Transatlantic Crossing - Transatlantic Radio

Transatlantic radio communication was first accomplished on December 12, 1901 by Guglielmo Marconi who, using a temporary receiving station at Signal Hill, Newfoundland, received a Morse code signal representing the letter "S" sent from Poldhu, in Cornwall, United Kingdom. Guglielmo Marconi initiated commercial transatlantic radio communications between his high power long wave wireless telegraphy stations in Clifden Ireland and Glace Bay, Nova Scotia on 17 October 1907.

Amateur radio operators are usually credited with the discovery of transatlantic radio communication in the shortwave bands. The first successful transatlantic tests were conducted by radio amateurs in December 1921 operating in the 200 meter mediumwave band, the shortest wavelength then available to amateurs. In 1922 hundreds of North American amateurs were heard in Europe at 200 meters and at least 20 North American amateurs heard amateur signals from Europe. The first two way transatlantic shortwave radio contacts were completed by radio amateurs in November 1923, on 110 meters.

Marconi initiated the first commercial shortwave transatlantic radio communication between the UK to Canada using his Beam Wireless Service which went into commercial operation on 25 October 1926. Shortwave radio vastly increased the speed and capacity of transatlantic communications at dramatically reduced cost compared to telegraph cable and long wave radio.

Telstar was the first communications satellite to provide commercial transatlantic communications. It was launched by on July 10, 1962, the first privately sponsored space launch. Communications satellites vastly increased the speed and quality of transatlantic communication, but transatlantic fiber optic cables have carried the vast majority of transatlantic communications traffic since the early 1990s.