Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1981-04-06
1983-07-19
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 77, 455166, H04B 138, H03J 700
Patent
active
043947760
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 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.
REFERENCES:
patent: 3617895 (1971-11-01), Tomsa
patent: 3619788 (1971-11-01), Giles, Jr. et al.
patent: 3832636 (1974-08-01), Kubo
patent: 4156193 (1979-05-01), Baker
patent: 4287599 (1981-09-01), Goncharoff et al.
Borras Jaime A.
Gonzalez Ruben J.
Smith Daniel M.
Wieczorek Alfred B.
Downey Joseph T.
Gillman James W.
Motorola Inc.
Ng Jin F.
Roney Edward M.
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