RadioMaster XR4 Gemini Dual-Band ExpressLRS Receiver – The Definitive High-Performance Control Link for FPV & UAV Systems
The RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS Receiver represents the current pinnacle of long-range, interference-resistant RC communication. Designed for mission-critical FPV drones, fixed-wing UAVs, and professional aerial platforms, the XR4 combines true dual-band diversity, Gemini simultaneous transmission, and ultra-low latency ExpressLRS firmware into one compact, rugged receiver.
This is not an incremental upgrade—it is a fundamental leap in how reliable RF links are engineered for modern FPV operations.
What Makes the XR4 Gemini Receiver a Category-Leader
The XR4 is built on three core pillars:
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True Dual-Band RF Architecture (2.4 GHz + Sub-GHz)
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Gemini Xrossband Simultaneous Packet Reception
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Native ExpressLRS Integration for Low Latency & Massive Range
Unlike standard single-band receivers that switch frequencies under stress, the XR4 listens on both bands at the same time, combining packets in real-time for unmatched control reliability.
Dual-Band Architecture Explained
Traditional receivers rely on:
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Single-band links
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Frequency hopping inside one RF spectrum
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Software-controlled antenna switching
The XR4 operates differently:
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2.4 GHz channel optimized for low latency
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Sub-GHz channel (900 MHz / 868 MHz) optimized for penetration and long range
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Hardware-level synchronization between both links
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Packet-level diversity combining
This architecture delivers:
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Superior urban penetration
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Stronger long-range stability
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Complete resistance to WiFi interference zones
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Minimal packet loss at extreme distances
Gemini Xrossband Technology – How It Works
Gemini is a parallel RF redundancy system. Instead of choosing one link over the other, the XR4 processes both simultaneously.
Key Benefits of Gemini Mode
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Zero-delay redundancy
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No dropout during band interference
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Smooth RSSI behavior even in RF-dense areas
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Flight stability maintained during signal occlusion
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Fail-safe protection against sudden band collapse
Native ExpressLRS Performance
The XR4 ships with official ExpressLRS firmware support, delivering:
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Update rates up to 1000 Hz
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Sub-2 ms end-to-end latency
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Dynamic RF power scaling
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LUA script configuration
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WiFi and USB firmware flashing
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EdgeTX and OpenTX compatibility
This enables real-time freestyle response and long-range cinematic precision from the same receiver.
Technical Specifications – XR4 Gemini Receiver
| Feature | Specification |
|---|---|
| RF Bands | 2.4 GHz + Sub-GHz (900 / 868 MHz) |
| Protocol | ExpressLRS |
| Diversity | True dual-radio Gemini |
| Telemetry | Full bidirectional |
| Update Rate | Up to 1000 Hz |
| Latency | Ultra-low latency |
| Antennas | Dual U.FL connectors |
| Weight | Ultra-light micro receiver |
| Voltage Input | Native 5V support |
| Firmware | WiFi + USB upgradeable |
| Failsafe | Hardware-level redundancy |
Real-World Performance Advantages
Long-Range FPV
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Stable control well beyond traditional 2.4 GHz limits
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Superior terrain penetration
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Clean signal recovery after deep fades
Cinematic & Commercial Drones
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Zero signal fluctuation during urban flights
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Stable link for waypoint missions
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Reduced telemetry dropouts during GPS navigation
Fixed-Wing & VTOL UAVs
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Uninterrupted control during long-endurance flights
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Ideal for mapping, surveillance, and endurance platforms
Weight
Dimensions
Associated Products
- XR1 Nano Multi-Frequency ExpressLRS Receiver
- XR2 Nano 2.4GHz ExpressLRS Receiver
- XR3 Nano Multi-Frequency ExpressLRS Receiver
- 2.4GHz / Sub-G 900MHz Dual-Band T Antenna
- UFL 2.4Ghz T Antenna 65mm/95mm for ELRS Receivers
- UFL 915/868MHz T & Y Antenna for BR Series Receivers
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Package Includes
- 1 * XR4 Gemini Xrossband Dual-Band Receiver
- 2 * Dual-Band T-Antenna
- 1 * CRSF Wire
- 3 * Heat-Shrinkable Tube
- 1 * Manual Card
XR4 Receiver is installed with ExpressLRS as standard.
ExpressLRS is an open-source, high-performance radio control link that delivers exceptional range and low-latency communication using advanced LoRa technology. It’s highly customizable and perfect for RC enthusiasts looking for reliability and efficiency.
Pair your ExpressLRS with Radiomaster’s top-tier transmitters and receivers. Radiomaster products are designed to maximize the benefits of ExpressLRS, offering state-of-the-art performance for your RC adventures. Upgrade your RC experience with the unbeatable combination of ExpressLRS and Radiomaster—engineered for excellence and tailored for you.
CHECK OUT OUR VTX COLLECTION:
What is a Video Transmitter?
https://www.easytechjunkie.com/what-is-a-video-transmitter.htm
VTX stands for video transmitter, this is the heart of the FPV life system. Pumping life into the many possibilities of FPV. VTXs come in many different shapes, sizes, strengths, and wiring setups. Strapped to the front of the quad is an FPV camera, and strapped to the head is a pair of FPV goggles. You can watch live, instantaneous footage right from the cockpit because the VTX is sending the footage received from the camera out to the goggles.
You are picking the right VTX for you. This will start with knowing if size and weight are factors for you. If you are planning to race, and only race, then you will select any VTX that is light in weight. It’s probably important that your VTX can do pit mode and channel control (depending on which one you choose). This may be a smart audio feature or the tramp protocol. Pit mode is where you will be able to set your VTX to a certain mode that allows you to power up your quad without powering up your VTX to keep you from blasting video and trampling over other racers on the track. Channel control allows you to change your frequency right from your radio for easy switching at a race, or to prepare your quads for the race the next day. Seeing that range is not so much of a factor in a race, only 25mw is allowed, and all that you need. So you can pretty much pick any when it comes to figuring out which is best for you and your power output needs.
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