The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 2007
Filed:
Aug. 30, 2005
Tanhoa Trandai, Arlington Heights, IL (US);
Marc W. Cassidy, Fox River Grove, IL (US);
John M. Gilbert, Lake Zurich, IL (US);
Donald R. Griffis, Sunrise, FL (US);
Daniel J. Mcdonald, Cary, FL (US);
David R. Mills, West Palm Beach, FL (US);
Tanhoa Trandai, Arlington Heights, IL (US);
Marc W. Cassidy, Fox River Grove, IL (US);
John M. Gilbert, Lake Zurich, IL (US);
Donald R. Griffis, Sunrise, FL (US);
Daniel J. McDonald, Cary, FL (US);
David R. Mills, West Palm Beach, FL (US);
Motorola, Inc., Schaumburg, IL (US);
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.