NULL RADIOMETER Russian patent published in 1994 - IPC

FIELD: weak signal reception. SUBSTANCE: null radio range finder has directional coupler 1, attenuator 2, noise generator 3, directional current generator 4, modulator 5, receiver 6, pulse amplifier 7, high-frequency filter 8, synchronous filter 9, analogue comparator 10, matched load 11, thermostated plate 12, down counters 13 and 14, reversible binary counter 15, binary counter 16, clock pulse generator 17, pulse-width signal generator 17, pulse-width signal flip-flop 18, modulation half period flip-flop 19, digital comparator 20, decoder 21, matching amplifiers 22-24, pulse shaper 25, AND gates 26,28,30,32, OR gates 31,33, inverters 27,29, antenna 34. EFFECT: widened frequency range. 7 dwg