Metro waves (MV) - a range of radio waves with a wavelength of 10 to 1 m , which corresponds to a frequency of 30 to 300 M Hz ( very high frequencies , VHF ; English very high frequency, VHF ) [1] . An integral part of an extensive range of radio waves, called ultrashort waves in the USSR .
Content
Features
Meter waves over distances of several tens of kilometers. The propagation characteristics of meter waves substantially depend on the terrain and the type of underlying surface. The influence of the Earth’s atmosphere is expressed in the scattering of meter waves by weak inhomogeneities of the ionosphere and troposphere , the reflection of meter waves from ionized traces of meteors (see Meteor radio communication ) and artificially ionized regions in the atmosphere, which leads to long-distance (up to 2 thousand km ) propagation of meter waves .
Application
Meter waves are widely used in technology for the following purposes:
- radio communication ;
- radar ;
- television
- broadcasting .
Notes
Links
- Meter waves // Great Soviet Encyclopedia : [in 30 vol.] / Ch. ed. A.M. Prokhorov . - 3rd ed. - M .: Soviet Encyclopedia, 1969-1978.