. Elements of radio telephony . msmmmsu foanfenna -—HT^nSW Fig. 25.—Transmitting tube arranged for grid circuit modulation. culty due to the tube stopping oscillation entirely. Whenthe voltage of the secondary of the modulation transformermakes the grid negative, the output is reduced but not pro-portionately. There seems to be a point of instabihty whichwhen reached stops the tube oscillation instead of merelyreducing it. This causes very poor modulation and isdifficult to avoid if complete modulation is desired. 54 ELEMENTS OF RADIO TELEPHONY The value of the condenser Cg plays an important
. Elements of radio telephony . msmmmsu foanfenna -—HT^nSW Fig. 25.—Transmitting tube arranged for grid circuit modulation. culty due to the tube stopping oscillation entirely. Whenthe voltage of the secondary of the modulation transformermakes the grid negative, the output is reduced but not pro-portionately. There seems to be a point of instabihty whichwhen reached stops the tube oscillation instead of merelyreducing it. This causes very poor modulation and isdifficult to avoid if complete modulation is desired. 54 ELEMENTS OF RADIO TELEPHONY The value of the condenser Cg plays an important part inthe proper adjustment and should be varied by trial for bestresults. It is difficult to maintain this system in adjustmentas variations of plate voltage, filament current, antennaconstants, etc., all seem to require compensating readjust-ments. CHAPTER VI RECEIVING EQUIPMENT Tuning.—If one will depress the loud or damper pedalon a piano and sing some tone of constant pitch while thepedal is down the set of strings
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradio, bookyear1922
