Multiband scanning radio receiver

Details Multiband scanning radio receiver Multiband scanning radio receiver

1974-11-04

1976-10-19

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325459, 334 15, H04B 132

Patent

active

039874001

ABSTRACT:
There is disclosed a signal-seeking, scanning superheterodyne radio receiver operable on all four bands comprising the public service radio frequencies. The receiver uses a single oscillator and appropriately controlled frequency multipliers to generate the required local oscillator signals. Circuitry is included for tracking the radio frequency portions of the receiver to tune them for optimum operation as the receiver is tuned to different portions of the individual bands. The tracking circuitry is responsive to the oscillator circuit and includes two parallel resonant circuits connected in series to generate a d.c. signal varying in amplitude in response to the oscillator frequency. Circuitry is also included for altering the magnitude of the d.c. signal in accord with the band to which the receiver is tuned.

REFERENCES:
patent: 2902598 (1959-09-01), Hills
patent: 3249876 (1966-05-01), Harrison
patent: 3473128 (1969-10-01), Kiser
patent: 3496473 (1970-02-01), Seppeler et al.
patent: 3665318 (1972-05-01), Hoffman et al.
patent: 3824475 (1974-07-01), Pflasterer
patent: 3845393 (1974-10-01), Basset
patent: 3873924 (1975-03-01), Fathauer

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