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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 studios are in the NBC Tower on North Columbus Drive in the city's Streeterville neighborhood. The station's programming is also available in the Chicago metropolitan area via a simulcast on the HD2 digital subchannel of sister station WLS-FM. The station formerly broadcast in C-QUAM AM stereo. Its transmitter site 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 non-directional antenna fed by a Nautel NX-50 transmitter, with a Harris DX-50 serving 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
WLS-FM
WLS-FM (94.7 MHz) is a commercial classic hits radio station licensed to serve Chicago, Illinois. Owned by Cumulus Media, the station serves the Chicago metropolitan area, and is the radio home of Dave Fogel. The WLS-FM studios are located at the NBC Tower in the city's Streeterville neighborhood, while its transmitter is located at Willis Tower. History Early years The American Broadcasting Company, owners of Chicago's ABC Radio Network affiliate WENR (890 AM)—which operated in a time-share arrangement with WLS (890 AM), radio adjunct of the ''Prairie Farmer'' and itself an ABC affiliate—launched this station as WENR-FM on January 1, 1948. This time-share agreement ended in February 1954, when ABC's parent company American Broadcasting-Paramount Theatres and the ''Prairie Farmer'' merged their AM stations into one, WLS becoming the surviving entity and jointly owned by both. WENR-FM retained its callsign but began simulcasting WLS's programming, later adopting its own s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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) 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 based in the building. At 10 o'clock on the evening of October 1, 1989, WMAQ-TV broadcast its first newscast from the new home, with the then-weeknight news team of Ron Magers, Carol Marin, John Coleman, and Mark Giangreco. Telemundo O&O WSNS-TV has also occupied the building since its purchase by NBC in 2001, and NBC's former radio properties, WKQX, and WLUP-FM, continue to maintain studios in the tower. The design, by Adrian D. Smith of Skidmore, Owings & Merrill, is in the Art Deco style and bears a marked similarity to 30 Rockefeller Plaza in New York City, which is NBC's global headquarters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Cumulus Media
Cumulus Media, Inc. is a broadcasting company of the United States and is the second largest owner and operator of AM and FM radio stations in the United States ahead of Audacy and behind iHeartMedia iHeartMedia, Inc., or CC Media Holdings, Inc., is an American mass media corporation headquartered in San Antonio, Texas. It is the holding company of iHeartCommunications, Inc., formerly Clear Channel Communications, Inc., a company founded by .... As of June 2019, Cumulus lists ownership of 428 stations in 87 media markets. It also owns and operates Westwood One. Its headquarters are located in Atlanta, Georgia. Its subsidiaries include Cumulus Broadcasting LLC, Cumulus Licensing LLC and Broadcast Software International Inc. History Origins Cumulus Media was established in August 1998 by radio consultant Lewis Dickey Jr. and media and technology entrepreneur Richard Weening. The Telecommunications Act of 1996, among other legislation, relaxed media ownership restrictions, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
WKQX
WKQX (101.1 FM broadcasting, FM) is a commercial radio station licensed to Chicago, Illinois, featuring an alternative rock radio format, format known as "Q101". Owned by Cumulus Media, the station serves the Chicago metropolitan area. WKQX's studios are located in the NBC Tower, while the station transmits from atop the John Hancock Center. In addition to a standard analog transmission, WKQX broadcasts over two HD Radio channels. WKQX is best known for carrying an alternative rock format that, from 1992 until 2011 and since 2022, has used the "Q101" brand. A sale of the station to Merlin Media in August 2011 saw outgoing owner Emmis Communications sell the "Q101 Chicago" name, intellectual property and all underlying trademarks for a unrelated internet radio station Q101 (internet radio), bearing the same name, while WKQX itself flipped to all-news radio under Merlin Media as WWWN, then to adult contemporary as WIQI. Reverting to alternative under a long-term local marketing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
C-QUAM
C-QUAM (Compatible QUadrature Amplitude Modulation) is the method of AM stereo broadcasting used in Canada, the United States and most other countries. It was invented in 1977 by Norman Parker, Francis Hilbert, and Yoshio Sakaie, and published in an IEEE journal. Using circuitry developed by Motorola, C-QUAM uses quadrature amplitude modulation (QAM) to encode the stereo separation signal. This extra signal is then stripped down in such a way that it is compatible with the envelope detector of older receivers, hence the name C-QUAM for Compatible. A 25 Hz pilot tone is added to trigger receivers; unlike its counterpart in FM radio, this carrier is not necessary for the reconstruction of the original audio sources. Description The C-QUAM signal is composed of two distinct modulation stages: a conventional AM version and a compatible quadrature PM version. Stage 1 provides the transmitter with a summed L+R mono audio input. This input is precisely the same as conventional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
AM Stereo
AM stereo is a term given to a series of mutually incompatible techniques for radio broadcasting stereo audio in the AM band in a manner that is compatible with standard AM receivers. There are two main classes of systems: independent sideband (ISB) systems, promoted principally by American broadcast engineer Leonard R. Kahn; and quadrature amplitude modulation (QAM) multiplexing systems (conceptually closer to FM stereo). Initially adopted by many commercial AM broadcasters in the mid to late 1980s, AM stereo broadcasting soon began to decline due to a lack of receivers (most "AM/FM stereo" radios only receive in stereo on FM), a growing exodus of music broadcasters to FM, concentration of ownership of the few remaining stations in the hands of large corporations and the removal of music from AM stations in favor of news/talk or sports broadcasting. By 2001, most of the former AM stereo broadcasters were no longer stereo or had left the AM band entirely. History Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Tinley Park, Illinois
Tinley Park is a village in Cook County, Illinois, Cook and Will County, Illinois, Will counties in the U.S. state of Illinois. The population was 55,971 at the 2020 United States census, 2020 census. It is a suburb in the Chicago metropolitan area. History 19th century Modern settlement of the area now known as Tinley Park began in the 1820s as emigrants from Europe and the eastern United States arrived. By the 1840s, a significant population of German Americans had established themselves in the region. In recognition of their prominence, the village was officially named Bremen when it was founded in 1853. Other early settler groups included Irish Americans, Irish, English Americans, English, Scottish Americans, Scottish, Canadian Americans, Canadian immigrants. In the late 19th century, the Rail transportation in the United States, expansion of the American railroad network had a transformative effect on the area. Bremen was situated along the Chicago, Rock Island and Pacific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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 distingu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Digital Subchannel
In broadcasting, digital subchannels are a method of transmitting more than one independent program stream simultaneously from the same digital radio or television station on the same radio frequency channel. This is done by using data compression techniques to reduce the size of each individual program stream, and multiplexing to combine them into a single signal. The practice is sometimes called " multicasting". ATSC television United States The ATSC digital television standard used in the United States supports multiple program streams over-the-air, allowing television stations to transmit one or more subchannels over a single digital signal. A virtual channel numbering scheme distinguishes broadcast subchannels by appending the television channel number with a period digit (".xx"). Simultaneously, the suffix indicates that a television station offers additional programming streams. By convention, the suffix position ".1" is normally used to refer to the station's main d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Clear-channel Station
A clear-channel station is a North American AM radio station that has the highest level of protection from interference from other stations, particularly from nighttime skywave signals. This classification 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 the 1983 adoption of the Regional Agreement for the Medium Frequency Broadcasting Service in Region 2 (Rio Agreement), 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 a transmitter power output ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Omnidirectional Antenna
In radio communication, an omnidirectional antenna is a class of antenna (electronics), antenna which radiates equal radio power in all directions perpendicular to an Cartesian coordinate system, 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''. This is different from an isotropic radiator, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
