1 / 4Standard checkout available. Verified maker dispatch.
The RadioMaster XR4 is a true-diversity, dual-band receiver built around two Semtech LR1121 RF transceivers and an ESP32D4 processor. It is designed to take advantage of ExpressLRS Gemini Xrossband, where a radio talks on 2.4 GHz and 900 MHz at the same time for a more reliable link.
It is compatible with ExpressLRS 2.4 GHz, Sub-G 900 MHz, Gemini and Gemini Xrossband (Gem-X) modes, which means you can also use it with single-band ELRS transmitters on either frequency.
Working voltage is 4.5 to 8.4 V DC. The board measures 22 x 18 x 4 mm and weighs 1.7 g without antennas. A secondary UART port allows sensors or other equipment to connect, and castled pads give secure solder joints in tight builds.
Because a dual-band receiver benefits from antennas that see the world differently, place the two dual-band T-antennas in different directions and keep them clear of carbon fibre and power wires. Bind it using the usual ExpressLRS process and use your radio's ExpressLRS script to set the link mode.
Long-range pilots, industrial UAV operators and racers who fly a Gemini Xrossband radio and want the full benefit of the dual link. If you fly only a single-band ELRS radio and short distances, a simpler receiver is enough.
Keep your radio, module and receiver on matching ExpressLRS major versions, and use the ExpressLRS Configurator to flash the XR4 when a new release comes out. Gemini and Gem-X modes need a transmitter that also supports them, so confirm this before you rely on the dual link. The secondary UART can be used for sensors and other equipment, but plan its wiring before you finish the build.
2.4 GHz and Sub-G 900 MHz.
Two Semtech LR1121 transceivers.
DC 4.5 to 8.4 V.
1.7 g without antennas.
Yes, a secondary UART port for sensors and other equipment.
| Brand | Radiomaster |
|---|---|
| MCU / Processor | ESP32D4 |
| Operating Voltage | DC 4.5-8.4V |
| Weight | 1.700000 g |
| Selling unit | PCS |
