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1915 __ Device for Receiving Wireless Time Signals
Lee de Forest (1873-1961)
Comment : De Forest transmits the human voice from Arlington, Virginia, across the Atlantic Ocean to a receiving antenna atop the Eiffel Tower in Paris. (Barry Mishkind, “The Broadcast Archives”, [http://www.oldradio.com/ www.oldradio.com])The plate on the front of the receiver in part reads: DE FOREST AUDION TIME RECEIVER. SET FOR U.S. TIME SIGNALS FROM ARLINGTON, VA. The Navy's high-power station, NAA in Arlington, Virginia, had begun operation a couple years earlier, and was best known for broadcasting daily time signals. Because the station was not capable of transmitting full audio, the correct time was signaled by a series of preliminary dots, followed by a dash at the top of the hour. Based on the description, this receiver used a simple regenerative circuit -- called an "ultra audion" in DeForest parlance -- permanently tuned to NAA's operating wavelength of 2,500 meters (120 kilohertz). (Electrical World, March 27, 1915, pages 518-519 Thomas H. White, “Articles and extracts about early radio and related technologies, concentrating on the United States in the period from 1897 to 1927”)It transmitted a voice from the Naval station at Arlington, Virginia with its 450- and 600-foot high antenna towers, to Honolulu on September 29, 1915. (George P. Oslin)
French comment : 25 octobre 1915 : Réception à la Tour Eiffel d'un message d'Arlington (Virginie - USA) : distance 6 800 km. C'est la voix de l'Américain Alexanderson qui traverse pour la première fois l'océan Atlantique au nom de la marine américaine. La réception sera néanmoins très médiocre. l'émetteur avait une puissance de 3 kW. (Jean-Marc Printz)
Urls : http://www.oldradio.com/ (last visited ) http://earlyradiohistory.us/1915tim.htm (last visited )

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