Matches 1 - 31 out of 31
Match Document Document Title
5887259 Multiple mode personal wireless communications system  
A multiple mode, personal, wireless communications system exists within a radiotelephone network serving general customers and provides additional services to a select group of customers. The...
5864762 Operating a trunked communication system in transmission and message trunked modes  
A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600...
5574788 Trunked radio repeater system  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
5544159 Duplex interconnect/dispatch trunked radio  
A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capablity. A...
5408680 Single channel autonomous digitally trunked RF communications system  
A single channel autonomous trunking ("SCAT") RF repeater transmits and receives on a single duplex RF channel. The repeater operates alternately in a control channel mode and in an assigned...
5408466 Duplex interconnect dispatch trunked radio  
A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capability. A...
5369783 Dynamic regrouping in a trunked radio communications systems  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5274838 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
5265093 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5206863 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5175866 Fail-soft architecture for public trunking system  
A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During...
5128930 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5125102 Trunked radio repeater system including synchronization of a control channel and working channels  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
5117501 Dynamic regrouping in a trunked radio communications system  
In a trunked radio frequency communications system, a dynamic regrouping scheme includes an effective user interface, automatic support of multi-site systems, the capability to program individual...
5109543 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
5086506 Radio trunking fault detection system with power output monitoring and on-air monitoring  
A trunked radio frequency (RF) repeater system for public service trunking (PST) or the like includes a fault detection system having an RF output power monitoring, over-the-air RF monitoring and...
5077828 RF channel expansion in a trunked radio communications system  
In a trunked radio frequency communications system, an arrangement dynamically "expands" or extends the frequency allocation table stored within the "personality" defining non-volatile storage...
4939746 Trunked radio repeater system  
A digital trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a...
4926496 Method and apparatus for infrequent radio users to simply obtain emergency assistance  
A digital mobile radio transceiver allows even the most unsophisticated user to simply and easily obtain emergency communications. The transceiver is programmed with "personality" data specifying...
4905302 Trunked radio repeater system  
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses...
4905234 Apparatus and method for transmitting digital data over a radio communications channel  
A digital radio RF signalling protocol communicates either digitized voice or digital data signals and indicates the type of information being communicated to the receiver. Multiple repeats of...
4903262 Hardware interface and protocol for a mobile radio transceiver  
A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message...
4835731 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
4821292 Adaptive limiter/detector which changes time constant upon detection of dotting pattern  
A limiter/detector which takes advantage of the characteristics of the dotting pattern preceding each message in the General Electric Public Service Trunking System shortens bit synchronization...
4747123 MF signal transmitting control apparatus/method for use in cordless telephone system  
A multi-frequency (MF) signal transmitting control apparatus and method for use in a cordless telephone system, according to which a dial signal discrimination code within a transmitted dial signal...
4453265 Speaker driving circuit  
A speaker driving circuit for use with an audio amplifier made selectively ineffective comprising switching means for providing intermittent current to the speaker when said means is energized.
D256239 Wireless telephone  
4179588 Encoder unit for mobile radio transmitter  
A multi-frequency encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent...
4110561 Communication unit for code generation and voice communication  
Communication units for hand-held use, combining a microphone for voice communication with means for generating at least two code frequencies for signaling, are made more compact and economical by...
4101871 Touch-tone encoder unit for mobile radio transmitter  
A touch-tone encoder unit is provided for a mobile radio transmitter which is constructed as a single unitary package comprising a keyboard, a first printed circuit board positioned adjacent to the...
4087638 DTMF Communication system  
A highly flexible and economical dual tone multiple frequency (DTMF) communication system includes a data input source such as a keyboard; a repertory dialer or electronic memory; an integratable...
Matches 1 - 31 out of 31