Matches 101 - 150 out of 179 < 1 2 3 4 >
Match Document Document Title
5533027 Digital fixed radio access system providing local mobility  
An arrangement for radio communication includes a first radio station or base station, a number of second radio stations, and a number of subscriber stations. The second radio stations each include...
5530914 Method for determining when a radio leaves a radio talk group  
A method for determining when a radio leaves a radio talk group includes the step of notifying a radio(s), such as the initiator of the call (step 308), that one or more members of the talk group...
5530909 Method for Radio transmitting information using aircrafts as open transmission relays  
In order to transmit information between an emitting station and a receiving station separated by a distance exceeding the range of direct communications of said stations, the method according to...
5473605 Method for a communication unit to participate in multiple calls  
While participating in a group call on a first wireless communication resource 114, senior members 104-107 of a communication group 108 can initiate a semi-private call. A central controller 110...
5465386 Signaling protocol for a distributive wide area transmission trunked communication system  
A land mobile transmission trunked communication system is provided with an enhanced control signal protocol. The land mobile transmission trunked communication system includes a plurality of...
5442681 Method of exchanging communicated signals between a remote base site and a central site in a communication system  
A communication system employs a method for exchanging communicated signals between a remote base site (e.g., 63) and a central site (205) on a communication resource (e.g., 77) assigned to the...
5442803 Half duplex communication system having quick channel assignments  
A half duplex radio communication system having including a plurality of terminal equipments and a base station for relaying communications between the terminal equipments is characterized by, in...
5440759 Modular networking switch system for a distributive wide area transmission trunked communication system  
A modular networking switch system for a land mobile transmission trunked communication system provides transmission trunked communications with a plurality of transceivers and networks the...
5423055 Trunked communication system with automatic repeater talk-around  
A method to implement multiple talk-around communication links using the communication resources of one repeater. A system resource controller determines whether talk-around is possible for any two...
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...
5369781 Dispatch communication system with adjacent system signal repeating  
A dispatch communication system wherein a communication unit may move from the service coverage area of a first system to the service coverage area of a second system during a communication...
5355511 Position monitoring for communicable and uncommunicable mobile stations  
An information communicating system and method comprising an order station and a plurality of mobile stations. When the order station cannot communicate with a mobile station, the order station...
5327580 Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode  
A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being...
5321736 Distributed RF repeater arrangement for cordless telephones  
An RF repeater arrangement for use in linking cordless handsets to a base station, has RF repeaters spaced from a common power supply unit and so distributed over an area to be serviced by the...
5313652 Method and apparatus for providing a communication path using common sites  
A method of collapsing a communication path among at least two communication units (104-107) reduces the number of sites normally required to provide a communication. Each of a plurality of site...
5291518 Link system for radio paging service  
Linking of radio paging transmitters is accomplished through the utilization of TDM transmission on the same channel as that assigned to the paging service, thus eliminating the necessity of a...
5287542 Method to expand an audience in a communication system network  
A central controller of a communication system network may more efficiently expand an audience of a communication in the following manner. When a communication unit of a first communication group...
5278990 Two way radio communication system  
A radio communication system includes a central station such as a repeater for transmitting FM signals to a plurality of radios. The repeater 11 is capable of receiving both analog speech FM...
5239666 Mobile detector using RSSI for vehicular repeater prioritization  
A communication system (10) comprises a portable radio (20) and a plurality of mobile repeaters (12), a mobile repeater system 200 comprising a portable signal receiver (224) for receiving portable...
5230080 Ultra-high frequency communication installation  
A communication installation for use in a site having underground galleries, for information exchanges, comprises a repeater connected to a wired distribution network. The repeater is arranged for...
5218715 Multi-donor booster operation and system  
A system and method for handing back a movable transceiver to a different cell site from the original cell site includes circuitry for sensing signals from the movable transceiver which are...
5187806 Apparatus and method for expanding cellular system capacity  
In a cellular system, including at least one cell site located within a corresponding geographic sector, an apparatus and method provides for expanding cellular system capacity through subdivision...
5168574 System and method for switching between antennas in a radio frequency booster  
A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected...
5168575 Demand driven wide-area radio system resource assignment method and apparatus  
A method of re-using communication resources within a trunked mobile communication system by incrementally allocating common communication resources in adjacent service coverage areas to service...
5159695 Communication system to communication system communication system  
Independent communication systems are provided with additional receivers that allow the systems to monitor one another's outbound control signalling channels. Secondary control signalling can be...
5133080 Repeater for a controlled radio system  
A repeater (30) is provided for relaying communication between a subscriber unit (24) and a central station (10) when the repeater recognizes transmission from the subscriber unit to the central...
5119500 Meteor burst communication system  
A meteor burst communication network is disclosed that consists of a plurality of meteor burst communication stations that relay radio messages off of meteor burst trails from one station to...
5109526 Vehicular repeater system  
A vehicular repeater interrupts the repeated audio and a timing signal that is transmitted to the portable. The timing signal is used by the portable to determine when the vehicular repeater will...
5095528 Repeater with feedback oscillation control  
An apparatus for detecting excessive output power from a cellular radio telephone system booster includes input circuitry for receiving incoming radio frequency signals from a mobile source....
5081703 Satellite mobile communication system for rural service areas  
A mobile communications system uses a communications satellite and a Mobile Telephone Switching Office (MTSO) and communicates with mobile units via the satellite. A cell site has a co-located cell...
5065449 Booster diversity receiving system usable with cellular booster  
A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected...
5058199 Inter-truncked radio systems bridge protocol  
A radio signal relay system for use with dispatch communication systems is disclosed. The radio signal relay system includes a linking device constructed with a first and a second full duplex...
5020130 Universal frequency assignment protocol for trunked radio systems  
A trunked communication system wherein channel assignment information is provided to a requesting subscriber unit in a dual word format that includes separate and specific information regarding...
5010583 Repeater for a wide area coverage system  
A repeater for a wide area coverage multiple repeater system (100) includes a receiver (220) and a transceiver (230). The receiver (220) receives a received signal from a portable or mobile...
4972505 Tunnel distributed cable antenna system with signal top coupling approximately same radiated energy  
A distributed radio antenna system for extending radio communications into confined regions into which external radio signals do not penetrate, the system having separate transmitting (TX) and...
4868886 Combined global/spot beam configuration for satellite communications  
In antenna arrays having normally unexcited or little-excited elements, a technique for configuring the array to provide both global and spot beam coverage, wherein the normally unexcited or...
4849963 Cellular radio telephone enhancement circuit  
For use in a cellular radio-telephone system to enhance a signal from a cell site in an area shadowed by an obstruction such as a building or a mountain or the like, and to receive signals from...
4837858 Subscriber unit for a trunked voice/data communication system  
A trunked voice/data subscriber is provided that operates in either a voice mode, or one of three data modes. In a first data mode, the voice/data subscriber monitors the voice control channel to...
4777652 Radio communication systems for underground mines  
A radio communications system operational within the medium frequency range for underground mine communications, coupling MF carrier signals into existing conductive channels extending to within...
4764979 Direct relay equipment  
Direct relay equipment includes a first antenna, a second antenna, an up direction circuit connected from the first antenna via a first circulator to the second antenna via a second circulator, and...
4578815 Wide area coverage radio communication system and method  
A wide area coverage radio communication system of the type adapted to relay a message substantially simultaneously from a plurality of fixed location sites to a plurality of portable or mobile...
4577327 Data transmission including a repeater  
A repeater for a transmission system which can pass signals in either of two directions. Each direction has a signal detection circuit associated with it. Upon detection of the beginning of a...
4553262 Communications system enabling radio link access for non-trunked radio units to a multifrequency trunked two-way communications systems  
An improved multifrequency trunked, two-way communications system is provided in which a plurality of conventional single channel radio units are provided access. The system includes a...
4539706 Mobile vehicular repeater system which provides up-link acknowledgement signal to portable transceiver at end of transceiver transmission  
A mobile vehicular repeater detects the termination of a received transmission from a portable transceiver to be repeated and, in response to such detection, activates the up-link radio transmitter...
4506383 Method and apparatus for relaying signals between a ground station and a satellite using a ground relay station  
In satellite communication systems it is often necessary to relay the signal between terminal stations and the satellite through ground relay stations remote from the terminal stations. Normally,...
4495648 Transmitter power control circuit  
In a radio communication system, an adaptive transmitter power control system is described wherein the signal level at each receiver is monitored and a control signal, which is a function of the...
4427968 Distribution network communication system with flexible message routes  
Each customer location is equipped with a remote terminal which contains a role code identifying the remote terminal as an end device and a plurality of address codes. A plurality of signal...
4422179 Electrical-optical interface network  
An electrical-optical interface network for use in a carrier-sense, multiple-access system with collision-detection provides two-way transmission between an electrical circuit (5,7,9) and a pair of...
4387466 Half-duplex digital transmission system  
The system comprises two terminal stations connected through a two-wire transmission line including bidirectional repeaters. The duration of each half-duplex cycle between successive emissions of...
4334303 Monitoring system for telecommunication links equipped with repeaters-regenerators  
Monitoring system for a forward and backward link equipped with two way repeaters-regenerators comprises a monitoring station including means for transmitting through the forward link information...
Matches 101 - 150 out of 179 < 1 2 3 4 >