(a) a wave in three dimension (as opposed to one confined to a plane or a surface); (b) Radio a radio wave that passes from a transmitter to a…
| 单词 | θ197905 |
| 释义 | society > communication > telecommunication > radio communications > [noun] > radio wave > types of (8) space wave1899 (a) a wave in three dimension (as opposed to one confined to a plane or a surface); (b) Radio a radio wave that passes from a transmitter to a… surface wave1913 Radio. A radio wave that travels close to the surface of the earth, propagated chiefly by interaction with the surface. CW1920 continuous wave. beam1924 Radio Communication. In full radio beam, wireless beam: radio waves transmitted as a beam, i.e. undispersed, from a special aerial system, part… sky wave1924 a radio wave reflected back towards the earth's surface by the ionosphere; cf. ground wave n. at ground, n. compounds 2a. ground wave1927 the radio wave that passes from a transmitter to a receiver other than by reflection from the ionosphere, comprising one or more of the direct… tweek1933 A type of whistler which is heard as a short, high-pitched chirruping noise. Subcategories:— used to guide aircraft or missiles (1) |
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