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Many power-system-related effects and sources of man-made noise cause impulsive interference. Due to its wideband nature, this type of interference is difficult to remove by filtering. This paper presents a system that is capable of locating and characterizing sources of impulsive interference. It is based on three separate asynchronous receiving units. The operating principle of the location system is outlined, and a prototype practical implementation is described. The location accuracies achieved both in the laboratory and in practical field trials are reported.