| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable bidirectional relay amplifier in which oscillation caused by sneak path is suppressed in the bidirectional communication using the same frequency. SOLUTION: An outgoing amplifier 3 is set to ON and an incoming amplifier 4 is set to OFF. When a base station 57 sends a signal through a control channel, the signal is distributed in an outgoing direction by a circulator 1, detected by a coupling circuit 14 and given to a control circuit 9. The control circuit 9 extracts a frame synchronizing signal and a time slot signal or the like and recovers a synchronizing signal for time division simultaneous transmission reception and controls on/off of amplifier circuits 3, 4 via interface circuits 12, 13. On the other hand, when a signal from a mobile station 58 is received, the signal is distributed by a circulator 2 and sent to the base station via an amplifier 4 and the circulator 1. |
