XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver

Overview

The RadioMaster XR4 Gemini Xrossband is a true diversity, dual-band ExpressLRS receiver designed for 2.4GHz and Sub-G 900MHz operation, including Gemini and Gemini Xrossband (Gem-X) modes. It uses dual Semtech LR1121 transceivers and includes two dual-band T-style antennas for Xrossband compatibility.

Gemini-X assigns each RF connector to a specific band (ANT2/2.4G and ANT1/Sub-G), enabling use of tuned antennas for each band. The XR4 also provides an additional UART for future expansion and supports Wi-Fi-based firmware/configuration via WebUI.

Key Features

• True diversity & dual-band design
• ExpressLRS Gemini Xrossband (Gem-X) support
• Compatible with ExpressLRS 2.4GHz, Sub-G 900MHz, Gemini & Gemini Xrossband (Gem-X)
• ESP32D4 high-performance MCU
• 2 x Semtech LR1121 transceivers
• Secondary UART port for advanced functionality / future expansion
• Castellated pads for easier soldering
• Dual-band T-style antennas included
• Shown as compatible with existing RadioMaster ExpressLRS radios and modules

Gemini / Xrossband Antenna Mapping

• Gemini 2.4GHz: Ant 1 = 2.4GHz; Ant 2 = 2.4GHz
• Gemini SubG: Ant 1 = 868/915MHz; Ant 2 = 868/915MHz
• Gemini Xrossband (Gem-X): Ant 1 = 868/915MHz; Ant 2 = 2.4GHz

Specifications

What’s Included

• 1 x XR4 Gemini Xrossband Dual-Band Receiver
• 2 x Dual-Band T-Antenna
• 1 x CRSF Wire
• 3 x Heat-Shrinkable Tube
• 1 x Manual Card

For product questions, wiring help, or after-sales support, contact support@rcdrone.top or visit https://rcdrone.top/.

Details