The Alexanderson alternator produced " purer " continuous waves than the arc converter, whose nonsinusoidal output generated significant harmonics, so the alternator was preferred for long-distance telegraphy.
12.
Some early CW transmitters employed an arc converter that could not be conveniently Spark transmitters used for this method consumed a lot of bandwidth and caused interference, so it was discouraged by 1921.
13.
In 1992 the mercury arc converters at Condrongianos and San Dalmazio were decommissioned and two new converters stations built, using air-cooled, air-insulated thyristor valves similar to those supplied for the connection at Lucciana.
14.
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.
