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 frequency bands. The receiver incorporates a phase-locked-loop frequency synthesizing means for generating beating signals for use in tuning specific channels and also incorporates processing means for controlling the frequency synthesizing means and the overall receiver operation. The processing means comprises a central processing unit, keyboard and display interface circuitry, general purpose input and output device and memory means. The receiver includes a keyboard and a display for viewing information during the operation of the receiver.

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.