| 摘要 |
PURPOSE:To position each terminal station at a correct channel at any time by a control station by providing collation part which collates radio frequencies in the control station and by changing over channels of the terminal station by sending a switching signal to the terminal station when a different signal is received. CONSTITUTION:Corresponding to a terminal station 3N in a single radio system municipality group, a signal device 12N is provided in a control station. This device 12N consists of a signal device 12N1 for a normal wave route and a signal device 12N1 for a stand-by wave route, and the devices 12N1 and 12N2 are provided with signal detection parts 121 and 124 which detect a signal from the terminal station 3N, registered station collation parts 122 and 125 which collate frequencies, and signal transmission parts 123 and 126 which send collation results to a single ratio repeating station 21. Further, the terminal station 3N is provided with a channel switching part 37 which changes channels of a transmitter 34 and receiver 35, a signal detection part 36 which detects the switching signal from the receiver 35, etc. Then, when a different signal is received, the control station sends the switching signal to change two channels over to each terminal station 3N. |
