Radiomaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver

The XR4 receiver is a true dual-band diversity receiver equipped with two LR1121 RF transceivers and designed to use the advanced ExpressLRS Gemini Xrossband (Gem-X) protocol. It supports both 2.4GHz and Sub-Ge bands. The receiver has two independent RF circuits, allowing you to switch between single-band Gemini mode or dual-band Xrossband mode. Built-in Wi-Fi makes it easy to update firmware and configure via a user-friendly web interface.

Features:

True Diversity and Two-Way

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

High performance ESP32D4 microcontroller

Dual transceiver Semtech LR1121

Additional UART port for extended functionality

Lead pads for easy soldering

Specifications:

Microcontroller (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 reception refresh rate: DK500Hz/K1000Hz

Minimum reception refresh rate: 50Hz

Operating voltage: DC 4.5 – 8.4V

Weight: 1.7g (without antenna)

Dimensions: 22mm*18mm*4mm

Firmware version: ExpressLRS v3.5.1 (pre-installed)

Firmware target: RadioMaster XR4 2.4/900 Gemini RX

Bus interface 1: CRSF

Bus interface 2: UART

Equipment:

1 x XR4 Gemini Xrossband Dual-Band Receiver

2 x Dual-band T-antennas

1 x CRSF wire

3 x Heat cleaning tubes

1 x Instruction card