| 单词 | night effect |
| 释义 | > as lemmasnight effect night effect n. irregularity of the strength and direction of received radio waves of certain frequencies that is especially marked at night, owing to the reception of polarized waves reflected by the ionosphere; an instance of this. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > signal > obstruction or poor reception blind spot1864 screening1902 fading1912 night effect1914 night error1921 wipeout1921 skip1925 radio fade-out1927 fade-out1937 1914 R. Stanley Text-bk. Wireless Telegr. x. 114 The difference between day and night effects on the transmitted ether energy might possibly be caused by a change in the position of the upper conducting layer of atmosphere. 1932 F. E. Terman Radio Engin. xvi. 591 Since the sky wave is always strongest at night the errors that result from downcoming horizontally polarized waves are frequently referred to as ‘night effects’ although they are always present to some extent in daytime. 1988 M. Agazarian Instrument Flying (BNC) 75 Night Effect causes serious bearing errors and interference between stations. < as lemmas |
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