. The principles underlying radio communication . Connections for usina electrontube as a simple detector Fig. 266I Voltage oscillations impressed en the grid,i Resulting variations in plate Corresponding fluctuathns of telephone. currents- /Action of electron tube as detector If the grid battery voltage is adjusted so that the plate cur-rent has a value near the upper bend of the curve showingplate current plotted against grid voltage, instead of near thelower bend, the action will be essentially the same, but theeffect of the arrival of a wave train will be to decrease mo-menta
. The principles underlying radio communication . Connections for usina electrontube as a simple detector Fig. 266I Voltage oscillations impressed en the grid,i Resulting variations in plate Corresponding fluctuathns of telephone. currents- /Action of electron tube as detector If the grid battery voltage is adjusted so that the plate cur-rent has a value near the upper bend of the curve showingplate current plotted against grid voltage, instead of near thelower bend, the action will be essentially the same, but theeffect of the arrival of a wave train will be to decrease mo-mentarily the plate current instead of to increase it. As be-fore, there will be fluctuations of the plate current keepingtime with the arrival Qf wave trains, and there will be a soundin the telephone of a pitch corresponding to the number of wavetrains per second. Care must be taken in the use of receiving tubes that theplate battery voltage is never high enough to cause the visible blue glow referred to in Section 188. The tube becomes very DETECTOR ACTION. 475 erratic in behavior \\-lieii in this condition and is very uncer-tain and is not sensitive as a receiver. This is because theplate current becomes so large tliat it is unaffected b
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
