Electronic automatic frequency tuning system

Details Electronic automatic frequency tuning system Electronic automatic frequency tuning system

H - Electricity

03

L

365/5

H03L 7/16 (2006.01) H03J 5/00 (2006.01) H03J 7/28 (2006.01)

Patent

CA 1041238

ABSTRACT Apparatus and method for providing an automatic frequency tuning system capable of supplying a local oscillator signal with a preselected frequency. The frequency of an output signal of the local oscillator is electronically varied across a frequency region which includes the preselected frequency. The output signal of the local oscillator is combined with the output signal of a reference signal generator. After the combination of the local oscillator signal with the reference oscillator signal produces a preestablished condition which is the result of the local oscillator signal attaining the preselected frequency, the frequency of the local oscillator signal is held constant. The local oscillator signal is thereafter compared to the reference oscillation signal and a change in the local oscillator signal frequency is corrected by means of an automatic frequency control feedback loop containing a discriminator circuit.

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