A SHORT HISTORY OF DATA RADIO IN THE BEGINNING In 1899, four years after Marconi s first wireless telegraph, the British Navy converted to data The Czar s Navy quickly followed. By 1905 the Japanese had mastered the key techniques and began to intercept messages from the Russian Vladivostok fleet cruising secretly south of Tokyo Bay. Japan s victorious Battle of Tsushima followed. Driven by continued military demands, wireless data technology leaped forward. In 1914 the hapless Russians lost the Battle of Tannenburg because of German intercepts of their land-based data radio communications and in 1917 the British successfully. | The Wireless Data Haadbaak Fourth Edition. James F. DeRose Copyright 1999 John Wiley Sons Inc. ISBNs 0-471-31651-2 Hardback 0-471-22458-8 Electronic L GETTING STARTED The Wireless Data Haadbaak Fourth Edition. James F. DeRose Copyright 1999 John Wiley Sons Inc. ISBNs 0-471-31651-2 Hardback 0-471-22458-8 Electronic 1 A SHORT HISTORY OF DATA RADIO INTHEBEGINNING In 1899 four years after Marconi s first wireless telegraph the British Navy converted to data The Czar s Navy quickly followed. By 1905 the Japanese had mastered the key techniques and began to intercept messages from the Russian Vladivostok fleet cruising secretly south of Tokyo Bay. Japan s victorious Battle of Tsushima followed. Driven by continued military demands wireless data technology leaped forward. In 1914 the hapless Russians lost the Battle of Tannenburg because of German intercepts of their land-based data radio communications and in 1917 the British successfully employed radio telegraph in tanks at the Battle of Cambrai2 by 1918 these same units were adapted for aircraft. In World War II both the United States and Germany communicated with and controlled their widely scattered submarine fleets via data radio. During this period H. C. A. Van Duuren3 devised the technique still known as ARQ Automatic Repeat reQuest one of those disarmingly simple ideas that seems so trivial in retrospect. The idea was to ensure that a block of characters had been successfully transmitted through the use of error detection. A detected error was followed by a signal from the receiver asking the transmitter to repeat the block. In the late 1950s wireless teletype units such as the CY2977LG were in use in high-profile applications like the media pool aboard Air Force One. The Semi-Automatic Ground Environment SAGE air defense system began testing digitized radar information sent by data radio from airborne early warning aircraft. The more complex messages were separated from the continuously repeating X .
