Talk:Timeline of radio
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- 1864: James Clerk Maxwell mathematically predicts the existence of radio waves.
- 1872: Mahlon Loomis and W. H. Ward (USA) file for U.S. Patents for a "wireless telegraph".
- 1885 - 1886: Heinrich Hertz proves the existence of radio waves using a primitive transmitter and receiver.
- As a professor of physics at Karlsruhe Polytechnic, he produces electromagnetic waves in the laboratory and measures their wavelength and velocity. He shows that the nature of their reflection and refraction was the same as those of light, confirming that light waves are electromagnetic radiation obeying the Maxwell equations.
- 1887: Hertz publishes his research in the journal Annalen der Physik.
- 1890: Edouard Branly invents the coherer.
- 1891: Nikola Tesla is granted U.S. Patent No. 454,622 "System of Electric Lighting," first revealing the basic techniques for greatly improving radio transmitter performance.
- 1892: Hertz publishes "Untersuchungen Ueber Die Ausbreitung Der Elektrischen Kraft” (“Investigations on the Propagation of Electrical Energy”).
- 1893: Tesla demonstrates "wireless telegraphy" at the Franklin Institute in Philadelphia and the National Electric Light Association, demonstrating the practical application eight years after Hertz experiments.
- 1894: The book INVENTIONS, RESEARCHES AND WRITINGS OF NIKOLA TESLA, edited by T.C. Martin is published.
- 1894: Hertz dies at age 37.
- 1894: Alexander Popov builds his first radio receiver in Russia. This was the first non-laboratory radio service.
- 1894: Oliver Lodge transmits radio signals at a meeting of the British Association for the Advancement of Science at Oxford University on August 14. One year before Marconi but one year after Tesla.
- 1894: Jagadish Chandra Bose uses electromagnetic waves to ignite gunpowder and ring a bell at a distance in November in Calcutta.
- 1895: Popov presents his radio receiver to the Russian Physical and Chemical Society on May 7. The paper on his findings was published December 15.
- 1895: Marconi transmits wireless signals a distance of about one mile.
- 1896: Tesla transmits wireless signals over distances of up to 30 miles.
- 1897: Tesla is granted U.S. Patents No. 645,576 and 649,621 covering the four-tuned circuit wireless system.
- 1897: Marconi is granted a British patent for his work, establishes the world's first radio station on the Isle of Wight, England & forms the London company later to become the Marconi Wireless Telegraph Company
- 1897: Bose reports on his microwave radio experiments to the Royal Institute in London & speculates on the existence of electromagnetic radiation from the sun,
- 1898: Popov effects ship-to-shore communication over a distance of 6 miles
- 1898: Tesla publicly demonstrates his remote-controlled boat containing "rotating coherers" plus circuit elements that allowed secure communication between transmitter and receiver.
- 1900: Popov supervises the construction of a radio station on Hogland island providing a two-way communication by wireless telegraphy between Russian navy base and crew of the battleship General-Admiral Apraksin.
- 1900: Tesla begins construction of the Wardenclyffe Tower facility for trans-Atlantic wireless telephony.
- 1901: Marconi receives the first trans-Atlantic radio signal on 12 December. The message received was three dots, the Morse code for the letter S.
- 1902: Tesla gives interference testimony in the matter of his patent application for "Systems of Signaling" and that of Reginald Fessenden for "Improvement in the Transmission and Receipt of Signals," subsequently determined in Tesla's favor.
- 1904: Bose receives patent for the use of a semi-conducting crystal as a detector of radio waves
- 1904: John Ambrose Fleming develops the "oscillation valve" or "kenotron," later known as the vacuum-tube diode.
- 1904: Tesla advertises his services.
- 1906: Lee De Forest invents the Audion, now known as the vacuum-tube triode.
- 1906: Fessenden transmits the first audio radio broadcast on AM from Brant Rock, Massachusetts. Ships at sea heard a broadcast that included Fessenden playing the song Silent Night on the violin and reading a passage from the Bible.
- 1909: Marconi wins the Nobel Prize in physics
- 1910: Lee de Forest airs radio programs from New York's Metropolitan Opera House.
- 1920s: Hundreds of radio stations emerge in the USA
- 1922: The BBC begins broadcasting from London, on November 14.
- 1928: Julius Edgar Lilienfeld patents the transistor principle in Germany
- 1933: Edwin Armstrong patents FM (frequency modulation)
- 1947: William Shockley, John Bardeen and Walter Brattain succeeds in building the first practical point-contact transistor at Bell Labs on 22 December. This work followed from their war-time research into radar.
- 1956: Shockley, Bardeen and Brattain receive the Nobel Prize in Physics for the invention of the transistor.
J. D. Redding 18:37, 25 March 2007 (UTC)
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