For those in the FPV world, the debate between 2.4GHz and 900MHz for ExpressLRS radio links is ongoing. Each has its strengths: 2.4GHz offers faster packet rates and lower latency, while 900MHz provides better penetration and range. With the release of the Radiomaster Nomad, you no longer have to choose. This dual-band ExpressLRS module gives you the flexibility to use both frequencies individually or simultaneously.
Learn more about ExpressLRS in this guide: https://oscarliang.com/setup-expresslrs-2-4ghz/
Where to Buy
Get the Radiomaster Nomad module here:
Get the Radiomaster DBR4 Receiver here:
What Is the Radiomaster Nomad?
The Radiomaster Nomad is a dual-band ExpressLRS module that incorporates the innovative Gemini-X (Xrossband) technology, enabling it to operate in both 2.4GHz and 900MHz (868/915MHz) frequencies simultaneously or individually. Both frequencies can deliver up to 1 watt of RF output power, offering versatility for different flying conditions.
2.4GHz provides faster packet rates, up to 1000Hz, delivering ultra-low latency that’s critical for racing or fast-response flying. On the other hand, 900MHz (868/915MHz) offers superior penetration and range, making it ideal for flying through obstacles or in long-range scenarios.
The Nomad’s ability to switch between these bands—or use both simultaneously—makes it one of the most versatile ExpressLRS modules on the market. In Gemini mode, data packets are sent in parallel across both bands, doubling the chances of maintaining a solid connection, especially in challenging environments with interference.
It’s important to note that you’ll need to configure the correct frequency range for 900MHz based on your location: 868MHz for Europe and 915MHz for the USA. Failing to do so could interfere with local cellular networks, so setting it up correctly in the ExpressLRS settings is crucial.
Closer Look at the Radiomaster Nomad
The Nomad module comes with dual-band antennas designed to support both 2.4GHz and 868/915MHz frequencies. These adjustable antennas allow horizontal or vertical positioning depending on your setup.
Antenna connectors are RP-SMA.
On the bottom, there are XT30 connector for external power (2S to 4S) if you don’t want to drain your radio’s internal battery, and a USB-C Port for firmware update.
The RadioMaster Nomad ships with both JR and Lite module adapters, making it compatible with a wide range of radios, including the Radiomaster Boxer and Zorro. While the Nano adapter wasn’t included in the early review units, it is expected to be part of the final retail package, ensuring full compatibility with smaller radios like the RadioMaster Zorro.
However, when installed in the Boxer, the module feels a bit loose in the bay. It’s securely locked, so there’s no risk of it coming out during flight, but it does make a rattling noise when you shake the radio.
New Packet Rates
ExpressLRS offers a variety of packet rates, allowing you to balance latency and range based on your specific needs. For example, 50Hz provides excellent range but with higher latency, while 1000Hz offers ultra-low latency at the expense of range. The Radiomaster Nomad supports a broad range of these packet rates, enabling you to tailor performance as required.
The Nomad introduces new packet rates optimized for both low latency and long-range capabilities. On 2.4GHz, you have access to standard ExpressLRS packet rates, including 50Hz, 100Hz Full, and 500Hz. For 868/915MHz, the module supports 250Hz packet rates, which is faster than older 900MHz modules that maxed out at 200Hz.
For dual-band operation, X150Hz and X100Hz Full provide the ideal balance of range, reliability, and control precision. These packet rates allow the module to transmit on both 2.4GHz and 868/915MHz simultaneously, enhancing link stability.
The DBR4 Receiver: Dual-Band Capabilities
To take full advantage of the Nomad’s dual-band Gemini system, you’ll need a receiver that supports both 900MHz and 2.4GHz, like the Radiomaster DBR4. If you don’t have a dual-band receiver, the Nomad will still function with single-band receivers, but you won’t get the full benefits of Gemini X.
The DBR4 receiver is slightly larger than typical ExpressLRS receivers due to its dual RF chipsets and advanced functionality. It’s designed for users requiring a robust, reliable link, especially in environments with high RF noise or for long-range flying.
With four antennas—two for 2.4GHz and two for 868/915MHz—this setup ensures maximum reliability when both frequencies are used simultaneously.
Practical Applications
The Nomad excels in various scenarios, making it a strong choice for different types of FPV pilots:
- Racers: Most racers fly on open fields within relatively short ranges, so they may not gain much from the dual-band feature. A standard 2.4GHz ExpressLRS setup with a 1000Hz refresh rate remains the optimal and most cost-effective choice for racing.
- Long-Range Flyers: The 900MHz band offers excellent range and penetration, especially in Gemini X mode, where both 900MHz and 2.4GHz work together to keep your radio signal strong in difficult environments. While dual-band capability may not increase your maximum range, it should improve the reliability of your radio control link.
- Casual Flyers: For those not flying long-range, the dual-band system might be overkill. Personally, 10km flights with a standard 2.4GHz ELRS system (single antenna) using just 250mW output power were possible. Although I don’t think I will be using the Gemini Xrossband system often, it provides added flexibility and reliability for challenging conditions. For most people, 2.4GHz ELRS (non-diversity) should suffice, and if you need more range, simply lower the packet rate to 250Hz or 150Hz.
Final Thoughts: Is the Radiomaster Nomad the Ultimate ELRS Module?
The Radiomaster Nomad offers remarkable flexibility, allowing you to switch between 2.4GHz and 900MHz or use both simultaneously for maximum reliability. However, it may not be a necessary upgrade for everyone. For most users, the Gemini feature could be an overkill, as a standard ELRS setup should meet their needs.
That said, if you’re looking for greater flexibility and reliability across a range of flying styles—from long-range exploration to low-latency racing—the Nomad is worth considering. Paired with the DBR4 receiver, you get a powerful, reliable system capable of handling a variety of flying conditions, from low-latency racing to long-range adventures.
Get the Radiomaster Nomad module here:
Get the Radiomaster DBR4 Receiver here:
