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radio technologies to transmit sound (AM). In this device the rotor had 600 poles, rotated at 2170 RPM and the output frequency was 22.1 kHz. The stator was water-cooled. Alexanderson alternators were very expensive, inefficient, and finicky to adjust, and were replaced by
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used between 1906 and the mid 1920s, mostly at powerful governmental and Naval radio stations. It consisted of a specialized electric generator spun at extremely high speed to generate radio waves, and was one of the first
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Alexanderson 200-kw alternator radio transmitter installed at the US Navy's New
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E. F. W. Alexanderson, Chief
Engineer, Radio Corporation of America
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