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  • AMPS (EIA/TIA-553) and NAMPS (IS-91)

    Mobile Frequency Range Rx: 869-894; Tx 824-849
    Multiple Access Method FDM
    Duplex Method FDD
    Number of Channels 832
    Channel Spacing 30kHz
    Modulation FM


    AMPS (Advanced Mobile Phone Service) was the first cellular mobile system in the United States. AMPS operates as an analog system using 30 kHz wide channels.


    AMPS was later enhanced to NAMPS (Narrowband Advanced Mobile Phone Service), a version of AMPS that uses 10 kHz channels and by doing so triples cellular capacity.

    AMPS by Any Other Name

    Europeans often refer to AMPS as "American Mobile Phone Service." Digital cellular equipment manufacturers and carriers often refer to AMPS as "Analog Mobile Phone Service."

    AMPS Standards

    AMPS is defined in the EIA/TIA-553 standards. NAMPS is defined in the TIA/EIA/IS-91 standard.

    AMPS Network Operators

    AT&T Wireless operates a NAMPS network in the United States.

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    One comment
    1. vivian

      2 June, 2016 at 7:39 am

      Cell phone jammers can really be a good item to keep the phones quiet in the public places. Although it is traditionally used in military field, it can be taken into application in many other circumstances I think.

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