What a ham radio mesh network is
A mesh network is a group of radio nodes that connect to each other and pass data along, so a message can hop across several nodes to reach its destination. If one node drops out, traffic can often find another route. Hams use mesh networks for local communications, experimentation, and as a backup that does not depend on the internet or cell service. Two approaches dominate: AREDN and LoRa-based systems such as Meshtastic.
AREDN: high-speed amateur mesh
AREDN (Amateur Radio Emergency Data Network) is firmware that runs on common off-the-shelf Wi-Fi-class radios. It reconfigures them to operate within amateur allocations in bands such as 2.4 GHz, 3.4 GHz and 5.8 GHz, depending on the hardware and region. Nodes find each other and route traffic automatically. Users can run services on the network, such as chat, voice over IP, video, file sharing, and web pages, all inside the mesh.
Because it uses amateur frequencies, using AREDN requires an amateur license. Operators also follow rules for identification and content. Check the project’s current documentation and your regulator’s rules, since the supported hardware and channels change over time.
LoRa mesh and Meshtastic
LoRa is a long-range, low-bit-rate radio technique. Meshtastic is a popular open-source project that uses small, inexpensive LoRa devices to send short text messages and location data through a mesh. Data rates are low, so it suits text and telemetry rather than video or large files. Range can be several kilometers in good conditions, and much less in dense areas or indoors.
Do I need a license for Meshtastic?
It depends on how you use it. Many Meshtastic devices operate in unlicensed ISM bands (for example, around 915 MHz in the Americas and 868 MHz in much of Europe), where a license is generally not required if the equipment complies with local rules. That said, some people run LoRa on amateur frequencies instead, which requires a license. In that case, amateur rules apply, including identification and, in many countries, restrictions on encrypting or obscuring message content. Settings such as encryption need to be checked against your regulator’s rules. This varies by country, so verify locally.
Comparison
| AREDN | Meshtastic (LoRa) | |
|---|---|---|
| Typical speed | High (supports video, VoIP, files) | Low (short messages) |
| Typical hardware | Wi-Fi-class radios with custom firmware | Small LoRa boards with batteries |
| Licensing | Amateur license required | Often unlicensed ISM, or amateur if used there |
| Power use | Higher, usually fixed sites | Low, can be portable |
| Best for | Local data network, emergency data | Text messaging, off-grid tracking |
Getting started
- Decide what you need: text and position (LoRa) or a data network with services (AREDN).
- Look for a local group. Mesh networks only work if other nodes are nearby, so a club or regional mesh community can save you time.
- For Meshtastic, buy a supported device, flash the current firmware, set your region, and pair it with the phone app. Place the antenna as high and as clear as practical; antenna height makes a big difference.
- For AREDN, pick supported hardware from the project’s list, flash the firmware, enter your call sign, and follow the setup guide for your region.
- Test with one other node before building more.
Mesh system for a router vs ham mesh
A home mesh Wi-Fi system sold for routers is a consumer product that extends internet coverage in a house, using unlicensed Wi-Fi. A ham mesh network is a separate, community-built network on amateur frequencies or LoRa. They share the word “mesh” but are not the same thing.
Are ham radios EMP proof?
No radio can be assumed to be immune to a strong electromagnetic pulse. Claims of that kind are often exaggerated. Equipment that is disconnected and stored with protection may fare better, but there are no simple guarantees. For practical preparedness, keep spare equipment and a plan that does not rely on one device.
Uses
- Local text messaging during outings and events.
- Backup data links for community groups and emergency communications.
- Experimentation with antennas, routing and networking.
For other methods of moving data over ham frequencies, see packet radio for hams, or compare with weak-signal modes in digital mode identification. Band information for related modes is in ham radio digital mode frequencies.