| 摘要 |
PROBLEM TO BE SOLVED: To maintain a speech between a mobile station and a stationary station radio equipment even when any of the stationary station radio equipments is out of order due to a fault or the like by connecting another channel from a repeater to a controller. SOLUTION: A stationary station radio equipment 4 and a base station radio equipment 2 detect a squelch voltage respectively by the transmission from the radio equipment 4 or the mobile station 1. Through the detection of the squelch voltage, the radio equipment 4 excites the transmission of a radio equipment 2 via a repeater 3 and on the contrary, when the radio equipment 2 detects the squelch voltage, the transmission of the radio equipment 4 is started via the repeater 3. The reception signal is sent as it is in the repeater 3 to an opposite party station. Then a changeover device 6 is provided to a pre-stage of a controller 7 and an interface circuit connecting to the controller 7 via a wired line is provided to the repeater 3. Thus, in the case that a fault takes place in the stationary station radio equipments 4, 5 and they are out of order, the changeover device 6 is thrown to the position of the wired line so as to ensure a speech between both the stations 1, 7. |
