. Operation of the modulator tube in radio telephone sets . amp. volts0.)5_I500. 90 160 ^70 360° Fig. 9.—Modulating power 450° From the condition that for all instants of time in the audio cycle the identity must be satisfied ei = Ria^ + -TXL i^) the following relations will be found; I. Either ^e must be zero or 4>i must be zero. (13) 2. If 0e=o, then k^ = ka,, 4>i= tan , ki-=ka. sec i=o, then ki=ka,, ^e= tan^ —^> fee = fea sec ^e Purington] ModulotoY Tube in Radio Telephone Sets 397 The reasons for the two possible solutions coming out of thisexpression is that nothing is specified
. Operation of the modulator tube in radio telephone sets . amp. volts0.)5_I500. 90 160 ^70 360° Fig. 9.—Modulating power 450° From the condition that for all instants of time in the audio cycle the identity must be satisfied ei = Ria^ + -TXL i^) the following relations will be found; I. Either ^e must be zero or 4>i must be zero. (13) 2. If 0e=o, then k^ = ka,, 4>i= tan , ki-=ka. sec i=o, then ki=ka,, ^e= tan^ —^> fee = fea sec ^e Purington] ModulotoY Tube in Radio Telephone Sets 397 The reasons for the two possible solutions coming out of thisexpression is that nothing is specified as to the nature of the reso-nance circuit. The quantities e and i are similarly involved inthe equation, and consequently two solutions arise, in one case ebeing in phase with 4. and of the same degree of pulsation, andin the other i is in phase with ia., and of the same degree of pul-sation. The latter case corresponds evidently to a series resonancecircuit, in which i and 4 must be of necessity the same wave form,as they are the same identical
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