. The Bell System technical journal . torswhich produce sharply peaked waves in general, and are not peculiarto the magnetic type. Neighboring modulation products involving the interfering com-ponent q more than once have much smaller amplitudes in normalcircumstances than the product considered above. Because of thetuning in the input mesh, interfering components far removed in fre-quency from the fundamental are greatly reduced and the mosttroublesome interference is likely to be close in frequency to thefundamental. It may be noted that where the interference is produced by amplitudemodulat
. The Bell System technical journal . torswhich produce sharply peaked waves in general, and are not peculiarto the magnetic type. Neighboring modulation products involving the interfering com-ponent q more than once have much smaller amplitudes in normalcircumstances than the product considered above. Because of thetuning in the input mesh, interfering components far removed in fre-quency from the fundamental are greatly reduced and the mosttroublesome interference is likely to be close in frequency to thefundamental. It may be noted that where the interference is produced by amplitudemodulation of the fundamental, so that two interfering componentsenter the input, the distortion produced may be approximated bydoubling the amplitudes of the side-frequencies produced by one of theinterfering components. If the disturbance is the second harmonic ofthe fundamental, the effect is nearly the same as that for constant bias,and the relations (5) may be used if h is taken as the amplitude of thesecond harmonic magnetizing Fig. 10—73rd and 74th harmonic amplitudes as functions of direct current flowingthrough non-linear coil. Ordinate is ratio of harmonic amplitude with bias indicated,to that of 73rd harmonic with zero bias. Abscissa is harmonic number multiplied bythe ratio of bias to fundamental. Dashed lines calculated from eq. (5), full linesmeasured. To illustrate the effects of bias, Fig. 10 shows the amplitudes ofthe 73d and 74th harmonics of 4 kc. as functions of the parameternQ/Hi. The agreement between measured and calculated valuesindicates that the most important effects of bias have been included inthe simple analysis. MAGNETIC GENERATION OF A GROUP OF HARMONICS 455 References 1. E. T. Z.,v. 25, p. 1100, 1904. 2. C. R., V. 152, p. 856, 1911. 3. E. T. Z., V. 32, p. 988, 1911. 4. Cantwell, Elec. Engg., v. 55, p. 784, 1936. 5. Proc. I. R. E., V. 8, p. 468, 1920. 6. EL, v. 17, p. 17, 1926, and Proc. I. R. E., v. 17, p. 629, 1929. 7. Rev.
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