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188-450: Common media include AM , FM , and shortwave radio ; television; and the Internet . Public broadcasting may be nationally or locally operated, depending on the country and the station. In some countries a single organization runs public broadcasting. Other countries have multiple public-broadcasting organizations operating regionally or in different languages. Historically, public broadcasting

376-449: A marina , and hosts wakeboarders and windsurfers . Diving can also be practiced and one of the main attractions is Vila Amaury, an old village submerged in the lake. This is where the first construction workers of Brasilia used to live. Brasilia has a tropical savanna climate ( Aw , according to the Köppen climate classification ), milder due to the elevation and with two distinct seasons:

564-465: A "chain". The Radio Corporation of America (RCA), General Electric , and Westinghouse organized a competing network around its own flagship station, RCA's WJZ (now WABC) in New York City, but were hampered by AT&T's refusal to lease connecting lines or allow them to sell airtime. In 1926 AT&T sold its radio operations to RCA, which used them to form the nucleus of the new NBC network. By

752-841: A 10 shilling receiver license fee. Both highbrow and mass-appeal programmes were carried by the National and Regional networks. The period from the early 1920s through the 1940s is often called the "Golden Age of Radio". During this period AM radio was the main source of home entertainment, until it was replaced by television. For the first time entertainment was provided from outside the home, replacing traditional forms of entertainment such as oral storytelling and music from family members. New forms were created, including radio plays , mystery serials, soap operas , quiz shows , variety hours , situation comedies and children's shows . Radio news, including remote reporting, allowed listeners to be vicariously present at notable events. Radio greatly eased

940-857: A PBS member station – through pay television providers in Canada via member stations located near the U.S.–Canada border . These educational public broadcasters include the English-language TVOntario (TVO) and the French-language TFO in Ontario , Télé-Québec in Quebec , and Knowledge Network in British Columbia . TVO and Télé-Québec operate through conventional transmitters and cable, while TFO and Knowledge Network are cable-only channels. Beyond these and other provincial services, Canada does not have

1128-470: A cable-only educational and cultural public broadcaster owned by the government of Saskatchewan . SCN was sold to Bluepoint Investment Corporation in 2010, and like CTV Two Alberta did when it became privatized, incorporated a limited schedule of entertainment programming during the late afternoon and nighttime hours, while retaining educational and children's programs during the morning until mid-afternoon to fulfill its licensing conditions; Bluepoint later sold

1316-557: A central station to all parts of the United States", he was unable to overcome the inherent distance limitations of this technology. The earliest public radiotelegraph broadcasts were provided as government services, beginning with daily time signals inaugurated on January 1, 1905, by a number of U.S. Navy stations. In Europe, signals transmitted from a station located on the Eiffel Tower were received throughout much of Europe. In both

1504-442: A citizen. The British model is often referenced in definitions. The model embodies the following principles: While the application of certain principles may be straightforward, as in the case of accessibility, some of the principles may be poorly defined or difficult to implement. In the context of a shifting national identity, the role of public broadcasting may be unclear. Likewise, the subjective nature of good programming may raise

1692-536: A community-funded radio network. CJRT-FM in Toronto also operated as a public government-owned radio station for many years; while no longer funded by the provincial government, it still solicits most of its budget from listener and corporate donations and is permitted to air only a very small amount of commercial advertising. City Saskatchewan originated as the Saskatchewan Communications Network,

1880-596: A concerted attempt to specify performance of AM receivers through the 1993 AMAX standard, a joint effort of the EIA and the NAB, with FCC backing... The FCC rapidly followed up on this with codification of the CQUAM AM stereo standard, also in 1993. At this point, the stage appeared to be set for rejuvenation of the AM band. Nevertheless, with the legacy of confusion and disappointment in the rollout of

2068-517: A consistent 22 °C (72 °F). With 253.1 mm (10.0 in), November is the month with the highest rainfall of the year, while July is the lowest, with only 1.5 mm (0.1 in). During the dry season, the city can have very low relative humidity levels, often below 30%. According to the Brazilian National Institute of Meteorology (INMET) , the record low temperature was 1.6 °C (34.9 °F) on 18 July 1975, and

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2256-617: A consortium, the British Broadcasting Company (BBC), established on 18 October 1922, which was given a monopoly on broadcasting. This enterprise was supported by a tax on radio sets sales, plus an annual license fee on receivers, collected by the Post Office. Initially the eight stations were allowed regional autonomy. In 1927, the original broadcasting organization was replaced by a government chartered British Broadcasting Corporation . an independent nonprofit supported solely by

2444-552: A continuous-wave (CW) transmitter. Fessenden began his research on audio transmissions while doing developmental work for the United States Weather Service on Cobb Island, Maryland. Because he did not yet have a continuous-wave transmitter, initially he worked with an experimental "high-frequency spark" transmitter, taking advantage of the fact that the higher the spark rate, the closer a spark-gap transmission comes to producing continuous waves. He later reported that, in

2632-525: A cross, often likened to a dragonfly, an airplane or a bird. Costa's plan included two principal components, the Monumental Axis (east to west) and the Residential Axis (north to south). The Monumental Axis was assigned political and administrative activities, and is considered the body of the city with the style and simplicity of its buildings, oversized scales, and broad vistas and heights, producing

2820-568: A few " telephone newspaper " systems, most of which were established in Europe, beginning with the Paris Théâtrophone . With this in mind, most early radiotelephone development envisioned that the device would be more profitably developed as a "wireless telephone" for personal communication, or for providing links where regular telephone lines could not be run, rather than for the uncertain finances of broadcasting. The person generally credited as

3008-463: A few hundred ( Hz ), to increase its rotational speed and so generate currents of tens-of-thousands Hz, thus producing a steady continuous-wave transmission when connected to an aerial. The next step, adopted from standard wire-telephone practice, was to insert a simple carbon microphone into the transmission line, to modulate the carrier wave signal to produce AM audio transmissions. However, it would take many years of expensive development before even

3196-525: A foreign population of mostly embassy workers as well as large numbers of Brazilian internal migrants . Today, the city has important communities of immigrants and refugees. The city's Human Development Index was 0.936 in 2000 ( developed level), and the city's literacy rate was around 95.65%. Christianity is by far the most prevalent religion in Brasília, with Roman Catholicism being the largest denomination. Source: IBGE 2010. Brasília does not have

3384-587: A frequency of 96.9 FM MHz founded by the president of that era, Alfonso Quiñónez Molina . On 4 November 1964 the Government of El Salvador founded Televisión Educativa de El Salvador as an educational television with the channels 8 and 10. And since 1989, Channel 10 became the only public television channel in El Salvador. In Mexico, public stations are operated by municipalities, state governments and universities, there are five national public channels. Canal Once

3572-416: A government department under the administrative hierarchy, it enjoys editorial independence . It operates seven radio channels and produces television programmes and broadcast on commercial television channels, as these channels are required by law to provide timeslots for RTHK television programmes. RTHK would be assigned a digital terrestrial television channel during 2013 to 2015. In India, Prasar Bharati

3760-512: A home audio device prior to the introduction of the high-fidelity , long-playing record in the late 1940s. Listening habits changed in the 1960s due to the introduction of the revolutionary transistor radio (Regency TR-1, the first transistor radio released December 1954), which was made possible by the invention of the transistor in 1948. (The transistor was invented at Bell labs and released in June 1948.) Their compact size — small enough to fit in

3948-523: A large amount of households has led the receiving fee to become something of a political issue. NHK runs two national terrestrial TV stations ( NHK General and NHK Educational ) and three satellite only services ( NHK BS , NHK BS Premium4K , and NHK BS8K services). NHK also runs 3 national radio services and a number of international radio and television services, akin to the BBC World Service . NHK has also been an innovator in television, developing

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4136-469: A listening site at Plymouth, Massachusetts. An American Telephone Journal account of the December 21 alternator-transmitter demonstration included the statement that "It is admirably adapted to the transmission of news, music, etc. as, owing to the fact that no wires are needed, simultaneous transmission to many subscribers can be effected as easily as to a few", echoing the words of a handout distributed to

4324-479: A majority of early broadcasting stations operated on mediumwave frequencies, whose limited range generally restricted them to local audiences. One method for overcoming this limitation, as well as a method for sharing program costs, was to create radio networks , linking stations together with telephone lines to provide a nationwide audience. In the U.S., the American Telephone and Telegraph Company (AT&T)

4512-528: A mayor or councillors, because article 32 of the Constitution of Brazil expressly prohibits the Federal District being divided into municipalities . The Federal District is a legal entity of internal public law , which is part of the political-administrative structure of Brazil of a sui generis nature, because it is neither a state nor a municipality , but rather a special entity that incorporates

4700-570: A national educational public television network ( TV Cultura , launched in 1969 in São Paulo , which is available in all Brazilian states through its 135 affiliates), two radio stations ( Rádio Cultura FM and Rádio Cultura Brasil, both broadcasting to Greater São Paulo ), two educational TV channels aimed at distance education (TV Educação and Univesp TV, which is available on free-to-air digital TV in São Paulo and nationally by cable and satellite), and

4888-410: A national programming network. TVRI operates three national television channels, plus more than 32 regional stations. There are also independent local public broadcasters which founded by local government in several cities or regencies. They are obligated to network with either RRI or TVRI, depending on the medium, though they are not owned and operated by the two. In Japan, the main public broadcaster

5076-504: A national public educational network. Canada is also home to a number of former public broadcasting entities that have gone private. CTV Two Alberta , which is licensed as an educational television station in Alberta, was once owned by the Alberta government as the public broadcaster Access. In 1993, the provincial government agreed to cease to direct funding of Access after the 1994 fiscal year;

5264-503: A national scale. The introduction of nationwide talk shows, most prominently Rush Limbaugh 's beginning in 1988, was sometimes credited with "saving" AM radio. However, these stations tended to attract older listeners who were of lesser interest to advertisers, and AM radio's audience share continued to erode. In 1961, the FCC adopted a single standard for FM stereo transmissions, which was widely credited with enhancing FM's popularity. Developing

5452-555: A plan to the General Assembly of Brazil for a new city called Brasilia, with the idea of moving the capital westward from the heavily populated southeastern corridor. The bill was not enacted because Pedro I dissolved the Assembly . According to a legend, Italian saint Don Bosco in 1883 had a dream in which he described a futuristic city that roughly fitted Brasilia's location. In Brasilia today, many references to Bosco, who founded

5640-399: A policy allowing AM stations to simulcast over FM translator stations. Translators had previously been available only to FM broadcasters, in order to increase coverage in fringe areas. Their assignment for use by AM stations was intended to approximate the station's daytime coverage, which in cases where the stations reduced power at night, often resulted in expanded nighttime coverage. Although

5828-482: A prototype alternator-transmitter would be ready, and a few years beyond that for high-power versions to become available. Fessenden worked with General Electric 's (GE) Ernst F. W. Alexanderson , who in August 1906 delivered an improved model which operated at a transmitting frequency of approximately 50 kHz, although at low power. The alternator-transmitter achieved the goal of transmitting quality audio signals, but

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6016-665: A radio network in November 1936. It is the successor to the Canadian Radio Broadcasting Commission (CRBC), which was established by the administration of Prime Minister R.B. Bennett in 1932, modeled on recommendations made in 1929 by the Royal Commission on Radio Broadcasting and stemming from lobbying efforts by the Canadian Radio League . The Canadian Broadcasting Corporation took over operation of

6204-423: A result, AM radio tends to do best in areas where FM frequencies are in short supply, or in thinly populated or mountainous areas where FM coverage is poor. Great care must be taken to avoid mutual interference between stations operating on the same frequency. In general, an AM transmission needs to be about 20 times stronger than an interfering signal to avoid a reduction in quality, in contrast to FM signals, where

6392-492: A secondary affiliate of the English language CBC Television service. CBC operates two national television networks ( CBC Television and Ici Radio-Canada Télé ), four radio networks ( CBC Radio One , CBC Radio 2 , Ici Radio-Canada Première , and Ici Musique ) and several cable television channels including two 24-hour news channels ( CBC News Network and Ici RDI ) in both of Canada's official languages – English and French – and

6580-452: A shirt pocket — and lower power requirements, compared to vacuum tubes, meant that for the first time radio receivers were readily portable. The transistor radio became the most widely used communication device in history, with billions manufactured by the 1970s. Radio became a ubiquitous "companion medium" which people could take with them anywhere they went. The demarcation between what is considered "experimental" and "organized" broadcasting

6768-427: A short-range "wireless telephone" demonstration, that included simultaneously broadcasting speech and music to seven locations throughout Murray, Kentucky. However, this was transmitted using induction rather than radio signals, and although Stubblefield predicted that his system would be perfected so that "it will be possible to communicate with hundreds of homes at the same time", and "a single message can be sent from

6956-539: A space where individuals are oppressed and alienated to a form of spatial segregation. One of the main objectives of the plan was to allow the free flow of automobile traffic, the plan included lanes of traffic in a north–south direction (seven for each direction) for the Monumental Axis and three arterials (the W3, the Eixo and the L2) for the residential Axis; the cul-de-sac access roads of

7144-666: A strong history of public broadcasting in South America. Inaugurated in 1963, Televisión Nacional Uruguay (TNU) is now linked to the Ministry of Education and Culture of the country. In addition, the Radiodifusión Nacional de Uruguay is a network of radios with 20 different stations in AM and FM that cover the entire country. Since 1998, the Venezuelan state had only one television channel Venezolana de Televisión , and after 2002

7332-461: A widespread audience — dates back to the founding period of radio development, even though the earliest radio transmissions, originally known as "Hertzian radiation" and "wireless telegraphy", used spark-gap transmitters that could only transmit the dots-and-dashes of Morse code . In October 1898 a London publication, The Electrician , noted that "there are rare cases where, as Dr. [Oliver] Lodge once expressed it, it might be advantageous to 'shout'

7520-405: Is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands. The earliest experimental AM transmissions began in the early 1900s. However, widespread AM broadcasting

7708-675: Is India's public broadcaster. It is an autonomous corporation of the Ministry of Information and Broadcasting (India) , Government of India and comprises the Doordarshan television network ( DD National , DD India , DD News , DD Retro ) and All India Radio . Prasar Bharati was established on 23 November 1997, following a demand that the government owned broadcasters in India should be given autonomy like those in many other countries. The Parliament of India passed an Act to grant this autonomy in 1990, but it

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7896-570: Is a unique example of modernism both as a guideline for architectural design but also as a principle for organizing society. Modernism in Brasilia is explored in James Holston's book, The Modernist City . Juscelino Kubitschek , president of Brazil from 1956 to 1961, ordered Brasilia's construction, fulfilling the promise of the Constitution and his own political campaign promise. Building Brasilia

8084-533: Is an important economic center. In 2018, it has the third highest GDP of cities in Brazil, R$ 254 billion reais, representing 3.6% of the total Brazilian GDP. Most economic activity in the federal capital results from its administrative function. Its industrial planning is studied carefully by the Government of the Federal District. Being a city registered by UNESCO , the government in Brasilia has opted to encourage

8272-462: Is argued to exist when the benefits to viewers are relatively high in comparison to the benefits to advertisers from contacting viewers. This frequently is the case in undeveloped countries that normally have low benefits to advertising. An alternative funding model proposed by Michael Slaby is to give every citizen credits they can use to pay qualified media sources for civic information and reporting. Additionally, public broadcasting may facilitate

8460-578: Is becoming increasingly common for them to adopt the format and branding of a local news channel. Canada also has a large number of campus radio and community radio stations. Colombia had between 1955 and 1998 a public television system very similar to that adopted by the NPO in the Netherlands, where private television producers called " programadoras " were given hours on the country's two public television channels ( Cadena Uno and Canal A ). In 1998, when

8648-406: Is comparable to or better in audio quality than a standard analog broadcast". Despite the various actions, AM band audiences continued to contract, and the number of stations began to slowly decline. A 2009 FCC review reported that "The story of AM radio over the last 50 years has been a transition from being the dominant form of audio entertainment for all age groups to being almost non-existent to

8836-665: Is constituted, but Brazil does not have any territories. Therefore, the Court of Justice of the Federal District and of the Territories only serves the Federal District. Part of the budget of the Federal District Government comes from the Constitutional Fund of the Federal District. In 2012, the fund totaled 9.6 billion reais. By 2015, the forecast is 12.4 billion reais, of which more than half (6.4 billion)

9024-497: Is largely arbitrary. Listed below are some of the early AM radio broadcasts, which, due to their irregular schedules and limited purposes, can be classified as "experimental": People who weren't around in the Twenties when radio exploded can't know what it meant, this milestone for mankind. Suddenly, with radio, there was instant human communication. No longer were our homes isolated and lonely and silent. The world came into our homes for

9212-491: Is located, has a GDP of R$ 133,4 billion (about US$ 64.1 billion), about the same as Belarus according to The Economist . Its share of the total Brazilian GDP is about 3.8%. The Federal District has the largest GDP per capita income of Brazil US$ 25,062, slightly higher than Belarus. The city's planned design included specific areas for almost everything, including accommodation , Hotels Sectors North and South. New hotel facilities are being developed elsewhere, such as

9400-419: Is often used as a synonym for the Federal District as a whole, which is divided into 35 administrative regions , one of which (Plano Piloto) includes the area of the originally planned city and its federal government buildings. The entire Federal District is considered by IBGE to make up Brasília's city area, and the local government considers the entirety of the district plus 12 neighboring municipalities in

9588-763: Is owned and operated by the National Politechnical Institute . It started transmissions on 2 March 1959 as the first public broadcasting television in Mexico. The government of Mexico implemented Telesecundaria in 1968 to provide secondary education to students in rural areas through broadcast television channels, such as XHGC-TV in Mexico City. With the launching of the Morelos II satellite, Telesecundaria began transmitting on one of its analog channels in 1988; in 1994, it began broadcasting in digital format with

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9776-867: Is part of the university and cultural diffusion. Canal Catorce was founded in 2012 and is operated by the Sistema Público de Radiodifusión del Estado Mexicano (SPR), an agency from the Federal Government. In the United States , public broadcasters may receive some funding from both federal and state sources, but generally most of their financial support comes from underwriting by foundations and businesses (ranging from small shops to corporations), along with audience contributions via pledge drives . The great majority operate as private not-for-profit corporations . Early public stations were operated by state colleges and universities and were often run as part of

9964-468: Is represented by the Legislative Chamber of the Federal District , whose nomenclature includes a mixture of legislative assembly (legislative power of the other units of the federation) and of municipal chamber (legislative of the municipalities). The Legislative Chamber is made up of 24 district deputies. The judicial power which serves the Federal District also serves federal territories as it

10152-512: Is spent on public security spending. Brasilia is twinned with: Of these, Abuja and Washington, D.C. were also cities specifically planned as the seat of government of their respective countries. Brasília is associated with several significant declarations in the international political and social field, including: The major roles of construction and of services (government, communications, banking and finance, food production, entertainment, and legal services) in Brasilia's economy reflect

10340-591: Is the NHK (Japan Broadcasting Corporation). The broadcaster was set up in 1926 and was modelled on the British Broadcasting Company , the precursor to the British Broadcasting Corporation created in 1927. Much like the BBC, NHK is funded by a "receiving fee" from every Japanese household, with no commercial advertising and the maintenance of a position of strict political impartiality. However, rampant non-payment by

10528-514: Is the federal capital of Brazil and seat of government of the Federal District , located in the Brazilian highlands in the country's Central-West region. It was founded by President Juscelino Kubitschek on 21 April 1960, to replace Rio de Janeiro as the national capital. Brasília is Brazil's third-most populous city after São Paulo and Rio de Janeiro. Among major Latin American cities, it has

10716-574: Is the public service channel of Ecuador, established in October 2007. The channel was established at the same time as the installation of the Ecuadorian Constituent Assembly so that the sessions could be transmitted live to all the country. Salvadoran broadcasting has a public service radio and television channel. On 1 March 1926 began the operation as the first Central American broadcasting network called "Radio Nacional de El Salvador" with

10904-414: The 2013 FIFA Confederations Cup . Laid out in the shape of an airplane, its "fuselage" is the Monumental Axis, a pair of wide avenues flanking a large park. In the "cockpit" is Praça dos Três Poderes, named for the 3 branches of government surrounding it. Brasília has a unique legal status, as it is an administrative region rather than a municipality like other cities in Brazil . The name "Brasília"

11092-553: The Bolivarian Revolution . The Bengali primary state television broadcaster is Bangladesh Television which also broadcasts worldwide through its satellite based branch, BTV World . There are also terrestrial state run TV channels: Sangsad TV owned and operated by Bengali parliament that covers the proceedings of the Parliament. The Bangladesh Betar (BB) is the country's sole state radio broadcaster. Radio transmission in

11280-556: The Electronic Industries Association (EIA) and the National Association of Broadcasters (NAB) with the intention of helping AM stations, especially ones with musical formats, become more competitive with FM broadcasters by promoting better quality receivers. However, the stereo AM and AMAX initiatives had little impact, and a 2015 review of these events concluded that Initially the consumer manufacturers made

11468-657: The Emergency Alert System (EAS). Some automakers have been eliminating AM radio from their electric vehicles (EVs) due to interference from the electric motors , but the lawmakers argue that this is a safety risk and that car owners should have access to AM radio regardless of the type of vehicle they drive. The proposed legislation would require all new vehicles to include AM radio at no additional charge, and it would also require automakers that have already eliminated AM radio to inform customers of alternatives. A proper solution would be to switch to DRM30 as indicated in

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11656-787: The FM band was authorized to begin normal broadcasting. Houston 's KUHT was the nation's first public television station founded by Dr. John W. Meaney, and signed on the air on May 25, 1953, from the campus of the University of Houston . In rural areas, it was not uncommon for colleges to operate commercial stations instead (e.g., the University of Missouri 's KOMU , an NBC -affiliated television station in Columbia ). The FCC had reserved almost 250 broadcast frequencies for use as educational television stations in 1953, though by 1960, only 44 stations allocated for educational use had begun operations. The passage of

11844-408: The Federal District had surpassed 2,5 million. The city of Brasilia proper, the plano piloto was planned for about 500,000 inhabitants, a figure the plano piloto never surpassed, with a current population of only 214,529, but its metropolitan area within the Federal District has grown past this figure. From the beginning, the growth of Brasilia was greater than original estimates. According to

12032-479: The Federal Emergency Management Agency (FEMA) expressed concerns that this would reduce the effectiveness of emergency communications. In May 2023, a bipartisan group of lawmakers in the United States introduced legislation making it illegal for automakers to eliminate AM radio from their cars. The lawmakers argue that AM radio is an important tool for public safety due to being a component of

12220-612: The Pontifical Catholic University of Valparaíso on channels 8 and 4. Channel 8, in Valparaíso , is the first and oldest station on Chile, transmitting since 5 October 1957. As soon as 1961 universities began transmitting advertisements between their programmes, the first of them being the Channel ;9, showing a Motorola TV set. This kind of disguised advertising took the name of "Payola". This situation, added to

12408-547: The Public Broadcasting Act of 1967 precipitated the development of the current public broadcasting system in the U.S. The legislation established the Corporation for Public Broadcasting (CPB), a private entity that is charged with facilitating programming diversity among public broadcasters, the development and expansion of non-commercial broadcasting, and providing funding to local stations to help them create programs;

12596-545: The Salesian order, are found throughout the city and one church parish in the city bears his name. Juscelino Kubitschek was elected President of Brazil in 1955. Upon taking office in January 1956, in fulfilment of his campaign pledge, he initiated the planning and construction of the new capital. The following year an international jury selected Lúcio Costa 's plan to guide the construction of Brazil's new capital, Brasilia. Costa

12784-431: The electrolytic detector and thermionic diode ( Fleming valve ) were invented by Reginald Fessenden and John Ambrose Fleming , respectively. Most important, in 1904–1906 the crystal detector , the simplest and cheapest AM detector, was developed by G. W. Pickard . Homemade crystal radios spread rapidly during the next 15 years, providing ready audiences for the first radio broadcasts. One limitation of crystals sets

12972-431: The presidential election in 2018 that the public broadcaster is allegedly a "job hanger" (public company existing only for the purpose of securing positions for political allies) and has proposed to privatize or extinguish the public company. On April 9, 2021, the president inserted the public company into the National Privatization Program, with the intention of carrying out studies about the possibility of privatization of

13160-458: The rainy season , from October to April, and the dry season , from May to September. The average temperature is 21.4 °C (70.5 °F). September, at the end of the dry season, has the highest average maximum temperature, 29.1 °C (84.4 °F), and July has major and minor lower maximum average temperature, of 25.6 °C (78.1 °F) and 13.9 °C (57.0 °F), respectively. Average temperatures from September through March are

13348-430: The " capture effect " means that the dominant signal needs to only be about twice as strong as the interfering one. To allow room for more stations on the mediumwave broadcast band in the United States, in June 1989 the FCC adopted a National Radio Systems Committee (NRSC) standard that limited maximum transmitted audio bandwidth to 10.2 kHz, limiting occupied bandwidth to 20.4 kHz. The former audio limitation

13536-587: The 1930s, most of the major radio stations in the country were affiliated with networks owned by two companies, NBC and CBS . In 1934, a third national network, the Mutual Radio Network , was formed as a cooperative owned by its stations. A second country which quickly adopted network programming was the United Kingdom, and its national network quickly became a prototype for a state-managed monopoly of broadcasting. A rising interest in radio broadcasting by

13724-660: The 1940s two new broadcast media, FM radio and television , began to provide extensive competition with the established broadcasting services. The AM radio industry suffered a serious loss of audience and advertising revenue, and coped by developing new strategies. Network broadcasting gave way to format broadcasting: instead of broadcasting the same programs all over the country, stations individually adopted specialized formats which appealed to different audiences, such as regional and local news, sports, "talk" programs, and programs targeted at minorities. Instead of live music, most stations began playing less expensive recorded music. In

13912-528: The AM radio industry in the United States developed technology for broadcasting in stereo . Other nations adopted AM stereo, most commonly choosing Motorola's C-QUAM, and in 1993 the United States also made the C-QUAM system its standard, after a period allowing four different standards to compete. The selection of a single standard improved acceptance of AM stereo , however overall there was limited adoption of AM stereo worldwide, and interest declined after 1990. With

14100-555: The Advancement of New Language Applications Ltd.'), a private not-for-profit consortium of educational institutions in the province of Quebec. Some local community stations also operate non-commercially with funding from corporate and individual donors. In addition, cable companies are required to produce a local community channel in each licensed market. Such channels have traditionally aired community talk shows, city council meetings and other locally oriented programming, although it

14288-521: The British public pressured the government to reintroduce the service, following its suspension in 1920. However, the government also wanted to avoid what it termed the "chaotic" U.S. experience of allowing large numbers of stations to operate with few restrictions. There were also concerns about broadcasting becoming dominated by the Marconi company. Arrangements were made for six large radio manufacturers to form

14476-579: The CPB receives funding earmarked by the federal government as well as through public and private donations. Public television and radio in the U.S. have, from the late 1960s onward, dealt with severe criticism from conservative politicians and think-tanks (such as The Heritage Foundation ), which allege that its programming has a leftist bias and there have been successful attempts to reduce – though not eliminate – funding for public television stations by some state legislatures. The first public radio network in

14664-636: The CRBC's nine radio stations (which were largely concentrated in major cities across Canada, including Toronto , Vancouver , Montreal , and Ottawa ). The CBC eventually expanded to television in September 1952 with the sign-on of CBFT in Montreal; CBFT was the first television station in Canada to initiate full-time broadcasts, which initially served as a primary affiliate of the French language Télévision de Radio-Canada and

14852-465: The Colombian government allowed the opening of television to the private market by granting two broadcast licenses to the programadoras Caracol Televisión and RCN Televisión , these television producers went into crisis, causing many to end their activities or produce content for the private television channels. Currently, Colombia has three public channels (one is operated by a private company formed by

15040-560: The Embassy Sector. Brasília was inscribed as a UNESCO World Heritage Site in 1987 due to its modernist architecture and uniquely artistic urban planning . It was named "City of Design" by UNESCO in October 2017 and has been part of the Creative Cities Network since then. It is notable for its white-colored, modern architecture, designed by Oscar Niemeyer. All three branches of Brazil's federal government are located in

15228-549: The French-language channels Ici Explora and Ici ARTV , dedicated to science and culture respectively. CBC's national television operations and some radio operations are funded partly by advertisements, in addition to the subsidy provided by the federal government. The cable channels are commercial entities owned and operated by the CBC and do not receive any direct public funds, however, they do benefit from synergies with resources from

15416-530: The Monumental axis provide loops and exits for cars to enter small roads. Some argue that his emphasis of the plan on automobiles caused the lengthening of distances between centers and it attended only the necessities of a small segment of the population who owned cars. But one can not ignore the bus transportation system in the city. The buses routes inside the city operate heavily on W3 and L2. Almost anywhere, including satellite cities, can be reached just by taking

15604-586: The Public Radio Satellite System. Cultural Native American and Mexican American music and programming are also featured regionally. NPR is colloquially though inaccurately conflated with public radio as a whole, when in fact "public radio" includes many organizations. 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

15792-463: The Secretariat of Communication of the state government. Brazil also has many campus radio and community radio stations and several educational local TV channels (many of them belonging to public and private universities). In Canada, the main public broadcaster is the national Canadian Broadcasting Corporation (CBC; French : Société Radio-Canada ), a crown corporation – which originated as

15980-411: The Twenties when radio exploded can't know what it meant, this milestone for mankind. Suddenly, with radio, there was instant human communication. No longer were our homes isolated and lonely and silent. The world came into our homes for the first time. Music came pouring in. Laughter came in. News came in. The world shrank, with radio. The idea of broadcasting — the unrestricted transmission of signals to

16168-662: The United States and France this led to a small market of receiver lines geared for jewelers who needed accurate time to set their clocks, including the Ondophone in France, and the De Forest RS-100 Jewelers Time Receiver in the United States The ability to pick up time signal broadcasts, in addition to Morse code weather reports and news summaries, also attracted the interest of amateur radio enthusiasts. It

16356-450: The United States was founded in 1949 in Berkeley, California, as station KPFA , which became and remains the flagship station for a national network called Pacifica Radio . From the beginning, the network has refused corporate funding of any kind, and has relied mainly on listener support. KPFA gave away free FM radios to build a listener base and to encourage listeners to "subscribe" (support

16544-668: The advent of the Solidaridad I satellite, and Edusat was established and began transmitting in Mexico, Central America and certain regions of the United States. In 1982, Canal 22 was founded and began operations eleven years later by the Ministry of Culture as part of the "RED México". In 2005 the National Autonomous University of Mexico (UNAM in Spanish) began transmissions as the sister channel of XEUN-AM and XEUN-FM (both radio stations founded in 1959), TV UNAM which

16732-454: The amusement center. One of the main features of Costa's plan was that he presented a new city with its future shape and patterns evident from the beginning. This meant that the original plan included paving streets that were not immediately put into use; the advantage of this was that the original plan is hard to undo because he provided for an entire street network, but on the other hand, is difficult to adapt and mold to other circumstances in

16920-523: The antenna wire. This meant that the full transmitter power flowed through the microphone, and even using water cooling, the power handling ability of the microphones severely limited the power of the transmissions. Ultimately only a small number of large and powerful Alexanderson alternators would be developed. However, they would be almost exclusively used for long-range radiotelegraph communication, and occasionally for radiotelephone experimentation, but were never used for general broadcasting. Almost all of

17108-411: The architect first employed. Additionally, the metro system in Brasilia was mainly built for inhabitants of satellite cities. Though this growth has made Brasilia no longer a pure utopia with incomparable modernity, the later development of traffic management, bus routes to satellite cities, and the metro system all serve as a remedy to the dystopia, enabling the citizens to enjoy the kind of modernity that

17296-474: The audience has continued to decline. In 1987, the elimination of the Fairness Doctrine requirement meant that talk shows, which were commonly carried by AM stations, could adopt a more focused presentation on controversial topics, without the distraction of having to provide airtime for any contrasting opinions. In addition, satellite distribution made it possible for programs to be economically carried on

17484-457: The blocks were intended to appear absorbed by the landscape because they were isolated by a belt of tall trees and lower vegetation. Costa attempted to introduce a Brazil that was more equitable, he also designed housing for the working classes that was separated from the upper- and middle-class housing and was visually different, with the intention of avoiding slums ( favelas ) in the urban periphery. The superquadra has been accused of being

17672-616: The broadcaster. While many members have significant editorial independence, the Alliance includes organizations that have significant state control, especially with regard to island nations. In Brazil, the two main national public broadcasters are Empresa Brasil de Comunicação (EBC) and the Fundação Padre Anchieta (FPA). EBC was created in 2007 to manage the Brazilian federal government's radio and television stations. EBC owns broadcast

17860-525: The bus and most of the Plano Piloto can be reached without transferring to other buses. Later, as the population of the city increased, the transportation system also played an important role in mediating the relationship between the Pilot plan and the satellite cities. Due to the larger influx of vehicles, traffic lights were introduced to the Monumental Axis, which violates the concept of modernity and advancement

18048-537: The channel to Rogers Media in 2012, expanding a relationship it began with SCN in January of that year, when Rogers began supplying entertainment programming to the channel through an affiliation agreement with its English-language broadcast network, Citytv . One television station, CFTU in Montreal , operates as an educational station owned by CANAL ( French : Corporation pour l'Avancement de Nouvelles Applications des Langages Ltée , lit.   'Corporation for

18236-563: The channel was sold to CHUM Limited in 1995, which initially acquired the channel through a majority-owned subsidiary, Learning and Skills Television of Alberta Limited (LSTA). To fulfill its license conditions as an educational station, it broadcasts educational and children's programming during the daytime hours, while airing entertainment programming favoured by advertisers and viewers in prime time. The service discontinued its broadcast transmitters in Calgary and Edmonton in August 2011, due to

18424-404: The characteristics of arc-transmitters . Fessenden attempted to sell this form of radiotelephone for point-to-point communication, but was unsuccessful. Fessenden's work with high-frequency spark transmissions was only a temporary measure. His ultimate plan for creating an audio-capable transmitter was to redesign an electrical alternator , which normally produced alternating current of at most

18612-501: The children's TV channel TV Rá-Tim-Bum , available nationally on pay TV. Many Brazilian states also have regional and statewide public radio and television stations. One example is Minas Gerais , which has the EMC ( Empresa Mineira de Comunicação ), a public corporation created in 2016 modelled on EBC, formed by Rede Minas , a statewide television network and the two stations of Rádio Inconfidência , which operates in AM, FM and shortwave ; in

18800-516: The city include construction (Paulo Octavio, Via Construções, and Irmãos Gravia among others); food processing (Perdigão, Sadia); furniture making; recycling (Novo Rio, Rexam , Latasa and others); pharmaceuticals (União Química); and graphic industries. The main agricultural products produced in the city are coffee , guavas , strawberries , oranges , lemons , papayas , soybeans , and mangoes . It has over 110,000 cows and it exports wood products worldwide. The Federal District , where Brasilia

18988-489: The city's status as a governmental rather than an industrial center. Industries connected with construction, food processing, and furnishings are important, as are those associated with publishing, printing, and computer software. The gross domestic product (GDP) is divided in Public Administration 54.8%, Services 28.7%, Industry 10.2%, Commerce 6.1%, Agrobusiness 0.2%. Besides being the political center, Brasilia

19176-422: The city: executive , legislative and judiciary . Brasília also hosts 124 foreign embassies . The city's international airport connects it to all other major Brazilian cities and some international destinations, and it is the third-busiest airport in Brazil . It was one of the main host cities of the 2014 FIFA World Cup and hosted some of the football matches during the 2016 Summer Olympics ; it also hosted

19364-403: The commission estimated that fewer than 250 AM stations were transmitting hybrid mode signals. On October 27, 2020, the FCC voted to allow AM stations to eliminate their analog transmissions and convert to all-digital operation, with the requirement that stations making the change had to continue to make programming available over "at least one free over-the-air digital programming stream that

19552-475: The continued migration of AM stations away from music to news, sports, and talk formats, receiver manufacturers saw little reason to adopt the more expensive stereo tuners, and thus radio stations have little incentive to upgrade to stereo transmission. In countries where the use of directional antennas is common, such as the United States, transmitter sites consisting of multiple towers often occupy large tracts of land that have significantly increased in value over

19740-437: The continuous wave AM transmissions made prior to 1915 were made by versions of the arc converter transmitter, which had been initially developed by Valdemar Poulsen in 1903. Arc transmitters worked by producing a pulsating electrical arc in an enclosed hydrogen atmosphere. They were much more compact than alternator transmitters, and could operate on somewhat higher transmitting frequencies. However, they suffered from some of

19928-556: The corporation decommissioning its network of rebroadcasters following Canada's transition to digital television in August 2011 have significantly reduced the terrestrial coverage of both CBC Television and Ici Radio-Canada Télé; the Canadian Radio-television and Telecommunications Commission (CRTC) does require cable, satellite and IPTV providers to carry CBC and Radio-Canada stations as part of their basic tier, regardless of terrestrial availability in an individual market. Of

20116-473: The country's population was concentrated near its Atlantic coast. Brasilia's geographically central location fostered a more regionally neutral federal capital. An article of the country's first republican constitution , dated 1891, states that the capital should be moved from Rio de Janeiro to a place close to the country's center. The idea of relocating Brazil's capital city was conceived in 1827 by José Bonifácio , an advisor to Emperor Pedro I . He presented

20304-434: The decades, to the point that the value of land exceeds that of the station itself. This sometimes results in the sale of the transmitter site, with the station relocating to a more distant shared site using significantly less power, or completely shutting down operations. The ongoing development of alternative transmission systems, including Digital Audio Broadcasting (DAB), satellite radio, and HD (digital) radio, continued

20492-567: The decline of the popularity of the traditional broadcast technologies. These new options, including the introduction of Internet streaming, particularly resulted in the reduction of shortwave transmissions, as international broadcasters found ways to reach their audiences more easily. In 2022 it was reported that AM radio was being removed from a number of electric vehicle (EV) models, including from cars manufactured by Tesla, Audi, Porsche, BMW and Volvo, reportedly due to automakers concerns that an EV's higher electromagnetic interference can disrupt

20680-569: The demonstration witnesses, which stated "[Radio] Telephony is admirably adapted for transmitting news, stock quotations, music, race reports, etc. simultaneously over a city, on account of the fact that no wires are needed and a single apparatus can distribute to ten thousand subscribers as easily as to a few. It is proposed to erect stations for this purpose in the large cities here and abroad." However, other than two holiday transmissions reportedly made shortly after these demonstrations, Fessenden does not appear to have conducted any radio broadcasts for

20868-481: The development of non-polluting industries such as software, film, video, and gemology among others, with emphasis on environmental preservation and maintaining ecological balance, preserving the city property. According to Mercer 's city rankings of cost of living for expatriate employees , Brasilia ranks 45th among the most expensive cities in the world in 2012, up from the 70th position in 2010, ranking behind São Paulo (12th) and Rio de Janeiro (13th). Industries in

21056-687: The diagram above. AM radio technology is simpler than later transmission systems. An AM receiver detects amplitude variations in the radio waves at a particular frequency, then amplifies changes in the signal voltage to operate a loudspeaker or earphone . However, the simplicity of AM transmission also makes it vulnerable to "static" ( radio noise , radio frequency interference ) created by both natural atmospheric electrical activity such as lightning, and electrical and electronic equipment, including fluorescent lights, motors and vehicle ignition systems. In large urban centers, AM radio signals can be severely disrupted by metal structures and tall buildings. As

21244-645: The expectation is that listeners will primarily be tuning into the FM signal rather than the nominally "primary" AM station. A 2020 review noted that "for many owners, keeping their AM stations on the air now is pretty much just about retaining their FM translator footprint rather than keeping the AM on the air on its own merits". In 2018 the FCC, led by then-Commission Chairman Ajit Pai , proposed greatly reducing signal protection for 50 kW Class A " clear channel " stations. This would allow co-channel secondary stations to operate with higher powers, especially at night. However,

21432-466: The expense of transitioning the two stations to digital , and the fact that the service had mandatory carriage on television providers serving Alberta regardless of whether it ran over-the-air transmitters. The service has since operated as part of Bell Media 's CTV Two chain of stations. Public radio station CKUA in Alberta was also formerly operated by Access, before being sold to the non-profit CKUA Radio Foundation which continues to operate it as

21620-533: The fact that TV was only reaching Santiago and Valparaíso , led to the creation of a state network that should serve the entire country. This network, created in 1964 and in operation since 24 October 1969, is known as " Televisión Nacional de Chile ". After the military government of Augusto Pinochet , television was mostly deregulated. Thus, two new commercial channels were born: Megavisión (Channel 9, on 23 October 1990) and La Red (Channel 4, on 12 May 1991). The University of Chile's Channel 11 also

21808-445: The fall of 1900, he successfully transmitted speech over a distance of about 1.6 kilometers (one mile), which appears to have been the first successful audio transmission using radio signals. However, at this time the sound was far too distorted to be commercially practical. For a time he continued working with more sophisticated high-frequency spark transmitters, including versions that used compressed air, which began to take on some of

21996-401: The first time. Music came pouring in. Laughter came in. News came in. The world shrank, with radio. Following World War I, the number of stations providing a regular broadcasting service greatly increased, primarily due to advances in vacuum-tube technology. In response to ongoing activities, government regulators eventually codified standards for which stations could make broadcasts intended for

22184-579: 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 alienated many of the network's affiliates. PBS would later acquire Educational Television Stations , an organization founded by the National Association of Educational Broadcasters (NAEB), in 1973. Uruguay has

22372-421: The future. In addition, there has been controversy with the monumental aspect of Lúcio Costa's Plan, because it appeared to some as 19th century city planning, not modern 20th century in urbanism. An interesting analysis can be made of Brasilia within the context of Cold War politics and the association of Lúcio Costa's plan to the symbolism of aviation. From an architectural perspective, the airplane-shaped plan

22560-620: The general public, for example, in the United States formal recognition of a "broadcasting service" came with the establishment of regulations effective December 1, 1921, and Canadian authorities created a separate category of "radio-telephone broadcasting stations" in April 1922. However, there were numerous cases of entertainment broadcasts being presented on a regular schedule before their formal recognition by government regulators. Some early examples include: Because most longwave radio frequencies were used for international radiotelegraph communication,

22748-417: The general public, or to have even given additional thought about the potential of a regular broadcast service, and in a 1908 article providing a comprehensive review of the potential uses for his radiotelephone invention, he made no references to broadcasting. Because there was no way to amplify electrical currents at this time, modulation was usually accomplished by a carbon microphone inserted directly in

22936-487: The government decided to launch the channel ViVe (2003), teleSUR (2005), TVES (2007) (a signal that until that year was occupied by RCTV ) and Asamblea Nacional Televisión in addition to supporting and financing a network of community channels as well as Ávila Television belonging to the Metropolitan Mayor's Office of Caracas. United States politicians have commented that TeleSUR is a propaganda tool in favor of

23124-402: The growth of a capital city. Even though the initial plan was transformed over time, it oriented much of the construction and most of its features survived. Brasilia's accession as the new capital and its designation for the development of an extensive interior region inspired the symbolism of the plan. Costa used a cross-axial design indicating the possession and conquest of this new place with

23312-527: The highest GDP per capita . Brasília is a planned city developed by Lúcio Costa , Oscar Niemeyer and Joaquim Cardozo in 1956 in a scheme to move the capital from Rio de Janeiro to a more central location. The landscape architect was Roberto Burle Marx . The city's design divides it into numbered blocks as well as sectors for specified activities, such as the Hotel Sector, the Banking Sector, and

23500-419: The hotels and tourism Sector North, located on the shores of Lake Paranoá . As a venue for political events, music performances and movie festivals, Brasilia is a cosmopolitan city, with around 124 embassies , a wide range of restaurants and a complete infrastructure ready to host any kind of event. Not surprisingly, the city stands out as an important business/tourism destination, which is an important part of

23688-604: The idea of Monumentality. This axis includes the various ministries, national congress, presidential palace, supreme court building and the television and radio tower. The Residential Axis was intended to contain areas with intimate character and is considered the most important achievement of the plan; it was designed for housing and associated functions such as local commerce, schooling, recreation and churches, constituted of 96 superblocks  [ pt ] limited to six-story buildings and 12 additional superblocks limited to three-story buildings; Costa's intention with superblocks

23876-511: The implementation of a cultural policy (an industrial policy and investment policy for culture). Examples include: As an industry organization for public media, the Public Media Alliance supports its members and the industry of public media more broadly. For example, the Alliance advocated against a proposal on the Isle of Man that they felt would jeopardize the editorial independence of

24064-541: The isolation of rural life. Political officials could now speak directly to millions of citizens. One of the first to take advantage of this was American president Franklin Roosevelt , who became famous for his fireside chats during the Great Depression . However, broadcasting also provided the means to use propaganda as a powerful government tool, and contributed to the rise of fascist and communist ideologies. In

24252-411: The lack of any way to amplify the signals meant they were somewhat weak. On December 21, 1906, Fessenden made an extensive demonstration of the new alternator-transmitter at Brant Rock, Massachusetts, showing its utility for point-to-point wireless telephony, including interconnecting his stations to the wire telephone network. As part of the demonstration, speech was transmitted 18 kilometers (11 miles) to

24440-419: The late 1960s and 1970s, top 40 rock and roll stations in the U.S. and Canada such as WABC and CHUM transmitted highly processed and extended audio to 11 kHz, successfully attracting huge audiences. For young people, listening to AM broadcasts and participating in their music surveys and contests was the social media of the time. In the late 1970s, spurred by the exodus of musical programming to FM stations,

24628-461: The legislative powers reserved to the states and municipalities, as provided in Article 32, § 1º of the Constitution, which gives it a hybrid nature, both state and municipal. The executive power of the Federal District was represented by the mayor of the Federal District until 1969, when the position was transformed into governor of the Federal District. The legislative power of the Federal District

24816-519: The local economy, with dozens of hotels spread around the federal capital. Traditional parties take place throughout the year. In June, large festivals known as " festas juninas " are held celebrating Catholic saints such as Saint Anthony of Padua , Saint John the Baptist , and Saint Peter . On 7 September, the traditional Independence Day parade is held on the Ministries Esplanade. Throughout

25004-399: The marketplace decide" which was best. The lack of a common standard resulted in consumer confusion and increased the complexity and cost of producing AM stereo receivers. In 1993, the FCC again revised its policy, by selecting C-QUAM as the sole AM stereo implementation. In 1993, the FCC also endorsed, although it did not make mandatory, AMAX broadcasting standards that were developed by

25192-432: The message, spreading it broadcast to receivers in all directions". However, it was recognized that this would involve significant financial issues, as that same year The Electrician also commented "did not Prof. Lodge forget that no one wants to pay for shouting to the world on a system by which it would be impossible to prevent non-subscribers from benefiting gratuitously?" On January 1, 1902, Nathan Stubblefield gave

25380-448: The multiple incompatible AM stereo systems, and failure of the manufacturers (including the auto makers) to effectively promote AMAX radios, coupled with the ever-increasing background of noise in the band, the general public soon lost interest and moved on to other media. On June 8, 1988, an International Telecommunication Union (ITU)-sponsored conference held at Rio de Janeiro, Brazil adopted provisions, effective July 1, 1990, to extend

25568-537: The necessity of having to transmit a high power carrier wave to overcome ground losses, and the large antenna radiators required at the low broadcast frequencies, but can be sent over long distances via the ionosphere at night; however, they are much more susceptible to interference, and often have lower audio fidelity. Thus, AM broadcasters tend to specialize in spoken-word formats, such as talk radio , all-news radio and sports radio , with music formats primarily for FM and digital stations. People who weren't around in

25756-723: The network has moved its programming to stations opened by the corporation or has purchased certain affiliates from private broadcasting groups; budgetary issues led the CBC to choose not to launch new rebroadcast transmitters in markets where the network disaffiliated from a private station after 2006; the network dropped its remaining private affiliates in 2016, when CJDC-TV — Dawson Creek and CFTK-TV — Terrace, British Columbia defected from CBC Television that February and Lloydminster -based CKSA-DT disaffiliated in August of that year (to become affiliates of CTV Two and Global , respectively). The CBC's decision to disaffiliate from these and other privately owned stations, as well as

25944-405: The new frequencies. It was now estimated that the expanded band could accommodate around 300 U.S. stations. However, it turned out that the number of possible station reassignments was much lower, with a 2006 accounting reporting that, out of 4,758 licensed U.S. AM stations, only 56 were now operating on the expanded band. Moreover, despite an initial requirement that by the end of five years either

26132-428: The new policy, by 2011 there were approximately 500 in operation, and as of 2020 approximately 2,800 of the 4,570 licensed AM stations were rebroadcasting on one or more FM translators. In 2009 the FCC stated that "We do not intend to allow these cross-service translators to be used as surrogates for FM stations". However, based on station slogans, especially in the case of recently adopted musical formats, in most cases

26320-461: The online radio service CBC Radio 3 , music streaming service CBC Music , and the launch of online news services, such as CBC Hamilton , in some markets which are not directly served by their own CBC television or radio stations. In addition, several provinces operate public broadcasters; these are not CBC subentities, but distinct networks in their own right. Most of the provincial services maintain an educational programming format, differing from

26508-541: The original plans, Brasilia would be a city for government authorities and staff. However, during its construction, Brazilians from all over the country migrated to the satellite cities of Brasilia, seeking public and private employment. At the close of the 20th century, Brasilia was the largest city in the world which had not existed at the beginning of the century. Brasilia has one of the highest population growth rates in Brazil, with annual growth of 2.82%, mostly due to internal migration . Brasilia's inhabitants include

26696-411: The original station or its expanded band counterpart had to cease broadcasting, as of 2015 there were 25 cases where the original standard band station was still on the air, despite also operating as an expanded band station. HD Radio is a digital audio broadcasting method developed by iBiquity . In 2002 its "hybrid mode", which simultaneously transmits a standard analog signal as well as a digital one,

26884-411: The other CBC operations. The CBC has frequently dealt with budget cuts and labour disputes, often resulting in a debate about whether the service has the resources necessary to properly fulfill its mandate. As of 2017, all of CBC Television's terrestrial stations are owned and operated by the CBC directly. The number of privately owned CBC Television affiliates has gradually declined in recent years, as

27072-433: The overheating issues of needing to insert microphones directly in the transmission antenna circuit. Vacuum tube transmitters also provided high-quality AM signals, and could operate on higher transmitting frequencies than alternator and arc transmitters. Non-governmental radio transmissions were prohibited in many countries during World War I, but AM radiotelephony technology advanced greatly due to wartime research, and after

27260-470: The population of the Amazon region, and Agência Brasil , a news agency. Starting in 2021, EBC expanded the coverage of its radio stations through the new FM extended band to the metropolitan areas of São Paulo, Belo Horizonte and Recife, important Brazilian regions which did not have EBC radio stations. FPA is a non-profit foundation created by the government of the state of São Paulo in 1967 and includes

27448-410: The primarily entertainment-based CBC/Radio-Canada operations, but more closely formatted to (and carrying many of the same programs as) the U.S.-based Public Broadcasting Service (PBS), which itself is available terrestrially and – under a CRTC rule that requires Canadian cable, satellite and IPTV providers to carry affiliates of the four major U.S. commercial networks ( ABC , NBC , CBS and Fox ) and

27636-441: The primary early developer of AM technology is Canadian-born inventor Reginald Fessenden . The original spark-gap radio transmitters were impractical for transmitting audio, since they produced discontinuous pulses known as " damped waves ". Fessenden realized that what was needed was a new type of radio transmitter that produced steady "undamped" (better known as " continuous wave ") signals, which could then be "modulated" to reflect

27824-521: The public broadcaster. Some states often had problems with their public broadcasting services. In São Paulo, FPA had sometimes dealt with budget cuts, labor disputes and strikes. In Rio Grande do Sul, TVE-RS and FM Cultura were managed by the Piratini Foundation, a non-profit state foundation. However, due to the public debt crisis in the state, in 2018, the Piratini Foundation had its activities closed, and TVE-RS and FM Cultura started to be managed by

28012-743: The question of individual or public taste. Within public broadcasting there are two different views regarding commercial activity. One is that public broadcasting is incompatible with commercial objectives. The other is that public broadcasting can and should compete in the marketplace with commercial broadcasters. This dichotomy is highlighted by the public service aspects of traditional commercial broadcasters. Public broadcasters in each jurisdiction may or may not be synonymous with government controlled broadcasters. Public broadcasters may receive their funding from an obligatory television licence fee, individual contributions, government funding or commercial sources. Public broadcasters do not rely on advertising to

28200-637: The reception of AM transmissions and hurt the listening experience, among other reasons. However the United States Congress has introduced a bill to require all vehicles sold in the US to have an AM receiver to receive emergency broadcasts. The FM broadcast band was established in 1941 in the United States, and at the time some suggested that the AM band would soon be eliminated. In 1948 wide-band FM's inventor, Edwin H. Armstrong , predicted that "The broadcasters will set up FM stations which will parallel, carry

28388-456: The record high was 36.4 °C (97.5 °F) on 18 October 2015 and 8 October 2020. The highest accumulated rainfall in 24 hours was 132.8 mm (5.2 in) on 15 November 1963. According to the 2022 IBGE Census , 2,817,381 people resided in Brasília and its metropolitan area, of whom 1,370,836 were Mixed (48.7%), 1,126,334 White (40%), 301,765 Black (10.7%), 12,810 Asian (0.5%), and 5,536 Amerindian (0.1%). In 2010, Brasilia

28576-586: The region now forming Bangladesh started in Dhaka on December 16, 1939. The Ministry of Information and Broadcasting (Bangladesh) is responsible for the administration of all government TV channels and Radio. Radio Television Brunei (RTB) is the only public broadcaster in Brunei Darussalam. In Hong Kong, the Radio Television Hong Kong ( RTHK ) is the sole public service broadcaster. Although being

28764-799: The same deficiencies. The lack of any means to amplify electrical currents meant that, like the alternator transmitters, modulation was usually accomplished by a microphone inserted directly in the antenna wire, which again resulted in overheating issues, even with the use of water-cooled microphones. Thus, transmitter powers tended to be limited. The arc was also somewhat unstable, which reduced audio quality. Experimenters who used arc transmitters for their radiotelephone research included Ernst Ruhmer , Quirino Majorana , Charles "Doc" Herrold , and Lee de Forest . Advances in vacuum tube technology (called "valves" in British usage), especially after around 1915, revolutionized radio technology. Vacuum tube devices could be used to amplify electrical currents, which overcame

28952-550: The same degree as commercial broadcasters, or at all; this allows public broadcasters to transmit programmes that are not commercially viable to the mass market , such as public affairs shows, radio and television documentaries , and educational programmes . One of the principles of public broadcasting is to provide coverage of interests for which there are missing or small markets. Public broadcasting attempts to supply topics of social benefit that are otherwise not provided by commercial broadcasters. Typically, such underprovision

29140-400: The same program, as over their AM stations... eventually the day will come, of course, when we will no longer have to build receivers capable of receiving both types of transmission, and then the AM transmitters will disappear." However, FM stations actually struggled for many decades, and it was not until 1978 that FM listenership surpassed that of AM stations. Since then the AM band's share of

29328-463: The schools' cooperative extension services . Stations in this era were internally funded, and did not rely on listener contributions to operate, some accepted advertising. Networks such as Iowa Public Radio , South Dakota Public Radio , and Wisconsin Public Radio began under this structure. The concept of a " non-commercial, educational " station per se did not show up in U.S. law until 1941, when

29516-489: The shares of four former programadoras ) and eight public radio stations (three stations are regional broadcasters). Chilean television was founded through universities, in an attempt to bring public television without the state having to pay directly and control content. The University of Chile (owner of the former channels 9 and 11 until 1993), the Catholic University of Chile on channels 2 and 13 until 2010, and

29704-410: The sounds being transmitted. Fessenden's basic approach was disclosed in U.S. Patent 706,737, which he applied for on May 29, 1901, and was issued the next year. It called for the use of a high-speed alternator (referred to as "an alternating-current dynamo") that generated "pure sine waves" and produced "a continuous train of radiant waves of substantially uniform strength", or, in modern terminology,

29892-486: The state of Goiás to be its metropolitan area . The term Brasília comes from the Latin translation of Brazil, which was suggested as a name for the country's capital in 1821 by José Bonifácio de Andrada e Silva . Brazil's first capital was Salvador ; in 1763 Rio de Janeiro became Brazil's capital and remained so until 1960. During this period, resources tended to be centered in Brazil's southeastern region, and most of

30080-672: The state of Pará , the state-funded foundation FUNTELPA ( Fundação Paraense de Radiodifusão ) operates the public educational state-wide television network Rede Cultura do Pará (which covers the entire state of Pará, reaching many cities of Brazilian Amazon ) and Rádio Cultura, a public radio station which broadcasts in FM for Belém . The state of Espírito Santo has the RTV-ES ( Rádio e Televisão Espírito Santo ), with its television channel TVE-ES ( TV Educativa do Espírito Santo ) and an AM radio station ( Rádio Espírito Santo ), and in Rio Grande do Sul ,

30268-600: The state-wide public television channel TVE-RS ( TV Educativa do Rio Grande do Sul ) and the public radio station FM Cultura (which broadcasts for Porto Alegre metropolitan area) are the two public broadcasters in the state. Regional public television channels in Brazil often broadcast part of TV Brasil or TV Cultura programming among with some hours of local programming. Since the government of Michel Temer , EBC has received several criticism from some politicians for having an alleged political bias. The president of Brazil from 2019 to 2022, Jair Bolsonaro , said in his campaign for

30456-486: The station directly with donations). It is the world's oldest listener-supported radio network. Since the creation of the Corporation for Public Broadcasting, Pacifica has sometimes received CPB support. Pacifica runs other stations in Los Angeles , New York City , Washington, D.C. , and Houston , as well as repeater stations and a large network of affiliates. A national public radio network, National Public Radio (NPR),

30644-417: The superblocks were planned to be the end of the main flow of traffic. And the reason behind the heavy emphasis on automobile traffic is the architect's desire to establish the concept of modernity in every level. Though automobiles were invented prior to the 20th century, mass production of vehicles in the early 20th made them widely available; thus, they became a symbol of modernity. The two small axes around

30832-411: The technology for AM broadcasting in stereo was challenging due to the need to limit the transmissions to a 20 kHz bandwidth, while also making the transmissions backward compatible with existing non-stereo receivers. In 1990, the FCC authorized an AM stereo standard developed by Magnavox, but two years later revised its decision to instead approve four competing implementations, saying it would "let

31020-524: The television channel TV Brasil (launched in 2007, being the merger of TVE Brasil, launched in Rio de Janeiro in 1975, and TV Nacional, launched in Brasilia in 1960), the radio stations Rádio Nacional and Rádio MEC , broadcast to Brasilia , Rio de Janeiro , São Paulo , Belo Horizonte , Recife , and Tabatinga , Rádio Nacional da Amazônia , a shortwave radio station based in Brasília with programming aimed to

31208-428: The three major French-language television networks in Canada, Ici Radio-Canada Télé is the only one that maintains terrestrial owned-and-operated stations and affiliates in all ten Canadian provinces , although it maintains only one station ( Moncton, New Brunswick -based CBAFT-DT ) that serves the four provinces comprising Atlantic Canada . In recent years, the CBC has also expanded into new media ventures including

31396-401: The translator stations are not permitted to originate programming when the "primary" AM station is broadcasting, they are permitted to do so during nighttime hours for AM stations licensed for daytime-only operation. Prior to the adoption of the new policy, as of March 18, 2009, the FCC had issued 215 Special Temporary Authority grants for FM translators relaying AM stations. After creation of

31584-492: The upper end of the Region 2 AM broadcast band, by adding ten frequencies which spanned from 1610 kHz to 1700 kHz. At this time it was suggested that as many as 500 U.S. stations could be assigned to the new frequencies. On April 12, 1990, the FCC voted to begin the process of populating the expanded band, with the main priority being the reduction of interference on the existing AM band, by transferring selected stations to

31772-548: The war the availability of tubes sparked a great increase in the number of amateur radio stations experimenting with AM transmission of news or music. Vacuum tubes remained the central technology of radio for 40 years, until transistors began to dominate in the late 1950s, and are still used in the highest power broadcast transmitters. Unlike telegraph and telephone systems, which used completely different types of equipment, most radio receivers were equally suitable for both radiotelegraph and radiotelephone reception. In 1903 and 1904

31960-742: The world's first high-definition television technology in 1964 and launching high definition services in Japan in 1981. The public broadcaster in Malaysia is the state-owned Radio Televisyen Malaysia (RTM) and TV Alhijrah . RTM was previously funded publicly through money obtained from television licensing , however it is currently state-subsidised, as television licences have been abolished. As of 2021 RTM operates 6 national, 16 state and 11 district radio stations as well as 6 national terrestrial television channels: TV1 , TV2 , TV Okey , Sukan RTM , Berita RTM , and TV6. AM broadcasting AM broadcasting

32148-404: The youngest demographic groups. Among persons aged 12–24, AM accounts for only 4% of listening, while FM accounts for 96%. Among persons aged 25–34, AM accounts for only 9% of listening, while FM accounts for 91%. The median age of listeners to the AM band is 57 years old, a full generation older than the median age of FM listeners." In 2009, the FCC made a major regulatory change, when it adopted

32336-469: Was 15 kHz resulting in bandwidth of 30 kHz. Another common limitation on AM fidelity is the result of receiver design, although some efforts have been made to improve this, notably through the AMAX standards adopted in the United States. Bras%C3%ADlia Brasília ( / b r ə ˈ z ɪ l i ə / brə- ZIL -ee-ə , Brazilian Portuguese: [bɾaˈzili.ɐ, bɾaˈziljɐ] )

32524-424: Was a student of the famous modernist architect Le Corbusier , and some of modernism 's architecture features can be found in his plan. Costa's plan was not as detailed as some of the plans presented by other architects and city planners. It did not include land use schedules, models, population charts or mechanical drawings; however, it was chosen by five out of six jurors because it had the features required to align

32712-474: Was approved by the FCC for use by AM stations, initially only during daytime hours, due to concerns that during the night its wider bandwidth would cause unacceptable interference to stations on adjacent frequencies. In 2007 nighttime operation was also authorized. The number of hybrid mode AM stations is not exactly known, because the FCC does not keep track of the stations employing the system, and some authorized stations have later turned it off. But as of 2020

32900-399: Was certainly an homage to Le Corbusier and his enchantment with the aircraft as an architectural masterpiece. However, Brasilia was constructed soon after the end of World War II. Despite Brazil's minor participation in the conflict, the airplane shape of the city was key in envisioning the country as part of the newly globalized world, together with the victorious Allies. Furthermore, Brasilia

33088-644: Was created in February 1970, following the passage of the Public Broadcasting Act of 1967. This network replaced the Ford Foundation–backed National Educational Radio Network . Some independent local public radio stations buy their programming from distributors such as NPR; Public Radio International (PRI); American Public Media (APM); Public Radio Exchange (PRX); and Pacifica Radio , most often distributed through

33276-400: Was immediately recognized that, much like the telegraph had preceded the invention of the telephone, the ability to make audio radio transmissions would be a significant technical advance. Despite this knowledge, it still took two decades to perfect the technology needed to make quality audio transmissions. In addition, the telephone had rarely been used for distributing entertainment, outside of

33464-411: Was not carefully planned. At the intersection of the Monumental and Residential Axis Costa planned the city center with the transportation center (Rodoviaria), the banking sector and the hotel sector, near to the city center, he proposed an amusement center with theaters, cinemas and restaurants. Costa's Plan is seen as a plan with a sectoral tendency, segregating all the banks, the office buildings, and

33652-400: Was not enacted until 15 September 1997. Though a public broadcaster, it airs commercial advertisements. In Indonesia, there are three types of public broadcaster. The first two are national-scale broadcasters: Radio Republik Indonesia (RRI) and Televisi Republik Indonesia (TVRI). RRI currently operates four radio networks carried by some or all of more than 90 local stations, one of them is

33840-703: Was not established until the 1920s, following the development of vacuum tube receivers and transmitters. AM radio remained the dominant method of broadcasting for the next 30 years, a period called the " Golden Age of Radio ", until television broadcasting became widespread in the 1950s and received much of the programming previously carried by radio. Later, AM radio's audiences declined greatly due to competition from FM ( frequency modulation ) radio, Digital Audio Broadcasting (DAB), satellite radio , HD (digital) radio , Internet radio , music streaming services , and podcasting . Compared to FM or digital transmissions , AM transmissions are more expensive to transmit due to

34028-433: Was once the dominant or only form of broadcasting in many countries (with the notable exceptions of the United States, Mexico, and Brazil). Commercial broadcasting now also exists in most of these countries; the number of countries with only public broadcasting declined substantially during the latter part of the 20th century . The primary mission of public broadcasting is that of public service, speaking to and engaging as

34216-443: Was part of Juscelino's "fifty years of prosperity in five" plan. Already in 1892, the astronomer Louis Cruls , in the service of the Brazilian government, had investigated the site for the future capital. Lúcio Costa won a contest and was the main urban planner in 1957, with 5550 people competing. Oscar Niemeyer was the chief architect of most public buildings, Joaquim Cardozo was the structural engineer , and Roberto Burle Marx

34404-402: Was ranked the fourth-most populous city in Brazil after São Paulo , Rio de Janeiro, and Salvador . In 2010, the city had 474,871 opposite-sex couples and 1,241 same-sex couples. The population of Brasilia was 52.2% female and 47.8% male . In the 1960 census there were almost 140,000 residents in the new Federal district . By 1970 this figure had grown to 537,000. By 2010 the population of

34592-517: Was rented to a private operator on 1 October 1993 and is now known today as " Chilevisión ". Televisión Nacional, popularly known as Channel 7 due to its Santiago frequency, is governed by a seven-member board appointed by both the President and the Senate . It is meant to be independent of political pressures, although accusations of bias have been made, especially during election campaigns. Ecuador TV

34780-476: Was the landscape designer . Brasilia was built in 41 months, from 1956 to 21 April 1960, when it was officially inaugurated. The city sits at an elevation of 1,000 metres (3,300 ft) and more, high on the Brazilian Highlands in the country's center-western region. Paranoá Lake , a large artificial lake, was built to increase the amount of water available and to maintain the region's humidity. It has

34968-468: Was the first organization to create a radio network, and also to promote commercial advertising, which it called "toll" broadcasting. Its flagship station, WEAF (now WFAN) in New York City, sold blocks of airtime to commercial sponsors that developed entertainment shows containing commercial messages . AT&T held a monopoly on quality telephone lines, and by 1924 had linked 12 stations in Eastern cities into

35156-406: Was the lack of amplifying the signals, so listeners had to use earphones , and it required the development of vacuum-tube receivers before loudspeakers could be used. The dynamic cone loudspeaker , invented in 1924, greatly improved audio frequency response over the previous horn speakers, allowing music to be reproduced with good fidelity. AM radio offered the highest sound quality available in

35344-498: Was to have small self-contained and self-sufficient neighborhoods and uniform buildings with apartments of two or three different categories, where he envisioned the integration of upper and middle classes sharing the same residential area. The urban design of the communal apartment blocks was based on Le Corbusier 's Ville Radieuse of 1935, and the superblocks on the North American Radburn layout from 1929. Visually,

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