| 摘要 |
PURPOSE:To attain the transmission of a transmission data efficiently with less power consumption by controlling the quantity of the output of a transmission means based on the transmitted transmission data and a received data. CONSTITUTION:In operating a transmission switch 2a, a data in a RAM8 is transmitted from an antenna 4 to a receiver via a transmission section 10. On the other hand, when the receiver receives the transmission signal, the receiver transmits the same signal as the received signal to a transmission station. The reply signal is compared with the transmission signal at a comparison discriminating section 13 and when they are the same signal, it is discriminated that the signal is received surely by a reception station. On the other hand, if they are dissident, it is discriminated that the transmission output is small and the reception station receives an erroneous signal, the comparison discrimination section 13 outputs a level-up signal, the same data is transmitted again to the transmission section 10 and the data is transmitted to the receiver by a transmission output boosted by one level by means of an amplification factor variable amplifier. Then the transmission of data while the transmission output is increased gradually is repeated until it is confirmed that the reception station receives surely the transmission signal. |
