Combined trunked/cellular communication unit

Details Combined trunked/cellular communication unit Combined trunked/cellular communication unit

1991-03-28

1992-12-29

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 331, 455 84, 455 89, 379 59, H04B 140

Patent

active

051758725

ABSTRACT:
A communication unit (10), capable of operating in either cellular or trunked communication modes, comprises a receiver (14), a transmitter (16), and a dual synthesizer (18), coupled to the receiver and to the transmitter. The dual synthesizer comprises a main synthesizer (124) and an offset synthesizer (132). The offset synthesizer comprises a phase modulator (131) and an offset voltage-controlled oscillator (134). A protocol controller (20) comprises modulator circuitry for modulating only the offset voltage-controlled oscillator when communication unit operates in the cellular mode, and for modulating both the phase modulator and the offset voltage-controlled oscillator when the communication unit operates in the trunked mode.

REFERENCES:
patent: 4627099 (1986-12-01), Shimahata
patent: 4802235 (1989-01-01), Treatch
patent: 4876741 (1989-10-01), Jacobs et al.
patent: 5020092 (1991-05-01), Phillips et al.
System Saber Securenet Service Manual, Motorola, Inc. (1990).

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