FIELD: guard devices, particularly adapted for object protection against intrusion, namely electronic locks with radio channels.
SUBSTANCE: electronic lock comprises mechanical locking device 1, power on-off switch 2, executive mechanism 3, radio transmitter 4, radio receiver 5, encoding means 6 with two oscillatory circuits 7, 8 and frequency conversion means 9. Lock also has modulation code generator 10, phase key 11, multipliers 12, 13, narrow-band filter 14, low-pass filter 15, memory unit 16, correlator 17, threshold unit 18, multipliers 31, 32, narrow-band filter 33, phase inverter 35, 36, low-pass filter 34, subtracter 37 and low-frequency voltage generator 38.
EFFECT: increased noise immunity during compound signal receiving due to decreased narrow-band noise received via main channel.
4 dwg
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