FIELD: digital communications. SUBSTANCE: data signals are transmitted in proposed system using proposed method at unknown frequency within known frequency range. Frequency range is divided in receiver into plurality of frequency bands each having width shorter than error in data signal transmission frequency. Data signal is detected in at least one of these frequency bands and data signals detected are demodulated. In this way low-cost transceiving can be ensured enabling two-way communication between receiver and transceiver. EFFECT: enhanced operating range of transmitter without increasing its size and cost. 50 cl, 6 dwg
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