Gemini Xrossband (GemX) 2.4GHz+915MHz 1W ELRS TX Module

Gemini Xrossband (GemX) 2.4GHz+915MHz 1W ELRS TX Module
Details:
Gemini Xrossband (abbreviated as GemX) represents the pinnacle breakthrough in ExpressLRS technology regarding reliability. Equipped with two Semtech LR1121 third-generation RF transceiver chips, this module can transmit signals simultaneously on both the 2.4GHz and 915MHz frequency bands. Unlike traditional single-band systems, GemX does not simply force you to "choose one" between the two. Instead, it seamlessly merges the ultra-low latency of 2.4GHz with the long-range penetration of 900MHz into a single, redundant control link. Whether facing dense RF interference, complex urban obstacles, or extreme long-range distances, GemX delivers the most reliable RF link currently available in the ELRS ecosystem.
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Xpert Intelligent Equipment Co., Ltd. is one of the leading manufacturers and suppliers of gemini xrossband (gemx) 2.4ghz+915mhz 1w elrs tx module in China. We have world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale bulk cheap gemini xrossband (gemx) 2.4ghz+915mhz 1w elrs tx module in stock here from our factory. Customized orders are welcome.

 

Simultaneous Dual-Band Transmission: No More Trade-Offs

This is GemX's core technological breakthrough. Traditional dual-band modules only allow switching between 2.4GHz and 900MHz – GemX keeps both chips working simultaneously – one antenna on 2.4GHz while the other operates on 900MHz at the same time. Both bands transmit identical packets simultaneously. If the 2.4GHz band gets hit with interference, the 900MHz band seamlessly takes over; if 900MHz signals are blocked, the 2.4GHz link remains available. This "dual-path parallel" design dramatically increases the probability of the receiver successfully capturing packets, resulting in a much more stable Link Quality .

Gemini Xrossband GemX 24GHz915MHz 1W ELRS TX Module

Powerful Telemetry Link

GemX's advantages extend beyond downlink control signals to uplink telemetry data return. A Gemini TX not only simultaneously transmits dual-band packets but also simultaneously receives telemetry packets from the receiver. This means critical feedback data such as voltage, GPS coordinates, and RSSI become more stable with fewer missed packets. This is especially crucial for MAVLink users relying on ground station control – a single missed packet can invalidate an entire MAVLink data frame.
Gemini Xrossband GemX 24GHz915MHz 1W ELRS TX Module

Full Technical Specifications

Parameter Specification
Operating Voltage 5-8.4V 
Frequency Range 915M/2.4G
Output Power 30dBm 
Operating Current 1.4A /8.4V
Refresh Rate 25Hz / 50Hz / 100Hz / 200Hz
Main Control Chip ESP32 + LR1121
Antenna Connector SMA‑Jack
Color Black
Dimensions 55 * 86 * 41mm
Weight 78g
Gemini Xrossband GemX 24GHz915MHz 1W ELRS TX Module
 

Applications & Competitive Advantages

 

Drone search and rescue application scenarios
 

Engineered with simultaneous dual-band transmission and seamless redundant switching at its core, the Gemini Xrossband Transmitter Module is purpose-built for mission-critical applications where control link reliability and interference immunity are paramount. It is ideally deployed in critical infrastructure security patrols – enabling beyond-visual-line-of-sight remote monitoring of power lines, ports, and border perimeters; emergency rescue operations – where uninterrupted control links are essential for mountain search and rescue, disaster damage assessment, and rapid response missions; and professional cinematography – meeting the dual demands of precision camera control and uncompromised signal continuity required in commercial film and broadcast productions. For pilots and commercial operators who cannot afford a single packet loss, GemX delivers the most robust and trustworthy control link in the ELRS ecosystem.

Customer Reviews

  • Australia・Oliver
  • Canada・Noah
  • Turkey・Mehmet
  • Egypt・Mohamed
  • Middle‑East・Mohammad
  • 6
    Australia・Oliver

    We purchased 1900 units of this GemX cross-band ELRS TX Module in bulk for urban high-rise fire rescue drones. In the dense building environment of the urban core area, it uses the 2.4GHz band for conventional low-altitude flight to ensure low-latency control. When the drone flies to the back of a building above 30 floors, it automatically switches to the 915MHz band, greatly enhancing signal diffraction capability, and no control out-of-control problem caused by signal disconnection ever occurred.

  • 7
    Canada・Noah

    We equipped our mountain geological disaster monitoring drone cluster with 200 units of this GemX cross-band ELRS TX Module. During conventional flight in open mountain areas, it uses the 2.4GHz band to ensure low-latency control. When the drone flies into the canyon monitoring area obstructed by mountains, it automatically switches to the 915MHz band, greatly enhancing the signal's ability to penetrate mountain obstructions. It maintains a stable control link even in plateau mountain areas above 4200m altitude, completely avoiding the pain point of insufficient signal diffraction capability of ordinary single-band ELRS modules in mountain scenarios.

  • 8
    Turkey・Mehmet

    We purchased 185 units of this GemX cross-band ELRS TX Module in bulk for large construction site inspection drones. Leveraging FHSS frequency hopping technology and intelligent dual-band switching function, in complex electromagnetic environments with dense deployment of a large number of construction machinery and WiFi devices, it uses the 2.4GHz band for conventional inspection to ensure low latency, and automatically switches to the 915MHz band to avoid interference when encountering strong interference, completely avoiding the control out-of-control problem caused by signal interference.

  • 9
    Egypt・Mohamed

    We equipped our industrial park security inspection drone cluster with 175 units of this GemX cross-band ELRS TX Module. During conventional inspection on open main roads in the park, it uses the 2.4GHz band to ensure low-latency control. When the drone flies into areas obstructed by dense factory buildings and storage shelves, it automatically switches to the 915MHz band, greatly enhancing the signal's ability to penetrate obstructions. It maintains a stable control link even in complex electromagnetic environments with dense deployment of a large number of industrial WiFi and IoT devices, completely avoiding the pain point that ordinary single-band ELRS modules are easily interfered with by signals in industrial scenarios.

  • 10
    Middle‑East・Mohammad

    We purchased 210 units of this GemX 2.4GHz+915MHz 1W ELRS TX Module in bulk for professional long-range FPV racing competition aircraft. Leveraging the dual-band design of the Semtech LR1121 single chip, it uses the 2.4GHz band on open racing tracks to ensure 1000Hz high refresh rate and low-latency control. When the drone flies into forest-obstructed areas beside the track, it automatically switches to the 915MHz band, with signal diffraction and penetration capability 45% higher than ordinary single-band ELRS modules. The maximum stable control distance exceeds 45km, fully meeting the full-scenario coverage requirements of long-distance racing events. No out-of-control crash accidents were reported in 10 months of deployment.

Company Profile

 

In 2015, Xpert planted a seed in Shenzhen. Eleven years later, that seed has grown into a manufacturing network of 6 production bases, 2 research centres, and 3 end‑to‑end testing facilities.We chose not to take shortcuts. Instead, we built an integrated system where every stage - from incoming QC to final pre‑shipment validation - is kept in‑house and aligned with global premium standards.Along the way, we have delivered to Europe, the Americas, the Middle East, and Asia, and earned a place on the vendor lists of the most quality‑conscious buyers in each region. Their repeat orders come down to one simple fact: we say what we do, and we do what we say. Trust, for us, is measured in containers shipped, inspections passed, and zero defects delivered - consistently, order after order.

 

Manufacturer of carbon fiber drone frames FPV drones and brushless drone motors

 

Factory Strength

High-precision CNC workshop processing FPV drone frame
FPV brushless drone motor horizontal vertical mount motor manufacturing
Automated CNC production line for carbon fiber drone frame
CNC machining equipment for FPV carbon fiber drone frame processing

When you partner with Xpert, you access six specialised drone factories spanning 24,000 ㎡ and equipped with over 330 high‑end precision tools - but more importantly, you tap into a manufacturing system built for flexibility.

We own the entire production workflow: carbon fibre parts, core motors, assembly, and final debugging are all managed internally. That means we can adapt to your specifications quickly, without waiting on third‑party suppliers.

Strict quality controls are applied at every step, ensuring that even high‑volume production runs maintain the same exacting standards. Whether you need a minor tweak or a complete custom design, Xpert delivers on time, every time.

FAQ

 

Will the automatic dual-band switching function add extra latency?

Leveraging the dual-RF design of the Semtech LR1121 single chip, the band switching response time is less than 1ms, no perceptible extra latency will be introduced, fully meeting the low-latency control requirements of high-speed model aircraft and industrial drones.

Does this module support OTA online firmware upgrade?

It supports OTA upgrade through the official ELRS supporting tool, and new functions such as custom frequency hopping sequence and cross-band automatic switching rules can be unlocked later without returning to the factory for disassembly, greatly reducing later maintenance cost.

Can the 2.4GHz and 915MHz bands of GemX transmit signals at the same time?

Leveraging the dual-RF hardware architecture of the LR1121 single chip, it supports simultaneous independent transmission on both bands, enabling parallel transmission of primary and backup links. When one band's signal is interrupted, the other can take over seamlessly, improving link reliability by 60% compared with single-band modules.

Are there any special requirements for the installation of the two-band antennas?

The distance between the 2.4GHz and 915MHz antennas should be ≥5cm to avoid signal mutual interference caused by co-located installation. It is recommended to pair the 915MHz band with a high-gain omnidirectional antenna of the corresponding band to further improve diffraction and penetration capability.

Can this module directly replace the original single-band ELRS TX Module?

It supports the standard JR bay interface, with hardware dimensions and pin definitions fully compatible with conventional single-band ELRS modules. No hardware modification is required for existing remote controls, you can complete deployment by directly plugging and replacing it.

 

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