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A magnetron oscillator for wavelengths from 6 to 17 centimeters (5000 down to 1700 megacycles) has been designed and developed for use either in the research laboratory or for instruction. It consists of a split-anode magnetron inserted between the pole pieces of a magnet whose housing serves to couple the magnetron oscillating circuit to transmission systems of various types. Two methods for producing and controlling the magnetic field have been applied, a permanent-magnet system for the longer wavelengths, and a more powerful electromagnet for the shorter waves. A turntable supported on a stand allows either type of oscillator with its magnet to swing in a horizontal plane. By mounting the oscillator in two distinct positions, either upright, or on its side, the radiating beam may be swept either in the plane of polarization or perpendicular to it.