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RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver

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Introducing the XR4 XrossBand Receiver – The Pinnacle of compact Dual-Band Performance

The XR4 Receiver is a cutting-edge true diversity dual-band receiver featuring dual LR1121 RF transceivers,

designed to leverage the advanced ExpressLRS Gemini Xrossband protocol (Gem-X). It seamlessly supports both the

2.4GHz and Sub-G 900MHz bands, and its dual T-type antennas provide superior reception sensitivity and connection stability for optimal performance.

Built with two independent RF circuits, the XR4 offers versatile operation modes, allowing you to switch between Gemini single-frequency

or Xrossband dual-band modes, and can be tailored to your specific needs. The integrated Wi-Fi module simplifies firmware updates

and configuration via a user-friendly WebUI on your PC or mobile device.

With ultra-low latency and a high refresh rate, the XR4 excels in delivering a stable, rock-solid RF link, even in demanding long-range or challenging

environments. Its compact, lightweight design is perfect for drones, and fixed-wing models, offering reliable connectivity in critical situations

where every signal matters. The XR4 ensures you maintain the most secure and robust RF link available,

providing unbeatable reliability in the most demanding conditions.

Features

True Diversity & Dual-Band

Unmatched reliability with ExpressLRS Gemini Xrossband

Compatible with ExpressLRS 2.4GHz, Sub-G 900MHz, Gemini & Gemini Xrossband (Gem-X)

ESP32D4 high-performance MCU

Twin Semtech LR1121 Transceiver

Secondary UART port for advanced functionality

Castled pads for easy soldering

Specification

Item: XR4 Gemini Xrossband Dual-Band 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)

Dimension: 22mm * 18mm * 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



Package Includes

1 * XR4 Gemini Xrossband Dual-Band Receiver

2 * Dual-Band T-Antenna

1 * CRSF Wire

3 * Heat-Shrinkable Tube

1 * Manual Card