Matches 1 - 33 out of 33
Match Document Document Title
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...
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...
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...
4486624 Microprocessor controlled radiotelephone transceiver  
An improved radiotelephone includes a unique microprocessor and peripheral devices for controlling the operation of portable or mobile radio transceivers in a cellular-type radiotelephone system....
4434461 Microprocessor with duplicate registers for processing interrupts  
A unique microprocessor for controlling portable and mobile cellular radiotelephones is architectured to process high speed supervisory signalling, while also minimizing power drain. The...
4398265 Keyboard and display interface adapter architecture  
A unique interface adapter is coupled to a microprocessor by a three-wire self-clocking serial data bus for accommodating a twenty-key keyboard and an eight-digit display. The interface adapter...
4390963 Interface adapter architecture  
A unique interface adapter is described which includes circuitry for recovering a clock signal and a non-return-to-zero (NRZ) data signal from a data signal transmitted on two forward data signals....
4301539 Supervising system for use in radio transmission  
A phase shift monitoring system is provided for a mobile communication system which includes a central, or base station, one or more sub-base stations, and a plurality of mobile units. Each...
4281413 Multichannel radio telephone system  
Phantom signals resulting from intermodulation between a busy channel and an idle channel with idle tone cause scanning radio stations to lock on a phantom idle channel and miss communications....
EP0011063A1 Portable radiotelephone system.  
A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated,...
4144496 Mobile communication system and method employing frequency reuse within a geographical service area  
A communication method and system for providing two-way radio communication links between fixed stations and mobile units, particularly suitable for use in mobile telephone communications. A...
3946315 Single frequency signalling in a radiotelephone communication system with idle condition signal generator at one terminal activated by another terminal  
Single frequency signaling system which simulates the low level tone during the idle circuit condition even though the radio frequency carriers in the transmission link through a repeater have been...
3936616 "Wild" mobile disable circuit  
A circuit for disabling, or shutting down, the transmitter of a mobile telephone unit when the unit is not connected to another party is disclosed. When such a "wild" mobile is sensed, a sequence...
3840811 DUPLEXER TYPE RADIO-TELEPHONE DATA RECEIVER AND TRANSMISSION SYSTEM  
A radio-telephone system embodying a duplexer network whereby a request for computerized data may be transmitted to a base station and the data received from the base station through a single...
3755628 TIME DIVERSITY, MULTI-REDUNDANT DATA SYNCHRONIZED TRANSMISSION SYSTEM  
Four independent data stations, each having data sources and data responders, transmit data signals from one to another in response to commands, in the nature of polling instructions or addresses,...
Matches 1 - 33 out of 33