Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Pulse multiplication or division
Patent
1981-04-06
1984-10-16
Orsino, Jr., Joseph A.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Pulse multiplication or division
377 26, 377 44, H03K 2136
Patent
active
044779194
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. 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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Motorola MX300 Series, "Handie-Talkie", FM Two-Way Portable Radios, Theory/Maintenance Manual.
New Synthesizer Circuits from Plessy Semiconductors, SP-8792, 80/81, SP-8793, 40/41.
Borras Jaime A.
Gonzalez Ruben J.
Downey Joseph T.
Gillman James W.
Greer Timothy K.
Motorola Inc.
Orsino Jr. Joseph A.
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