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A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast. There is no physical difference between a carrier and a subcarrier; the "sub" implies that it has been derived from a carrier, which has been amplitude modulated by a steady signal and has a constant frequency relation to it.
The FM broadcast band is a range of radio frequencies used for FM broadcasting by radio stations. The range of frequencies used differs between different parts of the world. In Europe and Africa and in Australia and New Zealand, it spans from 87.5 to 108 megahertz (MHz) - also known as VHF Band II - while in the Americas it ranges from 88 to 108 MHz. The FM broadcast band in Japan uses 76 to 95 MHz, and in Brazil, 76 to 108 MHz. The International Radio and Television Organisation (OIRT) band in Eastern Europe is from 65.9 to 74.0 MHz, although these countries now primarily use the 87.5 to 108 MHz band, as in the case of Russia. Some other countries have already discontinued the OIRT band and have changed to the 87.5 to 108 MHz band.
Second audio program (SAP), also known as secondary audio programming, is an auxiliary audio channel for analog television that can be broadcast or transmitted both over-the-air and by cable television. Used mostly for audio description or other languages, SAP is part of the multichannel television sound (MTS) standard originally set by the National Television Systems Committee (NTSC) in 1984 in the United States. The NTSC video format and MTS are also used in Canada and Mexico.
WBEN is a commercial AM radio station licensed to Buffalo, New York, featuring a talk radio format. Owned by Audacy, Inc., the station serves Western New York, the Niagara Falls region, and parts of Southern Ontario. WBEN's studios are located in Amherst, while the transmitter site is in Grand Island. In addition to a standard analog transmission, WBEN is relayed over WKSE's HD3 digital subchannel, and is available online via Audacy.
WFLA is a commercial AM radio station in Tampa, Florida, and serving the Tampa Bay media market. The station airs a talk radio format and is owned and operated by iHeartMedia, Inc. The station's studios and offices are located on Gandy Boulevard in South Tampa.
KKOB is a commercial AM radio station, licensed to Albuquerque, New Mexico and owned by Cumulus Media. Its news/talk format is branded as "96.3 Newsradio KKOB", reflecting a simulcast with co-owned KKOB-FM (96.3 FM. Studios and offices are located in Downtown Albuquerque. KKOB is the oldest station in New Mexico, and is the state's primary entry point for the Emergency Alert System.
FM broadcasting is the method of radio broadcasting that uses frequency modulation (FM). Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to transmit high-fidelity sound over broadcast radio. FM broadcasting offers higher fidelity—more accurate reproduction of the original program sound—than other broadcasting techniques, such as AM broadcasting. It is also less susceptible to common forms of interference, having less static and popping sounds than are often heard on AM. Therefore, FM is used for most broadcasts of music and general audio. FM radio stations use the very high frequency range of radio frequencies.
WWL is a U.S. AM radio station in New Orleans, Louisiana, owned by Audacy, Inc. The station has a talk radio format with sports talk at night. Studios are at the 400 Poydras Tower in the New Orleans Central Business District.
WJBO is a commercial AM radio station in Baton Rouge, Louisiana, calling itself "WJBO Newsradio 1150 AM & 98.7 FM." It carries a talk radio format and is owned by iHeartMedia, Inc. The studios are on Hilton Avenue, east of downtown Baton Rouge.
The BBC National Programme was a radio service which was on the air from 9 March 1930 – replacing the earlier BBC's experimental station 5XX – until 1 September 1939 when it was subsumed into the Home Service, two days before the outbreak of World War II.
KTRH is a commercial radio station licensed to Houston, Texas. It airs a talk radio format and is owned by iHeartMedia, Inc. Its studios are along the West Loop Freeway (I-610) in the city's Uptown district. The transmitter site, a four-tower array, is in unincorporated Liberty County, off Cox Road in Dayton. KTRH is one of the oldest radio stations in the United States, first licensed to Austin on April 22, 1922. Programming is also heard on co-owned KODA's HD 2 subchannel at 99.1MHz, and on the iHeartRadio platform. KTRH is the Southern Texas primary entry point station for the Emergency Alert System.
WHP is a commercial AM radio station licensed to Harrisburg, Pennsylvania, serving the Harrisburg–Carlisle region of South Central Pennsylvania. It broadcasts a talk radio format and is owned by iHeartMedia, Inc. The studios are on Corporate Circle in Harrisburg. Weekdays begin with a local talk show hosted by R.J. Harris followed by nationally syndicated conservative talk shows from Sean Hannity, Glenn Beck, Jesse Kelly, Clay Travis & Buck Sexton and "Coast to Coast AM with George Noory."
Phonevision was a project by Zenith Radio Company to create the world's first pay television system. It was developed and first launched in Chicago, followed by further trials in New York City and Hartford, Connecticut.
WSBT is a commercial radio station in South Bend, Indiana, which airs a sports radio format. It is owned by Mid-West Family Broadcasting, with studios and offices on East Monroe Street in downtown South Bend.
KEEL is an American radio station broadcasting a News Talk Information format. Licensed to Shreveport, Louisiana, United States, the station serves the Shreveport area. The station is currently owned by Townsquare Media and features programming from Compass Media Networks, Premiere Networks, Radio America, Talk Shows USA, and Westwood One, and airs Louisiana Tech games. Fox News updates are carried at the top of every hour. Its studios are shared with its other five sister stations in West Shreveport, and the transmitter is in Dixie.
KWKH is a sports radio station serving Shreveport, Louisiana. The 50-kilowatt station broadcasts at 1130 kHz. Formerly owned by Clear Channel Communications and Gap Central Broadcasting, it is now owned by Townsquare Media. Its studios are shared with its other five sister stations on Westport Avenue in West Shreveport, and the transmitter is a three-tower array in Belcher, Louisiana.
KMJ is a commercial AM radio station in Fresno, California. It airs a Republican news/talk radio format, and simulcasts with sister station KMJ-FM. Owned by Cumulus Media, the studios and offices are located at the Radio City building on Shaw Avenue in North Fresno.
CCIR System B was the 625-line VHF analog broadcast television system which at its peak was adopted by more than one hundred countries, either with PAL or SECAM colour. It's usually associated with CCIR System G for UHF broadcasts.
WAMC is a public radio station licensed to Albany, New York and owned by WAMC, Inc. The station broadcasts with 1 kW, and is an AM repeater of WAMC-FM.
References
- "W5XA Shreveport, Louisiana". Early Television Museum. Retrieved 31 March 2010.
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