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| Number | Title | Issue Date |
| 4517669 | Method and apparatus for coding messages communicated between a primary station and remote stations of a data communications system A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field,... | 05/14/1985 |
| 4513415 | Broadcast synchronization and supervision system A system is disclosed which employs existing broadcast stations to transmit synchronizing and supervisory signals for use by telephone communication devices at remote locations for timing purposes and for coordinating their activities with activities at o... | 04/23/1985 |
| 4511887 | Long range wireless alarm monitoring system A security system using a remote sensing unit and a transponder in either one-way or two-way radio communication with a central station. The security system provides for the continuous monitoring of remote points in a particular area from a central statio... | 04/16/1985 |
| 4509199 | Power supply systems for use in radio communication systems In a power supply system for use in a radio communication system comprising a base station for transmitting and receiving radio signals, one or more repeater stations for repeating the radio signals, and a terminal station communicating with the base stat... | 04/02/1985 |
| 4479256 | Two pilot frequency control for communication systems Apparatus for synchronizing the frequency of locally generated pilot signals with those of remotely generated pilot signals where frequency errors are introduced during transmission. A pair of demodulated pilot signals F1' and F2' are filtered and mixed t... | 10/23/1984 |
| 4470093 | Protective relay system and sampling synchronizing method therefor In a protective relay system for an electric power system with relay devices at respective terminals, a synchronous signal is transmitted from each terminal upon occurrence of a fixed time relation with the clock signal subsequent to receipt of a synchron... | 09/04/1984 |
| 4411007 | Distributed network synchronization system A synchronization system is provided for a tree-type transmission system comprising a central station connected to a plurality of remote stations in an effectively sequential manner, each station including transmitting and receiving means for digital data... | 10/18/1983 |
| 4375691 | Method and device for frequency translation A digital communications system includes a plurality of master stations communicating with a plurality of terminals over a single communication line which carries a plurality of duplex communication channels, each corresponding to a particular master stat... | 03/01/1983 |
| 4347626 | Radio telephone communication network In a relay station for use in a radio telephone network, which relay station includes a time storage unit composed of a time delay member connected to be switched, in response to recognition of a calling signal by its associated evaluator, from a reset st... | 08/31/1982 |
| 4312070 | Digital encoder-decoder A digital encoding and decoding system suited for use in a mobile trunked dispatch communication system capable of error correction, error detection, and detection of loss of synchronization. The encoder comprises a cyclic block encoder, an autosynchroniz... | 01/19/1982 |
| 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 sub-base station is provided with a detection means which is oper... | 11/17/1981 |
| 4234971 | Precise RF timing signal distribution to remote stations This invention relates to a method and apparatus for distributing a stable reference frequency from a hydrogen maser frequency standard, or similar RF source, to remote stations over great distances with very good phase stability, and with constant amplit... | 11/18/1980 |
| 4231114 | Synchronizing means for a two-way communication system Digitally encoded data is carried over a first channel between a base station and a plurality of mobiles with the mobiles sharing a second channel for transmission to the base on a contention basis. Proper decoding of the data requires clock syncing at th... | 10/28/1980 |
| 4219837 | Alarms between stations with relative motion An alarm or signalling system between a transmitter station and a receiver station either or both of which may be in motion. A signal is selectively radiated from the transmitter station for detection at the receiver station. The receiver station includes... | 08/26/1980 |
| 4208630 | Narrow band paging or control radio system The inventor discloses an ultra narrow band relatively ultra stable radio apparatus for communicting paging or control signals from a central transmitter to a multiplicity of remotely located receivers, which receivers may be carried on the person of indi... | 06/17/1980 |
| 4204167 | Electronic time piece automatic calibrating device An automatic timepiece calibrating device which utilizes the time signal given by any broadcasting station to provide calibration automatically once every 24 hours, a logic electronic timer device being adapted to switch on a receiver once in every 24 hou... | 05/20/1980 |
| 4145657 | Radio transmission system for two subscribers to have a mutual connection on one of several frequency channels and having time multiplex interlace of preferred channels A radio transmission system in which two subscribers use only one of possibly several frequency channels for a mutual connection is characterized in that in the individual frequency channel which is provided for the connection of the two subscribers the i... | 03/20/1979 |
| 4140972 | System for synchronizing synthesizers of communication systems Frequency synthesizers at first and second stations that communicate with each other via a transmission link having a constant propagation delay time are started and synchronized by transmitting a tone from the first station to the second station via the ... | 02/20/1979 |
| 4117661 | Precision automatic local time decoding apparatus The time detecting apparatus receives repetitive binary coded sets of data including time data in a predetermined format. The components of a single set of the received data representative of time are detected and stored. After a preselected time interval... | 10/03/1978 |
| 4117405 | Narrow-band radio communication system Ultra-narrow-band system for communication between a transmitter device and a receiver device provided by locking both to a carrier signal from a radio broadcast station and synthesizing a precise local frequency at each device as a preset multiple of the... | 09/26/1978 |
| 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 communication system that is as private as possible -- the commm... | 01/03/1978 |
| 4061974 | Ultra stable frequency distribution system A system for synchronizing a signal at a remotely located slave station with the phase and frequency of a signal generated at a master station. The signal transmitted at the master station and received by the slave station provides compensation for the ph... | 12/06/1977 |
| 4057758 | Mobile diversity radio communication system A diversity system in a mobile radio communication system provided with a plurality of antenna systems operating over a multipath medium in at least one of the sending path and the receiving path. At the sending path, a carrier wave frequency- or phase-mo... | 11/08/1977 |
| 4034295 | Radio communication system for simultaneous telecommunication between radio stations A radio communication system for simultaneous telecommunication between a calling station and a called station, in which an aural signal to be transmitted from the calling station is divided by sampling pulses in the form of clock pulses of low frequency ... | 07/05/1977 |
| 4023103 | Synchronizer for frequency hopping receiver A receiver of a fast frequency hopping (FFH) system is synchronized with a ending transmitter in three phases from a starting condition where the frequency hopping local signal leads the received signal prior to synchronization. During the first phase, the... | 05/10/1977 |
| 4001693 | Apparatus for establishing communication between a first radio transmitter and receiver and a second radio transmitter and receiver In a radio communication system having a command or base station and one or more controlled or mobile stations, the base station continuously transmits outbound function messages in binary bit form to the mobile stations. Each outbound function message co... | 01/04/1977 |
