Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1985-04-26
1989-01-31
Griffin, Robert L.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 77, 331 18, H04B 140, H03L 700
Patent
active
048022357
ABSTRACT:
A communication transceiver is described which can permit operation of the transceiver unit in either the trunked dispatch mode or in the cellular mode. The ability to utilize two sets of frequencies with different transmitter channel separation can be accomplished by providing a phase lock loop configuration with a signal having a frequency that is the separation between the transmit channels of the selected communication system or is a fraction thereof. Similarly, a controllable reference oscillator frequency is forced through the phase locked loop configuration, to provide a signal for which a the frequency multiple of the difference frequency for the selected communication mode and is the frequency of the channel. A scaling network provides a signal for the phase lock loop that, for the correct frequency of a controllable oscillator, is the difference between the transmitter or receiver channels. The feedback loop is used to control the controllable oscillator frequency so that the reference frequency establishes the channel difference frequencies for the voltage controlled oscillator. Apparatus is described for retrofitting existing devices to use the two frequencies or for providing a general frequency synthesizing network to accommodate both modes of communication in response to appropriate logic signals.
REFERENCES:
patent: 2380288 (1945-07-01), Bligh et al.
patent: 3155907 (1964-11-01), Wulfsberg et al.
patent: 3710274 (1973-01-01), Basse et al.
patent: 4061973 (1977-12-01), Reimers et al.
patent: 4354164 (1982-10-01), Gupta
patent: 4399555 (1983-08-01), MacDonald et al.
Giles T. G., "Versatile LSI Frequency Synthesizer System, " p. 93, Saunders, "A New Twist to Source Looking," 9/77, FIG. 2.
Comven, Inc.
Griffin Robert L.
Kuntz Curtis
Weiss Harry M.
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