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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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2009年12月5日「規範なき現代～萱野稔人×鈴木謙介」 - [ TBS RADIO 文化系トークラジオ Life http://bit.ly/6d5Jxm ]
drill_head (Yu Saeki) Sun, 27 Dec 2009 23:53:48 -0000
2009年12月5日「規範なき現代～萱野稔人×鈴木謙介」 - [ TBS RADIO 文化系トークラジオ Life http://bit.ly/6d5Jxm ]
All-Radio 3.04/2009: All-Radio - дает доступ к 2500 радиостанциям и 1200 телевизионным каналам со всех уголков .. http://bit.ly/7N3hFL
izhastro (Sergey) Sun, 27 Dec 2009 23:53:45 -0000
Al Subscribe to Radio RSS feed

Amazon Radio - Women's Music for all who color outside the lines. Heard on WPKN in Bridgeport, CT. Home to the National Women's Radio Archives, playlists, events, and women's music links.

Bonus Cup - Features music from underground female artists. Think grrl, not girl.

Eclectic Woman - The Eclectic Woman website is Charlottesville's source for women's music and events. 91.1FM WTJU every Thursday from 7-9pm.
Meta Description: [ 91.1 FM WTJU Charlottesville ]

404 Face the Music - Thursdays 8-9:30 p.m. on WCUW Worcester 91.3 FM: lesbian/feminist music program.

Female Musician - Through streaming radio,TV and web site productions The Female Musician educates,enhances and promotes women in all areas of the music business.
Meta Description: [ The Female Musician is an educational electronic music magazine, audioproduction facility, and on line community for women of all ages who seek to pursue a career in music. ]

KRCL Community Radio - Woman to Woman and The Second Decade are just two of the women's radio programs at this station based in Salt Lake City.

Satellite Sisters Radio - Radio show featuring five sisters talking about women and real life. Site includes broadcast schedule, audio excerpts, followup articles, and message boards.

Suffragette Station Online - The web home of Suffragette Station, spinning contemporary folk by women singer-songwriters on KTUH Honolulu.
Meta Description: [ The internet home of Suffragette Station, spinning the best in contemporary folk by women singer-songwriters on KTUH Honolulu. ]

The Estrogen Zone - Internet broadcast dedicated to independent female musicians. Over 100 different artists, such as Lori McKenna, Sister Seven, Kristie Stremel, Beth Orton, Sleater Kinney, Meghan Toohey.

The Women's Independent Music Show - Showcases women's music, especially the independent female artist. Hosted by Diane Ward.
Meta Description: [ W.I.M.S. is a weekly internet radio show that showcases women's music from around the world, especially independent music artists.  Hosted by Diane Ward, one of South Florida's best singer/songwriters. ]

Women in Music with Laney Goodman - Weekly, one-hour radio series with an eclectic mix of the best music of female artists from around the world.