| Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568) |
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| 03/28/1989 | US4817203 Remote control system |
| 03/28/1989 | US4817198 Radio receiver |
| 03/28/1989 | US4817196 Apparatus for tuning the antenna of a miniature personal communications device |
| 03/28/1989 | US4817194 Radio having an invertible display with reversible controls |
| 03/28/1989 | US4817193 AM transmitter having single tuning means for oscllator, carrier isolator and antenna |
| 03/28/1989 | US4817192 Dual-mode AFC circuit for an SSB radio transceiver |
| 03/28/1989 | US4817191 Insulated container apparatus |
| 03/28/1989 | US4817167 Method of receiving frequency-modulated stereo multiplex signals |
| 03/28/1989 | US4817154 Method and apparatus for encoding and decoding speech signal primary information |
| 03/28/1989 | US4817151 Selective decoder for compatible FM stereophonic system utilizing companding of difference signal |
| 03/28/1989 | US4817146 Cryptographic digital signal transceiver method and apparatus |
| 03/28/1989 | US4817113 Range estimation using floating reference points |
| 03/28/1989 | US4817094 Fault tolerant switch with selectable operating modes |
| 03/28/1989 | US4816769 BPSK demodulator and FM receiver for digital data pagers |
| 03/23/1989 | WO1989002679A1 Head band |
| 03/23/1989 | WO1989002603A1 Method and apparatus for isolating faults in an antenna system |
| 03/23/1989 | DE3730399A1 Method and device for transmitting a digital signal |
| 03/23/1989 | DE3729922A1 Radio link with device to improve the signal-to-noise ratio |
| 03/22/1989 | EP0307910A2 Signal locating apparatus |
| 03/22/1989 | EP0307887A2 FM stereo demodulator |
| 03/22/1989 | CN2034756U Wireless pickup for music |
| 03/21/1989 | US4815142 Noise reduction device in an electroacoustic system |
| 03/21/1989 | US4815141 Apparatus and methods for removing unwanted components from a communications signal |
| 03/21/1989 | US4814715 Mixer arrangement for suppression of oscillator interference in quadrature demodulators |
| 03/21/1989 | CA1251586A1 Ensemble modem structure for imperfect transmission media |
| 03/21/1989 | CA1251543A1 Radio transmitter |
| 03/21/1989 | CA1251517A1 Internally register-modelled, serially-bussed radio system |
| 03/15/1989 | EP0307377A1 Apparatus for avoiding spectrum spreading when switching a transmitter on and off |
| 03/15/1989 | EP0306970A2 High-speed switching system in a radio-communication system including a plurality of main communication systems and a plurality of stand-by communication systems |
| 03/14/1989 | US4813057 Time domain radio transmission system |
| 03/14/1989 | US4812820 Electronic surveillance system and transceiver unit therefor |
| 03/14/1989 | US4812719 High voltage regulator in a television apparatus |
| 03/14/1989 | EP0231291A4 Electronic surveillance system and transceiver unit therefor. |
| 03/14/1989 | CA1251262A1 Rapid anti-jam frequency-hopping time synchronization |
| 03/09/1989 | WO1989002198A1 Fm communications system with improved response to rayleigh-faded received signals |
| 03/09/1989 | WO1989002197A1 Chill cask with radio |
| 03/09/1989 | WO1989002195A1 Device for coding and decoding sound broadcast signals |
| 03/09/1989 | DE3728590A1 Car radio receiver |
| 03/08/1989 | EP0306059A2 Telemetry system with signal booster for digital data transmission through a transmission line |
| 03/08/1989 | EP0305994A2 Data communication system having means for switching between main and stand-by apparatuses |
| 03/08/1989 | EP0305604A1 Receiver comprising parallel signal paths |
| 03/08/1989 | EP0305603A1 Gain and phase correction in a dual branch receiver |
| 03/08/1989 | EP0305602A1 Dual branch receiver |
| 03/08/1989 | EP0305555A1 Control module for a car radio |
| 03/08/1989 | EP0305385A1 Digital zero if selectivity section |
| 03/08/1989 | CN1031603A High-frequency head of a continuous-wave radar |
| 03/07/1989 | US4811421 Transmission power control device in a radio communication transmitting/receiving station |
| 03/07/1989 | US4811404 For attenuating the background noise |
| 03/07/1989 | US4811398 Method of and device for speech signal coding and decoding by subband analysis and vector quantization with dynamic bit allocation |
| 03/07/1989 | US4811362 Low power digital receiver |
| 03/07/1989 | US4811314 Portable compact disc player and vehicle audio apparatus with slidable tray for supporting compact disc player |
| 03/07/1989 | US4810977 Frequency modulation in phase-locked loops |
| 03/07/1989 | US4810976 Frequency doubling oscillator and mixer circuit |
| 03/07/1989 | CA1250911A1 Spread spectrum adaptive antenna interference canceller |
| 03/07/1989 | CA1250896A1 Method and apparatus for acquiring information using a relative phase deviation of the optical signal of a local oscillator of a homodyne receiver |
| 03/02/1989 | DE3827962A1 Filter zur unterdrueckung von oberflaechen-interferenzen fuer satellitenkommunikations-empfaenger Filter to suppress surface until-interferences for satellite communication-empfaenger |
| 03/01/1989 | EP0305301A1 Signal compressor circuit, in particular for telephone set |
| 03/01/1989 | EP0304923A2 Output processing circuit for radio frequency receiver |
| 03/01/1989 | EP0304849A1 Data transmission using a transparent tone-in band system |
| 03/01/1989 | EP0304813A2 Serial interface |
| 02/28/1989 | US4809356 Three-way power splitter using directional couplers |
| 02/28/1989 | US4809337 Audio noise gate |
| 02/28/1989 | US4809328 FM/FMX stereophonic receiver |
| 02/28/1989 | US4809316 Method for identifying operation modes of an antitheft system |
| 02/28/1989 | US4809315 Cordless telephone system |
| 02/28/1989 | US4809274 System for processing audio signals |
| 02/28/1989 | US4808981 Automotive electronic communication apparatus with theft disabling, particularly car radio or similar automotive audio equipment |
| 02/22/1989 | EP0304147A2 Transmitter having means for controlling out-of-band radiation |
| 02/22/1989 | CN1031306A Home unit for wireless digital telephone system |
| 02/21/1989 | US4807283 Method for adjusting the balancing impedance of a hybrid junction |
| 02/21/1989 | US4807248 Automatic resynchronization technique |
| 02/21/1989 | US4807052 Remotely controllable electronic apparatus |
| 02/21/1989 | US4806945 Receiving head end for polarized microwaves, parabolic aerial and receiving station equipped with such a receiving head end |
| 02/21/1989 | US4806930 Radio control transmitter which suppresses harmonic radiation |
| 02/21/1989 | US4806906 Data terminal |
| 02/15/1989 | EP0303410A2 Non-linear squelch circuit |
| 02/14/1989 | US4805232 For adorning the waist of pants |
| 02/14/1989 | US4805203 Cordless telephone system |
| 02/14/1989 | US4805193 Protection of energy information in sub-band coding |
| 02/14/1989 | US4804954 Battery saving method for portable communications receivers |
| 02/09/1989 | WO1989001264A1 Analog/digital data storage system |
| 02/08/1989 | EP0302146A1 A receiver for, and method to receive, frequency hopped signals |
| 02/07/1989 | US4803739 SSB communication system |
| 02/07/1989 | US4803487 Portable communications receiver with separate information presentation means |
| 02/07/1989 | US4803473 Transmitter cover |
| 02/07/1989 | US4803447 Three terminal remotely controlled SPDT antenna switch |
| 02/07/1989 | CA1249872A1 Transmitters |
| 02/01/1989 | EP0301770A2 Radio receiver having station format selection capability |
| 02/01/1989 | EP0301636A1 Transceiver arrangement for full-duplex data transmission comprising an echo canceller and povision for testing the arrangement |
| 02/01/1989 | EP0301240A2 Direct sequence digital spread spectrum modem |
| 01/31/1989 | US4802240 Synchronous receiving method for selective calling signal |
| 01/31/1989 | US4802239 Switch distributing apparatus for community reception |
| 01/31/1989 | US4802235 Subscriber unit for a flexible communication system |
| 01/31/1989 | US4802191 Data transmission using a transparent tone-in band system |
| 01/31/1989 | US4802171 Method for error correction in digitally encoded speech |
| 01/31/1989 | US4801890 Circuit arrangements for modifying dynamic range using variable combining techniques |
| 01/31/1989 | CA1249633A1 Channel switching system |
| 01/26/1989 | WO1989000791A1 Oscillator network for radio receiver |
| 01/25/1989 | EP0300524A1 Variable attenuating device for insertion between an emitter circuit and a load circuit |
| 01/25/1989 | EP0300395A2 Device for storing an electrical connecting cable |