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Most US NTSC broadcasters were required by the FCC to shut down their analog transmitters in 2009.Low-power stations, Class A stations and translators were required to shut down by 2015.The first color NTSC television camera was the RCA TK-40, used for experimental broadcasts in 1953; an improved version, the TK-40A, introduced in March 1954, was the first commercially available color television camera.Later that year, the improved TK-41 became the standard camera used throughout much of the 1960s.In 1953 a second NTSC standard was adopted, which allowed for color television broadcasting which was compatible with the existing stock of black-and-white receivers.
These changes amount to 0.1 percent and were readily tolerated by existing television receivers.is the analog television system that is used in North America, and until digital conversion was used in most of the Americas (except Brazil, Argentina, Paraguay, Uruguay, and French Guiana); Myanmar; South Korea; Taiwan; Philippines, Japan; and some Pacific island nations and territories (see map).The first NTSC standard was developed in 1941 and had no provision for color.Legal action by rival RCA kept commercial use of the system off the air until June 1951, and regular broadcasts only lasted a few months before manufacture of all color television sets was banned by the Office of Defense Mobilization in October, ostensibly due to the Korean War.In December 1953 the FCC unanimously approved what is now called the NTSC color television standard (later defined as RS-170a).
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This blanking interval was originally designed to simply blank the receiver's CRT to allow for the simple analog circuits and slow vertical retrace of early TV receivers.