Automatic scanning over a band of frequencies

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Automatic frequency control; Automatic scanning over a band of frequencies > Automatic scanning over a band of frequencies

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H03J 7/183
H03J 7/20 where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
H03J 7/30 where the scanning is accomplished by mechanical means, e.g. by a motor
H03J 7/32 with simultaneous display of received frequencies, e.g. panoramic receivers