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Several transmitters and receivers for periodic nonsinusoidal electromagnetic waves have been built during the last few years. Various applications of such waves, primarily in radar, have been recognized. The first practical equipment, an into-the-ground radar for construction surveying, has become commercially available. The efficient radiation of nonsinusoidal periodic waves has been discussed in the literature, but very little has been published on their selective reception. This paper describes the principle of selective receivers for periodic waves with general time variation, in analogy to the design of the usual receivers for waves with sinusoidal time variation.