Alexanderson alternator
An Alexanderson alternator is a rotating machine for the generation of high frequency up 100 kHz. You can see the only workable Alexanderson alternator at the VLF transmitter Grimeton. The alternator was invented by Ernst Alexanderson. Until the invention of vacuum tube (thermionic valve) oscillators in the 1920's, the Alexanderson alternator was an important high-power radio transmitter, and the first device that allowed amplitude modulation radio transmission of the human voice.
Related Topics:
VLF transmitter Grimeton - Ernst Alexanderson - Vacuum tube - Oscillator - 1920 - Radio - Transmitter - Amplitude modulation
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