Satellite Transmitter

Globalstar has reduced the size of its Simplex Transmitter Unit (STX) by 2/3 to help customers design and build compact and efficient communications devices. Using the Globalstar Simplex data network, the STX3 allows information to be transmitted from areas well beyond the reach of reliable cellular coverage around the globe.

The STX3 provides additional opportunities to integrate satellite connectivity into products used for vehicle and asset tracking, remote data reporting and data logger reporting that have limited size requirements. Affordable pricing, low power consumption and its small size make the STX3 satellite transmitter a highly efficient device ready for integration in a wide variety of applications.

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  • Increases reliability through multiple transmissions
  • Global coverage
  • Low power consumption
  • Surface mount design
  • Versatile use: Module can be integrated for use in a wide range of applications including liquid petroleum gas (LPG) tanks, water tanks, pipelines, electricity, meters, cars, trucks, boats and sea or land containers


  • 1130 mils x 810 mils (28.70mm x 20.57mm)
  • Overall thickness of the board with components/shields is 163 mils (4.13 mm)

  • FCC CFR Part 25 Modular Certification
  • Industry Canada
  • CE Tested

  • Operates over the Globalstar Simplex Data Network


A typical OEM solution consists of:
• Simplex transmitter unit (STX-3)
• Application specific sensor(s)
• Standard interface controller board
• Batteries or AC Power
• Real time clock
• Patch antenna
Coverage Map
Orange Block Primary Coverage
Fringe Coverage Diagonal Lines Fringe Coverage
(Customers should expect to experience weakest signal)


Completion rates based on Remote Telemetry Units (RTU) that are set to transmit a single packet message 3-times (the original transmission plus 2-repeats) in the frequency appropriate for the given regions. This is an estimate of coverage only. Actual Remote Telemetry coverage may vary based on terminal location, terrain features, signal strength, and other factors affecting satellite communications. Coverage may vary. Specifications subject to change without notice. This map indicates areas of potential satellite coverage only. Actual availability of service in any particular country may be subject to government approval.