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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク History of amateur radio ： ウィキペディア英語版 History of amateur radio Throughout the history of amateur radio, amateur radio enthusiasts have made significant contributions to science, engineering, industry, and social services. Research by amateur radio operators has founded new industries,〔http://www.bliley.net/XTAL/Industry-Hams.html ''THE INFLUENCE OF AMATEUR RADIO ON THE DEVELOPMENT OF THE COMMERCIAL MARKET FOR QUARTZ PIEZOELECTRIC RESONATORS IN THE UNITED STATES.'' By Patrick R. J. Brown, Hewlett Packard Company, Spokane Division〕 built economies,〔people.smu.edu/arc/ ''Inventor of IC "chip", Nobel Prize Winner Jack S. Kilby Credits Amateur Radio for His Start in Electronics.''〕 empowered nations,〔http://www.ari.vt.edu/internet/Impression/ICT.pdf ''Role of Amateur Radio in Development Communication of Bangladesh.'' Information & Communication Technology for Development. By Bazlur Rahman〕 and saved lives〔http://www.arrl.org/news/stories/2004/12/29/100/?nc=1 ''Amateur Radio "Saved Lives" in South Asia'' ARRL.org〕 in times of emergency. Amateur radio is a hobby and, by law, completely non-commercial. Individual amateur "ham" radio operators pursue the avocation for personal pleasure through building their own radio stations and communicating with their fellows globally, and for self-improvement via study and practice of electronics, computers, and radio and TV wave behavior. Radio amateurs are, thus, "amateurs" in the true sense of the word: pursuit of an activity only for the love of it. Radio amateurs can not broadcast or transmit music and other general public entertainment programming. The amateur radio use of the air waves is for personal satisfaction and for forwarding the "state of the art" of electronics and communication techniques. Amateur radio operations can be detected in designated bands throughout the radio spectrum, using a variety of modulation methods including Morse code, voice and digital modes, and image modes such as television and facsimile. ==Beginnings== Amateur radio came into being after radio waves (proved to exist by Heinrich Rudolf Hertz in 1888) were adapted into a communication system in the 1890s by the Italian inventor Guglielmo Marconi. In the late 19th century there had been amateur ''wired'' telegraphers setting up their own interconnected telegraphic systems. Following Marconi's success many people began experimenting with this new form of "wireless telegraphy". Information on "Hertzian wave" based wireless telegraphy systems (the name "radio" would not come into common use until several years later) was sketchy, with magazines such as the November, 1901 issue of ''Amateur Work'' showing how to build a simple system based on Hertz' early experiments.〔(THOMAS H. WHITE , UNITED STATES EARLY RADIO HISTORY, Pioneering Amateurs (1900-1917), EARLY EXPERIMENTERS )〕 Magazines show a continued progress by amateurs including a 1904 story on two Boston, Massachusetts 8th graders constructing a transmitter and receiver with a range of eight miles and a 1906 story about two Rhode Island teenagers building a wireless station in a chicken coop. In the US the first commercially produced wireless telegraphy transmitter / receiver systems became available to experimenters and amateurs in 1905.〔 In 1908, students at Columbia University formed the Wireless Telegraph Club of Columbia University, now the Columbia University Amateur Radio Club. This is the earliest recorded formation of an amateur radio club, collegiate or otherwise.〔"Wireless Club at Columbia" (The Sun. November 25, 1908. Page 2. New York, NY. ) - Obtained from Library of Congress Chronicling America project. The article is visible directly below the conspicuous ad for "Hanan Shoes".〕 In 1910, the Amateurs of Australia formed, now the Wireless Institute of Australia. The rapid expansion and even "mania" for amateur radio, with many thousands of transmitters set up by 1910, led to a wide spread problem of inadvertent and even malicious radio interference with commercial and military radio systems. Some of the problem came from amateurs using crude spark-transmitters that spread signals across a wide part of the radio spectrum.〔 In 1912 after the RMS Titanic sank, the United States Congress passed the Radio Act of 1912〔 which restricted private stations to wavelengths of 200 meters or shorter (1500 kHz or higher). These "short wave" frequencies were generally considered useless at the time, and the number of radio hobbyists in the U.S. is estimated to have dropped by as much as 88%. Other countries followed suit and by 1913 the International Convention for the Safety of Life at Sea was convened and produced a treaty requiring shipboard radio stations to be manned 24 hours a day. The Radio Act of 1912 also marked the beginning of U.S. federal licensing of amateur radio operators and stations. The origin of the term "ham", as a synonym for an amateur radio operator, was a taunt by professional operators.〔(【引用サイトリンク】first=Louise )〕〔(【引用サイトリンク】first=Thierry LX4SKY )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「History of amateur radio」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.