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  2. Avalanche transceiver - Wikipedia

    en.wikipedia.org/wiki/Avalanche_transceiver

    An avalanche transceiver or avalanche beacon is a type of emergency locator beacon, a radio transceiver (a transmitter and receiver in one unit) operating at 457 kHz for the purpose of finding people buried under snow. They are widely carried by skiers, particularly back country skiers for use in case a skier is buried by an avalanche.

  3. Avalanche rescue - Wikipedia

    en.wikipedia.org/wiki/Avalanche_rescue

    Avalanche Transceivers — known as beacons, "beepers", peeps (pieps), ARVAs (Appareil de Recherche de Victimes en Avalanche, in French), LVS (Lawinen-Verschütteten-Suchgerät, Swiss German), or various other trade names, are important for every member of the party. They emit a "beep" via 457 kHz radio signal in normal use, but may be switched ...

  4. Space–time block code - Wikipedia

    en.wikipedia.org/wiki/Space–time_block_code

    Space–time block coding is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data transfer.

  5. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...

  6. X Band Satellite Communication - Wikipedia

    en.wikipedia.org/wiki/X_Band_Satellite_Communication

    x Band Satellite Communication operates in the part of the X band or Super High Frequency (SHF) spectrum which is designated by the International Telecommunication Union (ITU) for satellite communication, which is those frequencies in the range 7.25 GHz to 7.75 GHz (Space to Earth) and 7.9 GHz to 8.4 GHz (Earth to Space). [1]

  7. High Frequency Global Communications System - Wikipedia

    en.wikipedia.org/wiki/High_Frequency_Global...

    The High Frequency Global Communications System (HFGCS) is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy surface assets.

  8. Tropospheric scatter - Wikipedia

    en.wikipedia.org/wiki/Tropospheric_scatter

    Boswell Bay, Alaska White Alice Site, Tropospheric scatter antenna and feeder. Pacific Scatter System Tropospheric scatter , also known as troposcatter , is a method of communicating with microwave radio signals over considerable distances – often up to 500 kilometres (310 mi) and further depending on frequency of operation, equipment type ...

  9. List of VLF-transmitters - Wikipedia

    en.wikipedia.org/wiki/List_of_VLF-transmitters

    Antenna dismantled, deteriorating transmitter building and Haiku Stairs remain Bratland - Omega Station A (LEA) Brattland, Norway: 12.1 kHz: 11,500-foot (3,500 m) valley span antenna over salt water. dismantled in 2002. Building and helix house remains

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