Double super-heterodyne receiver

Details Double super-heterodyne receiver Double super-heterodyne receiver

1977-10-27

1980-09-30

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455315, H04B 126

Patent

active

042259746

ABSTRACT:
A double superheterodyne receiver comprising a first mixer responsive to a frequency modulated signal and a first local oscillator signal for providing a first intermediate frequency signal having a frequency f.sub.1 and a positive side frequency deviation of +.DELTA.f.sub.1 and a negative side frequency deviation of -.DELTA.f.sub.2 where .DELTA.f.sub.1 =.DELTA.f.sub.2, a second mixer responsive to the first intermediate frequency signal and a second local oscillator signal having a frequency f.sub.s for providing a second intermediate frequency signal having a frequency of f.sub.2 and harmonics nf.sub.2 and (n+1)f.sub.2 where n is positive integer indicating the harmonic of f.sub.2 in the lower side of f.sub.1 which substantially deviates to f.sub.1 +.DELTA.f.sub.1 or to f.sub.1 -.DELTA.f.sub.2 and n+1 indicates the harmonic of f.sub.2 in the upper side of f.sub.1 which substantially deviates to f.sub.1 -.DELTA.f.sub.2 (when nf.sub.2 substantially deviates to f.sub.1 +.DELTA.f.sub.1) or to f.sub.1 +.DELTA.f.sub.1 (when nf.sub.2 substantially deviates to f.sub.1 -.DELTA.f.sub.2).

REFERENCES:
patent: 3433903 (1969-03-01), Murray et al.
patent: 3603885 (1971-09-01), Bartholomew
patent: 3614627 (1971-10-01), Runyan
patent: 3639840 (1972-02-01), Shekel et al.
patent: 3942120 (1976-03-01), Ham
patent: 4027242 (1977-05-01), Yamanaka
"The Radio Experimenter's Magazine", 11/1976, pp. 327-332, by Kumagai.

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