If you’re an FPV pilot, you’re always looking for ways to get more out of your gear—better range, faster response times, and a rock-solid connection, no matter where you’re flying. Enter the ExpressLRS Gemini Xrossband. This exciting new module brings something fresh to the table: it lets you run both 2.4GHz and 900MHz frequencies at the same time. Yep, you get the speed and responsiveness of 2.4GHz with the reliability and range of 900MHz—all in one package.
In this blog, we’re going to dive into what makes the Gemini Xrossband special, how it works, and why it’s quickly becoming the go-to choice for FPV pilots.
What Exactly is the ExpressLRS Gemini Xrossband?
Simply put, the Gemini Xrossband is a dual-band transmitter module that lets you use 2.4GHz and 900MHz at the same time. No more choosing between the two or worrying about switching bands manually. With the Gemini Xrossband, both frequencies are active, meaning you can enjoy the low latency of 2.4GHz while also having the extended range and better penetration of 900MHz.
But there’s more to it than just dual-band operation. This module is powered by the LR1121 transceiver from Semtech, which is a next-gen chip that gives you access to 150MHz to 960MHz (sub-GHz) and even the 2.1GHz S-Band. In short, it’s super versatile.
What Makes the LR1121 Transceiver So Special?
The LR1121 is the engine behind the Gemini Xrossband. It’s designed to cover a wide range of frequencies and has some serious power under the hood. Here are the key highlights:
- Sub-GHz Compatibility: It’s fully compatible with the 900MHz ExpressLRS system, so you can still use all your existing gear while tapping into the benefits of dual-band.
- More Power: The LR1121 offers up to +100mW output power, giving you a stronger, more reliable signal, especially during long-range flights.
- Faster Sub-GHz Modes: Thanks to the addition of SF5 modulation, the sub-GHz range is faster than ever, so you won’t have to sacrifice performance for range.
All of this adds up to a more reliable, more powerful, and faster control link, which means you can push your flights further without worrying about losing connection.
Why Dual-Band? The Key Features of ExpressLRS Gemini Xrossband
- Simultaneous Dual-Band Operation: The biggest selling point here is the ability to use 2.4GHz and 900MHz together. This gives you the best of both worlds: low-latency, fast control with 2.4GHz and extended range with 900MHz. Fewer signal drops and a more consistent connection no matter where you’re flying.
- Built on the LR1121 Chipset: With the LR1121, you’re getting more than just dual-band support. The added S-Band and higher power output (+100mW) mean better performance across
a wider range of frequencies. Plus, the faster sub-GHz speeds make your connection feel snappier, even at longer distances.
- Seamless Failover: One of the coolest features is that the Gemini Xrossband can automatically switch between 2.4GHz and 900MHz. If one band experiences interference or gets weak, the system shifts to the other without dropping your connection. This makes flying more reliable, even in tricky environments.
- Ultra-Low Latency on 2.4GHz: For racing and freestyle, latency is everything. The 2.4GHz band gives you lightning-fast response times, so your drone reacts instantly to your inputs. But thanks to the dual-band setup, you’re also backed by the reliability of 900MHz in the background.
- Long-Range Capability on 900MHz: When you’re flying long distances or in areas with lots of obstacles, the 900MHz frequency really shines. It cuts through interference better than 2.4GHz, giving you greater range and a more stable connection when you’re far out or flying through trees, buildings, or other obstacles.
- Open-Source Flexibility: Like all things ExpressLRS, the Gemini Xrossband is open-source, so you can tweak and adjust the settings to fit your flying style. Want to adjust the power output or change packet rates? No problem. The customization options are nearly endless.
How Does Dual-Band Improve Your FPV Experience?
Running both 2.4GHz and 900MHz at the same time isn’t just a cool feature—it changes how you fly. Here’s how it makes a difference:
- Best of Both Worlds: You get the speed and responsiveness of 2.4GHz for racing and acro flying, while 900MHz adds that extra reliability for longer flights or when you’re flying through obstacles. No more trade-offs.
- No More Signal Drops: If one band gets weak, the system automatically switches to the other. This means fewer signal interruptions, giving you smoother, safer flights.
- Flying in Challenging Areas: In dense areas like forests or urban environments, 900MHz is ideal for punching through interference. The added power from the LR1121 transceiver gives you a stronger, more reliable connection when flying through tough spots.
How to Set Up the Gemini Xrossband
Getting the ExpressLRS Gemini Xrossband up and running is pretty straightforward. If you’re already familiar with ExpressLRS, you’ll be flying in no time:
- Update Firmware: First, download the latest firmware from the ExpressLRS GitHub that supports the LR1121 chipset.
- Install the Module: Plug the Gemini Xrossband module into your radio transmitter (like the Radiomaster TX16S or TBS Tango 2).
- Configure Settings: Use the ExpressLRS Configurator to set up your dual-band operation and adjust things like power output, telemetry settings, and more.
- Bind Your Receiver: Bind your transmitter to an ExpressLRS receiver that supports dual-band, like the DBR4 Dual-Band Xross Gemini Receiver.
- Take It for a Spin: Once everything’s set up, it’s time to fly. You’ll immediately notice the smooth, consistent control, and the added reliability from using both bands.
Final Thoughts
The ExpressLRS Gemini Xrossband is a game-changer for FPV pilots. Whether you’re into long-range flying, racing, or freestyle, the ability to run both 2.4GHz and 900MHz simultaneously is a huge leap forward. You get the low-latency control you need for quick maneuvers while also benefiting from the extended range and better signal penetration that 900MHz offers.
If you’re serious about improving your FPV setup, the Gemini Xrossband is definitely worth checking out. It’s the kind of module that not only enhances your flying experience but also gives you the confidence to push your flights further and explore more challenging environments.
Ready to upgrade? The Gemini Xrossband is here to help you fly higher, further, and faster—without worrying about losing connection.