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Encyclopedia > Alexanderson Day

The Alexanderson Day (named after the inventor Ernst Fredrik Werner Alexanderson) is the great day of the open oor at the VLF transmitter Grimeton. On Alexanderson Day the only workable machine transmitter in the world is used to transmit short morse messages on 17.2 kHz, which should be easily receivable in whole Europe. A modern and very convenient way for their reception is a PC with a coil of its soundcard entrance using a FFT-analysis software.

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Alexanderson alternator - Wikipedia, the free encyclopedia (571 words)
The Alexanderson alternator followed Fessenden's rotary spark-gap transmitter as the second radio transmitter to be modulated to carry the sound of the human voice.
Until the invention of vacuum tube (thermionic valve) oscillators in the 1920's, the Alexanderson alternator was an important high-power radio transmitter, and allowed amplitude modulation radio transmission of the human voice.
The last remaining workable Alexanderson alternator is at the VLF transmitter Grimeton in Sweden.
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