Radiomaster XR4 Gemini Crossband Dual-Band ELRS Receiver

The XR4 receiver is a state-of-the-art true diversity dual-band receiver with two LR1121 RF transceivers, utilizing the advanced ExpressLRS Gemini Crossband (Gem-X) protocol. It seamlessly supports both the 2.4 GHz and Sub-G 900 MHz bands, and its two T-antennas provide excellent receive sensitivity and link stability for optimal performance.

The XR4 is equipped with two independent RF circuits and offers versatile operating modes, allowing you to switch between Gemini single-frequency or Xrossband dual-band mode. The integrated Wi-Fi module simplifies firmware updates and configuration via a user-friendly web interface on your PC or mobile device.

With extremely low latency and a high frame rate, the XR4 delivers a stable, rock-solid RF connection, even over demanding long distances or in challenging environments. Its compact, lightweight design is perfect for drones and fixed-wing models, providing reliable connectivity in critical situations where every signal counts. The XR4 ensures you have access to the most secure and robust RF connection on the market, offering unbeatable reliability under the most demanding conditions.

Features

• True diversity and dual-band
• Unrivaled reliability with ExpressLRS Gemini Crossband
• Compatible with ExpressLRS 2.4 GHz, Sub-G 900 MHz, Gemini and Gemini Crossband (Gem-X)
• ESP32D4 High-Performance MCU
• Dual Semtech LR1121 transceiver
• Secondary UART connector for extended functionality
• Castled pads for easy soldering

specification

• Item: XR4 Gemini Crossband Dual-Band Receiver
• MCU: ESP32D4
• RF chip: LR1121 x 2
• RF connector: IPEX-1 x 2
• Antenna: Dual-band T-antenna x 2 (included in the package)
• Frequency range: 2.4 GHz / Sub-G 900 MHz
• Telemetry power: 100 mW
• Maximum receive update rate: DK500Hz / K1000Hz
• Minimum receiver update rate: 50Hz
• Operating voltage: DC 5.0 - 12.6 V
• Weight: 1.7 g (without antenna)
• Dimensions: 22 mm * 18 mm * 4 mm
• 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