2.4 GHz Meshtastic

When I was first introduced to Meshtastic, I assumed it lived entirely in the sub-GHz world—868 MHz in Europe and 915 MHz in the US. That wasn’t entirely true, with 433 MHz also having a presence, but the pattern was clear: Meshtastic was built around long-range communication in ISM bands where no licence is required (within regulation, of course).

Now, with the introduction of the LORA_24 setting, that assumption gets challenged.

So the question is: is this a new chapter for Meshtastic—or just an additional one?

What Normally Lives in the 2.4 GHz ISM Band

The 2.4 GHz ISM band is one of the busiest pieces of radio spectrum we use today—and chances are you’re already relying on it without even thinking about it.

Originally set aside for industrial, scientific, and medical equipment, it eventually became a license-free playground for wireless communication. That decision is what opened the floodgates for the devices we now take for granted.

Today, this band is home to things like Wi-Fi, Bluetooth, and a wide range of smart home devices. It’s also where your microwave oven operates—occasionally reminding you it exists by messing with your Wi-Fi just enough to be annoying.

What makes 2.4 GHz so popular is that it strikes a practical balance. It has enough range to cover a house or office, can pass through walls reasonably well, and supports decent data rates for most everyday uses. That’s why it became the default for so many consumer technologies.

But there’s a tradeoff.

Because it’s unlicensed and so widely adopted, it’s also incredibly crowded. All these devices are effectively shouting into the same space, which leads to interference, congestion, and sometimes unpredictable performance.

In short, the 2.4 GHz band isn’t clean or quiet—but it’s everywhere. And that makes it both incredibly useful and surprisingly challenging to work with.

And now… Meshtastic wants to live here too.

So What Frequency Does Meshtastic Actually Use

The 2.4 GHz band is often loosely described as spanning 2400 MHz to 2500 MHz—but in practice, not all of that spectrum is available.

The usable ISM portion for general devices is 2400 MHz to 2483.5 MHz. Above that, the 2483.5–2500 MHz range is heavily restricted in most regions, allowing only very limited use cases.

Meshtastic firmware therefore operates strictly within the 2400–2483.5 MHz ISM band, and unlike sub-GHz, this range is globally consistent.

Important: This is still LoRa—it’s not a new protocol, just a new frequency space.

Constraints & Tradeoffs

A lot of European users might be very excited about this band being enabled for Meshtastic. I believe one of the biggest attractions would be the fact that we would be able to use SHORT_TURBO with a bandwidth of 500kHz, together with a 100% duty cycle.

With EU_868 you only have one channel with 250kHz. The 2.4GHz band opens up 167, 500kHz channels.

This is where things get interesting—not for range, but for density and flexibility.

But like with most things in life, there are some new constraints that has to be taken into consideration.

Firstly, transmit power is limited to 10 dBm (10 mW) compared to 27 dBm (500 mW) on EU_868 devices. That’s not a small difference—that’s roughly 50x less transmit power. With the SHORT_TURBO setting the effective distance of communication will be much shorter than users are used to on the sub-GHz band, but still likely longer range than your typical Wi-Fi network.

This band is also heavily congested. While many devices use spread spectrum techniques and are designed to coexist, they still raise the overall noise floor. In practice, this means deploying a Meshtastic network here may require some experimentation to find a clean and reliable channel.

Then there’s just physics. 2.4 GHz has higher path loss (roughly 8–9 dB more than sub-GHz), meaning signals don’t travel as far.

At higher frequencies, your antenna effectively “captures” less of the signal. It’s a bit like trying to collect very fine rain with the same bucket—you end up with less, even if the total energy is the same.

By the way, SHORT_TURBO is also available on EU_433, something new I learned—and one of the reasons I enjoy prepping these blogs.

What Hardware Is Available Already

All of this is wonderful, but if we don't have any equipment that enables us to use this frequency, we’re still just talking theory. At the point that I wrote this blog there are not that many modules that have the 2.4GHz transmit and receive capability.

At least Semtech already supports this frequency.

The Semtech SX1280 is a 2.4 GHz LoRa transceiver designed for ultra-long-range, low-power wireless communication with integrated Time-of-Flight (ToF) ranging capabilities.

The Semtech LR1121 is a multi-band LoRa transceiver designed for global connectivity across sub-GHz, 2.4GHz, S-Band, and L-Band frequencies, supporting multiple modulation schemes and flexible configurations.

These chips are currently available on:

• LILYGO T3 S3 LR1121
• LILYGO T3 S3 SX1280
• Muzi Works Base Duo

Let us keep watching this space—I personally would love to see a Heltec device with a LR1121 chip.

What Does This Open Up

So what does all of this actually enable?

One of the experimental modules in Meshtastic is an audio module, where adding a digital I2S microphone and speaker enables audio packets on the mesh. The module has been designed for channels with 2 kbit/sec of bandwidth or greater.

For antenna enthusiasts, this band opens up a whole new playground—compact 2.4 GHz PCB antennas, directional Yagis, and reflector designs. And yes, it probably means new VNA toys… but who doesn’t enjoy that?

It may also open up new higher-bandwidth mesh links for things like a Mesh BBS.

And then there is experimenting and working with Reticulum—but that’s a topic for a whole other blog.

Reality Check: Is This a Replacement?

I don’t see this as the next chapter of Meshtastic—I see it as an additional one.

Sub-GHz still makes more sense for distance.

2.4 GHz, on the other hand, may become a tool for higher bandwidth links, dense deployments, or connecting clusters of nodes.

Closing Thought

I’m just excited to have another frequency to experiment with—especially when it comes to antennas and hardware.

For me, 2.4 GHz Meshtastic isn’t about going further—it’s about exploring new ways to build and interact with the mesh.

Waiting to hear your thoughts and comments.

Written by JohanV
2026-04-13