FIELD: signalling facilities. SUBSTANCE: transceiving system of safeguard signalling has transducer unit, transmitter, transmitting aerial, receiver, first frequency generator and signalling device. Output of transmitter is connected with transmitting aerial and receiving aerial is connected with input of receiver. The system also has receiver control unit, pulse generator, coder, decoder and second frequency generator. Output of transducer unit is connected to pulse generator input whose output is connected via coder to input of transmitter. Receiver output is connected to input of decoder whose output is connected with inputs if first frequency generator and receiver control unit whose output is connected with input of second frequency generator. Outputs of first of signalling device. EFFECT: simplified design, reduced overall dimensions and increased reliability. 7 cl, 9 dwg
