Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

264 FREQUENCY MODULATION, Volume I-MliK-OUTFig. 7—Breakout characteristic.oscillator may then suddenly jump to a series of different frequencyratios such as, 36/7, 41/8, 46/9 • • • • •5/1, • • , 44/9, 39/8, 34/7, • • •• •for short intervals. The lock-in range for each of those ratios is verysmall, and the oscillator breaks out between them. The result can bea distorted output as shown by Figures 7 or 8. It is, therefore, necessaryto provide adequate lock-in range in order to prevent this distortion.Factors Which Determine The Lock-in KangeThe iock-in range of the oscillator depends upon several factorswhich will now be discussed.Effect of DiscriminatorWhen a discriminator is connected to the oscillator, it changes theimpedance relations of the tank circuit and increases the lock-in range.Fig. 8—Breakout characteristic.