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 or interference prone environments. Its compact, lightweight design ensures reliable connectivity in critical situations where every signal matters. The XR4 offers the most secure and robust RF link available, providing unbeatable reliability even under the toughest 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

Specifications

Item: XR4 Gemini Xrossband Dual-Band Receiver

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