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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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Amateur and CB Radio - Twitter Search

@harbonaut my 20? It's.. umm.. ok, I admit it - I never went on CB radio. Because my Dad is a radio amateur, and frowned upon such things :)
chrismcr (Chris Russell) Sat, 12 Dec 2009 22:18:55 -0000
@harbonaut my 20? It's.. umm.. ok, I admit it - I never went on CB radio. Because my Dad is a radio amateur, and frowned upon such things :)

 

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Acom - A privately owned company offering RF and audio equipment for commercial and amateur radio markets. Includes company and product information, product specifications and dealer locations.
Meta Description: [ Outstanding HF Power Products ]

Alinco, Incorporated - Radio information and product manuals, dealer locator, parts and service.
Meta Description: [ Alinco Electronics, amateur radio's value leader, sells high quality hand held and mobile transceivers ]

Ameritron - Amplifiers, antenna tuners, user manuals, photo tour, international dealer list.
Meta Description: [ Ameritron produces the best quality HF Amplifiers in the world. We have been making top quality ham radio amplifiers for over 20 years. Come look at our selection of fine products! ]

AOR U.S.A., INC. - Authority On Radio Communications, Inc. Manufacturer of receivers, frequency stabilizers, and related equipment.
Meta Description: [ AOR U.S.A., INC. ]

Barker and Williamson Antennas and Accessories - Manufacturers of the antennas and radio parts principally for the amateur market as well as military, commercial, and emergengy use.
Meta Description: [ Barker & Williamson - manufacturing military HF broadband folded dipole antenna for NVIS and ALE,  emergency HF broadband folded dipole antenna for NVIS and ALE, commercial HF broadband folded dipole antenna for NVIS and ALE, amateur HF broadband folded dipole antenna for NVIS and ALE, fiberglas... ]

Bencher Inc. - Manufacturer of amateur radio paddles, keys, antennas and filters.
Meta Description: [ Manufactures of commercial duty copystands and tripods for imaging professionals ,high quality paddles, keys and antennas for the ham radio operator. ]

Blue's Radio Stuff - Sales of a selection of Citizen Band and Ham Radio equipment.
Meta Description: [ Your 1 Stop Shop for CB Radios, HAM Radios, and CB Accessories. ]

Cushcraft Corporation - Manufacture and develop communications antennas for the amateur and commercial markets.
Meta Description: [ Cushcraft Corporation, a world leader in the manufacture and development of communications antennas has been committed to total customer satisfaction for more than four decades. Cushcraft has become the world leader in antennas for Wireless LAN, ISM band, and small cell applications. Cushcraft al... ]

Eurofrequence Dierking NF/HF-Technik - Manufacturere and supplier of radio station accessories.
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Expanded Spectrum Systems - Small electronics researcher, developer, and manufacturer located in Tampa, FL. Commercial and Amateur Radio sales and support.

F9FT - Radio amateur antenna and accessoires. Design, manufacture and selling of VHF/UHF amateur radio antennas and accessories.
Meta Description: [ présentation de la gamme d'antennes radio amateur F9FT - fiches techniques des antennes ]

FF Systems - Repeater controller products, featuring repeater controllers, digital voice recorder units, EPROMS, and manuals.

Force 12 - Manufacturer and distributor of amateur radio antenna systems and related commercial products.
Meta Description: [ Antennas and Towers ]

Galaxy Radios - Manufacturer of amateur radios, CB radios and accessories.

GAP Antenna Products, Inc. - Antennas and accessories for amateur radios. Photo and audio galleries, reviews, and list of dealers.
Meta Description: [ GAP Antenna Products, Inc., Manufactures of the Challenger, Titan, Eagle, Voyager, and the New Super C vertical HF antennas and accessories including the Quick-Tilt Mounts for the amateur radio community and more! ]

Hamtronics Inc. - Manufacturer of commercial and amateur VHF and UHF radio equipment.
Meta Description: [ Specialized VHF and UHF FM two way radio equipment for amateur and commercial radio applications. ]

Heil Sound Ltd. - Manufacturer of microphones, headsets and accessories for the amateur radio market.
Meta Description: [ microphones, a/v, audio, podcasting, amateur radio, heil, rock and roll, hall of fame ]

ICOM Worldwide - Information on ICOM products for the Amateur market.

Kenwood USA - Communications Division - Amateur Radio information, product registration and dealer locator.

Mirai Shuha Technologies LLS - Manufacturer of amateur and commercial radio station antennas, related equipment and accessories.
Meta Description: [ Mirai Shuha Technologies, LLS. Manufactured Radio Communications Equipment & Advanced Technical Services ]

N2RGA Antennas - Manufacturer of portable dual-band antennas.
Meta Description: [ N2RGA's Home of the double Zepp Antenna ]

NCG Company - Manufactures antennas, SWR meters and power supplies primarily for the Amateur Radio market.

New Communications Solutions - Designs and manufactures specialized multi-unit equipment for the amateur radio and communications markets.
Meta Description: [ New Communications Solutions designs, manufactures and sells specialized ham radio equipment to enhance the operations and capabilities of the amateur radio operator. ]

Pacific Research - Manufacturer of repeater controllers, tone panels and telephone interconnects..
Meta Description: [ Pacific Research is a manufacturer of Repeater Controllers, Repeater Tone Panels, Telephone Interconnect. Engineering services are also available from Pacific Research. ]

Pervisell Ltd. - Supplier of demodulators and related software as well as custom design and production services for electronic systems.

R. A. Kent Engineers - Designers and manufacturer of keys, paddles and bugs for transmission of Morse code and related modes.
Meta Description: [ KENT Morse Keys. Twin paddle, single paddle and hand morse keys with precision ball race bearings. Micro precision contact adjustment, available assembled or kit form. Morse code information for ham radio. ]

Spezialantennen BAZ Germany - German manufacturer of amateur antennas for UHF, VHF, and SHF.
Meta Description: [ Amateurfunk Antenne Richtantenne Richtantenne (n) Yagi Richtfunk-Antennen Duoband-Antennen Yagi -Antennen von Spezial Antennen BAZ ]

Stargun Antennas - Manufacturer and supplier of base and mobile antenna systems for HF to UHF.
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TD Communications - Specializes in amateur radio repair and service as well as fire and EMS radios.
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404 The Pouch, Inc. - Listing of ham HT radios and the pouch carrying cases which fit them. Link to amateur equipment dealers.

The Screwdriver.com - A screwdriver type mobile HF antenna capable of full legal power limit operation. Includes mount and digital controller.
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The Vibroplex Company, Inc. - Manufacturer of telegraphy keys, bugs and keyers as well as spare parts and repair service.

Tokyo Hy-Power - Manufacturer of amplifiers and related equipment for the amateur market as well as RF power products for industrial, scientific, and medical applications.

VideoLynx - Manufacturer of high performance amateur radio video transmission equipment.