Instruct: Given a question, retrieve documents that answer the question.
Query: How far can a radio station broadcast?
VHF Radio waves do not travel far beyond the visual horizon, so reception distances for FM stations are usually limited to 30–40 miles (50–65 km) They can also be blocked by hills or buildings.
The Cincinnati Bengals Radio Network is an American radio network consisting of 37 radio stations which carry coverage of the Cincinnati Bengals, a professional football team in the NFL. WCKY/Cincinnati (1530 AM), WEBN/Cincinnati (102.7 FM), and WLW/Cincinnati (700 AM) serve as the network's 3 flagship stations. The network also includes 34 affiliates in the U.S. states of Ohio, Kentucky, Indiana, and West Virginia: 25 AM stations, 7 of which extend their signals with one or more low-power FM translators; and 9 full-power FM stations. Dan Hoard is the current play-by-play announcer, while Dave Lapham serves as color commentator. In addition to traditional over-the-air AM and FM broadcasts, the Bengals are available on SiriusXM satellite radio, and online with NFL Audio Pass.
Skywave modes of radio communication operate by bending (refracting) radio waves (electromagnetic radiation) through the Ionosphere. During the "peaks" of the solar cycle, the ionosphere becomes increasingly ionized by solar photons and cosmic rays. This affects the propagation of the radio wave in complex ways that can either facilitate or hinder communications. Forecasting of skywave modes is of considerable interest to commercial marine and aircraft communications, amateur radio operators and shortwave broadcasters. These users occupy frequencies within the High Frequency or 'HF' radio spectrum that are most affected by these solar and ionospheric variances. Changes in solar output affect the maximum usable frequency, a limit on the highest frequency usable for communications.
Listening habits changed in the 1960s due to the introduction of the revolutionary transistor radio, which made possible by the invention of the transistor in 1946. Their compact size — small enough to fit in 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.
Since 1980, the popularity of portable radios has declined with the rise of portable audio players and smartphones, which allow users to carry and listen to the music of their choosing and may also include a radio tuner. This began in the late 1970s with boom boxes and portable cassette players such as the Sony Walkman, followed by portable CD players. A common type now is the portable digital audio player. This type of device is a popular choice with listeners who are dissatisfied with terrestrial music radio because of a limited selection of music and reception problems. However, transistor radios are still popular for news, talk radio, weather, live sporting events and emergency alert applications.
During game broadcasts, WEEI-FM is also made available through the Major League Baseball web site (for a fee), and (for home games) on XM Satellite Radio (as part of the standard service) for those outside the Boston listening area. The entire 162-game Red Sox schedule also may be heard on an extensive radio network throughout the 6 New England states. Many of the smaller stations have always aired the Red Sox Network regardless of what Boston station originated those broadcasts.
ERP for FM radio in the United States is always relative to a theoretical reference half-wave dipole antenna. (That is, when calculating ERP, the most direct approach is to work with antenna gain in dBd). To deal with antenna polarization, the Federal Communications Commission (FCC) lists ERP in both the horizontal and vertical measurements for FM and TV. Horizontal is the standard for both, but if the vertical ERP is larger it will be used instead.
Tulsa is also served by television and radio broadcasting networks. All major U.S. television networks are represented in Tulsa through local affiliates in the designated market area (a region covering a 22-county area serving the northeastern and east-central portions of Oklahoma, and far southeastern Kansas); these include NBC affiliate KJRH-TV (channel 2), CBS affiliate KOTV-DT (channel 6), ABC affiliate KTUL (channel 8), PBS station KOED-TV (channel 11, a satellite of the state-run OETA member network), CW affiliate KQCW-DT (channel 19), Fox affiliate KOKI-TV (channel 23), MyNetworkTV affiliate KMYT-TV (channel 41), Ion Television owned-and-operated station KTPX-TV (channel 44). The market is also home to several religious stations including TBN owned-and-operated station KDOR-TV (channel 17), religious/secular independent station KWHB (channel 47), and Oral Roberts University-owned KGEB (channel 53, which is distributed nationwide via satellite as GEB America).
Transmitting antennas for long and medium wave are usually implemented as a mast radiator. Similar antennas with smaller dimensions are used also for short wave transmitters, if these send in the round spray enterprise. For arranging radiation at free standing steel towers fastened planar arrays are used. Radio towers for UHF and TV transmitters can be implemented in principle as grounded constructions. Towers may be steel lattice masts or reinforced concrete towers with antennas mounted at the top. Some transmitting towers for UHF have high-altitude operating rooms and/or facilities such as restaurants and observation platforms, which are accessible by elevator. Such towers are usually called TV tower. For microwaves one frequently uses parabolic antennas. These can be set up for applications of radio relay links on transmitting towers for FM to special platforms. For example, large parabolic antennas ranging from 3 to 100 meters in diameter are necessary to pass on signals to television satellites and space vehicles. These plants, which can be used if necessary also as radio telescope, are established on free standing constructions, whereby there are also numerous special designs, like the radio telescope in Arecibo.
This made the station the first network owned-and-operated station in the Milwaukee market. WXIX's tenure as a CBS O&O, however, was not successful. Only a small percentage of television sets in the Milwaukee area were even capable of receiving UHF stations at the time, as set manufacturers were not required to equip televisions with UHF tuners until 1964 as a result of the 1961 passage of the All-Channel Receiver Act. Those viewers not lucky enough to get a signal from WBBM-TV in Chicago, WISC-TV in Madison, or WBAY-TV in Green Bay were forced to rely on expensive UHF converters to watch channel 19, and even then the picture quality left a lot to be desired. However, unlike many early UHF stations, it managed to survive into the All-Channel era.
A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, made possible by the invention of the transistor in 1947, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s. Their pocket size sparked a change in popular music listening habits, allowing people to listen to music anywhere they went. Beginning in the 1980s, however, cheap AM transistor radios were superseded by devices with higher audio quality such as portable CD players, personal audio players, boomboxes, and (eventually) smartphones, some of which contain radios themselves.
In addition to its main signal, WGBA operates two translators to extend the station's coverage northward. The translators are a remnant of the analog era when it was Green Bay's only major UHF commercial television station. The station in fact kept a post office box address open for years to allow responses to an offer through a station promo of a free pamphlet describing the installation of a UHF television antenna to interested viewers until the early 1990s. During that period, residents of Northern Door County and the southern portion of Michigan's Upper Peninsula could easily receive the three Green Bay network stations on VHF and WFRV semi-satellite WJMN-TV from Escanaba, Michigan, along with PBS member station WNMU from Marquette, Michigan, but not WGBA and Wisconsin Public Television's WPNE-TV (channel 38).
The Boston Red Sox Radio Network consists of 61 stations (39 A.M., 22 F.M. and 7 F.M. translators) in the 6 New England states, along with New Mexico, New York, and Wyoming. The primary English-language announcers are Joe Castiglione and Tim Neverett, who alternate play-by-play and color commentary. In 2015, Rob Bradford and Lou Merloni filled in for former announcer Dave O'Brien when he called "Monday Night Baseball" for ESPN. Mike Mutnansky serves as pre- and post-game host.
As of the early 1970s, CDF systems used VHF "high band" (151 MHz repeater/159 MHz mobile) stand-alone repeaters on State of California communications sites. CDF was an early adopter of walkie-talkies (hand-held radios), but the radios did not perform to modern public safety system standards. The systems served their purpose, but were not originally engineered for hand-held coverage because of the enormous operating areas, the difficult terrain, and the lack of infrastructure to support a complex system. Sites had commercial power, but many lacked reliable telephone lines or microwave radio connectivity. In terms of geography, CDF served mostly rural areas and the radio repeater sites to cover these areas were located in remote wildland. Voting was in its infancy and, in CDF repeater systems, was unheard-of. Users understood this and used radios in clever ways. For example, if an engine arriving at a fire could not find a spot where they had a radio path to reach dispatch, they would call another engine that could communicate and ask the staff to relay their message. The unit might see if they could get through by switching to an alternate channel, such as State net, which had repeaters at different sites, and consequently, a different coverage area.
The Sports Broadcasting Act of 1961 and Public Law 89-800, which govern the antitrust exemptions given to the National Football League, prohibit the broadcasting of NFL games within 75 miles of any high school football game on Friday nights between September and early December. Because most populated areas of the United States have at least one high school football game within a 75-mile radius, and because broadcasting is an integral part of the NFL's business model (roughly half of the league's revenue comes from television contracts), this effectively prohibits the playing of NFL games in competition with high school football. (These rules do not apply during preseason, when Friday night games are common, nor does it apply at the end of the season, though the only time regular season games are played on Friday in the NFL is on Christmas.) Only recently have national sports television channels fully capitalized on this rule; since 2005, the ESPN family of networks (usually the sub-networks ESPN2, ESPNU and online broadcaster ESPN3, although the main channel also shows occasional games) has aired regular season matchups between nationally ranked teams under the "High School Showcase" banner. Fox Sports 1 also included high school football in its lineup when it launched in 2013.
Telephone Newspapers, introduced in the 1890s, transmitted news and entertainment to subscribers over telephone lines. They were the first example of electronic broadcasting, although only a few were established, most commonly in European cities. These systems predated the development, in the 1920s, of radio broadcasting. They were eventually supplanted by radio stations, because radio signals could more easily cover much wider areas with higher quality audio, without incurring the costs of a telephone line infrastructure.
The introduction of the telephone in the mid-1870s included numerous demonstrations of its use for transmitting musical concerts over various distances. In one particularly advanced example, Clément Ader prepared a listening room at the 1881 Paris Electrical Exhibition, where attendees could listen to performances, in stereo, from the Paris Grand Opera. The concept also appeared in Edward Bellamy's influential 1888 utopian novel, "Looking Backward: 2000-1887", which foresaw audio entertainment sent over telephone lines to private homes.
NBC intended to make Chicago a major hub for its radio networks. In 1930, the network leased more than 66,000 square feet of space in the newly completed Merchandise Mart with plans to move 50 radio programs which were presently originating in New York to their new Chicago headquarters. In 1931, NBC was able to purchase Chicago radio station WENR from financially troubled Samuel Insull. Later in the year, it bought WMAQ from the "Daily News". With the purchase of WMAQ, the network now owned a radio station in Chicago for their Blue Network (WENR) and their Red Network (WMAQ). While WMAQ was moved to NBC's new Merchandise Mart base of operations a few months after it was purchased, WENR remained at Chicago's Civic Opera House, where it was based when owned by Insull.
TV and FM (frequency modulated ) radio transmitter stations as well as transposer stations are almost always built on top of hills. A single station may have many transmitters both for TV and FM. In rare cases, each transmitter has an antenna system. But in stations where many transmitters are used, this is not always possible, so the outputs of transmitters transmitting in the same frequency band are combined by a diplexer and applied to a single antenna system. (i.e. VHF 1, VHF 2, VHF 3, UHF). If two or more antenna systems have to be used, higher frequency antennas are mounted higher on the antenna mast. (The sequence of antenna systems on a typical TV-FM station may be from bottom to top; VHF-2, VHF-3 and UHF.)
Microwave stations are also high altitude stations. Although high altitude is desirable also in GSM, the operators may use low power intracity stations for areas of high population density.
Because XETV-TDT is licensed to Tijuana by the Mexican government, it is not covered under the FCC's must carry rules. This means that local cable providers are not required to carry XETV-TDT, even if the television station requests to be carried under this provision. As an English-language station XETV had been carried by Cox Communications, Time Warner Cable (now Charter Spectrum) and AT&T U-verse in San Diego, all on channel 6. KFMB-TV's "The CW San Diego" has replaced XETV on the American cable systems, as well as satellite television providers DirecTV and Dish Network. XETV is carried by all Mexican cable systems in its coverage area, as carriage of local broadcast stations is mandated by the Federal Telecommunications Institute (IFT).
As of 2015, the United States Air Force still trains ten people a year in Morse. The United States Coast Guard has ceased all use of Morse code on the radio, and no longer monitors any radio frequencies for Morse code transmissions, including the international medium frequency (MF) distress frequency of 500 kHz. However, the Federal Communications Commission still grants commercial radiotelegraph operator licenses to applicants who pass its code and written tests. Licensees have reactivated the old California coastal Morse station KPH and regularly transmit from the site under either this Call sign or as KSM. Similarly, a few US Museum ship stations are operated by Morse enthusiasts.
Radio Sagarmatha is a FM radio stations in Kathmandu Valley of Nepal. Established in May 1997, Radio Sagarmatha is the first independent community radio broadcasting station in South Asia.
The meaning of Sagarmatha is Mount Everest, which is the highest mountain in the world. It airs its programs in FM 102.4 MHz.
The signal strength of radio waves decreases the farther they travel from the transmitter, so a radio station can only be received within a limited range of its transmitter. The range depends on the power of the transmitter, the sensitivity of the receiver, atmospheric and internal noise, as well as any geographical obstructions such as hills between transmitter and receiver. AM broadcast band radio waves travel as ground waves which follow the contour of the Earth, so AM radio stations can be reliably received at hundreds of miles distance. Due to their higher frequency, FM band radio signals cannot travel far beyond the visual horizon; limiting reception distance to about 40 miles (64 km), and can be blocked by hills between the transmitter and receiver. However FM radio is less susceptible to interference from radio noise (RFI, sferics, static) and has higher fidelity; better frequency response and less audio distortion, than AM. So in many countries serious music is only broadcast by FM stations, and AM stations specialize in radio news, talk radio, and sports. Like FM, DAB signals travel by line of sight so reception distances are limited by the visual horizon to about 30–40 miles (48–64 km).
Law No 9612/1998 deals with community radio broadcasting, sound stations belonging to foundations or associations representing a public contained therein, living in a neighborhood or united by a social cause and that the station presents itself as a spokesperson of these people. It has to operate with a maximum power of 25 watts ERP and its tower will have the limit of 30 meters. These technical characteristics delineate a portion coverage of an urban area, a partial coverage in the municipality. As said, the community broadcaster has a cultural function, there can be no explicit commercial breaks but cultural supports of the content of the grid. Programming times can not be sold to third parties and broadcasting to other stations is prohibited (going against the idea of a "community radio").
The first regular television broadcasts started in 1937. Broadcasts can be classified as "recorded" or "live". The former allows correcting errors, and removing superfluous or undesired material, rearranging it, applying slow-motion and repetitions, and other techniques to enhance the program. However, some live events like sports television can include some of the aspects including slow-motion clips of important goals/hits, etc., in between the live television telecast. American radio-network broadcasters habitually forbade prerecorded broadcasts in the 1930s and 1940s requiring radio programs played for the Eastern and Central time zones to be repeated three hours later for the Pacific time zone (See: Effects of time on North American broadcasting). This restriction was dropped for special occasions, as in the case of the German dirigible airship "Hindenburg" disaster at Lakehurst, New Jersey, in 1937. During World War II, prerecorded broadcasts from war correspondents were allowed on U.S. radio. In addition, American radio programs were recorded for playback by Armed Forces Radio radio stations around the world.
Ground stations transmit signals to the satellites which are 35,786 kilometers (22,236 miles) above the Equator in Clarke belt orbits. The satellites send the signals back down to radio receivers in cars and homes. This signal contains scrambled broadcasts, along with meta data about each specific broadcast. The signals are unscrambled by the radio receiver modules, which display the broadcast information. In urban areas, ground repeaters enable signals to be available even if the satellite signal is blocked. The technology allows for nationwide broadcasting, so that, for instance US listeners can hear the same stations anywhere in the country.