The SiK Telemetry Radio from Holybro, is a small, lightweight, and inexpensive open source radio platform that can transmit serial data more than 300m out of the box. The radio uses open source SiK firmware. This firmware allows for a simple serial cable replacement to transmit any serial data including telemetry, RTK correction data (RTCM), or simple Serial.print() statements without any configuration required.

This telemetry kit includes two radio modules, a microB USB cable, microB OTG cable, two JST-GH cables, two right-angled RP-SMA connectors, two 915MHz antennas, and Type-C Adapter. Each radio module in the kit features a transmit power of 100mW, a RX sensitivity of -117dB, a full duplex transparent serial link of 57600baud and are equipped with a microB USB and UART port for easy connectivity.

Both radios have a microB connector and use the FT230x USB to serial IC making it immensely easy to pass serial data from a remote radio to a base computer or cell phone. Radios are configured using simple AT commands. The provided JST-GH cables make connecting to the TX/RX pins of the radio a literal snap.

This radio is plug-n-play for all Pixhawk Standard and other Flight Controllers, providing the easiest ways to setup a telemetry connection between your Autopilot and a ground station. In order to use the Serial Telemetry Radio Kit with a different controller, you may need to cut the one of the provided JST-GH cables in half and tin the ends (for insertion into Arduino headers) or solder the connections to your remote unit (rover, weather station, Arduino, etc). Plug the other module into the USB port on your base station, computer, or cell phone.

A getting started guide is included in the Documents tab to help you set up this radio link for the Pixhawk drone controller but this link can be used for any serial data transmission.

• 2x Radio Modules with Antennas
• 1x Micro USB to USB-A cable
• 1x Micro-USB to Android OTG Adapter Cable
• 1x Micro USB to Type-C Adapter
• 1x JST-GH-6P to JST-GH-6P cable (for Pixhawk Standard FC)
• 1x JST-GH-6P to Molex DF13 6P (for Pix32, Pixhawk 2.4.6, etc.)

• 100 mW maximum output power (adjustable) -117 dBm receive sensitivity
• Open-source SiK firmware
• RP-SMA connector
• 2-way full-duplex communication through adaptive TDM UART interface
• Transparent serial link
• MAVLink protocol framing
• FT230X is a USB to BASIC UART IC
• Interchangeable air and ground modules 915 or 433MHz (you should purchase the model which is appropriate for your country/region)
• Micro-USB port
• 6-position JST-GH connector
• Supply voltage: 5V DC (from USB or JST-GH)
• Transmit current: 100mA at 20dBm
• Receive current: 25mA
• Serial interface: 3.3V UART
• Weight: 23g with antenna

• Ardupilot Tutorial on SIK Radios
• AT Command Set
• Quick Start Guide