| 摘要 |
PURPOSE:To provide a bidirectional relaying amplifier which relays and amplifies the signals of radio frequency modulated by a TDD (time division simultaneous speech transmission/reception) system in both incoming and outgoing directions. CONSTITUTION:A bidirectional relaying amplifier defines the incoming and outgoing directions by the circulators 1 and 2, amplifies the signals by an amplifier circuit 3 or 4, and relays and amplifies the signals toward a base station 57 or a mobile station 58 through a coaxial cable 10 or an anti-mobile station antenna 52. Then a control microcomputer 9 controls the gain of the circuit 3 of 4 based on the detection outputs of the input level detector circuits 5 and 6 and the output level detector circuits 7 and 8 respectively. |
