Masco Corporation of Indiana

Wayne L Holst

George H Fathauer

A mobile citizens band radio transceiver having the circuitry partitioned so as to permit the chassis housing the receiver circuitry, transmitter circuitry and frequency synthesizer circuitry to be installed in a remote location in a motor vehicle such as behind the dashboard, under the seat or in the trunk thereof, or the like, so as to reduce the possibility of theft and/or the likelihood that the chassis could cause injury to the occupants of the vehicle in the event of an accident or sudden stop by efficiently housing all of the control circuitry in a combination microphone and control unit adapted to be held in the hand of the operator of the vehicle and operated by the same hand which is holding the combination unit. By having all of the controls located in the microphone, a jack plug arrangement or the like can be utilized so that the microphone can be easily removed when the operator is not in the vehicle so that no sign of the presence of the CB radio will be visible to a potential thief. The partitioning of the circuitry between the controls in the microphone and the frequency synthesizer located on the remote chassis is enabled by the use of a memory in the control circuit for storing data words corresponding to the various CB radio frequency channels to be selected, manually-operable channel selection circuitry for addressing a given word in the memory and circuitry for serially transmitting the data word indicative of the selected channel to the remotely located frequency synthesizer thereby significantly reducing the size and number of electrical connections therebetween. The remotely located frequency synthesizer serially receives the stored control word and uses one or more portions thereof to preset counters in the frequency synthesizer circuitry so as to operate a phase-locked loop at precisely the given channel selected by the operator.

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Mesa, AR, United States of America

Wayne L Holst