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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
Radio waves
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 |
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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Video Essay: A Look Inside the RNC Protests
MediaChannel Thu, 04 Sep 2008 18:41:00 -0000
Thousands of protesters gathered in St. Paul, Minn., the site of the Republican National Convention. As tensions mounted between those gathered and police, AP photojournalist Evan Vucci was in the middle of the crowd.
Media swoon over Palin’s fiery speech
Politico Thu, 04 Sep 2008 18:30:42 -0000
By Michael Calderone, PoliticoNBC political director Chuck Todd, weighing in shortly after Sarah Palin's fiery speech before the Republican faithful, declared: "Conservatives have found their Obama."
McCain camp blames media for Palin controversy
Reuters Thu, 04 Sep 2008 18:21:49 -0000
By Paul J. Gough, ReutersThe McCain campaign came out swinging against the media over the controversy and coverage swirling around vice presidential candidate Sarah Palin.
AlterNet.org
Palin Fails by Her Own Standards
Steven Rosenfeld, AlterNet Thu, 04 Sep 2008 00:00:01 -0700
Palin went on attack Wednesday night, deriding Democrats, mischaracterizing Obama and insulting Americans, who she must think won't know any better.
A Swarm of Lobbyists Would Run McCain's White House
Jim Hightower, Hightower Lowdown Mon, 01 Sep 2008 00:00:01 -0700
McCain has already assembled his clique of advisors, and they don't have our best interests in mind.
Readers Write: What the Palin Pick Means for America
Tana Ganeva, Isaac Fitzgerald, AlterNet Thu, 04 Sep 2008 00:00:01 -0700
AlterNet readers weigh in on McCain's pick of Gov. Sarah Palin, the many skeletons in her closet, and what it all means for the country.
Americans for Radio Diversity - Home of ARD: activists and supporters of community-based and micropower radio. Actively petitions the FCC to make changes; the latest radio news, email announcement list and discussion board
Alternative Radio - A weekly one-hour public affairs radio program that provides analyses and views that are ignored or distorted in most media.
Meta Description: [ Alternative Radio: Troubled Times. Sound Answers ]
Common Ground Radio - Common Ground--Radio's Weekly Program on World Affairs. Documentaries about a wide variety of subjects
Meta Description: [ Common Ground is a weekly radio program on world affairs produced by the Stanley Foundation since 1980. ]
Flashpoints Radio - (Produced at KPFA, Berkeley) Hard-hitting daily investigative news magazine. Site includes audio archive of recent shows.
LUVeR Alternative News - RealAudio newscast covering social, cultural, political, and personal [r]evolution that the corporate media actively supresses.
National Radio Project - Non-profit organization committed to investigative journalism, analysis, civic participation. Produces Making Contact radio program available online. Also attempting yo develop national alternative distribution system for radio.
Meta Description: [ National Radio Project is an independent, non profit media organization that produces Making Contact, a public affairs radio program covering a variety of social justice, political and environmental issues. National Radio Project trains emerging journalists, heightens public consciousness, broade... ]
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Partytown - MP3 streaming online broadcasts with music, comedy, and news and resources about grassroots media activism.
Radio Free Europe/Radio Liberty - Radio Free Europe / Radio Liberty is an international news and broadcast organization providing alternative points of view, serving Central and Eastern Europe, the Caucasus and Central Asia.
Save Pacifica - News and information from organization opposed to current policies and actions of Pacifica Radio foundation board.
Meta Description: [ SavePacifica - Restoring Pacifica as a democratic voice of the people! Committed to governance by the community, for the community! Rehire Nicole Sawaya! Bring back Larry Bensky! End the gag rule! ]
Steel on Steel - News, commentary, interview, and debate. An alternative web radio information source for politics, religion and global events. With Host John Loeffler.
Meta Description: [ Steel On Steel provides and alternative media forum for the discussion of news, politics religion and current events. ]
| On the radio today, was a lot of gossip about Sarah Palin and her youngest. They had un-substantiated rumor. My thought ... | |
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