radio frequency


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Related to radio frequency: Radio Frequency Identification, Radio waves

See also: Radio Frequencies (table)Radio Frequencies
Frequency
(kHz)
Name Abbr.
10–30 Very low VLF
30–300 Low LF
300–3,000 Medium MF
3,000–30,000 High HF
30,000–300,000 Very high VHF
300,000–3,000,000 Ultra high UHF
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radio frequency,

range of electromagnetic waves with a frequency or wavelength suitable for communication uses. Some of these waves serve as carriers of the lower-frequency audio waves; others are modulated by video or digital information. Short waves have relatively high frequencies; long waves have relatively low frequencies. Radio waves are identified by their frequencies, expressed in kilohertz (kHz), i.e., thousands of cycles per second, in megahertz (MHz), i.e., millions of cycles per second, or in gigahertz (GHz), i.e., billions of cycles per seconds. A range, or band, of radio frequencies is assigned to a broadcasting service by the nation in which it operates. In the United States, the Federal Communications CommissionFederal Communications Commission
(FCC), independent executive agency of the U.S. government established in 1934 to regulate interstate and foreign communications in the public interest.
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 is responsible for that task. Signals in the amplitude modulation (AM) broadcast band in the Americas have frequencies ranging from 530 to 1,700 kHz. Frequency modulation (FM) broadcast frequencies in most countries range from approximately 88 MHz to 108 MHz. Other frequencies are assigned to amateur (ham) radio, citizen band (CB) radio, television broadcasting, cellular telephones, global positioning systems, and other uses. Countries cooperate on on a worldwide basis through the International Telecommunication UnionInternational Telecommunication Union
(ITU), specialized agency of the United Nations, with headquarters at Geneva. It was created in 1934 as a result of the merging of the International Telegraph Union (est.
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, which holds periodic conferences. See also the table entitled Radio FrequenciesRadio Frequencies
Frequency
(kHz)
Name Abbr.
10–30 Very low VLF
30–300 Low LF
300–3,000 Medium MF
3,000–30,000 High HF
30,000–300,000 Very high VHF
300,000–3,000,000 Ultra high UHF
..... Click the link for more information.
 for the classification of radio frequencies.

radio frequency

See radio waves.

radio frequency

[′rād·ē·ō ‚frē·kwən·sē]
(electromagnetism)
A frequency at which coherent electromagnetic radiation of energy is useful for communication purposes; roughly the range from 10 kilohertz to 100 gigahertz. Abbreviated rf.
References in periodicals archive ?
Acquiring a radio frequency assignment is an iterative process with periodic reassessment of spectrum requirements to incorporate changes in the electromagnetic environment.
Why not do a quarterly radio frequency radiation leakage test right now?
This is the first time we're using Radio Frequency Identification tags for an actual deployment and the first time we're actually tagging every piece of equipment moving out," said Jacang.
takes advantage of a specialized industrial product line of radio frequency devices, adapted by Motorola Corp.
The EPCglobal Network combines Radio Frequency Identification (RFID) technology, existing communications network infrastructure, and the Electronic Product Code[TM] (a number for uniquely identifying an item) to enable accurate, cost-efficient visibility of information in the supply chain.
Regrettably, this allocation and assignment policy restricts the efficient use of spectrum by limiting the use of a given radio frequency to a specific person, organization and/or purpose.
During the ceremony, Estevez cited the implementation of radio frequency identification in March 2005 to support Marine Corps Forward Operating Bases in Iraq.
A new "vehicle immobilizing" security system, which will be included on 1994 Ford cars arriving at European dealerships this month, uses Texas Instruments Registration and Identification System (TIRIS(TM) radio frequency identification (RFID) technology to foil would-be thieves.
PITTSBURGH -- Mobile Aspects announced today that the Department of Perioperative Services at NewYork-Presbyterian Hospital/Weill Cornell Medical Center has expanded their use of the iRISupply[TM] clinical resource management system to manage medical devices and supplies through radio frequency identification (RFID) technology.
Because of this radio frequency characteristic, radio frequencies can be shared and reused worldwide.
That's why, beginning in January 2005, the Defense Department wants its suppliers to start using radio frequency identification technology for shipping containers, said Alan Estevez, deputy under secretary of defense for supply chain integration, at the National Defense Transportation Association's annual conference.

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