Telecommunications – Transmitter and receiver at separate stations
Patent
1983-12-22
1985-09-10
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
455 45, 455 59, 455 70, 455102, 455110, 455212, 455228, H04B 700, H04B 104, H04B 116
Patent
active
045411182
ABSTRACT:
A single sideband communications system conveying a message through a transmitter to one or more predetermined receivers which are enabled by a coded squelch signal unique to the predetermined receivers is disclosed. The transmitter comprises means to angle modulate both the pilot signal and the information bearing single sideband signal with the coded signal at a predetermined deviation and to transmit the resulting signal.
Each receiver frequency control means tracks the frequency excursions of a selected portion of the transmitted signal up to predetermined limits so that the message can be demodulated without frequency distortion being introduced. Each receiver demodulates the coded squelch without interfering with the message demodulation or tracking functions and activates the receiver squelch of those preselected receivers.
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R. W. Gibson & R. Wells, "The Potential of SSB for Land Mobile Radio", 29th IEEE VTG Conference, Mar. 1979.
R. W. Gibson, "Land Mobile SSB: Promises and Problems".
P. H. Jacobs, "Improving Spectrum Efficiency with ACSB", Communications, Mar. 1981.
Taub & Schilling, Principles of Communications Systems, McGraw-Hill Book Co., 1971, pp. 140-142.
IEEE Standard Dictionary of Electrical and Electronics Terms, John Wiley & Sons, 1972, pp. 231-232.
Eastmond Bruce C.
Richardson Julian H.
Gillman James W.
Jenski Raymond A.
Motorola Inc.
Ng Jin F.
Southard Donald B.
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