Crystalless scanning radio receiver

Details Crystalless scanning radio receiver Crystalless scanning radio receiver

1974-03-14

1976-06-01

Libman, George H.

325453, 325459, 325460, 325470, H04B 106

Patent

active

039612619

ABSTRACT:
A scanning FM monitor receiver is disclosed which is of the superheterodyne type and is capable of scanning and receiving a plurality of channels on a plurality of bands. The receiver incorporates a phase-locked-loop frequency synthesizer which eliminates the need for crystals for every channel. The input data that the synthesizer requires to develop the individual preselected frequencies is provided by a random access memory that is programmed by the user for the frequencies desired. Indicator lamps on the receiver illuminate when a channel is being scanned and also provides a visual accuracy check when an operator programs the random access memory with the data codes for producing the various frequencies.

REFERENCES:
patent: 3641438 (1972-02-01), Canty
patent: 3665318 (1972-05-01), Hoffman
patent: 3714585 (1973-01-01), Koch
patent: 3803494 (1974-04-01), Howell et al.
patent: 3845394 (1974-10-01), Hamada
patent: 3882400 (1975-05-01), Hamada

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