Portal:Telecommunication
The Telecommunication Portal
Telecommunication, often used in its plural form, is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from the definition. Many transmission media have been used for telecommunications throughout history, from smoke signals, beacons, semaphore telegraphs, signal flags, and optical heliographs to wires and empty space made to carry electromagnetic signals. These paths of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Several methods of long-distance communication before the modern era used sounds like coded drumbeats, the blowing of horns, and whistles. Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph, telephone, television, and radio.
Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In the first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communications by Guglielmo Marconi, who won the 1909 Nobel Prize in Physics. Other early pioneers in electrical and electronic telecommunications include co-inventors of the telegraph Charles Wheatstone and Samuel Morse, numerous inventors and developers of the telephone including Antonio Meucci and Alexander Graham Bell, inventors of radio Edwin Armstrong and Lee de Forest, as well as inventors of television like Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth.
Since the 1960s, the proliferation of digital technologies has meant that voice communications have gradually been supplemented by data. The physical limitations of metallic media prompted the development of optical fibre. The Internet, a technology independent of any given medium, has provided global access to services for individual users and further reduced location and time limitations on communications. (Full article...)
Selected article -
In radio-frequency engineering and communications engineering, waveguide is a hollow metal pipe used to carry radio waves. This type of waveguide is used as a transmission line mostly at microwave frequencies, for such purposes as connecting microwave transmitters and receivers to their antennas, in equipment such as microwave ovens, radar sets, satellite communications, and microwave radio links.
The electromagnetic waves in a (metal-pipe) waveguide may be imagined as travelling down the guide in a zig-zag path, being repeatedly reflected between opposite walls of the guide. For the particular case of rectangular waveguide, it is possible to base an exact analysis on this view. Propagation in a dielectric waveguide may be viewed in the same way, with the waves confined to the dielectric by total internal reflection at its surface. Some structures, such as non-radiative dielectric waveguides and the Goubau line, use both metal walls and dielectric surfaces to confine the wave. (Full article...)General images
-
The "Kerbango Internet Radio" was the first stand-alone product that let users listen to Internet radio without a computer. (from History of broadcasting)
-
Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone)
-
Right side view, housing removed, one of its printed circuit boards exposed (courtesy: Richard Diehl) (from History of videotelephony)
-
Old Receiver schematic, c.1906 (from History of the telephone) -
Color bars used in a test pattern, sometimes used when no program material is available. (from History of television) -
A 19th century acoustic tin can or "lovers' telephone" (from History of the telephone) -
Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter (microphone), invented 1876 and first displayed at the Centennial Exposition, Philadelphia. (from History of the telephone)
-
Swedish Prime Minister Tage Erlander using an Ericsson videophone to speak with Lennart Hyland, a popular TV show host (1969) (from History of videotelephony)
-
Around 1920, radio broadcasting started to get popular. The Brox Sisters, a popular singing group, gathered around the radio at the time. (from History of radio)
-
The British Broadcasting Corporation's landmark and iconic London headquarters, Broadcasting House, opened in 1932. At right is the 2005 eastern extension, the John Peel wing. (from History of broadcasting)
-
"Fiction becomes fact": Imaginary "Edison" combination videophone-television, conceptualized by George du Maurier and published in Punch magazine. The drawing also depicts then-contemporary speaking tubes, used by the parents in the foreground and their daughter on the viewing display (1878). (from History of videotelephony)
-
1896 Telephone (Sweden) (from History of the telephone)
-
RCA 630-TS, the first mass-produced television set, which sold in 1946–1947 (from History of television)
-
Caricature of Sir John Reith, by Wooding (from History of broadcasting)
-
Artist's conception: 21st-century videotelephony imagined in the early 20th century (1910) (from History of videotelephony)
-
The Philco Predicta, 1958. In the collection of The Children's Museum of Indianapolis (from History of television)
-
British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897. (from History of radio)
-
Modern Apple iPhone. This phone is considered a smartphone (from History of the telephone) -
Public television in France uses 819 line b&w high definition, from 1959 until 1983 (TF1). (from History of television) -
Typical low-cost webcam used with many personal computers (from History of videotelephony)
-
A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany (from History of telecommunication)
-
Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s (from History of broadcasting)
-
Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation (from History of radio)
-
Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves (from History of radio) -
The master telephone patent granted to Bell, 174465, March 10, 1876 (from History of the telephone)
-
Charles Logwood broadcasting at station 2XG, New York City, circa November, 1916 (from History of broadcasting)
-
Manfred von Ardenne in 1933 (from History of television)
-
"Doc" Herrold is shown at the microphone of KQW, early 1920s. (from History of broadcasting)
-
Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
-
Guglielmo Marconi (from History of broadcasting)
-
DBS satellite dishes. (from History of television)
-
Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. (from History of the telephone)
-
Top of cellular telephone tower (from History of the telephone)
-
The Kyocera VP-210 Visual Phone was the first commercial mobile videophone. The Personal Handy-phone System (PHS) phone was introduced in Japan (1999). (from History of videotelephony)
-
Antonio Meucci's telephone. (from History of the telephone)
-
Family watching TV, 1958 (from History of television)
-
Broadcasting pioneer Frank Conrad in a 1921 portrait (from History of broadcasting)
-
Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone)
-
Private conversation, 1910 (from History of the telephone)
-
The Nipkow disk. This schematic shows the circular paths traced by the holes, which may also be square for greater precision. The area of the disk outlined in black shows the region scanned. (from History of television) -
The French Matra videophone (1970) (from History of videotelephony)
-
Baird in 1925 with his televisor equipment and dummies "James" and "Stooky Bill" (right). (from History of television) -
The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion (triode) in 1906 (from History of radio)
-
Antonio Meucci, 1854, constructed telephone-like devices. (from History of the telephone)
-
The first mass-produced Czechoslovak TV-set Tesla 4001A (1953–57) (from History of television)
-
1917 wall telephone, open to show magneto and local battery (from History of the telephone)
-
Ad for the beginning of experimental television broadcasting in New York City by RCA in 1939 (from History of television)
-
Australian radio sets usually had the positions of radio stations marked on their dials. The illustration is a dial from a transistorised, mains-operated Calstan radio, circa 1960s. (Click image for a high resolution view, with readable callsigns.) (from History of broadcasting)
-
The 1969 AT&T Mod II Picturephone, the result of decades long R&D at a cost of over $500M. (from History of telecommunication)
-
Reginald Fessenden (around 1906) (from History of radio)
-
AT&T Picturephone (Mod II) fully enclosed in its housing, control pad at bottom (courtesy: Richard Diehl) (from History of videotelephony)
-
Philo Farnsworth in 1924 (from History of television) -
Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone)
-
The Marconi Company was formed in England in 1910. The photo shows a typical early scene, from 1906, with Marconi employee Donald Manson at right. (from History of broadcasting)
-
Lee DeForest broadcasting Columbia phonograph records on pioneering New York station 2XG, in 1916 (from History of broadcasting)
-
AT&T magazine advertisement announcing commercial launch of Picturephone service. (from History of videotelephony)
-
A French Gower telephone of 1912 at the Musée des Arts et Métiers in Paris (from History of the telephone)
-
Emil Voigt, founder of 2KY on behalf of the Labor Council of New South Wales. This photo was taken in earlier days when Voight was a prominent British athlete, and winner of the Gold Medal for the five mile race at the 1908 Summer Olympics in London. (from History of broadcasting)
-
First television test broadcast transmitted by the NHK Broadcasting Technology Research Institute in May 1939 (from History of television) -
In the 1920s, the United States government publication, "Construction and Operation of a Simple Homemade Radio Receiving Outfit", showed how almost any person handy with simple tools could a build an effective crystal radio receiver. (from History of radio)
-
The Australian Broadcasting Corporation logo, first introduced in 1975 and based on the Lissajous curve (from History of broadcasting) -
Bell prototype telephone stamp(from History of the telephone)
Centennial Issue of 1976 -
The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. (from History of radio)
-
Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) (from History of telecommunication) -
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. (from History of the telephone)
-
Reginald Fessenden, the "father" of radio broadcasting in the US (from History of broadcasting)
-
An exposed view of the Picturephone's rear circuit board (courtesy: Richard Diehl) (from History of videotelephony)
-
An early Smart TV from 2012 running the discontinued Orsay platform (from History of television)
-
The master telephone patent, 174465, granted to Bell, March 7, 1876 (from History of telecommunication)
-
Early experiment demonstrating refraction of microwaves by a paraffin lens by John Ambrose Fleming in 1897 (from History of radio)
.jpg/1280px-Actor_portraying_Alexander_Graham_Bell_in_an_AT&T_promotional_film_(1926).jpg)
_LCCN2014717186.jpg/1280px-Brox_(Sisters)_LCCN2014717186.jpg)
.svg){kind=logo}
.jpg/1280px-Samsung_Smart_TV_2012_(E-Series).jpg)
Things to do
 |
Here are some tasks awaiting attention:
|
Selected biography -
Philo Taylor Farnsworth (August 19, 1906 – March 11, 1971) was an American inventor and television pioneer. He made the critical contributions to electronic television that made possible all the video in the world today. He is best known for his 1927 invention of the first fully functional all-electronic image pickup device (video camera tube), the image dissector, as well as the first fully functional and complete all-electronic television system. Farnsworth developed a television system complete with receiver and camera—which he produced commercially through the Farnsworth Television and Radio Corporation from 1938 to 1951, in Fort Wayne, Indiana.
In later life, Farnsworth invented a small nuclear fusion device, the Farnsworth Fusor, employing inertial electrostatic confinement (IEC). Like many fusion devices, it was not a practical device for generating nuclear power, although it provides a viable source of neutrons. The design of this device has been the inspiration for other fusion approaches, including the Polywell reactor concept. Farnsworth held 300 patents, mostly in radio and television. (Full article...)Did you know (auto-generated) -
- ... that New Zealand singer Fanny Howie composed the song "Hine E Hine", which aired on New Zealand television every night from 1981 to 1994?
- ... that the owner of a radio station in Hawaii changed its call letters to KIMO because the Hawaiian name Kimo translates to Jim, the owner's name?
- ... that Lucy Feagin founded the Feagin School of Dramatic Art in New York City, where talent scouts for radio, screen, and stage were always present to watch her senior students' plays?
- ... that in 1951, the University of Arizona radio bureau produced four different programs that aired on four different Tucson stations?
- ... that former CIA agent Bazzel Baz was hired to be a consultant for The Blacklist television series and instead became a cast member?
- ... that unmarried staff of the radio station AFN Frankfurt lived in a medieval tower?
Related portals
Topics
Telecommunications in Asia | |
|---|---|
| Sovereign states |
|
| States with limited recognition |
|
| Dependencies and other territories |
|
Subcategories
Associated Wikimedia
The following Wikimedia Foundation sister projects provide more on this subject:
-
Commons
Free media repository -
Wikibooks
Free textbooks and manuals -
Wikidata
Free knowledge base -
Wikinews
Free-content news -
Wikiquote
Collection of quotations -
Wikisource
Free-content library -
Wikiversity
Free learning tools -
Wiktionary
Dictionary and thesaurus
.jpg){kind=link}
_LCCN2014717186.jpg){kind=link}
.jpg){kind=link}
