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  2. List of amateur radio modes - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio_modes

    Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.

  3. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    A radar beacon (racon) is a device that returns a distinctive signal when triggered by a radar, providing range, bearing and identification information. Learn about the principle of operation, the characteristics, the applications and the proposal for enhanced RACON.

  4. Foxit PDF Reader - Wikipedia

    en.wikipedia.org/wiki/Foxit_PDF_Reader

    Foxit PDF Reader is a freemium tool that can create, view, edit, and print PDF files. It is developed by Foxit Software and supports various platforms, including Windows, Mac OS, Android, and iOS.

  5. AOL Mail is free and helps keep you safe.

    mail.aol.com/?icid=aol.com-nav

    AOL Mail offers secure and personalized email accounts with features like AOL Mail, news, and weather. You can also access your email on the go with an iOS & Android app and get help from experts.

  6. Agenda 47 - Wikipedia

    en.wikipedia.org/wiki/Agenda_47

    Trump supported federal negotiation of drug prices during his 2016 campaign, however, as president, he did not pursue drug price negotiation and opposed a Democratic price negotiation plan. Recently, Trump said he 'will tell big pharma that we will only pay the best price they offer to foreign nations', claiming that he was the 'only president ...

  7. Artificial intelligence - Wikipedia

    en.wikipedia.org/wiki/Artificial_intelligence

    Artificial intelligence (AI) is intelligence exhibited by machines, particularly computer systems. It is a field of research that develops and studies methods and software that enable machines to perceive, learn, and act in their environment.

  8. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    PDF is a standardized file format developed by Adobe to present documents, including text, images, and multimedia, independently of software and platforms. Learn about the history, technical details, and features of PDF files.

  9. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    A comprehensive list of software used to manage Portable Document Format (PDF) documents, with links to articles on each software. The list covers creators, viewers, editors, converters, development libraries and other categories of PDF software.