| 摘要 |
PURPOSE:To enable to discover the failure at the time other than the maintenance and inspection of receivers and periodical inspection, by monitoring the conditions of the receiver at normal waiting time of the receiver performing radio communication, and displaying the noramlity in the receiver after judgement or informing it to outside the receiver. CONSTITUTION:In the receiver performing radio communication with the transmitter emitting electromagnetic waves only at communication, the oscillation circuit 12 oscillating the signal having the frequency corresponding to the reception frequency of the receiver is connected to the mixing circuit 11, and the oscillation circuit 12 is controlled with the control circuit 13 inputting the signal at an arbitrary time when the receiver at the control input terminal 16 is in waiting condition. Further, the electromagnetic wave detection circuit 9 detecting the output of the frequency discrimination circuit 6 receiving from the oscillation circuit 12 is provided, and the comparison circuit 14 comparing the output of the detection circuit 9 with the control signal fed to the terminal 16 is provided, allowing the output of the comparison circuit 14 to monitor the receiver in waiting condition normally. |
