SiK telemetry radios transfer data between the Pixhawk and the ground station. QGroundControl continuously reads data coming in from the Pixhawk to update the map, display battery voltage, GPS location, speed, heading, errors and warnings, and so on. Telemetry radios also send commands from QGroundControl to the Pixhawk (i.e., change parameters, upload auto mission, etc.).
Radio Frequencies
SiK telemetry radios come in sets of two – one is plugged into one of the ‘TELEM’ ports on the Pixhawk and the other connects via USB to the laptop, mobile phone, or tablet. These radios operate on either 915 MHz or 433 MHz and please consult radio frequency rules and regulations in your area before purchasing radios.
Range
SiK telemetry radios must have an unobstructed line of sight to transfer data. Drone pilots have it a bit easier, as the altitude of the drone can increase the distance over which the radios can communicate. This distance is somewhat reduced for a small autonomous boat at sea level. If possible, position your ground station as high as possible, or purchase a USB extension cable. Don’t expect more than 100-200 m. Your Maker Boat Basic will continue to function even if the connection between the radios is lost.
Clone Wars
All Pixhawk hardware is open source, including the Sik telemetry radios. Many resellers have copied the telemetry radios and, as a result, numerous clones can be found on Amazon. Quality and performance varies widely. Check product reviews, ask on forums or Facebook before purchasing. You can also Contact Us with questions.
SiK Telemetry Radio Specifications
For detailed information (pinouts, etc.), check out the Ardupilot documentation.