Pulse or digital communications – Repeaters – Testing
Patent
1988-01-25
1989-05-30
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 90, 375 97, 329 2, 455142, H04B 116
Patent
active
048357928
ABSTRACT:
A dual purpose receiver operable both on FM analog (voice) and MSK digital (data) signals has a demodulation section having a selectable time delay D.sub.1 for processing MSK digital signals and a time delay D.sub.2 for processing FM analog signals. A switch permits selection of the time delay for the demodulating mode desired. A second switch set according to how the first switch is set connects a digital processing circuit or an analog processing circuit to the output of the demodulation section. Small frequency errors due to frequency drift of the local oscillator or signal source and doppler effects can be eliminated by an automatic frequency control (AFC) circuit responsive to the output of the demodulator in the analog mode, and through a third switch responsive to a signal developed by mixing the input signal with the input signal delayed by a time delay D.sub.1, and mixing the output of that mixer with the binary output of the receiver in the MSK mode.
REFERENCES:
patent: 2416911 (1947-03-01), Crosby
patent: 3348168 (1967-10-01), Melchior et al.
patent: 4467360 (1984-08-01), Fosse
Francis D. Natali, AFC Tracking Algorithms, IEEE Transactions on Communications, vol. Com-32, No. 8, Aug. 1984, pp. 935-947.
Faramaz Davarian and Joe Sumida, Hardware Simulator Assists Mobile Satellite Experiment, 35th IEEE Vehicular Technology Conference, pp. 238-245, May 1985.
K. J. P. Fonseka and N. Ekanayake, Differential Detection of Narrow-Band Binary FM, IEEE Transactions on Communications, vol. Com-33, No. 7, Jul. 1985, pp. 725-729.
F. Davarian, M. Simon and J. Sumida, DMSK: A Practical 2400-bps Receiver for the Mobile Satellite Service, JPL Publication 85-51 (MSAT-X Report No. 111)., pp. 1-35, Jun. 15, 1985.
California Institute of Technology
Safourek Benedict V.
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