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RF waves (low-frequency waves)

См. также в других словарях:

  • Low frequency — or LF refers to Radio Frequencies (RF) in the range of 30 kHz ndash;300 kHz. In Europe, and parts of Northern Africa and of Asia, part of the LF spectrum is used for AM broadcast service. In the western hemisphere, its main use is for aircraft… …   Wikipedia

  • Low-frequency oscillation — The term low frequency oscillation (LFO) is an audio signal usually below 20 Hz which creates a pulsating rhythm rather than an audible tone. LFO predominantly refers to an audio technique specifically used in the production of electronic music.… …   Wikipedia

  • Low frequency — Basse fréquence Pour les articles homonymes, voir BF et LF. La bande radioélectrique des basses fréquences ou LF (low frequency) est la partie du spectre radioélectrique de fréquence comprise entre 30 kHz et 300 kHz (longueur d onde de… …   Wikipédia en Français

  • low frequency — 1. said of any periodic event or process that recurs at a rate below a specified norm. 2. an alternating current where frequency in cycles per second is low in reference to a certain standard. 3. a frequency of sound waves that is below a certain …   Medical dictionary

  • Extremely low frequency — (ELF) is the band of radio frequencies from 3 to 30 Hz. ELF was used by the US Navy and Soviet/Russian Navy to communicate with submerged submarines.ExplanationBecause of the electrical conductivity of salt water, submarines are shielded from… …   Wikipedia

  • Very low frequency — or VLF refers to radio frequencies (RF) in the range of 3 kHz to 30 kHz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals are used, such as for radio navigation. Also known as the myriameter… …   Wikipedia

  • Ultra low frequency — The Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3 kilohertz. Many types of waves in the ULF frequency band can be observed in the magnetosphere and on the ground. These waves represent important physical processes in… …   Wikipedia

  • Super low frequency — (SLF) is the frequency range between 30 hertz and 300 hertz. This frequency range includes the frequencies of AC power grids (50 hertz and 60 hertz). The radio services Seafarer (USA) on 76 hertz and ZEVS (Russia) on 82 hertz operate in this… …   Wikipedia

  • frequency — fre|quen|cy W3 [ˈfri:kwənsi] n plural frequencies 1.) [U] the number of times that something happens within a particular period of time or within a particular group of people frequency of ▪ the frequency of serious road accidents the high/low… …   Dictionary of contemporary English

  • frequency — n. number of repetitions 1) alarming; great, high; low frequency 2) with frequency (with alarming frequency) number of periodic waves per unit of time (physics) 3) high; low; medium frequency 4) a radio frequency 5) on a frequency * * * [… …   Combinatory dictionary

  • frequency — noun 1 (U) the number of times that something happens (+ of): The frequency of mining accidents has steadily decreased over the past 20 years. | high/low frequency (=happening very often or not often): The high frequency of cases of diarrhoea is… …   Longman dictionary of contemporary English

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