| Title | QM/PSK Voice/Data Modem |
|---|---|
| Record ID | 40455 |
| Personal Name Creator |
Lerner, T.; McChesney, J. |
| Source | 96p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. Department of Transportation. Federal Aviation Administration |
| Publication Date | 19760301 |
| Language | English |
| Abstract | Two Quadrature Modulation/Phase Shift Keyed (QM/PSK) Voice/Data 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 unti which provides for one-way communication of voice and/or 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 transmitter/receiver at 70 MHz intermediate frequency. The report contains design theory, circuit descriptions, diagrams, calibration procedures, and laboratory test results. |
| Public Note | Introduction, General description, Quadrature modulation techniques, System design, Modulator, voice processing, Data code generator, Quadrature modulator, Up-converter module, Demodulator, Down-converter, Coherent demodulator, C/N measurement, Audio processing, Data decoder and clock synchronization, Code synchronization and error detector, System test results, Voice intelligibility tests, Data error rate tests, Carrier acquisition, C/N calibration, Schematic diagrams, Appendix |
| Rosap ID | dot:9276 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9276 |
| TRT Terms | Modems; Modulation; Voice communication |
| General Subjects | Modems; Digital data link; Applications technology satellite; Hybrid-modem systems; Quadrature modulation techniques; Up-converter modulator; AEROSAT; ATS-6 satellite; DCPSK encoder |
| Classification | NTL - AVIATION - Air Traffic Control |
| Geographical Coverage |
United States |
| OCLC | 3587438 |
| Contract Number | DOT-TSC-631 |
| Report Number | DOT-TSC-FAA-76-05; FAA-RD-76-63 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/40000/40400/40455/DOT-TSC-FAA-76-5.pdf |
| Format | |
| Database | NTL Digital Repository |