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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.

ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
Electromagnetic spectrum and diagram of radio transmission of an audio signal.

Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.

More on [ Radio ]

Radio :: Arts
Media Production :: Advertising
News and Media :: United Kingdom

Radio - Twitter Search

Looking for radio advertising. http://myloc.me/2elSW
elizabethwindha (Windha Munthe) Mon, 21 Dec 2009 01:44:20 -0000
Looking for radio advertising. http://myloc.me/2elSW
RT @glasswool: NEW on www.angelav.com toolbar: exciting radio and (country / jazz etc., TV channels, and GOAN NEWS FEEDS!
fn (Frederick Noronha) Mon, 21 Dec 2009 01:44:11 -0000
RT @glasswool: NEW on www.angelav.com toolbar: exciting radio and (country / jazz etc., TV channels, and GOAN NEWS FEEDS!
Acabo de completar "Qual música que marcou esse ano pa..." e meu resultado foi: One for the radio - McFly! Experimente: http://bit.ly/5kOzdH
catysaicali (Catarina Nogueira) Mon, 21 Dec 2009 01:44:09 -0000
Acabo de completar "Qual música que marcou esse ano pa..." e meu resultado foi: One for the radio - McFly! Experimente: http://bit.ly/5kOzdH
@RaymondAaron I am sourcing people for an internet radio interview in the new year. Are you interested?
RebeccaHappy (RebeccaHappy) Mon, 21 Dec 2009 01:44:08 -0000
@RaymondAaron I am sourcing people for an internet radio interview in the new year. Are you interested?
cutting work & school tomor to take the girls to see the Radio City Xmas Spectacular, then Tubing at Camelback on Wed....fun filled week!!
ElaineZelker (Elaine Zelker) Mon, 21 Dec 2009 01:44:07 -0000
cutting work & school tomor to take the girls to see the Radio City Xmas Spectacular, then Tubing at Camelback on Wed....fun filled week!!
jadi manusia radio lagi, listening 99,9 fm
lunalilulelo (Luthviana R. A) Mon, 21 Dec 2009 01:44:04 -0000
jadi manusia radio lagi, listening 99,9 fm

 

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DX Radio - Features news and information for dx-ers (long range listeners). Also includes RDS listings.
Meta Description: [ Radio News and Information for dx-ers. Logs of FM and MW dx news and comprehensive UK RDS listings ]

Energynet - Links, news and information on UK radio stations.
Meta Description: [ information on uk radio with news information on fm and am stations broadcasting ]

Independent Radio News - IRN. Main provider of news to the UK's commercial radio stations.

OFCOM - Radio Authority Archive - Archive of the predecessor of OFCOM, The Radio Authority, the UK's previous radio station regulator. Includes station information and listings, publications, press room and licensing information.

Office of Communications (Ofcom) - Independent regulator and competition authority including responsibility for radio broadcasting. Includes sections on codes and guidelines, consultations, consumer guides and research.
Meta Description: [ Ofcom Internet Home page ]

Rajar - Measures and profiles the audiences of UK radio stations.

The Commercial Radio Companies Association - The CRCA is the trade body for commercial radio companies in the United Kingdom.
Meta Description: [ The Commercial Radio Companies Association (CRCA) is the trade body for commercial radio companies in the United Kingdom. It is a voluntary, non profit making body, formed by the first radio companies when Independent Radio began in 1973. It has always enjoyed the overwhelming support of the indu... ]

The Radio Academy - Industry organisation encouraging excellence in UK radio.

The Radio Magazine - UK radio industry news, features and jobs.

UK Radio Website - News and information for the Radio Industry, including DAB, RSL and discussion.
Meta Description: [ UK Radio News and Information ]