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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.

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Radio :: Arts

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Now playing on Bugis Radio: Elvy Sukaesih - Track 9 (Dangdut) -- http://www.bugis.nl/
bugisradio (Bugis Radio) Sat, 26 Sep 2009 19:52:48 -0000
Now playing on Bugis Radio: Elvy Sukaesih - Track 9 (Dangdut) -- http://www.bugis.nl/
RT @Starli631: @BeyonceFanz Beyonce singing Radio acoustic, live at cancer ward 0_0 http://bit.ly/3xf9CM
BeyonceFanz (BeyonceFan) Sat, 26 Sep 2009 19:52:38 -0000
RT @Starli631: @BeyonceFanz Beyonce singing Radio acoustic, live at cancer ward 0_0 http://bit.ly/3xf9CM
I so did not just buy a radio disney cd...no not me...
sunshinerose07 (Heather Riley) Sat, 26 Sep 2009 19:52:38 -0000
I so did not just buy a radio disney cd...no not me...
Caller from Iran on radio - ppl are chanting "liar, liar" #iranelectionSo ODST. All of the new characters are horrible except ...
std691 (Jazmine Churchill) Sat, 26 Sep 2009 19:52:38 -0000
Caller from Iran on radio - ppl are chanting "liar, liar" #iranelectionSo ODST. All of the new characters are horrible except ...
I must say that the response i get from listeners of HHH Radio often times don't believe that the music i play is all by unsigned artist
HHHRadio (HHH Radio) Sat, 26 Sep 2009 19:52:37 -0000
I must say that the response i get from listeners of HHH Radio often times don't believe that the music i play is all by unsigned artist
Y xq delfines? No vale! Son inteligentes RT @NelsonBocaranda: RT @mirlearencibia: Radio AN se deberia llamar la emisora del zoologico po ...
javvta (Carolina Moncada) Sat, 26 Sep 2009 19:52:32 -0000
Y xq delfines? No vale! Son inteligentes RT @NelsonBocaranda: RT @mirlearencibia: Radio AN se deberia llamar la emisora del zoologico po ...

 

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The Radio Networks - Chicago's fine arts and classical station. Live broadcasts.

Beethoven.com - The World's Classical Radio Station
Meta Description: [ Beethoven.com is The World's Classical Radio Station with interactive LIVE! Radio and Free E-Mail accounts. ]

CHMR 93.5 FM - (St. John's NF, Canada) RealAudio feed, schedule, links.

Classical Live Online Radio - 100+ radio stations around the world, live-broadcasting classical music on the Web, with descriptions and AudioLinks.
Meta Description: [ Classical Online Radio Webcast is a collection of 100+ Live Classical RadioStations and Classical Music on the Web, broadcasting in Realaudio, MediaPlayer or MP3 on the Internet live classicalwebcast on the Net ]

ClassicalFMradio.org - Programmer Art Smoot of Boulder, Colorado, offers analysis tool tracking programming on several US classical stations, just for fun. Free online queries by many criteria.
Meta Description: [ An Analysis tool for reviewing the programming of several Classical FM Radio stations across the US. ]

ClassicalMusicDetroit - Detroit's Only 24/7 Classical Radio - Detroit radio.
Meta Description: [ Classical Music America. Classical music radio online. One of America's first classical music radio stations online. Your place for Beethoven, Mozart, Bach, Brahms and more! ]

classicfm.com - Classical music station. Site includes playlists and a live stream, as well as station information
Meta Description: [ The UK's leading classical music radio station. Listen live, send a request, search playlists, win great prizes, tickets and CDs, read up on favourite composers and artists ]

500 Contemporary Classical Internet Radio - Free Internet radio playing a wide variety of 20th/21st century classical music.

D-dur: Classical music, non stop - Non-commercial Czech classical music radio station. Mp3, WMA, OGG.
Meta Description: [ Český rozhlas D-Dur / Portál - ,Czech radio, Český rozhlas, média, veřejnoprávní, digitalizace, hudba, kultura, vážná, analýza, komentář, politika, publicistika ]

Iridian Radio - Online classical music radio station.

K-Mozart - Los Angeles and Orange County free classical music radio station, featuring weekly program schedule, streaming music, contests, events, jobs, and staff information.

KACU 89.7 FM (Abilene, TX) - (NPR affiliate) schedule, Realaudio feed.

KBPS - Portland, Oregon: non-commercial, classical music and fine arts information.
Meta Description: [ All Classical 89.9, KBPS FM, 90.1 KQHR FM, Classical Radio for Northwest Oregon and Southwest Washington ]

KBYU 89 FM - Schedule, RealAudio feed. (a service of Brigham Young University)
Meta Description: [ BYU Broadcasting: A Division of the BYU College of Fine Arts and Communications featuring Brigham Young University programming. ]

KDFC -- Classical 102.1 - San Francisco Bay Area's own KDFC, classical radio at 102.1 FM.

KFUO-FM 99.1: Classic 99 - Classical music in St. Louis Missouri, online listening available. A radio ministry of The Lutheran Church-Missouri Synod.

KING-FM - (Seattle, WA) Includes RealAudio feed.

KMFA - 89.5 - (Austin, TX) classical music; guide to classical Austin.

KUSC 91.5 FM - Southern California public radio station featuring classical music 24 hours a day. Live streaming, music playlists, membership and station information.

KWAX 91.1 FM - (Eugene, OR: non-commercial) all classical music (from the University of Oregon)

Lyric 96-99 FM - (Ireland) RTE's Arts and Music service; classical, jazz, traditional, world music and opera; live internet stream.

MTM Radio - Internet radio station devoted to contemporary classical, from 1900-today.Also experimental music (free jazz, electronic, improvisation, alternative djs and more).
Meta Description: [ MTM Radio, station consacrée aux musique du dernier siècle: musique classique, musique contemporaine (incluant la musique électroacoustique) et musique actuelle (jazz libre, improvisation,électronique,recherche sonore). ]

Naxos Web Radio - 50+ Channels of Classical Music. Commercial Free. Free Demo Version. US$9.95 Per Year

OperadiO.com - Offers seven live audio streams featuring opera and classical music.

Radio Swiss Classic - Classical Music Radio Station broadcasting from Switzerland 24 hours a day.
Meta Description: [ Radio Swiss Classic. Musikspartenprogramm der SRG SSR idée suisse. ]

WBACH: WBQQ FM 99.3/106.3/106.9 - 3 stations covering Maine

WCLV 95.5 FM - (Cleveland, OH: commercial)

WCPE, Classical Station - Listener-supported, commercial-free, great classical music, 24-hours a day. Streaming in 5 formats, and via C-band satellite, cable systems and affiliate radio stations.
Meta Description: [ WCPE, TheClassicalStation.org, plays Great Classical Music 24 hours a day on 89.7 FM in North Carolina, across North Ameria via satellite, and worldwide on the Internet. ]

WCRB 102.5 FM - (Boston)
Meta Description: [ Boston Classical Radio 102.5 FM - Your resource to make your life a classic. Classical facts and anecdotes, Arts and Entertainment, Contests, Lifestyles guide: restaurants, wine and food, travel, real estate, pets. ]

WCVE 88.9FM - Public broadcasting station serving central Virginia.

WFMR - 98.3 FM - Classical Radio for Milwaukee and the World

WGMS 104.1 - Washington's Classical Station
Meta Description: [ WGMS 104.1, Washington's Classical Music Station. ]

WKSU-FM - Classical music and in-depth news (NPR and local), with folk music on weekend evenings. RealAudio feed.
Meta Description: [ NPR. Classical. Other smart stuff. Classical music and NPR, with folk music on weekend evenings. Listen live or on-demand with RealAudio. ]

WQED 89.3 FM - (Pittsburgh, PA) Radio schedule, Pittsburgh concert schedule, RealAudio feed.

WQXR 96.3 FM - The classical music station of The New York Times. Live streaming audio available.

WUOL 90.5 FM - (Louisville, KY) a service of the University of Louisville and the Public Radio Partnership.

WXXI 91.5 FM - (Rochester, NY) RealAudio feed.

XLNC Classical Music - RealAudio feed.