| 摘要 |
PURPOSE: To exchange a unit for constituting a bus amplifier, an equivalent unit, a pseudo line unit and an amplification unit without stopping waves. CONSTITUTION: This amplification device 30 for adjustment is connected between a status signal transmission terminal 21 and an input monitoring terminal 22. Transmission loss from the branching side of a second branching device 7 to a main line output side is inverse coupling loss 40dB and is large and the branching high frequency signals amplified in the amplification device 30 for the adjustment are not outputted to the amplification unit 8 practically. The pseudo line unit 6 is detached. Since impedance viewing the upstream side of a mail line from the input terminal of the second branching device 7 becomes infinite at the moment of detaching it, the transmission loss from the branching side of the second branching device 7 to the output side of the main line becomes 20dB of branching loss. Thus, outgoing high frequency signals are supplied through a transmission caracteristics adjustment unit 302 and an adjustment amplification unit 301 to the amplification unit 8 with the approximate attenuation 0 to the signal level of the input terminal 2. |
