| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable a monitoring apparatus to control power supply to a plurality of transmission amplifiers for retransmission and prevent an overcurrent from flowing at the time of start of power supply to each of the amplifiers in a broadcast radio wave retransmission system for receiving broadcast radio waves and retransmitting them to an area where the broadcast radio waves cannot be received. <P>SOLUTION: A plurality of branching devices 8 are arranged on a transmission line from a reception antenna 2 to a terminal side via reception amplifiers 4 and a monitoring device 6, the broadcast radio waves are transmitted to transmission amplifiers 10 installed for each area to which the broadcast radio waves should be transmitted via each of the branching devices 8, and monitoring signals output from each of the transmission amplifiers 10 are transmitted to the monitoring device 6 side. Each of the branching devices 8 is provided with a constant voltage circuit for generating a DC constant voltage Vc (DC12 V) from a commercial power source. When a power feeding command signal (DC12 V) is input from the upstream of the transmission line; the branching devices 8 each supply the DC constant voltage Vc to the transmission amplifiers 10 as a power source, and output it to a branching device 8 in downstream as a power feeding command signal. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
