Method for automatically searching for an RF station

Details Method for automatically searching for an RF station Method for automatically searching for an RF station

1980-12-22

1983-01-04

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455165, 455182, 455183, 455260, H03J 728, H03L 718, H04B 126

Patent

active

043675581

ABSTRACT:
A method of automatically searching for an RF carrier uses a synthesized frequency. The synthesized frequency is generated by a voltage controlled oscillator which is part of a phase locked loop. The phase locked loop has a programmable divider which is controlled by a phase locked loop controller. The phase locked loop controller receives inputs from a frequency discriminator which is a portion of an RF receiver which is receiving the RF signals. The search is accomplished by using a frequency sweep rather than searching for a carrier at allocated frequency positions. When the search is initiated, large frequency steps are taken until a carrier signal is passed up and then the steps are decreased in size and inversed until the carrier signal is encountered again.

REFERENCES:
patent: 3936753 (1976-02-01), Clark
patent: 4280140 (1981-07-01), Skerlos

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