Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

58 FREQUENCY MODULATION, Volume I-39-Fig. 1—Peak signal-to-noise ratio characteristics for frequency-modulationsystems using maximum frequency deviations, Fa, of 20 and 6 kilocycles,respectively. The audio band width was 5 kilocycles. The noise was internalreceiver noise and the signal-to-noise ratios were measured on an oscilloscope.Fig. 2—Root-mean-square signal-to-noise ratio characteristics for the samesystems used for Fig. 1. The signal-to-noise ratios were measured on arectifier-type meter.