Crystalless scanning radio receiver

Details Crystalless scanning radio receiver Crystalless scanning radio receiver

H - Electricity

03

J

325/117

H03J 7/22 (2006.01)

Patent

CA 1064115

ABSTRACT OF THE DISCLOSURE 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. In one embodiment, decimal frequency information is entered on a numerical keyboard and converted into binary form for programming the memory. Indictor lamps on the receiver illuminate when a channel is being scanned and also provide a visual accuracy check when an operator programs the random access memory.

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