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1901 Marconi bridges the Atlantic, a feat which caught the world's attention and fueled the imagination of thousands of potential amateurs, who took their first steps into wireless. His transatlantic triumph came on the 12th December 1901 when the morse letter 'S' was transmitted from Poldhu, in Cornwall and received by Marconi himself at St. John's, Newfoundland, who recorded the historic event in his pocket book simply "Sigs at 12.20, 1.10 & 2.20".

Marconi's original transmitters used high voltage spark gaps to generate 'Hertzian Waves'. The first experimental sets used induction coils with vibrating contact current interrupters to generate the high voltages.

In the way of development after Marconi's high voltage spark gap came the use of high voltage transformers to generate the spark gap voltage. The ultimate came in the powerful transmitters such as those at the U.S. Navy's station at Arlington, Virginia. Here a 500 Hz generator, a step up transformer, and a rotary spark gap was used used to create the high voltage. Some of these produced a deafening noise created by the spark. Spark transmitters were often placed in acoustically insulated rooms to deaden the sound.