About American Cellphone signals

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This forum contains 2 topics, and was last updated by  Jeff-T 2 years, 4 months ago.

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    • GSM-900, GSM-1800 and EGSM/EGSM-900
      GSM-900, GSM-1800 and EGSM/EGSM-900 GSM-900 and GSM-1800 are used in most parts of the world: Europe, Middle East, Africa, Australia, Oceania (and most of Asia). In South and Central America the following countries use the following:
      • Bolivia – GSM-850 and 1900
      • Paraguay – GSM-850 and 1900
      • Peru – GSM-1900
      • Costa Rica – GSM-1800
      • Brazil – GSM-850, 900, 1800 and 1900
      • Guatemala – GSM-850, GSM-900 and 1900
      • El Salvador – GSM-850, GSM-900 and 1900
      • Venezuela – GSM-850, GSM-900 and 1900
      GSM-900 uses 890–915 MHz to send information from the mobile station to the base station (uplink) and 935–960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. Guard bands 100 kHz wide are placed at either end of the range of frequencies. GSM-1800 GSM-1800 uses 1,710–1,785 MHz to send information from the mobile station to the base transceiver station (uplink) and 1,805–1,880 MHz for the other direction (downlink), providing 374 channels (channel numbers 512 to 885). Duplex spacing is 95 MHz. GSM-1800 is also called DCS (Digital Cellular Service) in the United Kingdom, while being called PCS in Hong Kong– to avoid confusion with GSM-1900 which is commonly called PCS in the rest of the world. Mobile Communication Services on Aircraft (MCA) uses GSM1800. GSM-850 and GSM-1900 GSM-850 and GSM-1900 are used in Argentina, Bolivia, Brazil, Canada, the United States and many other countries in the Americas.
      • GSM-850 uses 824–849 MHz to send information from the mobile station to the base station (uplink) and 869–894 MHz for the other direction (downlink). Channel numbers are 128 to 251.
      GSM-850 is also sometimes called GSM-800 because this frequency range was known as the "800 MHz band" (for simplification) when it was first allocated for AMPS in the United States in 1983. The term Cellular is sometimes used to describe the 850 MHz band, because the original analog cellular mobile communication system was allocated in this spectrum.
      • GSM-1900 uses 1,850–1,910 MHz to send information from the mobile station to the base station (uplink) and 1,930–1,990 MHz for the other direction (downlink). Channel numbers are 512 to 810.
      PCS is the original name in North America for the 1,900 MHz band. It is an initialism for Personal Communications Service. GSM-450 Another less common GSM version is GSM-450. It uses the same band as, and can co-exist with, old analog NMTsystems. NMT is a first generation (1G) mobile phone system which was primarily used in Nordic countries,Benelux, Alpine Countries, Eastern Europe and Russia prior to the introduction of GSM. It operates in either 450.4–457.6 MHz paired with 460.4–467.6 MHz (channel numbers 259 to 293), or 478.8–486 MHz paired with 488.8–496 MHz (channel numbers 306 to 340). The GSM Association claims one of its around 680 operator-members has a license to operate a GSM 450 network in Tanzania. However, currently all active public operators in Tanzania use GSM 900/1800 MHz. Overall, where the 450 MHz NMT band exists, it either still runs NMT, or its been replaced by CDMA. GSM-450 is a provision; it has not seen commercial deployment.  
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    • 2 years, 4 months ago


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