Editing Television broadcaster (section)

===History===
Television broadcasting in the United States was heavily influenced by radio. Early individual experimental radio stations in the United States began limited operations in the 1910s. In November 1920, [[Westinghouse Broadcasting|Westinghouse]] signed on "the world's first commercially licensed radio station", [[KDKA (AM)|KDKA]] in [[Pittsburgh]], Pennsylvania.<ref>{{cite journal | last=Baudino| first=Joseph E| author2=John M. Kittross| title=Broadcasting's Oldest Stations: An Examination of Four Claimants| journal=Journal of Broadcasting| pages=61–82| date=Winter 1977| volume=21| doi=10.1080/08838157709363817|url=http://www.ieee.org/web/aboutus/history_center/kdka.html|access-date=8 August 2008|archive-url=https://web.archive.org/web/20080306145733/http://www.ieee.org/web/aboutus/history_center/kdka.html|archive-date=6 March 2008|url-status=dead}}</ref> Other companies built early radio stations in Detroit, [[Boston]], New York City and other areas. Radio stations received permission to transmit through [[broadcast license]]s obtained through the [[Federal Radio Commission]] (FRC), a government entity that was created in 1926 to regulate the radio industry. With some exceptions, radio stations east of the [[Mississippi River]] received official [[call sign]]s beginning with the letter "W"; those west of the Mississippi were assigned calls beginning with a "K". The number of programs that these early stations aired was often limited, in part due to the expense of program creation. The idea of a network system which would distribute programming to many stations simultaneously, saving each station the expense of creating all of their own programs and expandingus transmitted from station to station to listeners across the United States. Other companies, including [[CBS]] and the [[Mutual Broadcasting System]], soon followed suit, each network signed hundreds of individual stations on as affiliates: stations which agreed to broadcast programs from one of the networks.

As radio prospered throughout the 1920s and 1930s, experimental television stations, which broadcast both an audio and a video signal, began sporadic broadcasts. Licenses for these experimental stations were often granted to experienced radio broadcasters, and thus advances in television technology closely followed breakthroughs in radio technology. As interest in television grew, and as early television stations began regular broadcasts, the idea of networking television signals (sending one station's video and audio signal to outlying stations) was born. However, the signal from an electronic television system, containing much more information than a radio signal, required a broadband transmission medium. Transmission by a nationwide series of radio relay towers would be possible but extremely expensive.

Researchers at [[AT&T Corporation|AT&T]] subsidiary [[Bell Telephone Laboratories]] patented [[coaxial cable]] in 1929, primarily as a telephone improvement device. Its high capacity (transmitting 240 telephone calls simultaneously) also made it ideal for long-distance television transmission, where it could handle a frequency band of 1&nbsp;MHz.<ref>"[https://web.archive.org/web/20070305131809/http://www.time.com/time/magazine/article/0,9171,755145,00.html Coaxial Cable]", ''[[Time (magazine)|Time]]'', 14 October 1935.</ref> German television first demonstrated such an application in 1936 by relaying televised telephone calls from [[Berlin, Germany|Berlin]] to [[Leipzig, Germany|Leipzig]], {{convert|180|km|mi|abbr=on}} away, by cable.<ref>[http://www.tvhistory.tv/1936_German_Olympics_TV_Program_English.JPG Television in Germany], Berlin, 1936.</ref>

AT&T laid the first [[L-carrier]] coaxial cable between New York City and [[Philadelphia]], with automatic [[repeater|signal booster stations]] every {{convert|10|mi|km}}, and in 1937 it experimented with transmitting televised motion pictures over the line.<ref>"[http://www.earlytelevision.org/tv_piped.html Television 'Piped' From New York to Philadelphia] {{Webarchive|url=https://archive.today/20120730121316/http://www.earlytelevision.org/tv_piped.html |date=2012-07-30 }}," ''Short Wave & Television'', February 1938, pp. 534, 574–575.</ref> Bell Labs gave demonstrations of the New York–Philadelphia television link in 1940 and 1941. AT&T used the coaxial link to transmit the [[Republican National Convention]] in June 1940 from Philadelphia to New York City, where it was televised to a few hundred receivers over the NBC station W2XBS (which evolved into [[WNBC]]) as well as seen in Schenectady, New York via W2XB (which evolved into [[WRGB]]) via off-air relay from the New York station.<ref>[http://www.ushistory.org/gop/convention_1940.htm GOP Convention of 1940 in Philadelphia], UShistory.org.</ref>

NBC had earlier demonstrated an inter-city television broadcast on 1 February 1940, from its station in New York City to another in [[Schenectady, New York|Schenectady]], New York by [[General Electric]] relay antennas, and began transmitting some programs on an irregular basis to Philadelphia and Schenectady in 1941. Wartime priorities suspended the manufacture of television and radio equipment for civilian use from 1 April 1942 to 1 October 1945, temporarily shutting down expansion of television networking. However, in 1944 a short film, "[[Patrolling the Ether]]", was broadcast simultaneously over three stations as an experiment.

[[File:DuMont Affiliates 1949.png|thumb|right|upright=1.35|The DuMont Television Network in 1949. DuMont's network of stations stretched from Boston to St. Louis. These stations were linked together via AT&T's [[coaxial cable]] feed, allowing the network to broadcast [[live television]] programming to all the stations at the same time. Stations not yet connected received [[kinescope]] recordings via physical delivery.]]
AT&T made its first postwar addition in February 1946, with the completion of a {{convert|225|mi|km|adj=on}} cable between New York City and Washington, D.C., although a blurry demonstration broadcast showed that it would not be in regular use for several months. The [[DuMont Television Network]], which had begun experimental broadcasts before the war, launched what ''[[Newsweek]]'' called "the country's first permanent commercial television network" on 15 August 1946, connecting New York City with Washington.<ref>{{Cite book |last=Edgerton |first=Gary |url=https://books.google.com/books?id=x4p3XMOeq7oC&dq=the+country%27s+%22first+permanent+commercial+television+network%22&pg=PA84 |title=The Columbia History of American Television |date=2007-10-12 |publisher=Columbia University Press |isbn=978-0-231-51218-3 |pages=84 |language=en}}</ref><ref name="Weinstein">Weinstein, David (2004). ''The Forgotten Network: DuMont and the Birth of American Television'' Temple University Press: Philadelphia, p. 16-17. {{ISBN|1-59213-499-8}}.</ref> Not to be outdone, NBC launched what it called "the world's first regularly operating television network" on 27 June 1947, serving New York City, Philadelphia, Schenectady and Washington.<ref>"[https://web.archive.org/web/20070305132033/http://www.time.com/time/magazine/article/0,9171,934668,00.html Beginning]," ''[[Time (magazine)|Time]]'', 7 July 1947.</ref> [[Baltimore]] and Boston were added to the NBC television network in late 1947. DuMont and NBC would be joined by CBS and [[American Broadcasting Company|ABC]] in 1948.

In the 1940s, the term "chain broadcasting" was used when discussing network broadcasts,<ref name="Yale">"The Impact of the FCC's Chain Broadcasting Rules". ''The Yale Law Journal'', 60(1) (1951): 78–111</ref> as the television stations were linked together in long chains along the [[East Coast (US)|East Coast]]. But as the television networks expanded westward, the interconnected television stations formed major networks of connected affiliate stations. In January 1949, with the sign-on of DuMont's [[KDKA-TV|WDTV]] in Pittsburgh, the [[Midwestern United States|Midwest]] and [[East Coast of the United States|East Coast]] networks were finally connected by coaxial cable (with WDTV airing the best shows from all four networks).<ref>{{cite news|url = http://www.post-gazette.com/pg/10136/1058239-426.stm|work = Pittsburgh Post-Gazette |title= Eyewitness: 1949 / TV makes Pittsburgh 'A New Promise'|date = 16 May 2010|first =  Len |last = Barcousky}}</ref> By 1951, the four networks stretched from coast to coast, carried on the new [[microwave radio relay]] network of [[AT&T Long Lines]]. Only a few local television stations remained [[independent station (North America)|independent]] of the networks.

Each of the four major television networks originally only broadcast a few hours of programs a week to their affiliate stations, mostly between 8:00 and 11:00&nbsp;p.m. [[Eastern Time Zone|Eastern Time]], when most viewers were watching television. Most of the programs broadcast by the television stations were still locally produced. As the networks increased the number of programs that they aired, however, officials at the [[Federal Communications Commission]] (FCC) grew concerned that local television might disappear altogether. Eventually, the federal regulator enacted the [[Prime Time Access Rule]], which restricted the amount of time that the networks could air programs; officials hoped that the rules would foster the development of quality local programs, but in practice, most local stations did not want to bear the burden of producing many of their own programs, and instead chose to purchase programs from independent producers. Sales of television programs to individual local stations are done through a method called "broadcast syndication", and today nearly every television station in the United States obtains syndicated programs in addition to network-produced fare.

Late in the 20th century, cross-country microwave radio relays were replaced by fixed-service satellites. Some terrestrial radio relays remained in service for regional connections.

After the failure and shutdown of DuMont in 1956, several attempts at new networks were made between the 1950s and the 1970s, with little success. The [[Fox Broadcasting Company]], founded by the [[Rupert Murdoch]]-owned [[News Corporation (1980–2013)|News Corporation]] (now owned by [[Fox Corporation]]), was launched on 9 October 1986 after the company purchased the television assets of [[Metromedia]]; it would eventually ascend to the status of the [[fourth television network|fourth major network]] by 1994. Two other networks launched within a week of one another in January 1995: [[The WB]] Television Network, a joint venture between [[Time Warner]] and the [[Tribune Company]], and the United Paramount Network ([[UPN]]), formed through a programming alliance between [[Chris-Craft Industries]] and [[Paramount Television]] (whose parent, [[Viacom (original)|Viacom]], would later acquire half and later all of the network over the course of its existence). In September 2006, [[The CW]] was launched as a "merger" of The WB and UPN (in actuality, a consolidation of each respective network's higher-rated programs onto one schedule); [[MyNetworkTV]], a network formed from affiliates of UPN and The WB that did not affiliate with The CW, launched at the same time.