{{위키데이터 속성 추적}}
{{출처 필요|날짜=2010-4-22}}


'''무선전신기'''({{llang|en|wireless telegraph}})란 [[마르코니]]가 1896년 발명한 배와 비행기의 [[전신통신]]을 할 때 이용된 통신기이다.

== 무선전신기의 원리 ==
무선전신기는 [[송신기]]에서 보낸 전파를 [[수신기]]에서 받아들여 통신하는 것이다. 그런데 [[파동]]은 어떤 시스템에서 다른 시스템으로 전달될 때 특정한 주파수(전파나 음파가 1초 동안에 진동하는 횟수)에서만 잘 전달된다. 이를 '공명' 현상이라고 한다. 즉 양쪽 시스템의 고유한 [[공명 진동수]]가 같을 때 [[전파]]가 잘 전달되는 것이다. 무선전신기의 예를 생각해보면 A가 10, 20, 30Hz([[헤르츠]])의 주파수를 발생시킬 수 있는 송신기를 가지고 있고, B는 10, 30, 40Hz, C는 5, 15, 30Hz를 받아들일 수 있는 수신기를 가지고 있다고 하자. A가 10Hz의 전파에 자신의 음성을 실어 보내면 B와 C는 주파수를 10Hz에 맞추어야만 공명에 의해 전파를 수신할 수 있다. 하지만 C는 10Hz에 맞출 수 없으므로 A의 신호를 수신할 수 없다. 만약 A가 30Hz의 신호를 보내면 B와 C 둘 다 수신이 가능해 진다. 이를 통해 암호나 정보를 통신했다.

=== 라디오 수신과의 관계 ===
라디오 수신도 똑같은 원리다. 방송국에서 특정한 주파수에 음악 등을 실어 보내면 우리는 라디오 수신기로 그 주파수에 맞추어 신호를 받아들이는 것이다. 예를 들어 KBS는 89.1MHz, MBC는 91.9MHz로 방송을 내보내는데, 라디오주파수를 89.1MHz에 맞추면 공명현상에 의해 KBS만 들리고 MBC에서 내보낸 신호는 라디오에 들어오지 않는 것이다.

== 무선전신기의 이용 ==
무선통신은 통신 역사의 혁명을 가져왔다. 무선으로 통신이 가능해져 배와 비행기와의 서로간의 통신이 가능해지며, 멀리 떨어져 있는 곳도 케이블 없이 통신이 가능해지게 된다.

== 같이 보기 ==
* [[라디오 수신]]
* [[마르코니]]

== 추가 자료 ==
* Sarkar, T. K., & Baker, D. C. (2006). [http://books.google.com/books?id=49jgQvbrvCUC History of wireless]. Hoboken, NJ: Wiley-Interscience.
* Hugh G. J. Aitken, ''Syntony and Spark: the Origins of Radio'', {{ISBN|0-471-01816-3}}. 1976.
* Elliot N. Sivowitch, ''A Technological Survey of Broadcasting’s Pre-History,'' Journal of Broadcasting, 15:1-20 (Winter 1970-71).
* Colby, F. M., Williams, T., & Wade, H. T. (1930). "[http://books.google.com/books?id=tnNXAAAAMAAJ&pg=PA636&vq=637&source=gbs_search_r&cad=1_1#PPA637,M1 Wireless Telegraphy]", [http://books.google.com/books?id=tnNXAAAAMAAJ The New international encyclopaedia]. New York: Dodd, Mead and Co.
* "[http://books.google.com/books?id=uDQEAAAAYAAJ&pg=PA529&lr=&as_brr=1&ei=sdmhSKe4JaOujgGM7Jn7BA#PPA529,M1 Wireless telegraphy]", [http://books.google.com/books?id=UoxAwrVzc88C The Encyclopaedia Britannica]. (1922). London: Encyclopædia Britannica.
* Stanley, R. (1919). [http://books.google.com/books?id=4hdDAAAAIAAJ Text-book on wireless telegraphy]. London: Longmans, Green
* Miessner, B. F. (1916). [http://books.google.com/books?id=6ExrAAAAMAAJ Radiodynamics: The wireless control of torpedoes and other mechanisms]. New York: D. Van Nostrand Co
* Thompson, S. P. (1915). [http://books.google.com/books?id=hLk3AAAAMAAJ Elementary lessons in electricity and magnetism]. New York: Macmillan.
* Stanley, R. (1914). [http://books.google.com/books?id=OhdDAAAAIAAJ Text book on wireless telegraphy]. London: Longmans, Green.
* Ashley, C. G., & Hayward, C. B. (1912). [http://books.google.com/books?id=pK-EAAAAIAAJ Wireless telegraphy and wireless telephony]: an understandable presentation of the science of wireless transmission of intelligence. Chicago: American School of Correspondence.
* Massie, W. W., & Underhill, C. R. (1911). [http://books.google.com/books?id=6_RUAAAAMAAJ Wireless telegraphy and telephony popularly explained]. New York: D. Van Nostrand.
* Captain S.S. Robison(1911). [http://books.google.com/books?id=n27mAAAAMAAJ&pg=PA278 Developments in Wireless Telegraphy]. International marine engineering, Volume 16. Simmons-Boardman Pub. Co.
* Bottone, S. R. (1910). [http://books.google.com/books?id=yS5IAAAAIAAJ Wireless telegraphy and Hertzian waves]. London: Whittaker & Co.
* Erskine-Murray, J. (1909). [http://books.google.com/books?id=CgxVAAAAMAAJ A handbook of wireless telegraphy: its theory and practice, for the use of electrical engineers, students, and operators]. New York: Van Nostrand.
* Twining, H. L. V., & Dubilier, W. (1909). [http://books.google.com/books?id=0eYEAAAAMAAJ Wireless telegraphy and high frequency electricity; a manual containing detailed information for the construction of transformers, wireless telegraph and high frequency apparatus, with chapters on their theory and operation]. Los Angeles, Cal: The author.
* [http://www.gutenberg.org/files/15207/15207-8.txt ''The New Physics and Its Evolution''. Chapter VII: A Chapter in the History of Science: Wireless telegraphy] by Lucien Poincaré, eBook #15207, released February 28, 2005. [originally, published: New York, D. Appleton and Company. 1909].
* Fleming, J. A. (1908). [http://books.google.com/books?id=ZSdDAAAAIAAJ The principles of electric wave telegraphy]. London: New York and Co.
* Simmons, H. H. (1908). "[http://books.google.com/books?id=MV9LAAAAMAAJ&pg=PA851&lr=&as_brr=1&ei=iNihSJDlLZzsiQGi1uAN#PPA851,M1 Wireless telegraphy]", [http://books.google.com/books?id=MV9LAAAAMAAJ Outlines of electrical engineering]. London: Cassell and Co.
* Murray, J. E. (1907). [http://books.google.com/books?id=F141AAAAMAAJ A handbook of wireless telegraphy]. New York: D. Van Nostrand Co.; [etc.].
* Mazzotto, D., & Bottone, S. R. (1906). [http://books.google.com/books?id=SbI3AAAAMAAJ Wireless telegraphy and telephony]. London: Whittaker & Co.
* Collins, A. F. (1905). [http://books.google.com/books?id=RBNLAAAAMAAJ Wireless telegraphy; its history, theory and practice]. New York: McGraw Pub.
* Sewall, C. H. (1904). [http://books.google.com/books?id=3hZDAAAAIAAJ Wireless telegraphy: its origins, development, inventions, and apparatus]. New York: D. Van Nostrand.
* Trevert, E. (1904). [http://books.google.com/books?id=6xxIAAAAIAAJ The A.B.C. of wireless telegraphy; a plain treatise on Hertzian wave signaling; embracing theory, methods of operation, and how to build various pieces of the apparatus employed]. Lynn, Mass: Bubier Pub.
* Fahie, J. J. (1900). [http://books.google.com/books?id=U_ZUAAAAMAAJ A history of wireless telegraphy, 1838-1899: including some bare-wire proposals for subaqueous telegraphs]. Edinburgh: W. Blackwood and Sons.
* [http://books.google.com/books?id=JgwAAAAAMAAJ&pg=PA493&lr=&as_brr=1&ei=Y9OhSPPcEIL2iQG7hZ36BA#PPA493,M1 Telegraphing across space, Electric wave method]. The Electrical engineer. (1884). London: Biggs & Co.
* American Institute of Electrical Engineers. (1884). [http://books.google.com/books?id=l1lLAAAAMAAJ Transactions of the American Institute of Electrical Engineers]. New York: American Institute of Electrical Engineers. (ed., Contains ''Radio Telephony''&nbsp;— By E. B. Craft and E. H. Colpitts (Illustrated). [http://books.google.com/books?id=l1lLAAAAMAAJ&pg=PA305&as_brr=1#PPA305,M1 Page 305])

== 외부 링크 ==
* John Joseph Fahie, [http://www.archive.org/details/historyofwireles00fahirich ''A History of Wireless Telegraphy, 1838-1899: including some bare-wire proposals for subaqueous telegraphs''], 1899 (first edition).
* John Joseph Fahie, [http://www.archive.org/details/historywirelesst00fahirich ''A History of Wireless Telegraphy: including some bare-wire proposals for subaqueous telegraphs''], 1901 (second edition).
* John Joseph Fahie, [http://earlyradiohistory.us/1901fa.htm ''A History of Wireless Telegraphy: including some bare-wire proposals for subaqueous telegraphs''], 1901 (second edition, in HTML format).
* [[Alfred Thomas Story]], ''The Story of Wireless Telegraphy'', 1904 [http://www.archive.org/details/storyofwirelesst00storiala]
* [https://web.archive.org/web/20131121233941/http://home.frognet.net/~ejcov/lindsay3.html James Bowman Lindsay] A short biography on his efforts on electric lamps and telegraphy.
* [http://www.zianet.com/sparks/ Sparks Telegraph Key Review]
* [http://www.archive.org/download/principlesofradi00jansrich/principlesofradi00jansrich.pdf ''Principles of Radiotelegraphy'' (1919)]

{{전거 통제}}

[[분류:라디오]]
[[분류:전신]]
[[분류:무선 통신]]