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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 ]

Old Time Radio :: Formats
Vacuum Tubes :: Components
Antique Recording Technologies :: Audio
Jukeboxes :: Audio
Nipper :: Famous Dogs
Boatanchors :: Amateur
Radios :: Antiques and Collectibles

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Hairy Blair (you better get well) by MULCHEFYE now playing on http://bit.ly/ukrock - RockAffairs Radio [05:46:48] #unsigned #music
varjankim (varjankim) Sat, 07 Nov 2009 14:30:58 -0000
Hairy Blair (you better get well) by MULCHEFYE now playing on http://bit.ly/ukrock - RockAffairs Radio [05:46:48] #unsigned #music
Bloodlines by Voodoo Down now playing on http://bit.ly/ukrock - RockAffairs Radio [05:46:48] #unsigned #music
varjankim (varjankim) Sat, 07 Nov 2009 14:30:57 -0000
Bloodlines by Voodoo Down now playing on http://bit.ly/ukrock - RockAffairs Radio [05:46:48] #unsigned #music
Cold On Ice_320Kbps by Manolis Moumouzias; Lakis Kallianides now playing on http://bit.ly/ukrock - RockAffairs Radio [05.. #unsigned #music
varjankim (varjankim) Sat, 07 Nov 2009 14:30:56 -0000
Cold On Ice_320Kbps by Manolis Moumouzias; Lakis Kallianides now playing on http://bit.ly/ukrock - RockAffairs Radio [05.. #unsigned #music
@AlexAllTimeLow Hey, They played your song here in the Philippines. I heard it on the radio, Damned if I do ya. I screamed when i heard it!
heynixmix (★Nicole Rivera) Sat, 07 Nov 2009 14:30:55 -0000
@AlexAllTimeLow Hey, They played your song here in the Philippines. I heard it on the radio, Damned if I do ya. I screamed when i heard it!
Work from Home - Help Wanted (Radio Advertising Sales and Syndication: Help Wanted (Radio Advertising Sales and.. http://bit.ly/3LxkPl
workfromhomeorg (Work-from-home.org) Sat, 07 Nov 2009 14:30:49 -0000
Work from Home - Help Wanted (Radio Advertising Sales and Syndication: Help Wanted (Radio Advertising Sales and.. http://bit.ly/3LxkPl
Pandora Internet Radio - Find New Music, Listen to Free Web Radio http://bit.ly/BJGcG
delicious50 (Delicious Over 50) Sat, 07 Nov 2009 14:30:45 -0000
Pandora Internet Radio - Find New Music, Listen to Free Web Radio http://bit.ly/BJGcG

 

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Ad*Access - The Radio and Television subcategories, with a large collection of vintage print advertisements dating from the '20s to the '50s. Each image is scanned in color, at 72 and 150 dpi resolutions, and they give information about the source publication.

Antique Radio Classified - Link to the world of antique radio collecting, its activities, and the publication and products of Antique Radio Classified. Covers old radio, TV, telegraph, amateur/ham radio, high fidelity/hi-fi audio.

Antique Radio Page - Don Adamson's photo galleries and information on sets from the 1920s to the 1960s. Informative articles include one on how to build a linen diaphragm speaker.

Antique Radio Webring - Web sites about collecting, buying, selling, and trading vintage and antique radios.
Meta Description: [ Vintage and antique radios, collecting, buying, selling and trading. ]

Antique Radios Online - A site for collectors and restorers of vintage and collectible radios. On-line forums, resources, and chat, supported by a dedicated and experienced membership.

Atwater Kent Radio - A collection of pictures of AK radios, advertisements, brochures, operating manuals, and a profile of the company founder.

Gollum's Crystal Receivers - The history and theory of crystal receivers. Vintage and modern kits, pictures, and links.

NJ7P Tube Database - Base diagrams, characteristics, and outlines for thousands of vacuum tubes, provided by Bill Beech's Ham Radio Server.

Nostalgia Air - Large free online resource for antique and vintage radios, with over fifty thousand pages of scanned Riders schematics, service manuals, tube cross reference, articles, and forums.

Philco Simplex Radio History - Features a brief profile of the company formerly located in Sandusky, Ohio. Includes photos of the plant site and a few models from the production line.
Meta Description: [ A brief history of the Simplex Radio Company and Philco Radio and Television in Sandusky, Ohio ]

Radio Boys - An article by James D. Keeline about the series of juvenile novels written by several ghostwriters under the pen name of Allen Chapman and others in the 1920s. Includes images of original covers.

Radiobau-Zehetner - Austrian radio history, with a profile of Eng. Franz Zehetner (1907-1986) and his radio and television products, with photographs and advertising copy. [Mostly German, but with some English text]

RNW Antique Radio - Links to antique and old-time radio sites throughout the world, compiled by Radio Netherlands.

Silver, Sounds, and Stuff - An archive of over 1000 photos of antique radios, information on future and past club meetings and auctions, and reference material for repairing old sets.

The Philco Repair Bench - Chuck Schwark provides many resources for the Philco radio collector and restorer, ranging from parts cross-references, to service information on some of the more obscure features such as the Beam-Of-Light tonearm pickup, and an identification guide for early cathedral models.
Meta Description: [ Welcome to the Philco Repair Bench! Here you'll find many resources for the Philco radio collector and restorer. ]

The Rise of the Bakelite and Catalin Radio in the US During the 1930s - A text-only article by Louis Vloedbeld on the background and development of bakelite and catalin radio designs.

TransOceanic Resource Library - Photos, schematics, alignment data, model specs, and a directory of links for Zenith TransOceanic Long Distance radios.

Vintage Radio and Audio Pages - Brian McAllister's restoration resources, in the form of high-resolution GIF images of service notes and schematics for many radios, audio amplifiers and preamplifiers, phonos, and tuners. He has a special section for several German radios (Grundig and Telefunken).

Vintage Radios and Programs - Resource for collectors and fans of antique radios, military surplus radios, tube radios, valve radios, Collins, Atwater Kent, Hammarlund, Hallicrafters and Crosley radios, and telegraph key collections. Stars and programs from the golden days of radio are featured.
Meta Description: [ Vintqage radios and shows ]

Worldwide Vintage Wireless Database - Mainly UK and North American sets from the 1920s to the 1960s. Picture galleries include thousands of photographs of radios, devices (valves or tubes) and device boxes.
Meta Description: [ This section of the Martin Francis web site is dedicated to UK and North American Vintage wireless from 1920's to the 1960's. Picture galleries include 2000+ photographs of radios and valves / tubes. ]