VHF


VHF
Also, vhf, V.H.F.

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      conventionally defined portion of the electromagnetic spectrum including any radiation with a wavelength between 1 and 10 metres and a frequency between 300 and 30 megahertz. VHF signals are widely employed for television and radio transmissions. In the United States and Canada, television stations that broadcast on channels 2 through 13 use VHF frequencies, as do FM radio stations. Many amateur radio operators also transmit on frequencies within the VHF band.

      VHF waves, unlike longer waves, are not strongly reflected from the atmosphere; therefore, they do not bend readily around the Earth's curvature and cannot be transmitted beyond the horizon. Their range is further limited by their inability to pass through hills or large structures. Accordingly, VHF waves are limited to use in short-range, line-of-sight communications, including radio and television broadcasting, and in electronic navigation systems. They are especially suited to such applications because their reception is not impaired by random electromagnetic noise (“static”) of longer wavelengths. Because of their limited transmission range, VHF signals of the same frequency can be used by transmitters several hundred miles apart without interfering with one another. See also UHF.

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Universalium. 2010.

Look at other dictionaries:

  • VHF — (el. vhf) (fork. for very high frequency) …   Dansk ordbog

  • vhf — (el. VHF) (fork. for very high frequency) …   Dansk ordbog

  • VHF — or vhf abbrev. very high frequency …   English World dictionary

  • VHF — sigla ES ingl. Very High Frequency, altissima frequenza …   Dizionario italiano

  • VHF — [ˌvi: eıtʃ ˈef] n [U] technical very high frequency radio waves that move very quickly and produce good sound quality …   Dictionary of contemporary English

  • VHF — [ ,vi eıtʃ ef ] noun uncount very high frequency: a range of radio waves that produces good sound quality …   Usage of the words and phrases in modern English

  • VHF — 1932, acronym of very high frequency …   Etymology dictionary

  • VHF — (very high frequency) n. range of radio frequencies between 30 and 300 megahertz …   English contemporary dictionary

  • VHF — DEFINICIJA krat. tehn. područje elektromagnetnih frekvencija koje se koriste za emitiranje (radiovalovi od 30 do 300 Hz); vrlo visoka frekvencija, usp. UHF ETIMOLOGIJA engl. Very High Frequency …   Hrvatski jezični portal

  • VHF — ► ABBREVIATION ▪ very high frequency …   English terms dictionary

  • VHF — Très haute fréquence La bande des très haute fréquence (very high frequency/VHF) est la partie du spectre radioélectrique s étendant de 30 MHz à 300 MHz, soit de 1 à 10 m de longueur d onde. Sommaire 1 Propriétés générales 2 Alloc …   Wikipédia en Français


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