| 摘要 |
FIELD: transport; car protection from hi-jacking. SUBSTANCE: device has supply source 1, current limiting resistor 2, remote controlled selector switch 3 with two antiphase windings 4 and 5, light emitting diode 6, hermetically sealed contact reed relay 7, ignition switch 8, intermittent signal generator 9, electromagnetic relay winding 10, master oscillator 11, phase manipulator 12, transmitter 13 and transmitting antenna 14, all mounted on car. At receiving station the following devices are installed: receiving antennas 15, receiver 16, frequency double 17, first narrow-band filter 18, scale-of-two frequency divider 19, frequency detector 20, flip-flop 21, balance switch 22, phase detector 23, indicator 24, band-pass filter 25, phase inverter 26, first adder 27, local oscillator 28, 90-degree first phase shifter 29, first mixer 30, second mixer 31, first intermediate frequency amplifier 32, second intermediate frequency amplifier 33, second 90-degree phase shifter 34, second adder 35, multiplier 36, second narrow band filter 37, amplitude detector 38 and switch 39. EFFECT: improved sensitivity, selectivity and noise resistance of radio channel. 1 dwg |
