| 单词 | second channel |
| 释义 | > as lemmassecond channel second channel n. Radio = image n. 10; usually attributive. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > signal > interference cross-talk1887 static1905 X1906 statics1912 click1914 jam1914 grinder1922 hash1923 mush1924 echo1928 image1928 radio echo1928 harmonic interference1929 second channel1932 1932 C. L. Boltz Everyman's Wireless xv. 309 If the tuning circuit..is not sufficiently selective it is possible to receive..a signal whose frequency differs from that of the oscillator by the fixed intermediate frequency, but in the opposite direction... Such interference..is sometimes called ‘second channel’ interference. 1940 Amateur Radio Handbk. (ed. 2) 24/2 Interference is still likely to result from an incoming signal of such a frequency as to produce the correct intermediate frequency. This is known as ‘image’ or ‘second channel interference’. 1962 B.B.C. Handbk. 130 The selectivity of the receiver is improved and this reduces ‘second channel’, alternatively called ‘image’, interference. This is generally characterized by an irritating whistle of constantly changing pitch, sometimes accompanied by unwanted morse signals and programme modulation. Much of the interference experienced in the short-wave broadcast bands is due to such image effects. 1975 G. N. Patchett Radio Servicing III. ii. 11 It is essential to remove the second channel station before it reaches the frequency-changer or mixer. < as lemmas |
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