Zone switching system for a frequency synthesized transceiver

Details Zone switching system for a frequency synthesized transceiver Zone switching system for a frequency synthesized transceiver

H - Electricity

04

B

325/26, 365/6

H04B 1/40 (2006.01) H03C 3/09 (2006.01) H03C 3/22 (2006.01) H03D 13/00 (2006.01) H03J 5/02 (2006.01) H03K 23/66 (2006.01) H03L 7/08 (2006.01) H03L 7/193 (2006.01) H03L 7/199 (2006.01)

Patent

CA 1175909

Abstract 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 communi- cation channel. A zone selector switch enables grouping and easy retrievability of channels. 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.

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