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Stonex SR02 External UHF Radio Modem


The Stonex SR02 is a high power, external UHF radio modem for transmitting RTK corrections from a GNSS receiver.



The Stonex SR02 is a high power, external UHF radio modem for transmitting RTK corrections from a GNSS receiver. The
transmission power can be selected by the user from 0.5W to 2W reaching distances up to 10 km. The radio has numerous settings that can define communication protocols, channel width and transmission frequency, making it fully compatibile with other external radio modems or giving it the ability to be integrated with a GNSS receiver.

The SR02 modem is used to transmit RTK corrections from a base station, but it can also be used as a radio receiver. In addition, the retransmission function can be activated and the radio placed between a base and a rover increasing the coverage area of the RTK correction.

The connection of the SR02 radio with a GNSS receiver is done via serial port or via Bluetooth. Through Bluetooth mode, the SR02 radio can transform the receiver into a RTK rover receiver (network only) to work in the base/rover configuration. The Stonex S70G, S580 and S700A GNSS receivers can be connected to the SR02 radio via Bluetooth without external cables.

It is possible to use the PC software to interface with the radio allowing for quick and easy configuration. Through the integrated display, it is also possible to easily modify the configuration of the radio in the field.


  • Radio Modem 2W Power
  • Software for Simple Management
  • Full Operating Mode

Technical Specifications

Frequency: 410 – 470 MHz
Transmission Power: From 0.5W to 2W
Operating Mode: Receiver, Trasmitter, Repeater
Operating Voltage: 6V~9V
Frequency Stability: ±1ppm
Bluetooth: 2.0/2.1
User Interface: 1.9 inch LCD display 2, 16 character with navigation buttons
Data Modem
Data Rate: 4800/9600/19200 bps
Speed of Serial Interface: 9600/19200/38400/57600/115200 bps
Modulation: GMSK/4FSK
Protocols: Trasparent EOT, Trimmark3, Trimtalk, Satel
Channel Width: 12.5KHz/25KHz
Internal Battery: 6800 mAH Li-ion rechargeable
Continuous Working Period: 8h
Charging Time: 8h
Operating Voltage: 6V~9V
Protection Class: IP67
Material: Aluminium
Physical Specification
Weight: 560g
Dimensions: 150 x 83 ×31mm
Operating Temperature: -30°C to 65°C (-22°F to 131°F)
Storage Temperature: -50°C to 85°C (-58°F to 185°F)
Protection Class: IP67
Material: Aluminium


The SR02 external UHF radio modem from Stonex is available through TerrisGPS. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.

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Client Testimonials

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"Thank you for your prompt service. All seems to be working well again. Your techs were very helpful with the troubleshooting."
J.O. - Ground Navigation
"Thanks for all the troubleshooting help, also to John for his assistance and the prompt answers from you guys!"
F.A. - Survey Industry

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