| 单词 | medium wave |
| 释义 | > as lemmasmedium wave medium wave n. Telecommunications a radio wave with wavelength between a hundred metres and a kilometre (see quot. 1929 for former limits); a waveband including such wavelengths; frequently attributive (usually with hyphen). ΘΚΠ society > communication > telecommunication > radio communications > [noun] > radio wave > length of > specific short wave1839 medium wave1928 MW1938 long wave1965 1928 Wireless World 7 Nov. 626/2 It will..be best to concentrate on maximum efficiency in medium-wave transformers. 1929 Jrnl. Inst. Electr. Engineers 68 22/2 The definitions were fixed as follows [by the International Radio Technical Committee]... Medium waves: kilocycles/sec 1500 to 100; m 200 to 3000. 1938 D. H. Surgeoner Aircraft Radio iii. 23 Medium waves are..suitable for both communications and direction-finding and these can be transmitted over reasonable distances. 1961 Radio Times 6 Apr. 9/1 The Network Three transmitters, both medium-wave and VHF, will be used for one channel. 1974 Encycl. Brit. Macropædia III. 311/1 Long waves range from 30 to 300 kilohertz; medium waves from 300 kilohertz to 3 megahertz; and short waves from 3 to 30 megahertz. 1992 Economist 2 May 22/3 Better programmes..must be delivered on the better wavebands—medium wave or FM—that East Europeans want to listen to. < as lemmas |
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