The word TELEMETRY is derived from the Greek words 'tele' and 'meter', together they mean to measure from afar. Telemetry data from amateur satellites has been available since 1961. OSCAR I repetitively sent the CW message 'HI' at a speed related to the internal temperature of the spacecraft. The information gathered from this simple telemetry resulted in changes to the thermal coating and a lowering of the transmitter power for OSCAR Ⅱ, The primary purpose of telemetry is to monitor, encode, transmit, and decode data concerning the vital systems of the satellite. The telemetry information gleaned from all the earlier satellites has contributed to a more reliable, longer lasting and fuller featured satellite.
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