| 释义 |
neutrodyne Radio.|ˈnjuːtrəʊdaɪn|
[f. neutro- (taken as repr. neutralize, -ization) + -dyne.]
A type of high-frequency valve amplifier in which neutralization was first employed to prevent oscillation throughout a range of frequencies. Freq. attrib.
1923Wireless World 21 Apr. 68/2 Professor L. A. Hazeltine has designed receivers in which the valve capacity coupling is neutralised. The capacity coupling is neutralised with the aid of fixed condensers, and the receivers are called by him ‘Neutrodyne’ receivers. 1924Mod. Wireless II. 590/2 In the receivers to be described here, a fixed coupling is used between the anode coil and the neutrodyne coil. 1924Moyer & Wostrel Pract. Radio viii. 124 The neutrodyne works best on an antenna but may be used on a loop. 1936R. S. Glasgow Princ. Radio Engin. ix. 256 The neutrodyne circuit was used quite extensively in broadcast receiving sets prior to the general introduction of screen-grid tubes in 1929. 1943[see neutralization 1 d]. 1964Ghirardi & Dines Radio & Television Receiver Circuitry (rev. ed.) iii. 79 A modification of the famous Hazeltine ‘neutrodyne’ circuit is perhaps the most widely used in commercial receivers that employ triodes.
Hence ˈneutrodyning vbl. n. and ppl. a., neutralizing (see neutralize v. 3 c).
1924Mod. Wireless II. 590/3 The reaction is controlled entirely by this neutrodyning condenser. 1926R. W. Hutchinson Wireless 217 Several methods have been devised for the control of this oscillation; neutrodyning, as it is termed, is one of the best. 1943C. L. Boltz Basic Radio xiv. 226 This [instability] was decreased by using condensers to provide negative feed-back to nullify the positive feed-back. These were called neutralizing condensers, and the process was one of neutralization or neutrodyning. |