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Priority-channel-system-for-a-synthesized-transceiver

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OF THE PREFERRED EMBODIMENT The drawing illustrates a communications system generally designated 10...

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Priority channel system for a synthesized transceiver

Details

Inventors: Borras, Jaime A.; Gonzalez, Ruben J.; Smith, Daniel M.; Wieczorek, Alfred B.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Ng; Jin F.
Assistant Examiner:
Attorney, Agent or Firm: Downey; Joseph T., Gillman; James W., Roney; Edward M.

A frequency synthesized transceiver capable of tuning to a plurality of communication channels is disclosed. The transceiver includes a receiver section and a transmitter section which are coupled to the synthesizer which generates the appropriate injection signals to achieve tuning. The frequency synthesizer includes a multiposition switch which accesses various addressable memory locations in a programmable read-only memory where the appropriate divisors are stored to cause tuning of the synthesizer to the appropriate communication channel. A zone selector switch enables grouping and easy retrievability of channels. The synthesizer includes a priority channel monitoring system utilizing a channel element for rapid sampling. The divisors are supplied to a single synchronous binary swallow counter which works in conjunction with a dual modulus prescaler to monitor the frequency output of the voltage controlled oscillator. A programmable divider coupled to a reference oscillator source is compared with the output of the synchronous counter in a digital and analog phase detector. The phase detector supplies signals through a loop filter to apply the appropriate voltage to the voltage controlled oscillator. The phase detector includes means to rapid advance the voltage controlled oscillator to cause frequency tuning.

DETAILED DESCRIPTION It is an object of the present invention to provide priority channel monitoring system for a synthesized transceiver.
It is another object of the present invention to provide a priority channel monitoring system which does not disrupt the reception of normal communications.
A digital frequency synthesized portable receiver capable of tuning a plurality of communications channels includes a priority channel monitoring system which comprises a crystal channel element capable of providing injection signals to the receiver section of the transceiver for tuning to a predesignated priority channel; sampling means coupled to the digital frequency synthesizer and the crystal channel element, alternately supplying injection signals from the synthesizer and the channel element to the receiver portion of the transceiver; carrier detection means detecting the presence of carrier signal in the receiver section of the transceiver; and priority means coupled to the carrier detection means and the sampling means, disrupting the operation of the sampling means and establishing tuning of the transceiver at the communication channel corresponding to the crystal controlled channel element when a carrier signal is detected on that frequency.

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