Stonex SR35 External UHF Radio Modem

Stonex SR35 External UHF Radio Modem

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The Stonex SR35 external UHF radio modem is a high power radio modem for transmitting RTK corrections from a basic GNSS receiver. The transmission power can be selectable by the user from 5W up to 35W reaching distances up to 50 km.



The Stonex SR35 external UHF radio modem is used to transmit RTK corrections from a base station, but can also be used as a radio receiver. In addition, the retransmission function can be activated, or the radio placed between a base and a rover increasing the coverage area of ​​the RTK correction. Finally, the Network Repeater functionality allows the SR35 to receive an RTK correction through the integrated GSM modem and retransmit it through the radio modem (Bridge Functionality).

The radio has numerous settings that can define communication protocols, channel width and transmission frequency, thus full compatibility with other external radio modems or integrated in a GNSS receiver. For a simple configuration of the radio it is possible to use the PC software or the APP developed in an Android environment which allows a fast and complete management of the SR35.

Technical Specifications

Frequency:410–470 MHz
Operating Modes:Transceiver
Radio Repeater
Network Repeater
Operating Voltage:9V~16V
Frequency Stability:±1ppm
Channels:Up to 200 programmable channels
(user selectable)
Data Modem
Data Rate:4800bps/9600bps/19200bps
Data Speed of Serial Interface:9600, 19200, 38400, 57600, 115200 bps
Protocols:Trasparent EOT
Channel Width:12.5KHz/25KHz
GSM Modem version USA
Network:4G: B2(1900), B4(AWS-1700), B5(850), B12/B13(700)
3G: B2(1900), B5(850)
Micro SIM card
GSM Modem version Europe
Network:4G: B1(2100), B3(1800), B7(2600), B8(900), B20(800)
3G: B2(2100), B8(900)
2G: B3(1800), B8(900)
Micro SIM card
Size:175 mm (H) × 130 mm (W) × 86.5 mm (D)
Weight:2 kg
Operating Temperature:-40°C to 65°C (-40°F to 131°F)
Storage Temperature:-50°C to 85°C (-58°F to 185°F)
Protection Class:IP67

Part Numbers

B45-460215 – SR35-E UHF Radio Modem Bundle (mainly dedicated for Europe but compatible for Asia and Africa)
B45-460216 – SR35-U UHF Radio Modem Bundle (mainly dedicated for USA but compatible for South America, Canada and Australia)

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for Stonex and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The SR35 external UHF radio modem from Stonex is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.