| 摘要 |
PURPOSE:To easily discover the place which is being disconnected, without depending on the labor by monitoring an impedance at the time of the transmission output, detecting the mismatching condition and monitoring a branching line disconnection. CONSTITUTION:When a branching line 3 is driven by a branching line driving means 41, the voltage amplitude or the current amplitude in accordance with the impedance of a branching line from a branching line to an impedance matching coupler 1 is obtained. An amplitude monitoring means 42 monitors this, and when the connection abnormality is detected, the effect is transmitted to other communication station by a connection abnormality communicating means 44. Thus, the fact that the branching line 3 to an impedance matching coupler 1 is being disconnected and the discovery of the place can be easily performed without depending on the labor. |
