9/13/2023 0 Comments Edwin howard armstrong![]() ![]() ![]() Armstrong first applied for patent in France in December 1918 and for United States patent in February 1919. The first model was not ready until November. With war work taking precedence and his fellow officers tied up in other pressing projects, his work was delayed. Armstrong needed assistance to stage these experiments and create the necessary apparatus. ![]() Buckley, 1918 May-June, page 3įollowing Armstrong’s proposed methodology to Major Buckley, experiments would need to be conducted. Method of Reception, Disclosed to Major O.E. He worked out the necessary experiments needed to prove his forthcoming invention, writing down the proposed method in June 1918 with Major Buckley signing off as witness (proposal seen here in 3 pages). He had thus sorted out how to use the heterodyne principle to bring short-wave frequencies down to the range of his long-wave amplifier. The bombing raid and third link, to which Armstrong refers above, occurred in Paris, March 1918. This, I think is the only completely synthetic invention I have ever made." 1 Not one link in the chain could have been dispensed with. All three links of the chain suddenly joined up and the superheterodyne method of amplification was practically forced into existence. The unique nature of the problem, involving the amplification of waves shorter than any ever contemplated and quite insoluble by any conventional means of reception, demanded a radical solution. Thinking of some way of improving the methods of locating the position of airplanes, I conceived the idea that perhaps very short waves sent out from them by the motor ignition systems might be used. I may say that night bombing was not very dangerous in those days, either for the man on the ground or the man in the airplane. "The third link came months later as I happened to be watching a night bombing raid and wondered at the ineffectiveness of the antiaircraft fire. As the Major recounts some years later upon receiving the Edison Medal in 1943: This meeting with Round pushed him further and he continued to examine the problem of receiving weak high frequency signals. Armstrong’s attention was captured as this was a problem that required further research.Īrmstrong had studied heterodyne circuitry for quite a while and understood it well. These tubes were not, and would never be, available to the French and the Americans, as these tubes were not appropriate for the task. Round had created these amplifiers by designing his own vacuum tube (V24). It was here that Armstrong was introduced to Round’s short-wave equipment. Round was an engineer with Marconi who, at the time, was in charge of the Admiralty’s wireless direction-finding stations. EHA letter to Mother, 1917 October 28, first 2 pagesĮHA letter to Mother, 1917 October 28, last 2 pages The letter seen here (below), dated 1917 October 28, from Armstrong to his mother, details his visit and recounts his introduction with Henry Joseph Round. While there, he ventured to London, stopping by the Marconi offices. The Major set off to France but en route he was delayed in England due to heavy fog. This Division had been created in order to examine any existing equipment manufactured by the Europeans for the American Expeditionary Forces. In 1917 he was posted to France, placed in charge of the Radio Group of the Research Section of the Division of Research and Inspection. When the United States entered World War I, Armstrong enlisted in the Signal Corps. ![]()
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