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  2. Daniel Hertz S.A. - Wikipedia

    en.wikipedia.org/wiki/Daniel_Hertz_S.A.

    Daniel Hertz S.A. is a high-performance audio company based in Switzerland. The company makes high-efficiency loudspeakers, power amplifiers, pre-amplifiers, integrated amplifiers, and audio processing software. Daniel Hertz provides consulting services to major companies like LG Electronics of Korea and semiconductor firm Intersil of the USA.

  3. Survival radio - Wikipedia

    en.wikipedia.org/wiki/Survival_radio

    AN/URC-11 - Operating at 243 megahertz (1.23 m), "A" versions replaced one audio tube with transistors. [8] AN/URC-10 - Subminiaturized, completely transistorized UHF radio sets consisting of a crystal-controlled receiver-transmitter, a 16-volt dry battery, and a power cable assembly. The unit operates on one channel in the 240–260 megahertz ...

  4. List of communications receivers - Wikipedia

    en.wikipedia.org/wiki/List_of_communications...

    This is a list of rack-mount or tabletop communications receivers that include short wave frequencies. This list does not include handheld, portable or consumer grade equipment. Those that include VHF or UHF can be termed wideband receivers, whereas those without HF would be termed scanners, or surveillance receivers.

  5. Hertz Systems - Wikipedia

    en.wikipedia.org/wiki/Hertz_Systems

    Hertz Systems Ltd is a Polish company based in Zielona Gora that utilizes space technology for both the military and civilian markets, primarily relying on GPS navigation. Hertz Systems cooperates with, among others, the European Space Agency , [ 1 ] the Polish Space Agency , the Space Research Center of Polish Academy of Sciences and NATO ...

  6. Marine VHF radio - Wikipedia

    en.wikipedia.org/wiki/Marine_VHF_radio

    Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.

  7. List of United States Coast Guard radio stations - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Besides broadcast messages, Coast Guard stations handle direct traffic between aircraft, cutters, boats, and shore stations on VHF, MF, and HF frequencies, including the HF Data Link encrypted e-mail system and Digital Selective Calling (DSC), which uses radio telephone to send digitally encrypted signals to either one receiver or a group or ...

  8. Optonica - Wikipedia

    en.wikipedia.org/wiki/Optonica

    Optonica amplifier (SM-3636) and tuner (ST-3636) from 1978. The Optonica brand was created and first launched by Sharp of Japan in 1975 to compete in the high-end audio market along with established brands such as Sansui Electric, Sony, Panasonic, Sanyo, Yamaha, Nakamichi, Onkyo, Fisher Electronics, Technics (brand), Pioneer Corporation, Kenwood Corporation, JVC, Harman Kardon and Marantz.

  9. Decca Navigator System - Wikipedia

    en.wikipedia.org/wiki/Decca_Navigator_System

    The Decca Navigator System was a hyperbolic radio navigation system that allowed ships and aircraft to determine their position by using radio signals from a dedicated system of static radio transmitters. The system used phase comparison between pairs of low frequency signals between 70 and 129 kHz, as opposed to pulse timing systems like Gee ...