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  2. Iridium Communications - Wikipedia

    en.wikipedia.org/wiki/Iridium_Communications

    Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded American company headquartered in McLean, Virginia, United States. Iridium operates the Iridium satellite constellation, a system of 75 satellites: 66 are active satellites and the remaining nine function as in-orbit spares. [2]

  3. Near vertical incidence skywave - Wikipedia

    en.wikipedia.org/wiki/Near_Vertical_Incidence...

    Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the medium distances range — usually 0–650 km (0–400 miles). It is used for military and paramilitary communications, broadcasting, [1] especially in the tropics, and by radio amateurs for nearby contacts circumventing line ...

  4. Direction finding - Wikipedia

    en.wikipedia.org/wiki/Direction_finding

    Direction finding antenna near the city of Lucerne, Switzerland. Direction finding ( DF ), or radio direction finding ( RDF ), is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an inadvertant source, a naturally-occurring radio source, or an illicit or enemy system.

  5. Stay Connected, Safe, and Worry-Free With the Best Satellite ...

    www.aol.com/lifestyle/satellite-messengers-easy...

    Montana 700i Satellite Communicator. $699.99. amazon.com. More. Garmin holds nothing back in the Montana series. The 700i has a full-color 5-inch touchscreen that’s 50 percent larger than the ...

  6. Defense Advanced GPS Receiver - Wikipedia

    en.wikipedia.org/wiki/Defense_Advanced_GPS_Receiver

    The AN/PSN-13 Defense Advanced GPS Receiver ( DAGR; colloquially, " dagger ") is a handheld GPS receiver used by the United States Department of Defense and select foreign military services. It is a military-grade, dual-frequency receiver, and has the security hardware necessary to decode the encrypted P (Y)-code GPS signals .

  7. Satellite phone - Wikipedia

    en.wikipedia.org/wiki/Satellite_phone

    Satellite phone ( Inmarsat) in use in Nias, Indonesia, in April 2005 after the Nias–Simeulue earthquake. A satellite telephone, satellite phone or satphone is a type of mobile phone that connects to other phones or the telephone network by radio link through satellites orbiting the Earth instead of terrestrial cell sites, as cellphones do.

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