RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver
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RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver
Product Details
The RadioMaster XR4 is a true-diversity dual-band ExpressLRS receiver built around twin Semtech LR1121 RF transceivers and an ESP32D4 MCU, supporting 2.4GHz, Sub-G 900MHz, Gemini, and Gemini Xrossband (Gem-X) operation. Its two independent RF circuits and dual T-type antennas allow switching between Gemini single-frequency and Xrossband dual-band modes, with antenna assignments of 2.4GHz/2.4GHz, 868/915MHz/868/915MHz, or 868/915MHz/2.4GHz depending on the selected mode.
Measuring 22 x 18 x 4 mm and weighing 1.7 g without antennas, the receiver delivers telemetry power of 100mW and a refresh rate range of 50Hz to DK500Hz/K1000Hz on a DC 4.5-8.4V supply. It ships with ExpressLRS v3.5.1 pre-installed, includes an integrated Wi-Fi module for firmware updates and configuration through WebUI, and provides CRSF and UART bus interfaces plus castled solder pads and a secondary UART port for advanced setups.
| Brand | RadioMaster |
| Model | XR4 |
| Product Type | Dual-Band ExpressLRS Receiver |
| MCU | ESP32D4 |
| RF Chip | LR1121 x 2 |
| RF Connector | IPEX-1 x 2 |
| Antenna | Dual-Band T Antenna x 2 (Included) |
| Frequency Range | 2.4GHz / Sub-G 900MHz |
| Telemetry Power | 100mW |
| Maximum Receive Refresh Rate | DK500Hz / K1000Hz |
| Minimum Receiver Refresh Rate | 50Hz |
| Working Voltage | DC 4.5 - 8.4V |
| Weight | 1.7g (without antenna) |
| Dimensions | 22mm x 18mm x 4mm |
| Firmware Version | ExpressLRS v3.5.1 pre-installed |
| FW Target | RadioMaster XR4 2.4/900 Gemini RX |
| Bus Interface 1 | CRSF |
| Bus Interface 2 | UART |
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Shipping Information
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FAQs
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