| 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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| 03/18/1980 | US4193686 Counting circuit for determining the incoming frequency or received channel in a high-frequency superhet receiver |
| 03/18/1980 | CA1073973A1 Current control circuit |
| 03/18/1980 | CA1073820A1 System for reducing noise transients in recorded sound signals |
| 03/11/1980 | US4193035 Circuit arrangement for receiving one of the sidebands from a double sideband signal |
| 03/11/1980 | US4193030 Frequency hopping communication system |
| 03/11/1980 | US4192978 Operational amplifier hybrid system |
| 03/11/1980 | US4192970 Reduction of adjacent channel interference |
| 03/04/1980 | US4191926 Method and apparatus for interference cancellation at base-band using multiplication of the desired interfering carriers |
| 03/04/1980 | US4191858 Block digital processing system for nonuniformly encoded digital words |
| 03/04/1980 | US4191851 FM Noise suppressor |
| 03/04/1980 | US4191850 Interferences reduction for use in an FM radio receiver |
| 03/04/1980 | CA1073076A1 Beat frequency interference rejection circuitry |
| 03/04/1980 | CA1073053A1 Repeater monitoring and fault location |
| 02/26/1980 | US4190821 Self-healing loop communications system |
| 02/26/1980 | US4190806 Circuit arrangement for the selective compression or expansion of the dynamic range of a signal |
| 02/26/1980 | US4190803 Multifrequency superheterodyne receiver with priority channel monitoring |
| 02/26/1980 | US4190747 Signal corrected optocoupled device |
| 02/26/1980 | CA1072641A1 Noise suppression device |
| 02/26/1980 | CA1072638A1 Transceiver audio system |
| 02/20/1980 | EP0007943A1 Television system scheduler |
| 02/19/1980 | US4189679 Noise detecting circuit having noise-immune AGC |
| 02/19/1980 | US4189677 Demodulator unit for spread spectrum apparatus utilized in a cellular mobile communication system |
| 02/19/1980 | US4189676 Switching system utilizing flexible circuit with transmission line for matched impedance connections |
| 02/19/1980 | US4189625 Method and apparatus for processing dual frequency digital information signals |
| 02/12/1980 | US4188585 Synchronized receiver power system |
| 02/12/1980 | US4188582 Simulcast transmission system having phase-locked remote transmitters |
| 02/12/1980 | US4188579 SSB transceiver |
| 02/06/1980 | EP0007914A1 Manually operated tuning means |
| 02/05/1980 | US4187478 Noise reduction system having specific encoder circuitry |
| 02/05/1980 | US4187477 Noise reduction system |
| 02/05/1980 | US4187473 Electronic phase locked loop circuit |
| 02/05/1980 | US4187467 Grounded RF power amplifier circuit apparatus |
| 02/05/1980 | CA1071308A1 Pulse code modulation with dynamic range limiting |
| 01/29/1980 | US4186396 Radar beacon apparatus |
| 01/29/1980 | US4186380 Multi-terminal computer system with dual communication channels |
| 01/29/1980 | US4186351 Signal strength indicator circuit for a radio receiver employing AGC |
| 01/29/1980 | US4186350 Antenna tuning circuit |
| 01/29/1980 | US4186349 Adaptive narrow band noise estimator/suppressor radio receiver |
| 01/29/1980 | US4186346 Amplitude modulated transmitter |
| 01/29/1980 | US4186344 Frequency converter |
| 01/29/1980 | US4186343 Synchronous frequency synthesis method for a radio trnsmitter-receiver |
| 01/29/1980 | US4186342 Marine radio telephone |
| 01/29/1980 | CA1070841A1 Digital correlation receivers |
| 01/29/1980 | CA1070840A1 Cross-correlation arrangement |
| 01/22/1980 | US4185242 Signal-to-noise ratio measurement of intermittent signals |
| 01/22/1980 | US4185241 Communications system using time position modulation and correlation slope demodulation |
| 01/22/1980 | US4185240 Channel selector system |
| 01/22/1980 | CA1070391A1 Automatic noise limiter |
| 01/15/1980 | US4184119 Radio equipped space toy |
| 01/15/1980 | US4184115 Mobile citizen band transceiver control unit with an audio frequency apparatus |
| 01/15/1980 | CA1069979A1 Radio relay system |
| 01/09/1980 | EP0006807A1 Arrangement for a multiplexed hertzian channel |
| 01/09/1980 | EP0006325A1 Data transmission system for interconnecting a plurality of data processing terminals |
| 01/08/1980 | US4183087 Peak deviation sampling |
| 01/08/1980 | US4182994 Phase locked loop tuning system including stabilized time interval control circuit |
| 01/08/1980 | US4182936 Transformerless trunk circuit |
| 01/08/1980 | CA1069629A1 Multi-band tuner with fixed broadband input filters |
| 01/08/1980 | CA1069588A1 Vestigial-sideband transmission system for synchronous data signals |
| 01/01/1980 | US4181970 Digital attenuator for compressed PCM signals |
| 01/01/1980 | US4181896 Device for optional dynamic compression or expansion |
| 01/01/1980 | US4181895 Amplifier with muting circuit |
| 01/01/1980 | US4181892 Sweeping noise blanker |
| 01/01/1980 | US4181890 Apparatus for receiving signals in plural frequency bands |
| 01/01/1980 | US4181889 Citizens band transmitter with overall envelope feedback from antenna coupling filter |
| 01/01/1980 | US4181887 Automatic channel selector for a two-way transceiver in a multichannel communication system |
| 01/01/1980 | US4181824 Balancing impedance circuit |
| 01/01/1980 | US4181822 Bandsplitter systems |
| 01/01/1980 | CA1069230A Channel selecting apparatus |
| 01/01/1980 | CA1069181A Radio receiver with plural converters and frequency control |
| 01/01/1980 | CA1069176A Muting control circuit for use with a power amplifier |
| 12/25/1979 | US4180776 Automatic channel scanning attachment for manual CB radio transceiver |
| 12/25/1979 | US4180299 Carrier |
| 12/25/1979 | CA1068834A Channel selecting apparatus for a television receiver with an electronic tuner |
| 12/18/1979 | CA1068350A1 Circuit arrangement for a stereo search device in a stereo decoder |
| 12/11/1979 | US4178551 Bandwidth switching circuits of radio receiver |
| 12/11/1979 | US4178548 Voice actuated mobile radio |
| 12/11/1979 | US4178547 Remote microphone with approved channel selector |
| 12/11/1979 | US4178485 Transformerless telephone line circuit |
| 12/11/1979 | CA1067986A1 Line protection switching system |
| 12/04/1979 | US4177430 Adaptive noise cancelling receiver |
| 12/04/1979 | US4177429 Switching arrangement for combination VHF-UHF tuners |
| 12/04/1979 | US4177428 Circuit arrangement for amplifying oscillator oscillations and converting same to rectangular signals |
| 12/04/1979 | US4177426 Radio control system with pluggable modules for changing system operating frequency |
| 11/28/1979 | EP0005592A1 A method of and an apparatus for automatically matching a radio frequency transmitter to an antenna |
| 11/27/1979 | US4176319 Double sideband transmission system |
| 11/27/1979 | US4176318 Radio transmitter display indicator |
| 11/27/1979 | CA1067153A1 Plural band, single/double conversion radio receiver |
| 11/20/1979 | US4175254 Selectively tunable heterodyne receiver |
| 11/20/1979 | CA1066781A1 Universal automotive electronic radio |
| 11/20/1979 | CA1066778A1 Code operated switching device for communications systems and the like |
| 11/15/1979 | WO1979000937A1 Intermediate frequency sensing circuit |
| 11/13/1979 | US4174470 Electronic hybrid |
| 11/13/1979 | CA1066421A1 Method and apparatus for uniquely encoding channels in a digital transmission system |
| 11/13/1979 | CA1066370A1 Method and apparatus for recovering data and clock information in a self-clocking data stream |
| 11/13/1979 | CA1066363A1 Radio receiver having co-channel interference operated squelch |
| 11/13/1979 | CA1066362A1 Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems |
| 11/06/1979 | US4173742 Antenna isolation device |
| 10/30/1979 | US4173003 Deltic (time compressor) with adjustable multiplication ratio |
| 10/30/1979 | US4172995 SSB transceiver |
| 10/30/1979 | CA1065464A1 Preselector cavity arrangement and rf selectivity assembly |