Telecommunications – Carrier wave repeater or relay system – Two separate way transmission
Reexamination Certificate
2005-08-30
2009-06-09
Nguyen, Duc (Department: 2618)
Telecommunications
Carrier wave repeater or relay system
Two separate way transmission
C455S426100, C455S426200
Reexamination Certificate
active
07546085
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 759, multiplying by a channel spacing and adding a base frequency to yield the transmit frequency. The receiving device determines a receive frequency by a base frequency+[(759−a voice channel number)*25,000 Hz], where the base frequency is at least one of 851.0125 MHz, 851.0250 MHz, and 851.000 MHz. In any case, the voice channel number is communicated in an outbound signaling message defined by Motorola's 3600-baud radio trunking protocol.
REFERENCES:
patent: 4646345 (1987-02-01), Zdunek et al.
patent: 4716407 (1987-12-01), Borras et al.
patent: 4723264 (1988-02-01), Sasuta et al.
patent: 4870408 (1989-09-01), Zdunek et al.
patent: 5225843 (1993-07-01), Thompson
patent: 6188979 (2001-02-01), Ashley
patent: 6252910 (2001-06-01), West et al.
patent: 6308050 (2001-10-01), Eklof
patent: 6922135 (2005-07-01), Abraham
patent: 7228130 (2007-06-01), Trandai et al.
TIA TSB-102.AABC, “Project 25 Trunking Control Channel Messages New Technology Standards Project Digital Radio Technical Standards TR-8.10 Subcomittee”, May 31, 1996.
TIA TSB-102.AABD, “Project 25 Trunking Procedures New Technology Standards Project Digital Radio Technical Standars”, Oct. 1997.
Cassidy Marc W.
Gilbert John M.
Griffis Donald R.
McDonald Daniel J.
Mills David R.
Davis Valerie M.
Motorola Inc.
Nguyen Duc
Saladi Indira
Youssef Adel
LandOfFree
Method for preventing an unauthorized device from operating... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for preventing an unauthorized device from operating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preventing an unauthorized device from operating... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4128301