The phenomenon of ultraharmonic synchronization of a class-Coscillator in response to a pure FM signal has been discussed in this paper. The variation of locking range of the oscillator with input modulation index and the influence of the time constant of the automatic biasing circuit on the locking time of the oscillator have been studied. The necessary mathematical tool has been developed and the differences between the locking characteristics of class-Cand class-Aoscillators have been pointed out. Experiments have also been performed in support of the theory developed.
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