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The principles underlying radio communication . of completely modulatedwaves, using 500-cycle modulation, is described in Bureau ofStandards Scientific Paper No. 381. Heterodyne or other beat reception may also be advantageouslyused, as
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. Radio-frequency amplifiers . Fig. 5.—Six-stage radio-audio-frequency amplifier. in Figure 6. A is a square tube of insulating material about one-half inch inside measurements, with a wall about one-sixteenth. Fig. 6.—Iron-core radio-frequency transformer. inch
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