very high frequency
range of radio frequencies between 30 and 300 megahertz
Very high frequency
Very high frequency (VHF) is the
radio frequency range from 30
MHz to 300
MHz. It is also known as the meter band or meter wave as the wavelengths range from ten to one
meters. Frequencies immediately below VHF are denoted
HF, and the next higher frequencies are known as
Ultra high frequency (UHF).Common uses for VHF are
FM radio broadcast at 88–108 MHz and
television broadcast (together with
UHF). VHF is also commonly used for terrestrial navigation systems (
VOR in particular), marine communications, and aircraft communications.VHF frequencies' propagation characteristics are ideal for short-distance terrestrial communication, with a range generally somewhat farther than line-of-sight from the transmitter (see formula below). Unlike high frequencies (HF), the ionosphere does not usually reflect VHF radio and thus transmissions are restricted to the local area (and don't interfere with transmissions thousands of kilometres away). VHF is also less affected by atmospheric noise and interference from electrical equipment than low frequencies. Whilst it is more easily blocked by land features than HF and lower frequencies, it is less bothered by buildings and other less substantial objects than higher frequencies.
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very high frequency
Noun
1. 30 to 300 megahertz
(synonym) VHF
(hypernym) radio frequency
(part-holonym) electromagnetic spectrum
very high frequency (VHF)
Frequencies from 30 MHz to 300 MHz. (
188 )
VERY HIGH FREQUENCY
The frequency band between 30 and 300 MHz. Portions of this band, 108 to 118 MHz, are used for certain NAVAIDs; 118 to 136 MHz are used for civil air/ground voice communications. Other frequencies in this band are used for purposes not related to air traffic control.