Image from page 516 of "The principles underlying radio communication" (1922)
Publisher: Washington, Govt. Print. Off.
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vFig.Zou.J-lntenna Current \\in.Radiotelephony Transmittingthe]\3ound of a*as in father \) Modulated Radio- frequencyWave which can be received with Simple Detector
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Tig287 Jlntenna Current in Radiotelephony Transmittingthe Sound of a as in father. Radio-frequency Wave soModulated that Beat Reception is Required. 53904°—22- -33 511 £12 ELECTRON TUBES. upper and lower boundaries of the modulated wave were pushedtoward the zero axis so that the points b, b just touch the zeroaxis. In the circuits commonly used in radiotelephony, if theamplitude of the modulating audio frequency becomes too greatthe radio-frequency oscillations entirely cease during a consid-erable portion of the cycle, and a marked distortion of speechoccurs; this is called overmodulation. Tbe effect of overmodulation in an electron tube radiotele-phone transmitting set is similar to the effect during part ofthe cycle in an electron tube generating set having plate supplyof sine wave alternating current of perhaps 800 cycles. Thewave form for such a generating set is shown in Fig. 283, page500. During the intervals when the plate voltage is negative,the radio-frequency oscillati
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