The Telemetry System switched eight channels of information into an audio oscillator whose output modulated both transmitters.
The eight telemetry channels were:
0: HI identification
1: Battery current drain
2: X axis horizon sensor
3: Battery voltage
4: Y axis horizon sensor
5: Internal temperature
6: X axis horizon sensor
7: Skin temperature
The HI keyer transmitted the traditional amateur radio operator's greeting, Hi, in morse code.
Each channel was sampled for 6½ seconds for a 52 second telemetry cycle. The audio frequencies ranged from 400 Hz to about 3 kHz. For each of the battery voltage, current and temperature telemetry channels, except zero, there was a calibration graph provided in the Users' Guide to convert the audio frequency into the parameter being measured.