| 单词 | permeability tuning |
| 释义 | > as lemmaspermeability tuning permeability tuning n. Electronics tuning in which the resonant frequency of a circuit is changed by moving a magnetic core into or out of a coil forming part of the circuit, so as to change its inductance. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > operation of electronic devices > [noun] > tuning tuning1899 permeability tuning1933 stagger tuning1953 slug tuning1957 1933 W. J. Polydoroff in Proc. IRE 21 694 The apparent inductance is increased to tune to lower frequencies by introducing a magnetic core into the field of the coil. As the core is inserted into the coil, more lines of the magnetic field are intercepted by the core, and, in effect, the average apparent permeability of the medium surrounding the coil increases from 1 (for air) to a certain maximum... For this reason, and for other reasons.., it is appropriate to describe this method as ‘Permeability Tuning’. 1968 Radio Communication Handbk. (ed. 4) iv. 35/2 Although permeability tuning has been most successfully used for many years by one major American company, the mechanical and electrical complications involved in band-switched receivers have resulted in little progress in this field by amateur constructors. < as lemmas |
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