| 摘要 |
PURPOSE:To exactly rouse the abnormality of a radio calling system to a preserver, and to erase a noise due to a pager for monitor at the normal time. CONSTITUTION:A frequency calling part 31 provided at a radio calling switchboard 3, calls a pager 7 for monitor in a preliminarily set frequency. A detecting part 71 to be called of the pager 7 for monitor judges that the system is normally worked, at the time of detecting the reception of this frequently transmitted calling number within a preliminarily set time by referring to a timer part 72. And also, the detecting part 71 to be called rings the pager 7 for monitor by an alarming part 73, when the reception of the calling signal is not detected within this set time. |
