Multiposition switch with minimum interconnections

Details Multiposition switch with minimum interconnections Multiposition switch with minimum interconnections

1981-04-06

1984-04-03

Swann, III, Glen R.

Communications: electrical

Audible indication

Percussion-type sound producer

340696, 34082577, G08C 908

Patent

active

044410980

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 communication channel. The multiposition switch has a minimum number of interconnection lines connected to an analysis circuit which identifies the switch position. 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.

REFERENCES:
patent: 2923919 (1960-02-01), Langdon
patent: 3932714 (1976-01-01), Guimier et al.

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