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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Principle of operation When a racon receives a radar pulse, it responds with a signal on the same frequency which puts an image on the radar display. This takes the form of a short line of dots and dashes forming a Morse character radiating away from the location of the beacon on the normal plan position indicator radar display. The length of the line usually corresponds to the equivalent of a ...

  3. List of amateur radio modes - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio_modes

    Modes of communication Amateurs use a variety of voice, text, image, and data communications modes over radio. Generally new modes can be tested in the amateur radio service, although national regulations may require disclosure of a new mode to permit radio licensing authorities to monitor the transmissions. Encryption, for example, is not generally permitted in the Amateur Radio service ...

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    List of country calling codes Worldwide distribution of country calling codes. Regions are coloured by first digit.

  5. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    A telephone exchange name or central office name was a distinguishing and memorable name assigned to a central office. It identified the switching system to which a telephone was connected, and facilitated the connection of telephone calls between switching systems in different localities.

  6. Why a log of redacted Signal messages shines a light on ... - AOL

    www.aol.com/finance/why-log-redacted-signal...

    The tech industry is working to fix the longstanding lack of diversity in its senior ranks, but the problem continues to manifest itself again and again.

  7. Verification and validation - Wikipedia

    en.wikipedia.org/wiki/Verification_and_validation

    Verification is intended to check that a product, service, or system meets a set of design specifications. [6] [7] In the development phase, verification procedures involve performing special tests to model or simulate a portion, or the entirety, of a product, service, or system, then performing a review or analysis of the modeling results.

  8. ISO 3166-1 - Wikipedia

    en.wikipedia.org/wiki/ISO_3166-1

    ISO 3166-1 alpha-2 – two-letter country codes which are the most widely used of the three, [citation needed] and used most prominently for the Internet's country code top-level domains (with a few exceptions). ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 codes. ISO 3166-1 numeric – three ...

  9. The United States reaffirmed its commitment to the Philippines' security amid China's actions in the South China Sea, the White House said on Thursday after talks between the two countries ...