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  2. Air traffic control radar beacon system - Wikipedia

    en.wikipedia.org/wiki/Air_traffic_control_radar...

    There have been a number of modes used historically, but four are in common use today: mode 1, mode 2, mode 3/A, and mode C. Mode 1 is used to sort military targets during phases of a mission. Mode 2 is used to identify military aircraft missions. Mode 3/A is used to identify each aircraft in the radar's coverage area.

  3. Aviation transponder interrogation modes - Wikipedia

    en.wikipedia.org/wiki/Aviation_transponder...

    Provides 2-digit 5-bit mission code (cockpit selectable) [1] 2: Provides 4-digit octal unit code (set on ground for fighters, can be changed in flight by transport aircraft) [1] 3: A: Provides a 4-digit octal identification code for the aircraft, set in the cockpit but assigned by the air traffic controller. Mode 3/A is often combined with Mode ...

  4. Sensitive compartmented information facility - Wikipedia

    en.wikipedia.org/wiki/Sensitive_compartmented...

    ICD 705 is a three-page capstone document that implements Intelligence Community Standard (ICS) 705-1, ICS 705-2 and the Technical Specifications for Construction and Management of Sensitive Compartmented Information Facilities or "Tech Specs." The latest version of the Tech Specs was published in March 2020 (Version 1.5). [9]

  5. 7.1 surround sound - Wikipedia

    en.wikipedia.org/wiki/7.1_surround_sound

    7.1 surround sound is the common name for an eight-channel surround audio system commonly used in home theatre configurations. It adds two additional speakers to the more conventional six-channel ( 5.1) audio configuration. As with 5.1 surround sound, 7.1 surround sound positional audio uses the standard front left and right, center, and LFE ...

  6. Lockheed X-7 - Wikipedia

    en.wikipedia.org/wiki/Lockheed_X-7

    United States Air Force. Developed into. AQM-60 Kingfisher. A Lockheed X-7 on public display in New Mexico. The Lockheed X-7 (dubbed the "Flying Stove Pipe") was an American unmanned test bed of the 1950s for ramjet engines and missile guidance technology. It was the basis for the later Lockheed AQM-60 Kingfisher, a system used to test American ...

  7. 2-8-2 - Wikipedia

    en.wikipedia.org/wiki/2-8-2

    Overview. The 2-8-2 wheel arrangement allowed the locomotive's firebox to be placed behind instead of above the driving wheels, thereby allowing a larger firebox that could be both wide and deep. This supported a greater rate of combustion and thus a greater capacity for steam generation, allowing for more power at higher speeds.

  8. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 8 uses four 2-digit codes (81, 82, 84, 86) and four sets of 3-digit codes (80x, 85x, 87x, 88x) to serve East Asia, South Asia and special services. 83x and 89x are unallocated. Zone 9 uses seven 2-digit codes (90–95, 98) and three sets of 3-digit codes (96x, 97x, 99x) to serve the Middle East , West Asia , Central Asia , parts of South ...

  9. Mode 7 - Wikipedia

    en.wikipedia.org/wiki/Mode_7

    Mode 7. This basic Super NES demo uses Mode 7. Mode 7 is a graphics mode on the Super Nintendo Entertainment System video game console that allows a background layer to be rotated and scaled on a scanline-by-scanline basis to create many different depth effects. [ 1] It also supports wrapping effects such as translation and reflection. [ 2]