Cellular repeater system to monitor pim and there of pim monitor method

A PIM signal monitoring system for a mobile communication repeater and a method thereof are provided to form a PIM signal controller in the mobile communication repeater and properly deal with a PIM signal through continuous monitoring, thereby properly dealing with deterioration of receiving performance of a mobile communication system and generation of abnormality. A distributor(110) is disposed in a front end of a variable attenuator and distributes a signal transmitted from a repeater into a signal of a fixed gain. An amplifier(120) receives and amplifies the signal distributed by the distributor, and a signal detector(130) detects the signal amplified by the amplifier. A PIM(Passive Inter-Modulation) signal controller(140) determines whether a PIM signal is generated after receiving the signal detected by the signal detector.