RadioMaster XR4 Gemini Xcrossband Dual-Band ExpressLRS Receiver

XR4 is an advanced, dual-band receiver with two LR1121 RF transceivers designed to operate with the modern ExpressLRS Gemini Xrossband (Gem-X) protocol. It seamlessly supports both 2.4 GHz and Sub-G 900 MHz frequency bands, and two T-shaped antennas ensure the highest level of signal sensitivity and connection stability for optimal performance. Integrated two independent RF circuits allow XR4 to operate flexibly: you can choose single-frequency (Gemini) or dual-frequency (Xrossband) operating modes, adapting the device to individual needs. The installed Wi-Fi module allows you to easily update the software and configure the receiver via a convenient WebUI interface on a computer or mobile device. XR4 features extremely low latency and high refresh rate, ensuring stable and reliable RF communication even in difficult conditions or over long distances. Thanks to its compact design, this receiver is ideal for drones or fixed-wing models. XR4 is the safest and most reliable RF communication solution even in the most challenging conditions.

Features:

• True dual-channel reception – for greater signal reliability;
• Unparalleled connection stability with ExpressLRS Gemini Xrossband technology;
• Compatible with ExpressLRS 2.4 GHz, Sub-G 900 MHz, Gemini and Gemini Xrossband (Gem-X) modes;
• ESP32D4 – high-performance microcontroller;
• Two Semtech LR1121 transceivers;
• Additional UART port for advanced functions;
• Castled type contacts – for convenient soldering.

Specification:

• Item: XR4 Gemini Xrossband dual-frequency receiver;
• Controller (MCU): ESP32D4;
• RF chip: LR1121 × 2;
• RF connector: IPEX-1 × 2;
• Antennas: Dual-frequency T-shaped antennas × 2 (included);
• Frequency range: 2.4 GHz / Sub-G 900 MHz;
• Telemetry transmission power: 100 mW;
• Maximum reception refresh rate: DK500 Hz / K1000 Hz;
• Minimum receiver refresh rate: 50 Hz;
• Operating voltage: DC 4.5 – 8.4 V;
• Weight: 1.7 g (without antennas);
• Dimensions: 22 mm × 18 mm × 4 mm;
• Software version: ExpressLRS v3.5.1 (pre-installed);
• Software (FW Target): RadioMaster XR4 2.4/900 Gemini RX;
• Interface 1: CRSF;
• Interface 2: UART.

Package:

1× XR4 Gemini Xrossband dual-frequency receiver;
2× Dual-frequency T-shaped antennas;
1× CRSF connection cable;
3× Thermo tubes;
1× Instruction card.