In the United States, the Public Broadcasting Service (PBS) serves as the nation's main public television provider. When it launched in October 1970, PBS assumed many of the functions of its predecessor,
National Educational Television (NET). NET was shut down by the
Ford Foundation and the Corporation for Public Broadcasting after the network refused to stop airing documentaries on varying social issues that had received critical acclaim for their hard-hitting focus, but alienated many of the network's affiliates. NET's constant need for additional funding led the Ford Foundation to begin withdrawing its financial support of the network in 1966, shouldering much of the responsibility for providing revenue for NET onto its affiliated stations, prior to the foundation of the CPB, which intended to create its own public television service. PBS' incorporation coincided with the merger of NET's
New York City station,
Newark, New Jersey-licensed WNDT (which became
WNET), into National Educational Television, the impetus of which was to continue receiving funding by Ford and the CPB. PBS also took over the rights to certain programs that originated on NET prior to its disestablishment (such as ''
Mister Rogers' Neighborhood, Washington Week in Review and Sesame Street'', the latter two of which continue to air on PBS to this day). PBS would later acquire
Educational Television Stations, an organization founded by the
National Association of Educational Broadcasters (NAEB), in 1973. PBS and American Public Television (formerly Eastern Educational Television Network) distribute television programs to a nationwide system of independently owned and operated television stations (some having the term "PBS" in their branding) supported largely by state and federal governments as well as viewer support (including from pledge drives that many public television outlets carry for two- to three-week periods at least twice per year, at dates that vary depending on the station or regional network), with commercial underwriters donating to specific programs and receiving a short thanks for their contributions. Such underwriting may only issue declarative statements (including slogans) and may not include "calls to action" (i.e., the station cannot give out prices, comparative statements, or anything that would persuade the listener to patronize the sponsor). The majority of public television stations are owned by educational institutions and independent entities (including colleges and universities, municipal education boards, and nonprofit organizations); however, some statewide public television networks are operated as state government agencies, and some standalone public television stations serving an individual market are run by a municipal government or a related agency within it. Unlike National Public Radio, however, PBS largely does not produce any of the programs it broadcasts nor has an in-house news division; all PBS programs are produced by individual member stations and outside production firms for distribution to its member stations through the network feed. With the exception of a few secondary or tertiary stations in certain major and mid-sized cities that rely entirely on syndicated content from American Public Television and other distributors, the vast majority of public television stations in the U.S. are member outlets of PBS. Of the 354 PBS members currently operating (which account for 97% of the 365 public television stations in the U.S.), roughly half belong to one of 40 state or regional networks, which carry programming fed by a parent station to a network of
satellite transmitters throughout the entirety or a sub-region of an individual state; this model is also used by some public radio station groups (mainly those co-owned with a PBS member network). In a deviation from the affiliation model that began to emerge in commercial broadcast television in the late 1950s, in which a single station holds the exclusive local rights to a network's programming schedule, PBS maintains memberships with more than one non-commercial educational station in select markets (such as
Los Angeles and
Chicago, which both have three PBS member stations); in these conflict markets, PBS members which participate in the service's Program Differentiation Plan (PDP) are allocated a percentage of PBS-distributed programming for their weekly schedule – the highest total of which is usually allocated to the market's "primary" PBS station – often resulting certain programs airing on the PDP outlets on a delayed basis, unless the primary or an additional member station holds market exclusivity over a particular program. As with commercial
network affiliates, PBS member stations are given the latitude to schedule programs supplied by PBS for national broadcast in time slots of their choosing, particularly in the case of its prime time lineup, or preempt them outright. PBS stations typically broadcast children's programming supplied by the service and through independent distributors like American Public Television during the morning and afternoon hours, and on many though not all stations, on weekend mornings; most public independent stations also carry children's programming, though, they may not as broadly encompass those stations' daytime schedules as is common with PBS member outlets. Many member stations have also aired
distance education and other
instructional television programs for use in public and private schools and
adult education courses (since the 2000s, many public television stations have relegated these programs to
digital subchannels that the station may maintain or exclusively via the Internet). PBS also provides a base prime time programming schedule, featuring a mix of documentaries, arts and how-to programming, and scripted dramas. Acquired programming distributed directly to public television stations – such as imported series, documentaries and theatrically released feature films, political and current affairs shows, and home improvement, gardening and cooking programs – fill the remainder of the station's broadcast day. PBS and public independent stations also produce programs of local interest, including local newscasts and/or newsmagazines, public affairs shows, documentaries, and in some areas, gavel-to-gavel coverage of state legislative proceedings. With the advent of digital television, additional public television networks – most of which have direct or indirect association with PBS – have also launched, to provide additional cultural, entertainment and instructional programming. PBS operates three such networks:
PBS Kids, a network featuring children's programs aired on the main PBS feed's daytime schedule;
PBS HD Channel, a dedicated feed consisting of
high-definition content; and the
PBS Satellite Service, a full-time alternate feed of programming selected from the main PBS service, which is also carried on some member stations as an overnight programming feed. Independent services include
Create, an American Public Television-operated network featuring how-to, home and garden, cooking and travel programs;
MHz Worldview, a network owned by
MHz Networks, which carries international dramatic series (particularly crime drama), news programs and documentaries; and
World, a joint venture of American Public Television, WNET, the
WGBH Educational Foundation and the National Educational Telecommunications Association that broadcasts science, nature, news, public affairs and documentary programs. Most communities also have
public-access television channels on local
cable television systems, which are generally paid for by
cable television franchise fees and sometimes supported in part through citizen donations. ==See also ==