SiK Radio

SiK radio is a collection of firmware and tools for telemetry radios.

Information about using SiK Radio can be found it the PX4 User Guide: Telemetry > SiK Radio

The ("developer") information below explains how to build SiK firmware from source and configure it using AT commands.

Supported Radio Hardware

The SiK repository includes bootloaders and firmware for the following telemetry radios (2020-02-25):

  • HopeRF HM-TRP
  • HopeRF RF50-DEMO
  • RFD900
  • RFD900a
  • RFD900p
  • RFD900pe
  • RFD900u
  • RFD900ue

The SiK repository does not currently firmware for RFD900x or RFD900ux telemetry radios**. In order to update firmware on these radios (for instance, in order to support MAVLink v2.0), the following process is suggested:

  1. Download the appropriate firmware from the RFDesign website.
  2. On a Windows PC, download and install RFD Modem Tools.
  3. Use the RFD Modem Tools GUI to upload the firmware to your RFD900x or RFD900ux telemetry radio.

Build Instructions

You will need to install the required 8051 compiler, as this is not included in the default PX4 Build toolchain.

Mac OS

Install the toolchain:

brew install sdcc

Build the image for the standard SiK Radio / 3DR Radio:

git clone
cd SiK/Firmware
make install

Upload it to the radio (change the serial port name):

tools/ --port /dev/tty.usbserial-CHANGETHIS dst/radio~hm_trp.ihx

Configuration Instructions

The radio supports AT commands for configuration.

screen /dev/tty.usbserial-CHANGETHIS 57600 8N1

Then start command mode:



List the current settings:


Then set the net ID, write settings and reboot radio:


You might have to power-cycle the radio to connect it to the 2nd radio.

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