The development status of an amateur satellite called Nexus is summarized in this paper. NEXUS is under development now to achieve four primary missions using newly developed amateur radio components, i.e. a PI/4 shift QPSK transmitter,a FSK transceiver, a liner transponder, and a camera system. The PI/4 shift QPSK transmitter can transmit at a rate of 38400 bps in amateur radio band. The FSK transceiver can change the bit-rate between 600 and 14400 bps. The liner transponder can relay the data in the orbit. The Camera system can shoot the FHD images at smaller size than the commercially available cameras. The author believes that the success of the mission will result in commercializing those amateur radio components. Furthermore the author hopes that these development efforts will contribute to the micro/nanosatellite community and make the CubeSat development more easily.

Key Words: PI/4 shift QPSK transmitter, Linear transponder, FSK transceiver, Amateur radio satellite