However, arc transmitters were significantly inferior to the then state-of-the-art Alexanderson alternator and the arc transmitters were replaced by more modern vacuum tube transmitters in 1931.
12.
However, arc transmitters were significantly inferior to the then state-of-the-art Alexanderson alternator and the arc transmitters were replaced by more modern vacuum tube transmitters in 1931.
13.
In the fall of 1915, he began teaching a radio principles class at the local Y . M . C . A . Tuska also began experimenting with radiotelephony, using an arc transmitter of his own design which employed tungsten electrodes to make audio transmissions.
14.
In 1916, operating under a personal Special Amateur license, 1ZT, Tuska began experimenting with radiotelephony, using an arc transmitter of his own design which employed tungsten electrodes to make audio transmissions, and by March of that year was broadcasting semi-regular phonograph concerts.
15.
The "'arc converter "', sometimes called the "'arc transmitter "', or "'Poulsen arc "'after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of continuous sinusoidal waves, it was one of the first technologies used to transmit sound ( amplitude modulation ) by radio.
16.
From 1913 to 1919 he led development and manufacture of very large Poulsen arc transmitters ( ranging in sizes from 200, 350, 500 and up to 1, 000 kilowatts ) for the Army and Navy, which were then installed in stations for trans-oceanic communications in the United States, France, Panama, Hawaii, and across the Pacific to the Philippines.
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