A magnetron is a vacuum tube of high power, which functions as a self-triggered microwave oscillator. Crossed magnetic fields and electron are used in the magnetron device to generate high-power output which is required in radar equipment. Magnetron is a multi-cavity device which may be used in radar transmitters as either cw or pulsed oscillators operating at frequencies varying from around 600 to 30,000 megahertz. The somewhat simple construction has a shortcoming that a magnetron device can usually work only on a predetermined fixed frequency.
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