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1923 __ The first successful two-way transatlantic amateur wireless communication between the U.S. and France
Comment : Shortwave broadcasting was still in its infancy. All radio traffic and broadcasting of that time was conducted on wavelengths that were longer than 200 metres, i.e on the medium and long-wave bands of today. The "200 metres and under" or "shortwave" band was allocated to amateur radio enthusiasts for experimental transmissions. Their experiments quickly bore fruit. 1923 saw the first successful transatlantic contact between the U.S. and France on frequencies in the 110m band. Experiments suggested that shorter wavelengths could be even more suitable for long-distance transmissions. Broadcasters soon picked up on this fact, and began using shortwave as well. It was the Dutch firm Phillips which made history. In 1927 the company began broadcasting on shortwave from a transmitter in Eindhoven. In 1928 the station, which used the callsign 'PCJ', began broadcasting a multi-lingual programme called "Happy Station". (Miroslav Krupička)On November 27, 1923, at about 21:30 UTC John L. Reinartz, 1XAM and Fred Schnell, 1MO, in USA [at Haverford College] made the first two-way contact with the French Léon Deloy, 8AB [Léon Deloy’s amateur station in Nice, France], on the wavelength specially authorized of 110 meters (2.72 Mc) for this event. In the following months a ten of European and American amateur stations confirmed a transatlantic QSO by means of shortwaves. This time the triumph was complete. Amateurs proofed that the "useless" 200-meter band could carry signals across the ocean, even using amateur and low power equipment. They demonstrated also the superiority of CW over spark, all the signal energy being concentrated in a narrow spectrum, signals could be heard across much greater distances. These events marked the close of the spark era. The good news travelled around the world at the speed of shortwaves. Within a year, amateurs had communicated with most continents : there was QSOs worked between North and South America, South America and New Zealand, North America and New Zealand, and between Europe and New Zealand. The quest for DX stations was born ! In a few years more than 60 countries were active on the air. Like ragchewing between hams at short distance, the DX hunting was entered in habits. In 1926, Brandon Wentworth, 6OI achieved what was considered at that time as the "ultimate DX", work all continents from his base station in California; the first WAC award was born, but not released until 1930. The next year Hiram Percy Maxim, now 1AW and the ARRL organized the first international DX-party, the precursor of international DX contests. (Thierry Lombry, “The History of Amateur Radio”)
Source : “Hams Across the Sea”, In “RADIO BROADCAST”, Vol. IV, NOVEMBER, 1923, to APRIL, 1924, Garden City, N. Y., DOUBLEDAY, PAGE & COMPANY, 1924, pp. 422-423.
Urls : http://www.radio.cz/en/static/history-of-radio-prague/the-first-attempts-at-crossborder-broadcasting (last visited ) http://www.astrosurf.com/luxorion/qsl-ham-history6.htm (last visited ) http://www.archive.org/stream/radiobroadcast04gardrich/%23page/422/mode/2up (last visited )

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