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WJLA (TV)
WJLA-TV (channel 7) is a television station in Washington, D.C., affiliated with American Broadcasting Company, ABC. It is one of two flagship (broadcasting), flagship stations of Sinclair Broadcast Group (alongside dual Fox Broadcasting Company, Fox/MyNetworkTV affiliate WBFF [channel 45] in Baltimore), and is also sister station, sister to Woodstock, Virginia–licensed low-power broadcasting#Television, low-powered, Class A television service, Class A TBD (TV network), TBD station WDCO-CD (channel 10) and local cable television, cable channel WJLA 24/7 News. WJLA-TV's studios are located on Wilson Boulevard in the Rosslyn, Virginia, Rosslyn section of Arlington County, Virginia, Arlington, Virginia, and its transmitter is located in the Tenleytown neighborhood of Northwest, Washington, D.C., northwest Washington. History The District of Columbia's third television station began broadcasting on October 3, 1947 as WTVW, owned by the ''Washington Star'', along with WMAL radio ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Very High Frequency
Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves ( radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF). VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles). Common uses for radio waves in the VHF band are Digital Audio Broadcasting (DAB) and FM radio broadcasting, television broadcasting, two-way land mobile radio systems (emergency, business, private use and military), long range data communication up to several tens of kilometers with radio modems, amateur radio, and marine communications. Air traffic control communications and air navigation systems (e.g. VOR and ILS) wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
