QM/PSK Voice/Data Modem.
Final rept. Jan 74-Apr 75,
BELL AEROSPACE CO BUFFALO N Y
Pagination or Media Count:
Two Quadrature ModulationPhase Shift Keyed QMPSK VoiceData Modem systems have been developed as part of the satellite communications hardware for advanced air traffic control systems. These systems consist of a modulator and demodulator unit which provides for the one-way communication of voice andor data signals. The modulator and demodulator unit provides simultaneous transmission of analog voice and digital data signals multiplexed on a single carrier, using quadrature modulation techniques. The modem interfaces with the transmitterreceiver at 70 MHz intermediate frequency. The report contains design theory, circuit descriptions, diagrams, calibration procedures, and laboratory test results. Author
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