| 摘要 |
PROBLEM TO BE SOLVED: To prevent communication disturbances to an adjacent channel by reducing an adjacent channel leakage power, due to distortion of a transmitting power amplifier. SOLUTION: When an own station transmits, a receiving frequency is set to the adjacent channel, and a receiving high-frequency switch 15 is connected to a directional coupler 9 side. Power within a transmitting band of the own station is band-limited by an IF filter 22 and a digital filter 28, and the adjacent channel leakage power is detected by and RSSI 24 or a power detector 29. A power amplifier 7 of a transmitter is bias-controlled, in response to a level of the adjacent channel leakage power, or a transmitting power is limited by a gain controller 6 to reduce the adjacent channel leakage power due to the distortion of the transmitting power amplifier. Thus, communication disturbances to adjacent channels is prevented. |
