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  2. Dial-up Internet access - Wikipedia

    en.wikipedia.org/wiki/Dial-up_Internet_access

    Dial-up Internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telephone line. Dial-up connections use modems to decode audio signals into data to send to a router or ...

  3. The Duel: Test Drive II - Wikipedia

    en.wikipedia.org/wiki/The_Duel:_Test_Drive_II

    The Duel: Test Drive II. Cover art for PC versions which feature the 1989 Ferrari F40 (top) and the 1989 Porsche 959 (bottom). The Duel: Test Drive II is a 1989 racing video game developed by Distinctive Software and published by Accolade for Amiga, Amstrad CPC, Apple IIGS, Commodore 64, MS-DOS, MSX, ZX Spectrum, Atari ST, Sega Genesis and SNES .

  4. High-speed multimedia radio - Wikipedia

    en.wikipedia.org/wiki/High-speed_multimedia_radio

    High-speed multimedia radio ( HSMM) is the implementation of high-speed wireless TCP/IP data networks over amateur radio frequency allocations using commercial off-the-shelf (COTS) hardware such as 802.11 Wi-Fi access points. This is possible because the 802.11 unlicensed frequency bands partially overlap with amateur radio bands and ISM bands ...

  5. Spectrum analyzer - Wikipedia

    en.wikipedia.org/wiki/Spectrum_analyzer

    A spectrum analyzer is also used to determine, by direct observation, the bandwidth of a digital or analog signal. A spectrum analyzer interface is a device that connects to a wireless receiver or a personal computer to allow visual detection and analysis of electromagnetic signals over a defined band of frequencies.

  6. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light (or simply light). The optical spectrum is sometimes considered to be the same as the visible spectrum, but some authors define the term more broadly, to include the ...

  7. Radio frequency - Wikipedia

    en.wikipedia.org/wiki/Radio_frequency

    Radio frequency. Radio frequency ( RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency [1] range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infrared ...

  8. Shock response spectrum - Wikipedia

    en.wikipedia.org/wiki/Shock_response_spectrum

    A Shock Response Spectrum (SRS) [1] is a graphical representation of a shock, or any other transient acceleration input, in terms of how a Single Degree Of Freedom (SDOF) system (like a mass on a spring) would respond to that input. The horizontal axis shows the natural frequency of a hypothetical SDOF, and the vertical axis shows the peak ...

  9. 3G - Wikipedia

    en.wikipedia.org/wiki/3G

    3G is the third generation of wireless mobile telecommunications technology. It is the upgrade to 2G, 2.5G, GPRS and 2.75G Enhanced Data Rates for GSM Evolution networks, offering faster data transfer, and better voice quality. [1] This network was superseded by 4G, and later by 5G. This network is based on a set of standards used for mobile ...

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