FIELD: radio engineering; communication systems of tactical control sections. SUBSTANCE: proposed method involves generation of phase-keyed signal on sending end of radio link simultaneously with analog voice message transmitted by using narrow-band (frequency) modulation; this signal functions to transmit low-frequency digital information and is added to narrow-band voice signal. Total signal is processed simultaneously in linear channels of transmitter and receiver. EFFECT: enhanced noise immunity and security; enlarged amount of data transmitted. 1 dwg
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