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Paraphrasing the Wikipedia entry for the magnetron, we learn that, ... a stream of electrons passes by the openings to metal cavity resonators and causes microwaves to oscillate within, similar to the way a whistle produces a tone when excited by an air stream blown past its opening. The resonant frequency is determined by the cavities' physical dimensions. ...


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I once wondered if a microwave oven magnetron might make a good transmitter, for CW for EME. I took a spectrum analyser and antenna to the kitchen and microwaved a glass of water, and I saw... The most awful collection of strong tones, covering a large part of 2.4 to 2.5 GHz, all of them shifting up and down in frequency, rising and falling, as the water ...


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I'm sorry if this answer doesn't answer your literal questions – it's just that these questions aren't strictly answerable. it is commonly known that electromagnetic radiation from an antenna is polarized; the electric field is parallel to the rod and the magnetic component is perpendicular to it. It is commonly known that antennas come in more shapes than ...


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