| 摘要 |
PROBLEM TO BE SOLVED: To reduce an adjustment time of a detection value of a reception input level. SOLUTION: An RF unit 1 of a radio transmitter-receiver detects a level of signal transmission/reception and a reception input of a signal and produces an RSSI(RF level estimate value) signal. A microprocessor 3 checks the level of a received radio wave, based on the A/D-converted RSSI signal, and controls transmission of a radio wave(data signal) when the level of the received radio wave is a specified level or below. Furthermore, the microprocessor 3 executes control of storing an A/D conversion output at two specified levels or over in a RAM 5 and also control of generation of a correction table for correcting the detection level of the received input (that is, the level of the RSSI signal) through a prescribed arithmetic operation using the stored data. The correction table is stored in a programmable ROM 4 and its content is used for transmission control of a radio wave as a correction value of the RSSI signal being the detected reception input level. |
