Globalstar STX-3 Simplex Modem

Globalstar STX-3 Simplex Modem


The Globalstar STX3 module is the latest simplex modem offered by Globalstar. At around one third the size of the previous STX2, it is designed to transmit reliable one-way digital data communications through the Globalstar satellite network. It is suitable for integration into remote tracking and monitoring hardware.

Globalstar STX-3 Simplex Modem

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The STX 3 is a simplex satellite transmitter designed to send small packets of user defined data to a network of low earth orbiting (LEO) satellites using the Globalstar simplex satellite network. Data can be sent automatically, on a time or event driven basis. The received data is then forwarded to a user defined network interface that may be in the form of an FTP host, email account, or HTTP host where the user will interpret the data for further processing.

The STX3 is a surface mount module designed to attach to a user defined host PCB which must provide power, an RF connection to the transmit antenna, and communications with a host processor which will control the operation of the STX3. All electrical connections are provided via the castellated pads on the perimeter of the PCB.

The STX3's low-power consumption and small size make it a highly efficient device ready for integration in a wide variety of applications. The module can be used in a wide range of assets including liquid petroleum gas (LPG) tanks, water tanks, pipelines, electricity meters, cars, trucks, boats, human tracking devices and sea or land containers.

Note: All products utilizing the STX3 Simplex Module require Globalstar Network Certification. For more info please visit:

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  Standard Plan Light Plan Heavy Plan Unlimited Plan
Activation Fee $30.00 $30.00  $30.00  $30.00
Monthly Fee   $12.50 $14.50  $17.50  $30.00
Inclusive Messages 0 250  500  Unlimited




*No roll-over of unused messages is permitted from one billing preiod to the next.

*Subject to fair usage policy (minimum message transmission frequency every 30 mins)



  • Size: 1.13 x 0.81 x 0.162 inches
  • Operating Temperature Range: -40 to +85 °C
  • Digital Power Supply Operational Voltage: 2.0 to 5.0 Volts
  • RF Power Supply Voltage: 3.0 to 5.0 Volts

Key Features:

  • Increase reliability through multiple transmissions
  • Quick and easy installation into your OEM devices via standard AT commands
  • Programmable time of transmission or event
  • Low power consumption
  • Low cost


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