| 摘要 |
PURPOSE:To avoid the effect of interference or fading by selecting a frequency of a carrier and an antenna when an interference wave or fading is in existence around a station and the communication state is deteriorated. CONSTITUTION:A reception signal inputted from an antenna 2 is inputted to a changeover request detection circuit 16 via an antenna multicoupler 5, a receiver 8 and a reproduction circuit 10. The changeover request detection circuit 16 detects a transmission frequency changeover request multiplexed in a time slot of each frame from a host station and sends changeover request information to a transmitter control circuit 17 and a transmission antenna changeover control circuit 18. Upon the receipt of the information, the transmitter control circuit 17 sends a transmission frequency switching request and a transmission output adjustment request to the transmitter 7, the transmission antenna changeover control circuit 18 outputs a switching request of the transmission signal having been sent from the antenna 2 into the antenna 3, then the communication is started with a different host station at a new frequency. |
