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Publication of BE471441ApublicationCriticalpatent/BE471441A/xx
H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
H03J7/02—Automatic frequency control
H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal