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| Number | Title | Issue Date |
| 4628537 | System for identifying a responding station for a radio communications system A communications system for identifying a responding station called by a communications system caller station over a call channel and a plurality of speech channels. The system transmits information from the caller station, such as the selected speech cha... | 12/09/1986 |
| 4618997 | Portable transceiver A micrprocessor-controlled, frequency-synthesized radio transceiver system comprise a microprocessor for controlling the synthesis of local-oscillator frequencies for both the transmitting and receiving of radio signals. The microprocessor has a predeterm... | 10/21/1986 |
| 4618998 | Radio communications control system which automatically returns the system to the speech channel A radio communications system having a call channel and a plurality of speech channel one of which is to be selected, is provided with means for returning to a last used speech channel in the event that a call is required within a predetermined time perio... | 10/21/1986 |
| 4608712 | Spontaneous channel continuity scanning radio An improved channel scanning radio which automatically monitors a channel being monitored by the scanning circuitry at the time of the microphone is taken off-hook by treating that channel as a priority channel for a short period after the microphone is r... | 08/26/1986 |
| 4547777 | Method of radio-position-finding through determination of phases of electromagnetic waves and receiving device for practicing the method A method of radio-position-finding by means of mapped contour lines of iso-phase shift between two radio-frequency waves separated by a low frequency and transmitted by a group of foci stations also emitting a reference wave associated with said two radio... | 10/15/1985 |
| 4528522 | FM Transceiver frequency synthesizer A frequency synthesizer used for a frequency modulation (FM) transceiver which uses negative feedback to make the modulation characteristics linear and stable over a wide frequency range. The negative feedback is comprised of a frequency mixer, which mixe... | 07/09/1985 |
| 4503513 | Radio receiver system including a control unit and a remote unit An automobile radio receiver system includes a control unit located in the passenger compartment and a remote unit, for example, in the trunk compartment of the automobile. The control unit includes a master microcomputer which controls a display and resp... | 03/05/1985 |
| 4491966 | Maritime telecommunications system A radio system for automated ship board operation includes a plurality of radio receivers and a plurality of radio transmitters. The system includes an ARQ unit, with which one of the receivers and one of the transmitters is associated. A DSELCALL unit is... | 01/01/1985 |
| 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. The microprocessor is coupled by a data interface unit and ... | 12/04/1984 |
| 4484357 | Spontaneous channel continuity scanning radio An improved channel scanning radio which automatically monitors a channel being monitored by the scanning circuitry at the time of the microphone is taken off-hook by treating that channel as a priority channel for a short period after the microphone is r... | 11/20/1984 |
| 4484355 | Handheld transceiver with frequency synthesizer and sub-audible tone squelch system A handheld transceiver providing separate selective communications links for transmission and reception on a single carrier frequency by means of independent carrier and sub-audible tone frequencies in transmit and receive modes. A carrier frequency synth... | 11/20/1984 |
| 4479247 | Electronic channel selector Disclosed is an electronic channel selector comprising a plurality of diodes in series with a plurality of crystals, each diode/crystal connection defining one channel of the ten channel crystal-controlled oscillator. Non-enabled diodes are maintained in ... | 10/23/1984 |
| 4468814 | Radio channel visual identification system A visual identification system for a multi-channel radio having a channel selector switch is provided which produces a flashing light visible in all directions identifying the selected radio channel. The visual identification system comprises a plurality ... | 08/28/1984 |
| 4434504 | Channeling and decode circuit for airborne radio-telephone systems An airborne radio-telephone transceiver is provided having improved channeling and decode circuitry compatible with the selective signalling call-up system prescribed by the Federal Communications Commission. The decode circuitry includes a filter and det... | 02/28/1984 |
| 4430755 | Portable radio telephone A system for radio-telephone communication between a user at a remote location and the commercial telephone system or between two users at remote locations comprises a fixed terminal that is connected by wire lines or the like to the commercial telephone ... | 02/07/1984 |
| 4404685 | Frequency control system for radio apparatus employing filter amplifier operated at harmonic of frequency of synthesized signal source An improved frequency control system for radio apparatus is provided, which is especially advantageous for employment in portable, battery powered, multichannel, radio transceivers.The system involves both individual and combinational type improvements re... | 09/13/1983 |
| 4403342 | Zone switching system for a frequency synthesized transceiver A frequency synthesized transceiver capable of tuning to a plurality of communication channels is disclosed. The transceiver includes a receiver section and a transmitter section which are coupled to the synthesizer which generates the appropriate injecti... | 09/06/1983 |
| 4394775 | Frequency division communication system wherein conventional transmitter-transceiver can be used as a repeater or local base station Frequency division communication system wherein conventional transmitter-transceiver can be used as or repeater or local base station. No additional transmitter and receiver are required to adapt transceiver to function as interchannel repeater.... | 07/19/1983 |
| 4394776 | Priority channel system for a synthesized transceiver A frequency synthesized transceiver capable of tuning to a plurality of communication channels is disclosed. The transceiver includes a receiver section and a transmitter section which are coupled to the synthesizer which generates the appropriate injecti... | 07/19/1983 |
| 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 |
| 4373205 | Radio subscriber system with efficient use of radio frequency carrier waves A radio subscriber system switches between a plurality of radio link channels and seizes one responsive to an idle tone appearing thereon. A control circuit uses a microprocessor to select transmit and receive carrier frequencies for the seized channel. T... | 02/08/1983 |
| 4371978 | Automatic tuning system An automatic tuning system for controlling the avionics in an aircraft includes an operator actuated keyboard for entering any available frequency for the many avionic receiver/transmitters and/or transponders employed in the aircraft. Signals from the ke... | 02/01/1983 |
| 4357710 | Radio apparatus Radio apparatus and in particular VHF transmitter and receiver apparatus for aeronautical use comprises a frequency synthesizer 17 which is able to generate any desired frequency within the range of the radio and a number of frequency channel selection de... | 11/02/1982 |
| 4317222 | Transceiver/receiver information multiplexing system A radio transceiver is disclosed having manual controls on a microphone and the remainder of the circuitry located in a main chassis. The microphone and chassis are connected by means of a multiconductor cable, and time sharing multiplexing techniques are... | 02/23/1982 |
| 4287599 | Multi-channel communication device with manual and automatic scanning electronic channel selection A transceiver is disclosed that has a manual scanning electronic channel selection switch with a single actuator that can readily select any one of a predetermined plurality of discrete channels by step tuning the transceiver to each of the discrete chann... | 09/01/1981 |
| 4270213 | Sequential channel selector system A channel selector system in a radio for sequentially selecting one of a plurality of channels and rapidly scanning through any restricted channels such that the restricted channels are not displayed and appear to be skipped. The radio includes a frequenc... | 05/26/1981 |
| 4267597 | Marine telephone radio An improved marine radio telephone is disclosed having a microphone, display, speaker, and controls. The controls include switches and a keyboard located together with a display in a panel, a microphone conveniently located as to the front panel, and a pu... | 05/12/1981 |
| 4264979 | Display device for CB radio A display panel for a CB transceiver is disclosed which identifies to others the channel being used by the operator and other information such as the operator's code name or that the operator needs emergency assistance. The display panel is adapted to be ... | 04/28/1981 |
| 4254504 | Control apparatus for a transceiver employing a programmable memory A transceiver is controlled in operation by a programmable read only memory (PROM). The memory is accessed directly via a series of switches and when accessed, provides output data necessary to control the operation of the transceiver by controlling the f... | 03/03/1981 |
| 4247951 | Frequency synthesizer with unauthorized frequency inhibiting means A radio which has assigned frequencies or channels for operation is prevented from operating on other channels. The frequency synthesizer in the radio is a large scale integrated circuit in a single semiconductor chip which is controlled by input codes fr... | 01/27/1981 |
| 4232390 | Mobile radio vehicle control system A driver-operated electronic push-button control system is provided for installation and use within a mobile radio vehicle, which control system is capable of operating and controlling a plurality of radio transmitter/receiver communication units, and of ... | 11/04/1980 |
| 4216545 | Method and apparatus of communicating emergency signals from a transceiver in a transceiver communication network, particularly for citizen-band emergency use To alert users of Citizen-Band (CB) radios of an emergency situation, a CB transceiver has a tone generator associated therewith generating an emergency signal, for example a high pitched tone. Upon operation of an emergency switch, the transceiver is pla... | 08/05/1980 |
| 4216546 | Frequency bandwidth tuning system and method An electronic system for scanning across a range of received signals and aining a digital representation of a predetermined position, for example, the mid-point, of the bandwidth of the received signal, without having to ascertain directly the frequency ... | 08/05/1980 |
| 4207522 | Programmable frequency scanning radio system A frequency scanning radio system and programming means for selecting the frequencies to be used, and to determne whether or not the channels are in use. The programming means controls not only the direction but also the speed of the frequency scanning in... | 06/10/1980 |
| 4199721 | Hand-held microphone for transceiver Hand-held microphone consisting of a housing which is of such a size that said housing can be easily held by one hand, said housing including a rotary switch means which generates a digital coded signal for individually selecting one of preset frequencies... | 04/22/1980 |
| 4198601 | Control unit for transceiver A control unit for the transceiver characterized in that the whole operating portions of the transceiver is built into a housing of such a size which makes it easy to grip by one hand and the operator can remote-control the transceiver, holding the housin... | 04/15/1980 |
| 4198605 | Channel selecting apparatus in a receiver A superheterodyne receiver comprising a high frequency amplifier, a local oscillator implemented by a frequency synthesizer including a phase locked loop, a mixer, an intermediate frequency amplifier, an up down counter for providing data concerning frequ... | 04/15/1980 |
| 4197498 | Remote control system in a radio transceiver In a radio transceiver having a transceiver unit and a remote control unit, a remote control system in which the operation of the transceiver unit is controlled by control signals coupled synchronously from the remote control unit. The remote control unit... | 04/08/1980 |
| 4186342 | Marine radio telephone An improved marine radio telephone is disclosed which has a housing having an angular opening suitable for either above or below eye level installation and a chassis having printed wiring board support members including a tiltable front panel support memb... | 01/29/1980 |
| 4185240 | Channel selector system A transceiver channel selection circuit operable in both transmit and receive modes of operation including a digital phase lock circuit having a controllable oscillator, a reference frequency source, and means for obtaining a signal, the frequency of whic... | 01/22/1980 |
