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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  3. List of amateur radio modes - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio_modes

    Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode. Hellschreiber, also referred to as either Feld-Hell, or Hell a facsimile-based teleprinter. Discrete multi-tone modulation modes such as Multi Tone 63 (MT63) Multiple frequency-shift keying (MFSK) modes such as. FSK441, JT6M, JT65, and FT8.

  4. Rayon - Wikipedia

    en.wikipedia.org/wiki/Rayon

    Rayon, also called viscose [1] and commercialised in some countries as sabra silk or cactus silk, [2] is a semi-synthetic fiber, [3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [4] It has the same molecular structure as cellulose.

  5. Common Infrared Countermeasures program - Wikipedia

    en.wikipedia.org/wiki/Common_Infrared...

    CIRCM, the Common Infrared Countermeasures program, is a United States Army initiative intended to develop a lightweight, low-cost and modular laser-based infrared protection system for U.S. helicopters and light fixed-wing aircraft. The technology will primarily provide defense against shoulder-fired, heat-seeking missiles, or MANPADS.

  6. Spatial ability - Wikipedia

    en.wikipedia.org/wiki/Spatial_ability

    Spatial ability or visuo-spatial ability is the capacity to understand, reason, and remember the visual and spatial relations among objects or space. [1] Visual-spatial abilities are used for everyday use from navigation, understanding or fixing equipment, understanding or estimating distance and measurement, and performing on a job.

  7. Situation awareness - Wikipedia

    en.wikipedia.org/wiki/Situation_awareness

    Situational awareness or situation awareness (SA) is the understanding of an environment, its elements, and how it changes with respect to time or other factors. Situational awareness is important for effective decision making in many environments.

  8. High-frequency Active Auroral Research Program - Wikipedia

    en.wikipedia.org/wiki/High-frequency_Active...

    The High-frequency Active Auroral Research Program ( HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere . The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high ...

  9. Awareness - Wikipedia

    en.wikipedia.org/wiki/Awareness

    Concept. Awareness is a relative concept. It may be focused on an internal state, such as a visceral feeling, or on external events by way of sensory perception. [3] It is analogous to sensing something, a process distinguished from observing and perceiving (which involves a basic process of acquainting with the items we perceive). [4]

  10. DEFCON - Wikipedia

    en.wikipedia.org/wiki/DEFCON

    DEFCON. The defense readiness condition ( DEFCON) is an alert state used by the United States Armed Forces. [1] [2] For security reasons, the US military does not announce a DEFCON level to the public. [1] The DEFCON system was developed by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands. [3]

  11. Ronald Reagan Ballistic Missile Defense Test Site - Wikipedia

    en.wikipedia.org/wiki/Ronald_Reagan_Ballistic...

    The Ronald Reagan Ballistic Missile Defense Test Site, commonly referred to as the Reagan Test Site (formerly Kwajalein Missile Range ), is a missile test range in Marshall Islands ( Pacific Ocean ). It covers about 750,000 square miles (1,900,000 km 2) and includes rocket launch sites at the Kwajalein Atoll (on multiple islands), Wake Island ...