RadioMaster XR4 Gemini Xrossband Dual-Band ELRS Receiver

The RadioMaster XR4 Gemini Xrossband is a dual-band ELRS receiver designed for pilots who want maximum link resilience on long-range builds or RF-noisy flying sites. Twin Semtech LR1121 transceivers let it listen on both 2.4GHz and 868/915MHz at the same time, adding redundancy beyond a single-band receiver.

Key features

• Gemini Xrossband dual-band reception with true diversity for stable links when one band or antenna orientation is compromised.
• ESP32-D4 MCU with built-in Wi-Fi for WebUI configuration and firmware updates without a computer cable.
• Refresh rate up to 1000Hz for low-latency control response.
• Dual CRSF and UART bus interfaces give flexible wiring options to the flight controller.
• Ultra-light 1.7g in a compact 22 x 18 x 4mm package, with castellated pads for easy soldering.

The package includes two dual-band T-antennas, a CRSF wire, heat-shrink tubing and a manual card, so it is ready to bind into most ELRS-based radio setups out of the box.

Specifications

• Protocol: ExpressLRS (Gemini Xrossband)
• Frequency: 2.4GHz and 868/915MHz
• MCU / RF chip: ESP32-D4, 2x LR1121
• Telemetry power: 100 mW
• Working voltage: 4.5-8.4 V
• Antenna connector: 2x IPEX-1 (U.FL)
• Weight: 1.7g
• Dimensions: 22 x 18 x 4mm