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The class A television service is a system for regulating some low-power television (LPTV) stations in the United States. Class A stations are denoted by the broadcast callsign suffix "-CA" (analog) or "-CD" (digital), although very many analog -CA stations have a digital companion channel that was assigned the -LD suffix used by regular (non-class-A) digital LPTV stations. The FCC created this category of service as a result of the Community Broadcasters Protection Act of 1999. Support for this ruling came largely from the Community Broadcasters Association, an industry group representing low-power TV station operators.〔(FCC, April 21, 1998, Petition for rulemaking for "CLASS A" TV service )〕 Unlike traditional LPTV stations, class-A stations were given primary status during the transition to digital television (DTV), meaning that a full-service television station could not displace a class A LPTV station from its broadcast frequency (TV channel), except in rare cases. In contrast, traditional LPTV stations often found their frequencies assigned to full-service DTV operations, forcing them to relocate to another frequency. This was especially true in large cities, where available broadcast spectrum was scarce, and LPTV stations found themselves forced to cease operations due to no suitable spectrum. This was especially so with the taking of the 700 MHz band (channels 52 to 69) from the upper UHF TV band. == Requirements == In exchange for the added broadcast protections, class-A stations are required to be more responsible in covering the community they serve. Class-A stations must: * Broadcast a minimum of 18 hours per day * Broadcast an average of at least three hours per week of programming produced within the media market area served by the station * Be in compliance with the Commission's requirements for both LPTV stations and full-power television stations * Broadcast on a core frequency (channels 2 - 51) * Broadcast the minimum required amount of Children's "E/I" core programming * Be capable of airing Emergency Alert System broadcasts when/if the need arises An LPTV station could also qualify for class-A status if it follows the FCC's "public interest, convenience, and necessity" standards. 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「Class A television service」の詳細全文を読む スポンサード リンク
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