Abstract
The first step in solving an electromagnetic interference (EMI) problem is to locate the source. Noise can be emitted from any of a wide variety of sources. This chapter examines some approaches to finding the sources, including both simple sleuthing tools and more formal radio direction finding (RDF) methods. The correct tool for finding RF sources is anything that permits to unambiguously determine where the radiation is coming from. The standard medium-wave and shortwave loop antenna, used by a lot of radio enthusiasm, is also useful for finding RF emitting sources. Radio direction finding (RDF) is the art of locating a radio station or RF noise emitter by using a directional radio antenna and receiver. Regular wire loop antennas are also used for radio direction finding. Switching is accomplished by using a bipolar square wave and PIN diodes. One of the uses of this type of system is that it can be fitted to a VHF scanner receiver for portable RDF efforts at locating EMI emitters.
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