GEPRC ELRS 915M/2.4G C3 Gemini Xrossband Receiver

GEPRC's Gemini Xrossband receiver runs ExpressLRS on two Semtech LR1121 RF chips with an ESP32-C3 processor, covering both the sub-GHz (915 MHz) and 2.4 GHz bands on one board. It suits long-range and freestyle pilots who want the interference resistance of a dual-band Gemini link, and anyone who wants one receiver that works with either a 900 MHz or a 2.4 GHz ELRS transmitter.

Key features

• Three modes: 915 MHz Gemini, 2.4 GHz Gemini, or 915 MHz + 2.4 GHz dual-band; the dual-band mode needs a Gemini Xrossband (GemX) transmitter

• Fully compatible with standard single-band 915 MHz and 2.4 GHz ELRS transmitter modules

• Refresh rate from 25 Hz up to 1000 Hz (FSK); TCXO oscillator holds frequency across temperature changes

• Telemetry power up to 100 mW; firmware updates over WiFi through the built-in WiFi antenna

• Can be flashed with TX firmware to serve as a Gemini Xrossband transmitter module

Specifications

• MCU: ESP32-C3

• RF chips: 2 × Semtech LR1121

• Bands: 915 MHz (sub-GHz) and 2.4 GHz

• Refresh rate: 25–1000 Hz

• Telemetry power: up to 100 mW

• Operating voltage: 5V

• Antenna connectors: IPEX1 (U.FL)

• Receiver connector: SH1.0 4-pin

• Output protocols: CRSF, SBUS, SUMD, DJI RS2 Pro, MAVLink

• Dimensions: 18 × 23.6 × 5.7 mm

• Weight: 1.6 g (receiver only)

• Firmware target: GEPRC C3 900/2400 Gemini Xrossband RX

• In the box: receiver, dual-band T-antennas (IPEX1, 80 mm), SH1.0 4-pin silicone lead (100 mm), heat-shrink, manual

Wire it to a spare UART on the flight controller with a 5V supply. Set the sub-GHz regulatory domain (868 MHz EU or 915 MHz FCC) to match your transmitter, and keep receiver and TX on the same ELRS major version.