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A coverage map may be produced to indicate the area in which a certain signal strength is delivered. [1] Even if it is 100% accurate (which it never is), a major factor on whether a signal is receivable depends very much on whether the receiving apparatus is sensitive enough to use a signal of that level.
In US broadcasting, service contour (or protected contour) refers to the area in which the Federal Communications Commission (FCC) predicts coverage.. The FCC calculates FM and TV contours based on effective radiated power (ERP) in a given direction, the radial height above average terrain (HAAT) in a given direction, the FCC's propagation curves, and the station's class.
92.3 FM Spencer: WI: ESPN Radio 92.3 KRAE: 1480 AM Cheyenne: WY: ESPN Radio 1480 ... (such as select event coverage, along with overnight and weekend programming). ...
The "primary service area" is the area served by a station's strongest signal. The "city-grade contour" is 70 dBμ (decibels relative to one microvolt per meter of signal strength) or 3.16mV/m (millivolts per meter) for FM stations in the United States, according to Federal Communications Commission (FCC) regulations.
Therefore, in effect, the FM broadcast band comprises only FM channels 201 (88.1 MHz) through 300 (107.9 MHz). Originally, FM stations in a market were generally spaced four channels (800 kHz) apart. This spacing was developed in response to problems perceived on the original FM band, mostly due to deficiencies in receiver technology of the time.
The Broadcasting Corporation of China (BCC), a private company with nationwide coverage, operates three AM and three FM networks as well as a digital audio broadcasting system. In July 2010, the Government of the Republic of China announced plans for digital convergence by 2015. During the first stage of the program, from 2010 through 2012, a ...
Wrotham was the first station in the UK to broadcast on VHF/FM, with three services beginning officially on 2 May 1955. It broadcast the Home Service (now Radio 4), the Third Programme (now Radio 3) and the Light Programme (now Radio 2). The frequencies it used for these programmes on FM in 1955 are still in use today.
Due to WIBW's low transmitting frequency, plus Kansas's flat terrain and excellent ground conductivity, [5] the station has an unusually large daytime coverage area, equivalent to that of a full-power FM station. It offers at least grade B coverage of a majority of Kansas, as well as large portions of Nebraska, Missouri, Oklahoma and Iowa.