Tunable selective super heterodyne receiver

Details Tunable selective super heterodyne receiver Tunable selective super heterodyne receiver

1977-02-25

1978-09-05

Griffin, Robert L.

325460, 325489, 325469, H04B 132

Patent

active

041123751

ABSTRACT:
A tunable selective heterodyne receiver which receives an input signal and is capable of supplying such input signal through one or two receiving channels and wherein in the first channel a first mixer receives a tunable input from an injection oscillator and supplies it to a second mixer which receives an input from a fixed frequency oscillator and the output of the second mixer comprises a fixed IF and wherein the second receiving channel comprises a third mixer which receives the input signal and also receives an output from a frequency divider which receives the output of the tunable injection oscillator and which has a dividing factor which is determined by the center frequency of a first band pass filter at the output of the first mixer divided by the center frequency of the fixed IF, thus, allowing a receiver tunable over a very broad frequency range.

REFERENCES:
patent: 2902596 (1959-09-01), Rockwell et al.
patent: 2954465 (1960-09-01), White
patent: 3696302 (1972-10-01), Gossard
patent: 3704423 (1972-11-01), Kadron et al.
patent: 3931578 (1976-01-01), Gittinger
patent: 4000470 (1976-12-01), Okada

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