Method and apparatus for closed loop frequency control in a two-

Details Method and apparatus for closed loop frequency control in a two- Method and apparatus for closed loop frequency control in a two-

1993-05-25

1995-09-12

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 70, 455127, 455 88, 455 542, 455 671, H04B 138

Patent

active

054506174

ABSTRACT:
A method and apparatus for closed loop frequency control in a two-way radio communication system (100) include a base communication unit (104) and a portable communication unit (108) having a portable-to-base initiation channel (202) assigned to a predetermined frequency. A signal is transmitted (502) from the portable communication unit (108) to the base communication unit (104) on an initiation frequency of approximately the predetermined frequency. The base communication unit (104) determines (506) from the signal a frequency correction factor (326) for recalibrating the initiation frequency in accordance with the predetermined frequency. The frequency correction factor (326) is communicated (512) to the portable communication unit (108), and the portable communication unit (108) recalibrates (516) the initiation frequency in response.

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