| 摘要 |
PROBLEM TO BE SOLVED: To provide a CATV system in a building for transmitting an incoming signal from an external interactive CATV system and a satellite receiving signal received by a satellite receiving antenna to the terminal side, and delivering an incoming signal from the terminal side to the interactive CATV system in which each signal can be amplified normally using one amplifier and the amplifier can be provided inexpensively. SOLUTION: In an amplifier, circuits 60, 70 and 80 for amplifying respective signals form a common amplification circuit board 50 provided with terminals T1-T3. In the amplification circuit board 50, a satellite input terminal T2 is disposed between an outgoing input/incoming output terminal T1 and a satellite and outgoing output/incoming input terminal T3, the satellite amplification circuit 80 is formed at a position closest to the terminal, and the incoming amplification circuit 60 is formed at a position farthest from the terminal. The amplification circuit board 50 is surrounded by a shield plate, and a shield plate for isolating the signal paths to respective amplification circuits and respective circuits is stood on the surface of the substrate. |
