An Introduction to Our AREDN Mesh Network
Good evening, everyone. It's a real pleasure to be here with you all tonight. As amateur radio operators, we share a deep appreciation for communication and a foundational understanding of its importance. We’ve built stations, chased DX, and perhaps even participated in emergency drills, all of which contribute to our readiness and our love for the hobby. Today, I want to introduce you to a particularly exciting evolution within amateur radio, one that combines our passion for the airwaves with the immense power of modern computer networking. I’m here to talk about our the Amateur Radio Emergency Data Network, or AREDN mesh network.
AREDN is truly an amazing fusion of two worlds: radio and computer technology. It’s an aspect of the hobby that is perfect for those of us who have a foot in both camps and want to explore the possibilities of bringing them together in a meaningful way. The core concept is both elegant and powerful: we take readily available, commercial off-the-shelf Wi-Fi hardware—the kind of routers and access points you might find at any electronics store—and we "reflash" them with specialized, open-source firmware. This process completely changes the device's function, allowing it to operate on authorized amateur radio frequencies, such as those in the 5 GHz and 2.4 GHz bands. The result is a high-speed data network that is similar to, but independent of the commercial internet and public utility infrastructure. This independence is not just a technical detail; it’s a strategic advantage, especially in situations where traditional communication fails. This ability to move significant amounts of data—from simple text messages and documents to high-resolution images and even live video streams—quickly and reliably over the air is perhaps its single greatest selling point and a game-changer for our community.
One of the most important principles of our local AREDN network is its design as a persistent, always-on infrastructure system, not necessarily a collection of ad-hoc nodes. While individual, portable and base station nodes have their place in tactical situations, our community's main effort is to build a robust and resilient network that exists before a crisis. This is our backbone, a network of strategically placed relays, endpoints, and high-gain antennas that provide broad, reliable coverage across the community. You can think of it less like a handheld radio and more like a permanent network of high-speed data cell towers. This persistent infrastructure ensures that when we need it most—whether for a large-scale event, an emergency, or simply a weekend of experimentation—the network is already in place and ready to be used by any operator within range. It’s a proactive approach to readiness that maximizes our collective capability.
For our local AREDN network, we have made the important and collective decision to standardize on the 5 GHz band. This wasn't an arbitrary choice. The 5 GHz spectrum offers several key advantages. Most importantly, it provides a significantly wider channel bandwidth than the more common 2.4 GHz band. This translates directly to higher data throughput and better performance. Furthermore, the 2.4 GHz band is incredibly congested with consumer Wi-Fi, Bluetooth devices, cordless phones, and even microwave ovens, all of which contribute to a high level of interference. By using 5 GHz, we are operating in a much cleaner and quieter part of the spectrum, which allows for clearer and more reliable links. While the signals at 5 GHz don’t propagate as far as those on 2.4 GHz, we've found that for our needs, the trade-off in range is more than compensated for by the dramatic improvement in network performance and stability.
If you look at our current network map, you’ll see our priority sector targets. Right now, we have strong coverage and anchor points strategically located in Southwest Eugene, Peacehealth Riverbend, and the Thurston Hills area, with more to come. These are not random spots; they were chosen for their elevation, clear line of sight, and ability to serve a wide geographic area, including key community assets like hospitals and emergency operations centers. To achieve this broad coverage, we use two main types of antennas. Sector antennas are designed to provide a wide-angle broadcast, typically covering a 90 to 120-degree arc. These antennas are ideal for serving a large number of clients within a specific geographic area from various hilltops. In contrast, for creating long-distance, point-to-point links between two high points, we use highly focused directional dish antennas. These antennas act like a powerful laser, sending a very narrow, high-gain beam of data to a specific, distant location. These backbone links are the very foundation of our network, connecting different coverage areas and allowing data to flow seamlessly across the entire system.
Once you’re connected to the network, the possibilities are vast. AREDN offers a number of useful services that are all hosted locally on our own servers, or hosted by various enthusiasts at their home and office endpoints. These services are typically accessed through a standard web browser on your computer. Some of the most common and useful services include VoIP (Voice over IP) phone systems, allowing for high-quality voice communication between nodes on the network; a mesh chat service for instant text messaging; and custom maps that dynamically show the topology of the network, the location of other active nodes, and the services available. Beyond these, the network can be configured to host almost anything you can imagine: file servers for sharing large documents, web pages for sharing important information, and even live video feeds from key locations. The truly beautiful thing about these services is that they are entirely self-contained within our network, meaning they function perfectly even if the commercial internet goes down.
A crucial piece of our infrastructure is the LCcore data center in downtown Eugene. This is a secure, stable, and reliable location that serves as a central hub for our AREDN community. It houses several key servers and provides essential connectivity for different parts of our ham network. LCcore is a point of convergence where backbone links meet and where vital servers are hosted. It's a critical resource that helps ensure the system's overall reliability and availability, offering services that benefit every single user on the network. Without LCcore, our network would be far more fragmented and less reliable.
You might be wondering, "Who runs this whole thing?" The answer is that our AREDN system does not have a central governing body in the traditional sense. It operates on a truly decentralized, collaborative model. Instead of a top-down management structure, a group of dedicated and expert network engineers from our community meets regularly to discuss and troubleshoot technical issues, plan for future expansions, and ensure the network's health and security. This approach fosters innovation, flexibility, and a strong sense of community ownership, as the network's growth and improvement are a direct result of the collective efforts and contributions of its users. Everyone has a voice and the opportunity to contribute.
While AREDN is an excellent tool for emergency communication—operating independently of commercial power and internet—it is so much more. In a disaster scenario, its ability to move data, including email via systems like Winlink, makes it an invaluable asset for agencies and communities. But AREDN is also a phenomenal platform for regular hams and experimentation. It’s an entire sub-hobby in its own right, allowing us to dive into the world of IP networking, server administration, routing, and scripting. It provides a hands-on learning environment that complements our traditional radio skills and offers a clear pathway into a new, technically rich aspect of amateur radio.
The history of the AREDN project is a testament to this spirit of experimentation and collaboration. It was born out of a community desire to adapt consumer Wi-Fi equipment for our purposes, and the open-source firmware that runs it was created and is maintained by a dedicated group of volunteer amateur radio operators and software engineers. This collaborative, community-driven approach is what makes AREDN so special and so resilient.
In closing, our local AREDN network is a living, breathing project. It’s a powerful tool for emergency communication, a playground for technical experimentation, and a fantastic example of what can be accomplished when we combine our passion for radio with the possibilities of modern computer networking. Its greatest strength is its ability to move data at high speeds, opening up a world of possibilities for us as amateur radio operators.
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