. The thermionic vacuum tube and its applications . High FrequencyChoke. Fig. 193. frequency currents in the output coils, therefore, flow in oppositedirections and the output in the secondary of the transformer Tois zero. But if the audio frequency voltage is impressed as indi-cated at L. F., the grid of the one tube becomes positive whenthe other becomes negative so that the resistance of the one tubeis reduced while that of the other is increased. This causes anincrease in the amplitude of the high frequency currents flowingthrough the one tube and a decrease in the amplitude of thoseflowin
. The thermionic vacuum tube and its applications . High FrequencyChoke. Fig. 193. frequency currents in the output coils, therefore, flow in oppositedirections and the output in the secondary of the transformer Tois zero. But if the audio frequency voltage is impressed as indi-cated at L. F., the grid of the one tube becomes positive whenthe other becomes negative so that the resistance of the one tubeis reduced while that of the other is increased. This causes anincrease in the amplitude of the high frequency currents flowingthrough the one tube and a decrease in the amplitude of thoseflowing through the other tube. In this way, therefore, energyis radiated only during the time that the tube is actuated by the 1 British Patent 130219, 1918. DETECTION OF CURRENTS WITH THE VACUUM TUBE 325 speech voltage. What is transmitted then is only the wavesgiven by the second tcnn of equation (11). 100. Detection. The mechanism of detection is identicalwith that of modulation and is due to the same cause, namely,the curvature of the characteristic. In general, theref
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