| 摘要 |
PURPOSE:To prevent power from being consumed unnecessarily by controlling transmission power by deciding successively the received result of a receiving means. CONSTITUTION:A CPU block 10 instructs a transmission output level to a transmission output control part 2 through a line 6 in order to obtain the lowest transmission level capable of communication, and subsequently, it sends test data to a transmission part 4 through a transmission data line 7, and emits a radio wave from an antenna 1. On the other hand, when an opposite party side receives normally the test data, it returns the test data back, and the CPU block 10 receives it to a reception part 5 through the antenna 1, and decides it to be normal reception, and next, it repeats this work by lowering the transmission level. Besides, when the test data is not normally received, namely, in the case the CPU block 10 can not receive the returned data, it decides it to be a transmission error, and instructs the transmission level higher than preceding one again to the transmission output control part 2 and executes similar work, and repeats this work until the reception becomes available. Thus, the power consumption can be saved. |
