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RFRX-Gemini ELRS Dual-Band RC Receiver | 900MHz/2.4GHz Gemini Diversity | LR1121+ESP32 Chipset | 2×100mW Telemetry | Long Range & Racing FPV Drone Receiver
RFRX-Gemini is an ELRS dual-band RC receiver with an LR1121+ESP32 chipset, featuring 900MHz/2.4GHz diversity reception and dual 100mW telemetry power. With 3.6-4.2V wide voltage input, it combines long-range penetration with high-refresh low latency, suitable for all flight scenarios including racing, long-range and freestyle.
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Product Overview
The RFRX-Gemini is a high-performance dual-band RC receiver built on the ExpressLRS open-source protocol, featuring a “Gemini” dual-band diversity architecture that solves the traditional trade-off between long range and low latency. It adopts an LR1121 integrated RF chip paired with an ESP32-PICO-D4 high-performance main controller, supporting simultaneous operation on 900MHz and 2.4GHz bands with 100mW transmit power per band. It combines the ultra-long range and strong penetration of the 900MHz band with the high refresh rate and low latency of the 2.4GHz band.
Supporting a wide 3.6V-4.2V input voltage range, it can be powered directly by a single-cell lithium battery and is compatible with mainstream ELRS dual-band TX modules and remote controllers. Its compact all-in-one design ensures easy installation. A single device covers all scenarios including FPV racing, freestyle flight, long-range crossing and fixed-wing long-distance flight, making it an ideal choice for pilots seeking versatile, highly stable RC links.
Core Technical Specifications
| Specification | Details |
|---|---|
| Model | RFRX-Gemini |
| Operating Frequency | 900MHz ISM Band / 2.4GHz ISM Band (Dual-Band) |
| Chipset Solution | LR1121 RF Chip + ESP32-PICO-D4 Main Controller Chip |
| Telemetry Transmit Power | 2×100mW (100mW per frequency band) |
| Input Voltage | 3.6V – 4.2V DC |
| Supported Protocol | ExpressLRS Open-Source RC Protocol |
| Product Type | Dual-Band Diversity Two-Way Telemetry RC Receiver |
Core Features & Benefits
1. Gemini Dual-Band Diversity for Range & Latency in One Device
It adopts a diversity reception design with simultaneous 900MHz and 2.4GHz operation, automatically selecting the optimal signal link. The 900MHz band delivers strong diffraction and low penetration loss for long-range transmission and stable performance in obstructed environments, while the 2.4GHz band offers higher bandwidth and lower latency for high-refresh-rate precision control. The dual-band complementary design greatly improves link stability in complex electromagnetic and multi-obstacle environments, eliminating the need to swap receivers for different flight scenarios.
2. Next-Gen RF & Main Controller for Strong Performance & Anti-Interference
The highly integrated LR1121 RF chip offers higher integration, better power efficiency and stronger weak-signal demodulation than traditional discrete RF solutions. Paired with the high-performance ESP32-PICO-D4 main controller, it provides sufficient computing power to run the latest ELRS firmware smoothly, supporting higher signal refresh rates and richer feature settings. The dual-core 协同 architecture maintains a solid RC link even in multi-pilot racing environments and sites with complex electromagnetic interference, greatly reducing packet loss and signal loss risks.
3. Dual 100mW Return Links for Stable Two-Way Telemetry
Each frequency band is equipped with a 100mW return link, enabling stable two-way transmission of flight status data. Core telemetry information such as battery voltage, flight distance, signal quality and receiver status can be transmitted back to the remote controller in real time. Even in long-range flight scenarios, telemetry data remains stable, allowing pilots to monitor the aircraft’s working status at all times and improve flight safety.
4. Wide Voltage Input for Lightweight & Easy Installation
It supports a wide DC input range of 3.6V-4.2V, powered directly by a 1S LiPo battery to perfectly fit the common power systems of mainstream FPV drones, fixed-wing aircraft and gliders. No extra voltage regulator module is required, simplifying wiring and reducing extra payload, making it ideal for compact airframes with limited installation space.
5. Open-Source ELRS Protocol for Wide Compatibility & Flexibility
Developed based on the standard ExpressLRS open-source protocol, it is fully compatible with mainstream ELRS dual-band TX modules and remote controllers on the market. It supports online firmware updates and custom parameter tuning, allowing pilots to flexibly adjust refresh rate, transmit power and packet rate according to flight scenarios, with high gameplay flexibility to suit different pilot habits and needs.
6. Compact All-In-One Design for Wide Airframe Compatibility
The all-in-one compact body is lightweight and takes up minimal installation space, easily fitting all types of RC models including FPV drones, long-range fixed-wing aircraft, gliders and tiny whoops. With standard connection terminals and universal mounting positions, assembly and binding are simple and convenient, even for beginners to complete quickly.
Applicable Scenarios
- Long-range FPV drone flight, medium/long-distance freestyle flight
- FPV racing competitions, multi-pilot group flight events
- Ultra-long-distance control of fixed-wing aircraft and gliders
- Flight in complex outdoor environments with buildings and tree obstructions
- Pilots seeking a single receiver for multiple flight scenarios
Package Contents
- 1 × RFRX-Gemini ELRS Dual-Band Receiver Main Unit
- 1 × Dedicated Connection Cable
- 1 × Product User Manual
| SKU | IUAV-14121 |
|---|
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