Radio relay system with a multiplex separation circuit and control for providing time delay multiplex operation of receiver and transmitter

A radio relay system comprising:

• a first mobile communication device for transmitting a radio carrier wave;
• a second mobile communication device for receiving a radio carrier wave;
• a radio relay device receiving said radio carrier wave transmitted by said first mobile communication device and transmitting said radio carrier wave thus received to said second mobile communication device;
• and
• wherein said radio relay device comprises:
• an antenna for transmission and reception of said radio carrier wave;
• a signal receiver for receiving said radio carrier wave from said first mobile communication device;
• a signal transmitter for transmitting said radio carrier wave to said second mobile communication device through said antenna;
• a switch for selectively connecting said signal receiver and signal transmitter to said antenna;
• a multiplex separation circuit having a first input terminal coupled to said signal receiver and a first output terminal coupled to said signal transmitter, said separation circuit being responsive to a received signal from said antenna and said signal receiver for generating an output base band signal and being responsive to an input base band signal coupled thereto for generating a transmission signal having a predetermined time delay with respect to said input base band signal, and wherein said transmission signal generated in response to an input base band signal from different sources have mutually different time delays for preventing mutual interference therebetween;
• and
• control circuit means coupled to said switch, said signal receiver, said signal transmitter, and said multiplex separation circuit for providing time delay multiplex operation of said signal receiver and said signal transmitter.