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BBC Radio 5 Sports Extra (formerly BBC Radio 5 Live Sports Extra) is a British digital radio station owned and operated by the BBC, and specialising in extended live sports coverage. It is a sister station to BBC Radio 5 Live and shares facilities, presenters and management, and is a department of the BBC North Group division.
The success of Radio 4 News FM during the first Gulf War (1991) led the BBC to propose the launch of a rolling-news service. Initially the plan was to broadcast a rolling news service on BBC Radio 4's long wave frequency; but this met with considerable opposition, both internally and externally, [4] so the BBC decided to close BBC Radio 5 and replace the old service's educational and children ...
Radio waves are defined by the ITU as: "electromagnetic waves of frequencies arbitrarily lower than 3000 GHz, propagated in space without artificial guide". [5] At the high frequency end the radio spectrum is bounded by the infrared band. The boundary between radio waves and infrared waves is defined at different frequencies in different ...
A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment. These report ...
Radiant intensity is used to characterize the emission of radiation by an antenna: [2], = (), where E e is the irradiance of the antenna;; r is the distance from the antenna.; Unlike power density, radiant intensity does not depend on distance: because radiant intensity is defined as the power through a solid angle, the decreasing power density over distance due to the inverse-square law is ...
It equals the spatial frequency. For example, a wavenumber in inverse centimeters can be converted to a frequency expressed in the unit gigahertz by multiplying by 29.979 2458 cm/ns (the speed of light, in centimeters per nanosecond); [5] conversely, an electromagnetic wave at 29.9792458 GHz has a wavelength of 1 cm in free space.
For example, many hydrogen atoms emit a radio wave photon that has a wavelength of 21.12 cm. Also, frequencies of 30 Hz and below can be produced by and are important in the study of certain stellar nebulae [4] and frequencies as high as 2.9 × 10 27 Hz have been detected from astrophysical sources. [5]
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