| 摘要 |
PURPOSE:To obtain a radio alarm device which can confirm the location position of a transmitter and is high in the crime prevention effect by composing of a transmitter to transmit intermittently a password code wave and a master device for alarm reception to receive and decode an intermittent code wave from the transmitter. CONSTITUTION:The digital signal inputted to a microcomputer 9 is the password code wave set and stored beforehand, and when the signal is inputted for a constant time, the microcomputer 9 judges to be a normal condition and the output of an alarm sound generating device 10 connected to the microcomputer 9 is held in the OFF condition. When the digital signal of the password code wave is not inputted to the microcomputer 9 even when the constant time passes, the microcomputer 9 judges to be an abnormal condition, the circuit of the alarm sound generating device 10 is turned ON and the alarm sound is generated. When the digital signal to disappear again is received two times continuously, the microcomputer 9 judges to be the normal condition and the alarm sound generating device 10 is turned OFF.
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