Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

240 FREQUENCY MODULATION, Volume Inoise reduction over column 1.This can be made clear by referring toFigure 8.Frequency Spectrum of Certain PulsationsIn Figure 8 several forms of pulsation are shown with the correspondingenergy distribution curves. The first pulsation is called "unitNo Li miterPlate VoltageLimiterGrid LeakLimiterFig. 7—Oscillograms illustrating noise reduction by plate voltage and gridleak limiters.step." The corresponding distribution curve has its amplitude inverselyproportional to the frequency.If the first derivative of the unit step is taken the result is calledunit impulse. It is supposed to have infinite amplitude and zero time