To perform confirmation/retrieval works for short time without requiring the number of persons by transmitting radio waves to a receiver mounted on a part and a material from a retrieval transmitter at hand and retrieving the location by transmitting sound or light or both sound and light by the receiver.
As a frequency of a radio wave transmitted from a transmitter, 315 MHz is used and a receiver is selected by a receiver cord modulated digitally. Namely, a signal constituted 6f a preample bit, a start bit, a data bit and a stop bit is transmitted to each receiver by communication speed 1 kbps. The receiver side responds by each determined receiver cord in the data bits of a received signal. The receiver cord is constituted of 9 bits which are included in the data bit succeeding after 21 bits in total of the preample bit and the start bit. When a cord stored in the receiver and a cord of a received radio wave coincides, the receiver produces sound by a buzzer for about two seconds or turns on an LED lamp.
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HASEGAWA SO
SUZUKI YASUYUKI
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