The SiK Telemetry Radio by Holybro is a compact, lightweight, and cost-effective open source radio system that can transmit serial data over 300m without additional configuration. It utilizes the open source SiK firmware, enabling easy transmission of various serial data, including telemetry, RTK correction data, or simple Serial.print() statements.

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 a Type-C Adapter. Each radio module in the kit offers a 100mW transmit power, -117dB RX sensitivity, and a full duplex transparent serial link of 57600baud, along with microB USB and UART ports for effortless connectivity.

Both radios feature a microB connector and use the FT230x USB to serial IC, making it incredibly convenient to pass serial data between a remote radio and a base computer or cell phone. Configuring the radios is straightforward using simple AT commands, and the provided JST-GH cables ensure easy and secure connections to the TX/RX pins of the radio.

The radio system is plug-n-play compatible with Pixhawk Standard and other Flight Controllers, simplifying the setup of a telemetry connection between your Autopilot and a ground station. For use with a different controller, minor adjustments may be needed, such as cutting one of the provided JST-GH cables and tinning the ends for insertion into Arduino headers or soldering the connections to the remote unit. Once set up, simply plug the other module into the USB port on your base station, computer, or cell phone for seamless communication.

Features:

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