The paper describes the design, fabrication, and test of telemetry,
tracking and command (TT&C) subsystem on the microsatellite CKUTEX
(Cheng Kung University Technology EXperimental satellite). The objective
is to implement a communication subsystem indigenously for the
application to self-reliant microsatellite. The subsystem design, circuit
fabrication, test, as well as software development are performed to be
compliant with the CKUTEX communication requirements. The TT&C
subsystem consists of beacon broadcasting circuit, telemetry circuit, and
telecommand circuit. The beacon broadcasts with Morse code for the
ground station around the world for the tracking of the CKUTEX. In
contrast, the telecommand and telemetry are accessed by the CKUTEX
team for mission operation and control. The onboard TT&C module is
controlled through a microprocessor for mode transition, frequency
synthesis, data processing, and communication interface with other
subsystems. The overall subsystem is integrated and verified through the
end-to-end test.