Radiomaster XR4 Gemini Xrossband receiver with dual-band capability for stable links
XR4 dual-band antenna pair improving signal stability and reception
XR4 enables easy updates via Wi-Fi WebUI for configuration
XR4 front view showing LR1121 transceiver for low latency performance
XR4 back view highlighting dual LR1121 transceivers and ports
XR4 castled pads designed for straightforward soldering and quick builds
XR4 CRSF and UART interfaces for flexible telemetry and control
XR4 compact module with small form factor and light weight
XR4 ships with preinstalled ExpressLRS v3.5.1 firmware for quick setup

RADIOMASTER

Radiomaster XR4 Gemini Xrossband Dual-Band Receiver | True Diversity & Low-Latency

High-performance toys made for confident daily results

$56.41

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Why customers choose ToyTerrax Toys and Games

Overview

The Radiomaster XR4 Gemini Xrossband Dual-Band Receiver is a compact, true diversity module designed to maximize reliability across 2.4 GHz and Sub-G 900 MHz bands. Built around dual LR1121 transceivers, it supports the advanced ExpressLRS Gemini Xrossband protocol (Gem-X), delivering flexible operation and robust connectivity for demanding flying environments.

What makes it stand out

  • Dual independent RF circuits provide improved reception, reducing dropouts in challenging airspace.
  • Versatile operation modes let you switch between Gemini single-frequency or Xrossband dual-band to match the mission.
  • Integrated Wi-Fi module enables firmware updates and configuration via a WebUI from PC or mobile devices.
  • Ultra-low latency and high refresh rates help maintain a responsive control link in real time.

Real world use cases

  • Ideal for lightweight drones and fixed-wing platforms needing a reliable RF link.
  • Beneficial in environments with interference or longer-range flying where signal stability matters.
  • Quick on-the-field tuning and updates thanks to the WebUI and easy-to-solder design.

Performance and specs at a glance

  • Supports 2.4 GHz and Sub-G 900 MHz bands with dual LR1121 transceivers.
  • Telemetry power up to 100 mW and high refresh rate options for responsive control.
  • Compact dimensions (22 mm x 18 mm x 4 mm) and light weight (about 1.7 g, antenna excluded).
  • Pre-installed ExpressLRS v3.5.1 firmware; CRSF and UART interfaces for telemetry and control.
  • Includes two dual-band T antennas, CRSF wire, heat shrink tubing, and a manual card.

The XR4 is designed to be easy to mount and ready for tuning, offering a robust RF link when every signal matters. The combination of flexible band support, fast updates via WebUI, and compact form factor makes it a practical choice for pilots seeking reliable performance without compromising on weight or complexity.

FAQ

Q: What bands does the XR4 support and how does true diversity improve reliability?

A: It supports 2.4 GHz and Sub-G 900 MHz, with dual LR1121 transceivers for a more stable link.

Q: Is setup quick, and can I update firmware easily?

A: Yes. ExpressLRS v3.5.1 is pre-installed and a WebUI via Wi-Fi makes updates straightforward.

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