Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-06-05
2007-06-05
Ferguson, Keith (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S426200, C455S422100, C455S403000, C455S410000, C455S411000, C455S500000, C455S517000, C370S340000, C370S341000
Reexamination Certificate
active
11214504
ABSTRACT:
A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting a voice channel number from 319, multiplying by a channel spacing and adding a base frequency to yield the transmit frequency, if the voice channel number is between 319 and 0. The receiving device determines a receive frequency by 851.0125 MHz+[(319−a voice channel number)*25,000 Hz], if the voice channel number is between 319 and 0. In any case, the voice channel number is communicated in an outbound signaling message defined by Motorola's 3600-baud radio trunking protocol.
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Cassidy Marc W.
Gilbert John M.
Griffis Donald R.
McDonald Daniel J.
Mills David R.
Davis Valerie M.
Ferguson Keith
Motorola Inc.
Saladi Indira
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