AMPLIFICATION DEVICE FOR ADJUSTMENT FOR BUS AMPLIFIER OF CATV SYSTEM

摘要

PURPOSE: To exchange equalizing/pseudo line units and an amplification unit without stopping waves. ;CONSTITUTION: This amplification device 31 for adjustment is connected among a status signal transmission terminal 21, an output monitoring terminal 23 and a branching monitoring terminal 24. Transmission loss from the branching side of a third branching device 10 and a fifth branching device 44 to a main line output side and a branching output side is inverse coupling loss 40dB and is large and branching high frequency signals amplified in the amplification device 31 for the adjustment are not outputted to the amplification unit 8. A branching amplification unit 41 and a main amplification unit 8 are detached. At the moment of detaching them, impedance viewing the upstream side of a branching line and the upstream side of a main line from the input terminals of the fifth branching device 44 and a second branching device 7 becomes infinite. The transmission loss from the branching side of the fifth branching device 44 and the second branching device 7 to the output side of the brancing line and the output side of the main line becomes the 20dB of branching loss. Outgoing high frequency signals are supplied through the amplification device 31 for the adjustment with the approximate attenuation amount 0 to the signal level of branching output terminals BR1-BR4, an output terminal 3 and an input terminal 2.;COPYRIGHT: (C)1996,JPO