Tuning circuit for high frequency receivers

Details Tuning circuit for high frequency receivers Tuning circuit for high frequency receivers

1976-07-26

1978-08-29

Griffin, Robert L.

325459, 325468, H04B 116

Patent

active

041106954

ABSTRACT:
A tuning circuit for a high frequency receiver in which the received frequency is determined by a voltage-controlled oscillator, the present tuning frequency is indicated by a counter connected to the oscillator and producing a representation of each digit of the decimal number identifying the current received frequency, representations of the digits of the number identifying the desired received frequency are fed in via a keyboard, and the decimal number representations are compared in a comparator to produce a control voltage that brings the oscillator frequency to the desired value, and in which the comparator is capable of comparing only one digit of the number representations at a time and is associated with multiplex circuitry which supplies the digits of corresponding significance thereto in sequence, starting with the most significant digit.

REFERENCES:
patent: 3980951 (1976-09-01), Breeze et al.
patent: 4004232 (1977-01-01), Amaya
patent: 4009439 (1977-02-01), Rast

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