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.

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