Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

8 FREQUENCY MODULATION, Volume Iin which o> na = (co — co„) = 2t(F c— F n ) = 2wF na.Equation (6) gives the instantaneous frequency of the resultantwave consisting of the signal wave and the noise resultant voltage.From this equation the signal and noise frequency deviations may beobtained. In order to determine the over-all transmission with respectto the various components in the noise spectrum, a single componentof noise, with constant amplitude and variable frequency, will besubstituted for the resultant noise voltage given by (4). This makesN equal to n, which is not a function of time, and {t) equal to zero.Making these changes in (6) givesS- r.-r.**»-(F na — F d sin pt)c;!— (7)Fi ,+ cos \w