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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 ...
5 Live Sport is the banner of live sports coverage on BBC Radio 5 Live. The regular presenters are Mark Chapman (Monday, Wednesday and Saturday), Kelly Cates (Tuesday), Steve Crossman (Thursday and Sunday) and Darren Fletcher (Friday). The programme is on air from Monday to Wednesday 7pm to 10:30pm, as well as Thursday and Friday 7pm to 10pm.
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 ...
The radio spectrum is divided into a number of radio bands on the basis of frequency, allocated to different uses. Higher-frequency, shorter-wavelength radio waves are called microwaves. Diagram of the electric fields (E) and magnetic fields (H) of radio waves emitted by a monopole radio transmitting antenna (small dark vertical line in the ...
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.
Use the audio icons in the 'watch & listen' tab for live BBC Radio commentaries Premiership: Harlequins v Leicester Tigers (18:00 GMT) - BBC Radio 5 Sports Extra, BBC Radio London & BBC Radio ...
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]