FIELD: radio engineering, in particular, transmission of additional code or text messages in parallel to broadcast FM program, for example for drivers or police. SUBSTANCE: device has adder, two controlled filters, three units of phase detection, phase modulator, phase demodulator, phase shifter, controlled oscillator and frequency generator. EFFECT: increased distance and quality of transmission due decreased mutual interference of channels of main and additional information down to level of modern standards, increased field of application due to use of modified stationary equipment. 2 cl, 2 dwg
