SATELLITE MODEMS

Satellite Modems

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  • IDP-110 Design Guide
  • Overview

    Satellite modems are communication devices that use a satellite as a gateway to the destination device. This page focuses on satellite modems designed for embedded applications.

    They typically have tight technical voltage supply specifications (such as 40mVp2p voltage ripple and the ability to momentarily provide 1.5A of current during transmit mode).

    Terminology

    TermDescription
    GlobalstarA popular manufacturer of satellite modems.
    IridiumA popular manufacturer of satellite modems.
    LEOLow earth orbit. This is an orbit which has an altitude between 160 and 2,000 kilometers above the earths surface.
    TNCA type of RF connector used for the antenna.
    SMAA type of RF connector used for the antenna.
    QuadrifilarA type of antenna used for satellite communications.

    Iridium

    The Iridium 9602 and 9603 are both burst-data only satellite modems designed for embedded systems.

    When the 9603 is in transmit mode, it can draw up to 1.5A (for an period of around 8.3ms), with an average transmit current of 190mA. When receiving, they can draw 195mA peak and 45mA average.

    Antennas

    Quadrifilar

    Quadrifilar antennas can come in packages which are cylindrical with dimensions such as 18mm in diameter and 48mm in length.


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