Matches 1 - 35 out of 35
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...
4856024 Data transceiving modem  
A modem for transmitting and receiving digital information includes an oscillator, a switch connected to both the oscillator and to a data input for switchably controlling the oscillator to impress...
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...
4066964 Communication system  
This invention relates to a communication system wherein a plurality of stations can communicate with each other, without going through a central switchboard; and more particularly to such a...
3825691 F-T RADA RECEIVER WITH LEVEL DISCRIMINATION  
An F-T RADA receiver is provided with level discriminating means, including automatic gain control means. The level discriminating means exerts filtering action on the signal pulses having the...
3691464 ASYNCHRONOUS, SWEPT FREQUENCY COMMUNICATION SYSTEM  
A communication system for transmitting information in digital form from a transmitter to a receiver through a noisy or disturbed channel. Each digit of the digital data to be transmitted is...
3675513 COMMUNICATIONS SYSTEM FOR ALPHANUMERIC INFORMATION EMPLOYING AUDIO TONE SIGNALLING  
A communications system for exchanging alphanumeric information between remote stations, employing station apparatus (e.g., modified typewriters) capable of generating and responding to an audio...
3612770 TRANSMISSION SYSTEM COMPRISING A TRANSMITTER AND A RECEIVER FOR THE TRANSMISSION OF INFORMATION IN A PRESCRIBED FREQUENCY BAND AND TRANSMITTERS AND RECEIVERS TO BE USED IN SAID SYSTEM  
A circuit for separating an auxiliary signal component from a main signal component has a pulse restorer and a difference producer coupled to receive the composite signal. The output of the...
3596181 SELECTIVE SIGNALLING SYSTEM  
The disclosure relates to a central station having an encoder which is operable to selectively call any one of a plurality of individual remote stations by the transmission of a unique code which...
3562431 ASYNCHRONOUS COMMUNICATIONS SYSTEM  
An asynchronous communication system for mobile and fixed radio communications which includes a plurality of subscriber's stations, a plurality of trunk stations and a central station, in which the...
3542956 PCM TELEPHONE COMMUNICATION SYSTEM  
3523250 TIME DIVISION MULTIPLEX MULTIPLE FREQUENCY DIVERSITY TROPOSCATTER COMMUNICATION SYSTEM  
3517312 TELEPHONE AND TELEGRAPH SWITCHING SYSTEM UTILIZING A STATIONARY SATELLITE  
3492581 EMERGENCY CALLING SYSTEM  
3475558 TIME GATED PSEUDONOISE MULTIPLEXING SYSTEM  
3428899 SELECTIVE COMMUNICATION SYSTEM WHEREIN FACH INFORMATION PULSE IS ADDRESS CODED FOR TRANSMISSION ON A SELECTED IDLE CARRIER FREQUENCY  
Matches 1 - 35 out of 35