Matches 451 - 500 out of 524 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5351270 Portable cellular telephone using spread spectrum communication with mobile transceiver  
A portable cellular telephone system including a stationary transceiver for radio communication with a plurality of mobile transceivers within a geographic cell, a mobile transceiver within said...
5349694 Radio relay system with a multiplex separation circuit and control for providing time delay multiplex operation of receiver and transmitter  
A radio relay system which comprising an external conductor, a first antenna installed on the externals conductor for transmitting and receiving a first radio carrier wave, a second antenna...
5349584 Method of maintaining control in a trunked communication system  
A master repeater controls a trunked communication system having a number of communication resources. The master repeater determines (201) how many communication resources are available to the...
5345244 Cordless SPS smart antenna device  
Cordless antenna apparatus for determination of the location of an observer and/or of the time of observation by use of a Satellite Positioning System (SPS), such as the Global Positioning System...
5335262 Radio communication adapter connected to mobile station and mobile communication system using the radio communication adapter  
A radio communication adapter is used in a mobile communication system including a first mobile communication network, first mobile stations registered in the first mobile communication network, a...
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...
5265150 Automatically configuring wireless PBX system  
A wireless PBX system provides ease of installation without site engineering or trial-and-error placement of components within the system. In its basic form, the wireless PBX system consists of...
5233626 Repeater diversity spread spectrum communication system  
A repeater diversity spread spectrum communication system provides substantially fade free communications between a transmitter (1) and a receiver (7). A transmitted signal is relayed through a...
5214774 Segmented memory transfer and message priority on synchronous/asynchronous data bus  
Apparatus and method for transferring segmented memory between memory units determines a need for memory transfer and searches a memory unit segment by segment until a valid data record is found....
5163158 Modular communications system including a portable unit range extender and selective-call system  
A method and apparatus for extending the range of portable RF transceivers and for providing a select-call system includes a hybrid remote control system to extend the range of a portable...
5152002 System and method for extending cell site coverage  
A system and a method for extending coverage of a cell site in a cellular radio telephone system include a plurality of repeaters or boosters which are spaced through the region where increased...
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...
5127042 Cellular cordless telephone  
A cellular cordless telephone (10) operates with both a cordless base station (180) and a cellular base station (190) and cellular control terminal (196). In one embodiment (FIG. 2) , a cellular...
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...
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...
5056152 Dual level prioritized vehicular repeater system  
A second level of vehicular repeater units is added to a conventional repeater system. The secondary vehicular repeaters may be specialized units, such as, motorcycle units that may be rendered...
5054051 Autodial from database in an electronic wristwatch  
A system and method to autodial a telephone number, employing (1) an electronic wristwatch which includes means for receiving radio paging messages and a memory for storing a database of...
5025254 Communication system with improved resource assignment  
A trunked communication system wherein some of the communication resources are preassigned for exclusive use only by a predetermined group, such as a public safety agency. In addition, to assure...
5023930 Booster with detectable boost operation  
An apparatus and method for selecting a number of cellular radio channels to be boosted in a given geographical area provides either F1-F1 or F1-F2 operation. The signals can be boosted at the same...
4920570 Modular assistive listening system  
A modular assistive listening system is disclosed that employs a hand-held switching/control module to select one or more of the signals transmitted from a plurality of remote input modules. The...
4906989 Paging system having a vehicle mounted repeater with a portable paging receiver detachably mounted thereon  
A paging system allows an on-board radio unit of a vehicle telephone for business use to serve as a repeater as needed. An on-board repeater is mounted on the same vehicle as the on-board radio...
4885796 Communication apparatus for use in hazardous environments  
Included in the communication apparatus are a face mask covering the eyes, the nose, and mouth of the user and which has a frame holding a transparent viewing shield with a peripheral resilient...
4882765 Data transmission system  
Data is transmitted from a mobile or a base station to a booster or repeater station which, if it identifies that the same message has been retransmitted a preset number of times by the mobile or...
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...
4817190 Method for dynamically regrouping subscribers on a communications system  
An improved communication system is disclosed wherein at least one reprogramming station is added to a communication system. The reprogramming station is constructed and arranged to communicate...
4803487 Portable communications receiver with separate information presentation means  
A personal message receiving apparatus is described including a portable communications receiver, intended to be carried by the user, which receives, detects and stores messages transmitted on a...
4783799 Electronic communications and control system  
A fully distributed, disposable, self-organizing, independently powered communications system is described capable of providing a radio-communications channel in environments that may prove...
4747158 Cordless communications system  
A cordless communications system wherein transmission is made and received via magnetic lines of induction comprises a base station and at least one mobile station wherein the base station receives...
4745632 Wireless mobile telephone communication system  
A wireless mobile telephone communication system for communicating with a base station is disclosed. The communication system is designed to integrate a conventional wireless telephone unit with a...
4706086 System for communication and automatic signalling between a plurality of motor vehicles  
Each of a plurality of motor vehicles is equipped with a transmitter (1) and a receiver (2) for transmitting and receiving electromagnetic or pressure waves, detector devices (30-40) arranged to...
4659878 Method and apparatus for interference free communications between a remote handset and a host subscriber unit in a Cellular Radio Telephone System  
A method and apparatus for providing interference free rf communications between remote handsets and host subscriber units in a Cellular Radio Telephone System includes the use of data transmission...
4627107 Radio communications system including vehicle mounted and hand-held radio devices  
A radio system providing two-way radio communications between a mobile radio transmitting and receiving station operating in a first frequency range and a stationary radio transmitting and...
4607389 Communication system for transmitting an electrical signal  
The present invention is a communication system for transmitting an electrical signal from a transmission tower and includes a first transceiver located adjacent the base of the tower and which is...
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...
4539557 Combined communication, security and alarm radio system  
A combined communication, security and alarm radio system for supervising equipment in a plant or installation, in which a base transmitter/receiver (4) is in two way communication with a remote...
4495495 Staff-location and signalling system for use in mines  
A staff-location and signal system for mines, in which conventional radio telephone devices can be used for producing a radio telephone connection between an exchange and base stations or between...
4438429 Emergency signal transceiver for disabled car  
An emergency signal transceiver for a disabled vehicle for generating a repetitive pulse signal, digital apparatus for producing a pulse signal from such a received repetitive pulse signal for...
4347501 Installation for transmitting alarm signals  
In an installation for transmitting alarms, preferably in connection with attacks on persons, and for locating the alarm sender, there is at least one portable alarm sender 2 sending an alarm to a...
4334315 Wireless transmitting and receiving systems including ear microphones  
A wireless transmitting and receiving system includes an ear microphone of the vibration pick-up type for picking up bone-conducted voice signals through an external auditory ear canal wall of a...
4284848 Switched network telephone subscriber distribution system  
A network of telephone subscribers, located remote from the primary telephone system, includes subscriber stations having two frequency-agile, multi-channel duplex transceivers for communicating...
4234959 Dual threshold repeater squelch circuit  
In a mobile repeater system there can be two priority repeaters at two adjacent locations which are out of range of each other, but not out of range of each other's portable units. Reception of a...
4217588 Object monitoring method and apparatus  
An improved method and apparatus for automatically monitoring objects, such as vehicles, for example, wherein signpost units are positioned at predetermined locations and each signpost unit...
4152647 Rapidly deployable emergency communication system  
A highly versatile, highly portable emergency communication system which permits deployment in a very short time to cover both wide areas and distant isolated areas depending upon mission...
4150334 Control circuit for a radio repeater  
Some radio repeaters receive a voice signal on a first frequency and an information tone signal on a second frequency, and transmit both the voice and tone signals on a third frequency. A circuit...
4144497 Two-way communications system having remote channel selection  
A channel priority encoder in a mobile/repeater unit of a two-way communications system allows a low power, detached unit to remotely select a desired channel for high power repeater transmission...
4097809 Local event broadcast system  
A system for providing coverage of a local event such as a sporting event for the spectators thereof includes a plurality of portable radio broadcast receivers to be carried by the spectators. A...
4056780 Vehicle repeater prioritization system  
An improved repeater adds on to each mobile transceiver of a radio wave communication system for selectively controlling rebroadcasts to an associated portable station. Novel circuitry within each...
4056779 Vehicular repeater  
In a two-way communications system involving portable-mobile-base station transmission, a priortization method prevents interference caused by more than one mobile repeater at a single location...
3984807 Vehicle location system  
A vehicle location system having a plurality of stationary wayside stations positioned at predetermined geographical locations. The passage of a vehicle near a station references the location of...
3955140 Mobile radio extension unit with punch through operation  
A mobile radio extension unit for converting a conventional mobile transceiver having a transmitter and a receiver to use as a repeater or transponder for establishing a bidirectional...
Matches 451 - 500 out of 524 < 1 2 3 4 5 6 7 8 9 10 11 >