Abstract: A wide band, wide area FM-SCA radio system has a central station that transmits multiple audio signals and digital data signals through a satellite network to FM stations participating in the system. Each FM station demodulated and time multiplexes the audio and digital signals with a control signal to form a first baseband waveform having a frequency range corresponding to the SCA frequency bandwidth.The first baseband waveform and a regular FM baseband waveform are combined into a composite band waveform that is single-sideband modulated onto the station carrier for retransmission to FM-SCA receivers in the coverage area.Each FM-SCA receiver demodulates the received signal and separately processes the regular FM signal, the FM-SCA audio signals, and the FM-SCA digital data signals. A user interface is provided for audio output selection.