Search results
Results from the WOW.Com Content Network
The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion in 1906. During the mid-1920s, amplifying vacuum tubes revolutionized radio receivers and transmitters. John Ambrose Fleming developed a vacuum tube diode. Lee de Forest placed a screen, added a "grid" electrode, creating the triode.
23 November 1923: 2SB was the first Australian station to be officially recognised. 16 November 1924: first regular broadcast of Ukrainian Radio. December 1924: starting of regular broadcast in Russia. 23 May 1925: First broadcast in Tbilisi, Georgia. 1 November 1925: First broadcast in Riga, Latvia. 1 December 1925: First broadcast in Budapest ...
Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]
Milestones in radio: the first half century (1895–1945). The UNESCO courier (February 1997), p. 16–21; Radio Review/Radio Listeners Guide (1925–1929), Broadcasting Yearbook (1935–2010), World Radio TV Handbook (1947–) Berg, Jerome S. The early shortwave stations: a broadcasting history through 1945 (2013) radioheritage.net
Dorman D. Israel, a young radio engineer from the University of Cincinnati, designed and built the station's first two radio transmitters (at 100 and 1,000 watts). [19] [20] The Crosley Corporation claimed that in 1928 WLW became the first 50-kilowatt commercial station in the United States with a regular broadcasting schedule. In 1934 Crosley ...
Thirty-five years ago, users heard the infamous dial-up sound for the first time. The '80s were a decade defined by major technological innovations, big hair, cult-classic movies and the start of ...
1922: J. McWilliams Stone invents the first portable radio receiver. George Frost builds the first "car radio" in his Ford Model T. 1923 The 15-year-old Manfred von Ardenne is granted his first patent for an electron tube having a plurality of electrodes. Siegmund Loewe (1885–1962) builds with the tube his first radio receiver "Loewe Opta-".
In 1983, KDAY-AM became the first radio station to play wall-to-wall rap music, thanks to an ambitious new music director and some soon-to-be famous DJs.