Product overview
The GEPRC ELRS 915M/2.4G C3 Gemini Xrossband Receiver provides an ExpressLRS-based radio receiver component for UAV integration. Its architecture combines an ESP32-C3 processor with two LR1121 RF chips and a temperature-compensated crystal oscillator. The receiver measures 18×23.6×5.7mm and weighs 1.6g without accessories, defining the board space and receiver-only mass for installation planning. It operates at 5V, uses ipex1 antenna connections and provides CRSF, SBUS, SUMD, DJI RS2 Pro and MAVLink serial output options.
The supplied configuration contains one receiver, two 915M/2.4G dual-band T-antennas with ipex1 80mm specifications, a 100mm SH1.0 four-pin silicone cable, heat shrink tubing and a user manual. Switching among 915M Gemini, 2.4G Gemini and combined 915M+2.4G modes requires GemX TX; single-band ELRS transmitter modules are also supported. Refresh rates span 25Hz–1000Hz across LoRa and FSK, with the 1000Hz maximum specified for FSK. A built-in WiFi antenna supports firmware updates, while operation as a Gemini Xrossband transmitter requires flashing TX firmware.
Specifications
| Specification | Value & conditions |
|---|---|
| Model | GEPRC ELRS 915M/2.4G C3 Gemini Xrossband Receiver |
| Dimensions | 18×23.6×5.7mm |
| Weight | 1.6g (only receiver)Receiver only. |
| Chips | ESP32-C3, LR1121x2 |
| Crystal oscillator | TCXO |
| Frequency bands | 915MHz Gemini,2.4GHz Gemini,915M+2.4G Dual-BandGemX TX required for the listed switching modes. |
| Refresh rate | 25Hz-1000Hz(LoRa,FSK)LoRa and FSK; the 1000Hz maximum is specified for FSK. |
| Serial output protocols | CRSF, SBUS, SUMD, DJI RS2 Pro, MAVLink |
| Operating voltage | 5V |
| Antenna connector | Ipex1 |
| Telemetry power | 100mW |
| Firmware | GEPRC C3 900/2400 Gemini Xrossband RX |
| Receiver system | ExpressLRS-based dual-band receiver system. |
| RF band support | 150–960 MHz (sub-GHz) and 2.4 GHz; simultaneous dual-band transmission. |
| Selectable RF modes and transmitter requirement | Switching between 915M Gemini, 2.4G Gemini and 915M+2.4G Dual-Band modes requires GemX TX.Use of GemX TX. |
| Single-band transmitter compatibility | Compatible with single-band ELRS TX modules.Single-band ELRS TX modules. |
| Maximum refresh rate | Up to 1000 Hz (FSK).FSK. |
| Wireless firmware updates | Built-in WiFi antenna supports firmware upgrades via WiFi. |
| Transmitter conversion | Can function as a Gemini Xrossband TX module after flashing TX firmware.After flashing TX firmware. |
| Supplied receiver | 1 × GEPRC ELRS 915M/2.4G C3 Gemini Xrossband Receiver |
| Supplied antennas | 2 × 915M/2.4G dual-band T-antennas (ipex1 80mm)Included equipment. |
| Supplied receiver cable | 1 × receiver silicone cable (SH1.0 4pin 100mm)Included equipment. |
| Supplied insulation and documentation | 1 × heat shrink tube; 1 × user manualIncluded equipment. |
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