TRANSCEIVING DEVICE Russian patent published in 2003 - IPC

FIELD: radio engineering; communication systems of tactical control sections. SUBSTANCE: device has low- frequency amplifier, modulator, exciter, power amplifier, two antennas, intermediate-frequency channel, demodulator, adder, delay circuit, subtracter, multiplier, integrator, switch, broadband phase-keyed signal receiver, broadband phase-keyed signal shaper, broadband phase-keyed signal copy shaper, synchro-phase filter, adjustable amplifier, two frequency synthesizers, and high-frequency amplifier. Proposed design of device provides for simultaneous transmission in data frequency band allocated for communications over two channels with analog data transmitted over one of them using narrow-band modulation method and digital data over other channel using noise-immune broad-band modulation method. In the process narrow-band signal is deliberately made noisy which makes it impossible to adequately demodulate it without knowing structure of pseudorandom trains used in shaping broadband signal. EFFECT: improved hiding of broadband signal and its protection against interception. 1 cl, 4 dwg