Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

306 FREQUENCY MODULATION, Volume Iof inductive and capacitative coupling between the tube and the tunedcircuit.The capacitance measurements were made by observing the detuningwith the Q-meter's calibrated condenser.In the measurements for varying conditionsof transconductance,i.e. bias voltage, the parameter measured was the plate current. Thiswas done because plate current is nearly proportional to transconductance,the variable of interest, and readily measured.No attempt was made to operate the tubes at plate and screenvoltages other than the typical operating conditions given in Table 1.