3DR Radio Telemetry Kit 433MHz 500mW

The 3DR Radio Telemetry Kit has a 433Mhz frequency band and Receiver sensitivity to -124 dBm. This 3dr telemetry kit allows you to link to a flight controller to a USB or UART-equipped device such as a computer, laptop or tablet supporting a USB connection (OTG).

The Radio set lets you see live data, such as live GPS position overlaid on a map, system voltage, heading, waypoint navigation and much more. The system utilizes the 433MHz band and provides a full-duplex link using HopeRF’s HM-TRP modules running custom, open-source, firmware.

Using open-source MAVlink based ground station software, you can even fly your aircraft with a joystick via your computer and update settings live! Or just use it for your DIY projects that need a wireless Serial interface. This kit offers a great low price, longer range, and superior performance. The system utilizes the 433MHz band and provides a full-duplex link using HopeRF’s HM-TRP modules running custom, open-source, firmware.

Features :

• MAVLink protocol framing status documents
• Frequency modulation and Spread Spectrum (FHSS)
• Self-adaption to time-division multiplexing
• Support LBT and AFA
• Configurable duty cycle
• Built-in error-correcting code(up to 25% data bit error)
• AT command configure data transmission
• RT command remote control data transmission
• Interchangeable air and ground 433MHz modules
• Micro-USB port
• 6-position Molex connector
• 500 mW maximum output power (adjustable)
• SMA connector
• 2-way full-duplex communication through adaptive TDM
• UART interface
• Transparent serial link
• Open-source SIK firmware
• Configurable through *Mission Planner and *APM Planner
• Based on the HM-TRP wireless module, with Si1000 8051 microcontroller and Si4432 wireless module

Setup Guide: 3DR Radio Telemetry Kit with Pixhawk / ArduPilot

• Step 1 – Identify Modules: Separate the kit into the Air module (mounted on the drone) and the Ground module (connected to your PC).
• Step 2 – Connect to Pixhawk: Plug the Air module into the Pixhawk’s TELEM1 or TELEM2 port. Connect TX to RX, RX to TX, 5V to 5V, and GND to GND.
• Step 3 – Connect Ground Module: Plug the Ground module into your PC using the provided USB cable. It will appear as a COM port once detected.
• Step 4 – Install Drivers: Install USB-to-serial drivers if your PC doesn’t recognize the device automatically.
• Step 5 – Open Mission Planner or QGroundControl: Launch your preferred ground control software and select the correct COM port and baud rate (usually 57600).
• Step 6 – Verify Radio Link: Power both modules. The green LED on both units should light up when they are successfully connected.
• Step 7 – Match Settings: Make sure both radios have matching Net ID, air speed, and frequency band for proper communication.
• Step 8 – Configure Pixhawk: In your flight controller parameters, set the serial port protocol to MAVLink and confirm baud rate matches the radio’s configuration.
• Step 9 – Test Telemetry: With both modules powered, confirm that live data such as GPS, altitude, and battery voltage appears on the ground control station.
• Step 10 – Mount Securely: Fix the Air module and antenna away from power lines or motors to avoid interference and ensure a stable link during flight.

Applications

• Used for wireless telemetry communication between drone and ground control station.
• Ideal for real-time flight data monitoring and mission planning.
• Supports long-range communication for UAVs, rovers, and boats.
• Enables parameter tuning and firmware updates without a wired connection.
• Useful in autonomous drone operations and waypoint navigation missions.
• Can be integrated into DIY robotics and research projects requiring remote control.
• Enhances safety by allowing pilots to track vehicle status and GPS location live.
• Suitable for aerial mapping, surveying, and agriculture drone applications.

Troubleshooting: Fixing Connection Drops

• Check Antenna Connection: Ensure both antennas are firmly attached and oriented vertically for optimal signal strength.
• Verify Power Supply: Make sure both modules receive stable 5V power; low voltage can cause intermittent disconnections.
• Inspect Cable Connections: Double-check TX/RX and GND wiring between the Air module and Pixhawk for loose or reversed connections.
• Reduce Interference: Keep the telemetry modules away from high-current wires, ESCs, or Wi-Fi routers that may cause signal noise.
• Match Firmware Versions: Both radio modules should run the same firmware version to prevent data mismatch or signal dropouts.
• Recheck Frequency & Net ID: Ensure both radios are set to the same frequency, network ID, and air data rate in the configuration tool.
• Monitor Signal Quality: In Mission Planner or QGroundControl, check RSSI values; if low, reposition antennas or reduce distance.
• Update Configuration: Reset both radios to default settings and re-pair if the link continues to drop intermittently.
• Use Shorter Cables: Avoid long or unshielded cables that can introduce noise or voltage drops affecting communication.
• Test with Another Port: Try using TELEM2 or a different USB port on your PC to isolate hardware-related connection issues.