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1976 Viking 1 radio signal from Mars help prove general theory of relativity
1966 Radio time signal WWV moves from Greenbelt, Md to Boulder, Colorado 1966 Radio time signal WWV moves from Greenbelt, Maryland 1962 MIT sends TV signal by satellite for 1st time: CA to MA 1959 Farthest radio signal heard (Pioneer IV, 400,000 miles) 1958 1st test project of Signal Communications by Orbiting Relay Equip 1951 Leidse astronomers discover radio signal out of Milky Way system 1941 Passenger ship Lurline sends radio signal of sighting Japanese war fleet 1941 British signal officer Bill Hudson lands in Montenegro 1940 FCC hears 1st transmission of FM radio with clear, static-free signal 1933 Karl Jansky reports reception of cosmic radio signal in Washington D.C. 1923 Garrett Morgan invents and patents traffic signal 1914 U.S. Army air service 1st comes into being, in Signal Corps 1907 For 1st time a ball drops at Times Square to signal new year 1907 Signal Corps of U.S. Army starts aircraft division 1906 SOS adopted as warning signal by 1st conference on wireless telegraphy 1904 Marconi Co establishes "CQD" as 1st International radio distress signal 1901 Marconi receives 1st transatlantic radio signal, England to US 1901 Marconi sends 1st transatlantic radio signal, Cornwall to Nfld 1890 1st signal box for San Francisco Police Department goes into operation 1885 General Wolseley receives last distress signal of General Gordon in Khartoum |
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