Multiband scanning radio receiver using frequency synthesizer

Details Multiband scanning radio receiver using frequency synthesizer Multiband scanning radio receiver using frequency synthesizer

1978-08-04

1979-12-18

Safourek, Benedict V.

Oscillators

Relaxation oscillators

325453, 325459, 325460, 331 1A, H04B 126

Patent

active

041796624

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: 3119067 (1964-01-01), Wohlenberg
patent: 3824475 (1974-07-01), Pflasterer
patent: 3873924 (1975-03-01), Fathauer
patent: 3931578 (1976-01-01), Gittinger
patent: 3961261 (1976-06-01), Pflasterer
patent: 3987400 (1976-10-01), Fathauer
patent: 4027251 (1977-03-01), Fathauer

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