Development of two-way radio communication using the Subsidiary Communication Authorization (SCA)

• Main Authors: Galang, Erwin V., Lopez, Luis A., Sison, Garry V.
• Format: text
• Language: English
• Published: Animo Repository 1994
• Subjects: Digital communications; Pulse-code modulation; Signal theory (Telecommunication); Telecommunication systems; Radio > Transmitters and transmission; Subsidiary Communication Carriers (SCA); Multiplexing
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/6652
• Institution: De La Salle University

Different communication systems exist but their uses have been limited to each of their capabilities. The project is a communication system that would avail of the use of radio communications and the FM broadcast system. It is basically a repeater for the radio communication system utilizing the FM broadcast transmission through the SCA bandwidth. The system has two subsystems, one for the transmitter and the other for the receiver. The transmitter system would consist of a transmitter in the form of a portable transmission of information to a radio receiver and as an input to the SCA generator for broadcast by the FM transmitter. The receiver system includes an FM tuner, SCA demodulator and audio amplifier. The two systems simulate a one-way (simplex) communication. Realization of a two-way (full-duplex) and long range communication can be achieved by having two similar systems with the two broadcast stations relatively apart. The traditional SCA signal to be used as a medium can also be used for other functions, e.g., voice, data, music and paging. The thesis would underscore the concepts of SCA.