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              The most popular frequency ranges are shown below.
    There are two major frequency assignments.One is in the C-band, with thw uplink
    (transmission from ground to satellite)at approximately 6 GHz and the downlink
    (from satellite to ground)at about 4GHz.The others is in the Ku-band,with the
    uplink and downlinkin the range of 14GHz and 12GHz,respctively.