DUPLEX RADIO COMMUNICATION SYSTEM Russian patent published in 2002 - IPC

FIELD: radio communications; single-frequency duplex radio links including telephone ones. SUBSTANCE: system has two transceiver sets each incorporating signal source, modulator, transmitter, and also connected-in series receiver and demodulator; in addition it has signal receiver, control unit, and transceiver antenna whose input and output are connected to transmitter output and receiver input, respectively, and first output of control unit is connected to second input of receiver. Novelty is that it is provided in addition with signal compression device, signal expansion device, series-connected sync signal sensor, sync signal modulator, switch, and also sync signal demodulator whose input is connected in addition to receiver output and output, to input of control unit whose second and third outputs are connected to control input of signal compression device and to control input of signal expansion device, respectively and its fourth output is connected in parallel with sync signal input and with control input of switch; second input of the latter is connected to output of modulator and output, to transmitter input; signal source output is connected to input of signal compression device whose output is connected to modulator input; demodulator output is connected to input of signal expansion device whose output is connected to signal receiver input. EFFECT: provision for full duplex radio exchange at single operating frequency including by means of telephone signals. 3 dwg