. The Bell System technical journal . 104KC ^ 140 150 160 170Eb IN VOLTS(B) -35 -30 -25 -20 -15 -10 -5 0 5 10 4-KILOCYCLE INPUT IN DECIBELS ABOVE I MILLI-WATT (C) Fig. 4—Performance curves of channel harmonic generator. {A) Harmonicoutputs; {B) Variation of 16th and 26th harmonics with ampUfier plate potential;(C) Variation of 26th harmonic with fundamental Fig. 5—Construction of experimental non-linear coils used for harmonic generation,showing core forms, magnetic tape, wound coils, and assembled units. MAGNETIC GENERATION OF A GROUP OF HARMONICS 443 the harmonic output corresponding
. The Bell System technical journal . 104KC ^ 140 150 160 170Eb IN VOLTS(B) -35 -30 -25 -20 -15 -10 -5 0 5 10 4-KILOCYCLE INPUT IN DECIBELS ABOVE I MILLI-WATT (C) Fig. 4—Performance curves of channel harmonic generator. {A) Harmonicoutputs; {B) Variation of 16th and 26th harmonics with ampUfier plate potential;(C) Variation of 26th harmonic with fundamental Fig. 5—Construction of experimental non-linear coils used for harmonic generation,showing core forms, magnetic tape, wound coils, and assembled units. MAGNETIC GENERATION OF A GROUP OF HARMONICS 443 the harmonic output corresponding are but little affected by change ofinput amplitude. With a linear amplifier the harmonic output currentwould vary roughly as the four-tenths power of the input current. Another application involving higher frequencies has been made tothe generation of the so-called group carriers used in conjunctionwith a coaxial conductor.^^ There odd harmonics of 24 kc. from the9th to the 45th are used. The circuit differs from Fig. 1 in that thecopper oxide bridge is omitted, and the non-linear coil is provided withtwo windings to facilitate impedance matching. The performance ofan experimental model is similar to that of the generator describedabove. A notion of the physical size and construction of the non-linear coils used may be had from the photographs of Fig. 5
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
