| 摘要 |
PROBLEM TO BE SOLVED: To reduce a restoration time on the occurrence of a communication fault by monitoring the intermodulation distortion of an antenna system and transmitting the monitored information to a central monitor center in a base station radio device such as a portable telephone set system. SOLUTION: An antenna intermodulation distortion monitor section 6 extracts and monitors a low degree high level distortion wave brought into a transmission band from a reflected distortion wave of the intermodulation distortion of a transmission signal caused by the abnormality of an antenna system 1 from a coupler and a distortion wave of a high degree low level brought into a reception band from an output side of a reception amplifier 5 and generates an alarm signal when the distortion wave exceeds a reference level. Furthermore, the distortion wave level for a monitor is outputted to the outside as a digital signal. Moreover, the reference level is varied with an external control signal. |
