Radiomaster XR4 Gemini Xross ELRS 868MHz/2.4GHz

Radiomaster XR4 is a high-performance dual-band receiver with full diversity for the ExpressLRS (ELRS) system. ExpressLRS is an advanced open-source RC system with long range, low latency, high refresh rate, and many useful features. Learn more about ELRS here.

The receiver uses two fully functional transceiver chips and two antennas. It features Semtech LR1121 chips, enabling operation on 2.4GHz and 868/915MHz frequencies. Thanks to its dual-chip design, the receiver supports the Xrossband mode, allowing simultaneous reception on both frequency bands (one antenna for 2.4GHz and the other for 868MHz). With dual frequency bands and LoRa modulation, the connection is highly resistant to interference. The receiver can also operate in Gemini mode, where both transceiver chips work on the same frequency band but on two different frequencies, or in diversity mode, where both antennas receive the same signal. This makes the receiver compatible with all available ELRS transmitters. Frequencies and modes can be easily adjusted as needed.

The 2.4GHz band is ideal for racing and freestyle, offering a fast refresh rate with minimal latency, while the 868MHz band excels in its long-range performance. Xrossband mode provides the highest reliability. The receiver also features a second set of UART pads for potential future expansion. Additional features include telemetry power of up to 100mW and a power input range of 5-12.6V.

The package includes dual-band antennas, which support both 2.4GHz and Sub-G bands (868/915MHz).