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radio(-frequency) region

См. также в других словарях:

  • Radio-frequency identification — (RFID) is a technology that uses radio waves to transfer data from an electronic tag, called RFID tag or label, attached to an object, through a reader for the purpose of identifying and tracking the object. Some RFID tags can be read from… …   Wikipedia

  • Amateur radio frequency allocations — Amateur radio frequency allocation is done by national telecommunications authorities. Globally, the ITU oversees how much radio spectrum is set aside for amateur radio transmissions. Radio amateurs use a variety of transmission modes, including… …   Wikipedia

  • Radio propagation — is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. [ H. P. Westman et al, (ed), Reference Data for Radio Engineers, Fifth Edition , 1968, Howard W. Sams and Co.,… …   Wikipedia

  • Radio relics — are diffuse synchrotron radio emission found in the peripheral regions of galaxy clusters. Similar to the case of radio halos, they do not have any obvious galaxy counterpart, but their shapes are much more elongated and irregular compared to… …   Wikipedia

  • Radio 2 (Australian radio station) — Radio station name = Radio 2 region = Australia Wide frequency = 1611, 1620 and 1629 kHz AM format = Lifestyle, Sport owner = World Audio Group Limited: This article refers to the Radio 2 in Australia. For the BBC s Radio 2 see BBC Radio 2. Radio …   Wikipedia

  • radio — /ray dee oh /, n., pl. radios, adj., v., radioed, radioing. n. 1. wireless telegraphy or telephony: speeches broadcast by radio. 2. an apparatus for receiving or transmitting radio broadcasts. 3. a message transmitted by radio. adj. 4. pertaining …   Universalium

  • Frequency allocation — The electromagnetic spectrum is an aspect of the physical world which, like land, water, and air, is subject to usage limitations. Use of radio frequency bands of the electromagnetic spectrum is regulated by governments in most countries, in a… …   Wikipedia

  • Radio propagation beacon — A radio propagation beacon is a radio beacon, whose purpose is the investigation of the propagation of radio signals. Most radio propagation beacons use amateur radio frequencies. They can be found on HF, VHF, UHF, and microwave frequencies.… …   Wikipedia

  • Frequency comb — A frequency comb is the graphic representation of the spectrum of a mode locked laser. An octave spanning comb can be used for mapping radio frequencies into the optical frequency range or it can be used to steer a piezoelectric mirror within a… …   Wikipedia

  • radio spectrum — noun the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television (Freq. 1) • Syn: ↑radio frequency spectrum • Hypernyms: ↑spectrum • Part Holonyms: ↑electromagnetic… …   Useful english dictionary

  • radio and radar astronomy — Study of celestial bodies by measuring the energy they emit or reflect at radio wavelengths. It began in 1931 with Karl Jansky s discovery of radio waves from an extraterrestrial source. After 1945, huge dish antennas, improved receivers and data …   Universalium

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