Radio 4

Radio 4 may refer to:

BBC Radio 4

BBC Radio 4 is a radio station owned and operated by the British Broadcasting Corporation (BBC) that broadcasts a wide variety of spoken-word programmes including news, drama, comedy, science and history. It replaced the BBC Home Service in 1967. The station controller is Gwyneth Williams; and the station is part of BBC Radio and the BBC Radio department. The station is broadcast from the BBC's headquarters at Broadcasting House, London.

It is the second most popular domestic radio station in the UK, broadcast throughout the UK, the Isle of Man and the Channel Islands on FM, LW and DAB; and can be received in the north of France and Northern Europe. It is also available through Freeview, Sky, Virgin Media and on the Internet. Its sister station, BBC Radio 4 Extra (formerly BBC 7), complements the main channel by broadcasting repeats from the Radio 4 archive, extended versions of Radio 4 programmes and supplements to series such as The Archers and Desert Island Discs.

It is notable for its news bulletins and programmes such as Today and The World at One, heralded on air by the Greenwich Time Signal "pips" or the chimes of Big Ben.

BBC

The British Broadcasting Corporation (BBC) is the public service broadcaster of the United Kingdom, headquartered at Broadcasting House in London.

The BBC is the world's oldest national broadcasting organisation and the largest broadcaster in the world by number of employees, with over 20,950 staff in total, of whom 16,672 are in public sector broadcasting; including part-time, flexible as well as fixed contract staff, the total number is 35,402.

The BBC is established under a Royal Charter and operates under its Agreement with the Secretary of State for Culture, Media and Sport. Its work is funded principally by an annual television licence fee which is charged to all British households, companies, and organisations using any type of equipment to receive or record live television broadcasts. The fee is set by the British Government, agreed by Parliament, and used to fund the BBC's extensive radio, TV, and online services covering the nations and regions of the UK. From 1 April 2014, it also funds the BBC World Service, launched in 1932, which provides comprehensive TV, radio, and online services in Arabic, and Persian, and broadcasts in 28 languages.

Radio

Radio is the use of radio waves is to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc. Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.

In Our Time

In Our Time may refer to:

Art, entertainment, and media

Films

Literature

Music

Radio

See also