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The 3DR Radio Telemetry Kit operates on the 433MHz band with 500mW of output power and is built around the HopeRF HM-TRP radio module. It gives your drone a two-way wireless data link to the ground so you can see and control what the aircraft is doing without a cable.
The firmware is open source, and the radios can be configured with AT commands, or remotely with RT commands, so you can tune a link that is already in the air. When the radios are used with APM, adaptive flow control helps the data link keep up with the telemetry stream.
The kit also supports OTG connections, so it works with Android cellphones and computers, and the listing notes that it can be used with a bi-directional amplifier if you need even more range.
500mW at 433MHz: a mid-power link suited to longer-range telemetry.
Open-source firmware: the radio firmware can be inspected, updated and configured.
AT commands: used to configure the radio settings.
RT commands: used to configure the remote radio over the link.
Adaptive flow control with APM: adjusts data flow when used with APM flight controllers.
HopeRF HM-TRP module: the proven radio module at the heart of the kit.
OTG support: connect to an Android phone or a computer.
A telemetry radio pair replaces the USB cable between your flight controller and your ground-station software. One radio is connected to the flight controller in the aircraft and the other to your laptop, tablet or phone. They exchange data in both directions, so the ground station can show position, battery and attitude, and can send commands or mission updates back to the aircraft.
Lower frequencies such as 433MHz travel further than higher frequencies at the same power, which is why this band is popular for long-range drone telemetry. Output power then sets how strong the signal is at range.
Live telemetry to a ground control station while flying
Sending waypoint missions and parameter changes to an APM-based drone
Long-range flights where a cable or short-range Bluetooth link is not enough
Tuning the radio link remotely with RT commands
Connecting to an Android phone or computer over OTG
The listing states that adaptive flow control is available when the kit is used with APM. The radios connect to the flight controller and to a computer or Android device that supports OTG.
Check the local rules on 433MHz transmitters and power limits before you fly, and mount the antennas away from carbon fibre and other interference.
Frequency: 433MHz
Output power: 500mW
Radio module: HopeRF HM-TRP
Firmware: open source
Configuration: AT commands and remote RT commands
Connectivity: OTG for Android cellphones and computers
1 x 3DR radio telemetry kit 433MHz 500mW long range
Drone builders and pilots who want an open-source 433MHz telemetry link for APM or a ground station, with the option to use an Android device.
433MHz.
500mW.
Yes. The listing states open-source firmware.
The listing says it supports OTG for Android cellphones and computers.
The listing says the kit can be used with a bi-directional amplifier for even more range.
It is based on the HopeRF HM-TRP radio module.
| Brand | Generic |
|---|---|
| Firmware | Open source |
| Frequency | 433MHz |
| Power | 500mW |
| Selling unit | PCS |
