H - Electricity – 03 – L
Patent
H - Electricity
03
L
365/5
H03L 7/16 (2006.01) H03J 7/28 (2006.01)
Patent
CA 1049165
ABSTRACT OF THE DISCLOSURE 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 pre- selected frequency. The output signal of the local oscillator is combined with the output signal of a reference signal generator. After the combin- ation of the local oscillator signal with the reference oscillator signal produces a preestablished condition which is the result of the local oscil- lator signal attaining the preselected frequency the frequency of the local oscillator signal is held constant. The local oscillator signal is there- after 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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