Patent ID: 9225441
Filing Date: 2015-12-29
Classification: G01R,H04B

Abstract:
1. A test module for use in a system for locating faults, said test module including: an input port for receiving one or more test signals; an output port for applying said one or more test signals to a test medium; a monitor port for reception of a plurality of passive intermodulation signals produced by the test medium in response to the test signals; a directional coupler module coupled between the input and output ports; a primary receiver coupled to the directional coupler module for reception of a plurality of primary return signals produced by the test medium in response to the one or more test signals; a reference receiver coupled to the directional coupler module for generating a plurality of reference signals from the one or more test signals; a phase detector module coupled to the primary and reference receivers, said phase detector measuring phase offsets between the plurality of primary return signals and reference signals; a control module coupled to the primary and reference receivers and the phase detector, said control module being adapted to: