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WLS (AM)
WLS (890 kHz) is a commercial AM radio station in Chicago, Illinois. Owned by Cumulus Media, through licensee Radio License Holdings LLC, the station airs a talk radio format. WLS has its radio studios in the NBC Tower on North Columbus Drive in the city's Streeterville neighborhood. Its non-directional broadcast tower is located on the southwestern edge of Tinley Park, Illinois in Will County. WLS is a Class A station broadcasting on the clear-channel frequency of 890 kHz with 50,000 watts using a Nautel NX-50 transmitter. A Harris DX-50 serves as a backup transmitter. Both transmitters run in MDCL (Modulation Dependent Carrier Level) mode to improve efficiency. The station's daytime groundwave service contour covers portions of five states. At night, its signal routinely reaches 38 states via skywave. WLS participates in the Emergency Alert System's primary entry point network, serving that function for northern Illinois and western Indiana. The station's programm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WLS (AM) Logo , in Westchester County, New Y ...
WLS may refer to: Arts, entertainment, and media * WLS (AM), a radio station in Chicago, Illinois, US * WLS-FM, a radio station in Chicago, Illinois, US * WLS-TV, a television station in Chicago, Illinois, US * DWLS, a radio station in Metro Manila, Philippines Biology and healthcare * GPR177, Wntless, or WLS, a human gene Computing and technology * Oracle WebLogic Server, a Java application server * White light scanner, for measuring surface height * Wavelength shifter, material that absorbs a wavelength and emits another Schools * Wisconsin Lutheran Seminary Other uses *WLS, the Chapman code for Wales * Weighted least squares, in statistics * West London Synagogue * Westchester Library System Westchester Library System (WLS) is the library system for the residents of Westchester County, New York. It was established in 1958. The system has 38 public libraries across the county and its headquarters are located in the town of Greenburgh, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AM Radio
AM broadcasting 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 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 most of the programming previously carried by radio. Subsequently, AM radio's audiences have also greatly shrunk due to competition from FM (frequency modulation) radio, Digital Audio Broadcasting (DAB), satellite radio, HD (digital) radio, Internet radio, music streaming servi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skywave
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. Since it is not limited by the curvature of the Earth, skywave propagation can be used to communicate beyond the horizon, at intercontinental distances. It is mostly used in the shortwave frequency bands. As a result of skywave propagation, a signal from a distant AM broadcasting station, a shortwave station, or – during sporadic E propagation conditions (principally during the summer months in both hemispheres) a distant VHF FM or TV station – can sometimes be received as clearly as local stations. Most long-distance shortwave (high frequency) radio communication – between 3 and 30 MHz – is a result of skywave propagation. Since the early 1920s amateur radio operators (or "hams"), limited to lower transmitter power than broadcast stations, have ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Propagation
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere. As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. Understanding the effects of varying conditions on radio propagation has many practical applications, from choosing frequencies for amateur radio communications, international shortwave broadcasters, to designing reliable mobile telephone systems, to radio navigation, to operation of radar systems. Several different types of propagation are used in practical radio transmission systems. ''Line-of-sight propagation'' means radio waves which travel in a straight line from the transmitting antenna to the receiving antenna. Line of sight transmission is used for medium-distance radio transmission, such as cell phones, cordless phones, walkie- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transmitter
In electronics and telecommunications, a radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna (radio), antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the Antenna (radio), antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary component parts of all electronic devices that communicate by radio communication, radio, such as radio broadcasting, radio and television broadcasting stations, cell phones, walkie-talkies, Wireless LAN, wireless computer networks, Bluetooth enabled devices, garage door openers, two-way radios in aircraft, ships, spacecraft, radar sets and navigational beacons. The term ''transmitter'' is usually limited to equipment that generates radio waves for Communication engineering, communication purposes; or radiolocation, such as radar and navigational transmitters. Generators of radio waves for heatin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clear-channel Station
A clear-channel station is an AM broadcasting, AM radio station in North America that has the highest protection from Interference (communication), interference from other stations, particularly concerning night-time skywave propagation. The system exists to ensure the viability of cross-country or cross-continent radio service enforced through a series of treaties and statutory laws. Known as Class A stations since 1982, they are occasionally still referred to by their former classifications of Class I-A (the highest classification), Class I-B (the next highest class), or Class I-N (for stations in Alaska too far away to cause interference to the primary clear-channel stations in the lower 48 states). The term "clear-channel" is used most often in the context of North America and the Caribbean, where the concept originated. Since 1941, these stations have been required to maintain an effective radiated power of at least 10,000 watts to retain their status. Nearly all such station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Broadcast Station Classes
This is a list of broadcast station classes applicable in much of North America under international agreements between the United States, Canada and Mexico. Effective radiated power (ERP) and height above average terrain (HAAT) are listed unless otherwise noted. All radio and television stations within of the US-Canada or US-Mexico border must get approval by both the domestic and foreign agency. These agencies are Industry Canada/Canadian Radio-television and Telecommunications Commission (CRTC) in Canada, the Federal Communications Commission (FCC) in the US, and the Federal Telecommunications Institute (IFT) in Mexico. AM Station class descriptions All domestic (United States) AM stations are classified as A, B, C, or D. * A (formerly I) — clear-channel stations — 10 kW to 50 kW, 24 hours. **Class A stations are only protected within a radius of the transmitter site. **The old Class I was divided into three: Class I-A, I-B and I-N. NARBA distinguishe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tinley Park, Illinois
Tinley Park (formerly Bremen) is a village in Cook County, Illinois, United States, with a small portion in Will County. The village is a suburb of Chicago. Per the 2020 census, the population was 55,971. It is one of the fastest growing suburbs southwest of Chicago. History 19th century Settlement of the area which now comprises Tinley Park began in the 1820s by emigrants from the Eastern United States. German settlers became predominant in area by the 1840s, and the village was established in 1853. The Village was called Bremen at the time. Irish, English, Scottish, Canadian, and other American settlers were also common in the area. In the late 19th century, railroads expanded rapidly, and the village happened to be located on the Chicago, Rock Island and Pacific Railroad line. The influence of the railroad on Bremen was so great that, in 1890, its name was changed to Tinley Park in honor of the village's first railroad station agent, Samuel Tinley, Sr. Even the village's offi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omnidirectional Antenna
In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis. When graphed in three dimensions ''(see graph)'' this radiation pattern is often described as ''doughnut-shaped''. Note that this is different from an isotropic antenna, which radiates equal power in ''all'' directions, having a ''spherical'' radiation pattern. Omnidirectional antennas oriented vertically are widely used for nondirectional antennas on the surface of the Earth because they radiate equally in all horizontal directions, while the power radiated drops off with elevation angle so little radio energy is aimed into the sky or down toward the earth and wasted. Omnidirectional antennas are widely used for radio broadcasting antennas, and in mobile devices that use radio such as cell phones, FM radios, walkie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streeterville
Streeterville is a neighborhood in the Near North Side community area of Chicago, Illinois, United States, north of the Chicago River. It is bounded by the river on the south, the Magnificent Mile portion of Michigan Avenue on the west, and Lake Michigan on the north and east, according to most sources, although the City of Chicago only recognizes a small portion of this region as Streeterville. Thus, it can be described as the Magnificent Mile plus all land east of it. The tourist attraction of Navy Pier extends out into the lake from southern Streeterville. The majority of the land in this neighborhood is reclaimed sandbar. Named for George Streeter, the neighborhood contains a combination of hotels, restaurants, professional office centers, residential high rises, universities, medical facilities, and cultural venues. The area has undergone increased development in the early 21st century as numerous empty lots in Streeterville have been converted into commercial and resi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NBC Tower
__NOTOC__ The NBC Tower is an office tower on the Near North Side of Chicago, Illinois located at 454 North Columbus Drive (455 North Cityfront Plaza is also used as a vanity address for the building) in downtown Chicago's Magnificent Mile area. Completed in 1989, the 37-story building reaches a height of 627 feet (191 m). NBC's Chicago offices, studios, and owned-and-operated station WMAQ-TV are located here as of 1989 and on October 1, 1989, WMAQ-TV broadcast its first newscast at 10:00 that evening at its new home, NBC Tower, with the then-weeknight news team of Ron Magers, Carol Marin, John Coleman, and Mark Giangreco. Later, Telemundo O&O WSNS-TV has also occupied the building since its purchase by NBC in 2001. Formerly its former radio sister WMAQ/WSCR was located here. The studios of NBC's former Chicago FM property, WKQX, and its sister station WLUP-FM are located in the NBC Tower. The design, by Adrian D. Smith of Skidmore, Owings & Merrill, is considered one of the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Studio
A recording studio is a specialized facility for sound recording, mixing, and audio production of instrumental or vocal musical performances, spoken words, and other sounds. They range in size from a small in-home project studio large enough to record a single singer-guitarist, to a large building with space for a full orchestra of 100 or more musicians. Ideally, both the recording and monitoring (listening and mixing) spaces are specially designed by an acoustician or audio engineer to achieve optimum acoustic properties (acoustic isolation or diffusion or absorption of reflected sound echoes that could otherwise interfere with the sound heard by the listener). Recording studios may be used to record singers, instrumental musicians (e.g., electric guitar, piano, saxophone, or ensembles such as orchestras), voice-over artists for advertisements or dialogue replacement in film, television, or animation, foley, or to record their accompanying musical soundtracks. The typical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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