Abstract: The present invention relates to an apparatus and method used to measure and identify sources of communications interference. In one embodiment a test instrument includes multiple receivers designed for reception of radiated radio signals in free space. The resulting measured signals are processed to determine if there is a mathematical and/or timing relationship between the parent transmitter(s) suspected of causing the interference, and the actual measured interference in the spectrum being evaluated, and providing a ranked list of possible interferers.

Abstract: The present invention relates to a measurement method for characterizing passive intermodulation in radio frequency (RF) communication systems. The method is particularly well suited for characterizing the passive intermodulation level of fielded RF subsystems and components where AC line power may not be readily available. The method utilizes a minimum level of RF energy to perform the characterization, minimizing the disruption to nearby communication systems. By utilizing low average RF power levels, a device which utilizes this method can be designed for battery operation and hand-held use. This makes the device significantly less costly than currently available measurement solutions.