRO-1 observatory. A supporting lesson was taught from the ASTRO-1 control center in Huntsville.
STS-35