Lehigh Valley Mesh

AREDN

The Amateur Radio Emergency Data Network (AREDN) is a high-speed, IP-based wireless mesh network designed specifically to support emergency and public service communications using licensed amateur radio spectrum.

AREDN enables communities to deploy resilient data networks that function independently of the internet and commercial infrastructure, providing critical connectivity when traditional systems are unavailable or overloaded.

What Is AREDN?

AREDN is a mesh networking platform for licensed amateur radio operators that uses repurposed commercial wireless hardware operating on amateur radio frequencies.

Unlike low-bandwidth messaging meshes, AREDN is designed to carry full IP traffic, enabling services such as:

  • Voice over IP (VoIP)
  • Video streams
  • File transfer
  • Web services
  • Situational awareness dashboards
  • Emergency coordination tools

AREDN networks are decentralized, self-healing, and locally controlled.

Why AREDN Matters

During emergencies, modern response efforts rely heavily on data—not just voice.

AREDN provides:

  • High-bandwidth local networking
  • Infrastructure independence
  • Rapid deployment capability
  • Interoperability with emergency services and agencies

When cellular networks fail or become congested, AREDN can continue operating as a standalone data backbone, supporting communication between emergency operations centers, shelters, hospitals, and field teams.

How AREDN Works

AREDN uses modified firmware installed on supported wireless radios. These radios automatically discover neighboring nodes and form a self-configuring mesh network.

Key characteristics:

  • Operates in amateur radio frequency bands
  • Uses standard IP networking
  • Supports routing over multiple paths
  • Automatically adapts to node loss or movement

Each node can host or access services directly on the mesh, without requiring external connectivity.

Line of Sight and Network Planning

AREDN is a high-bandwidth, microwave-based mesh network, and its performance depends heavily on line of sight (LOS) between nodes.

Unlike low-frequency, low-data-rate mesh systems that can tolerate obstructions, AREDN operates at higher frequencies where buildings, trees, and terrain can significantly impact signal strength and reliability.

What Line of Sight Means

For AREDN, line of sight means:

  • A clear or mostly clear visual path between antennas
  • Minimal obstructions such as buildings, trees, or terrain
  • Adequate antenna height to overcome local obstacles

In many cases, elevation matters more than distance. A short link with obstructions can perform worse than a longer link with clear line of sight.

Fresnel Zone Considerations

In addition to visible line of sight, AREDN links require clearance of the Fresnel zone, an invisible area around the direct signal path.

  • Trees and structures intruding into the Fresnel zone can degrade performance
  • Partial clearance may work, but full clearance improves reliability
  • Seasonal foliage changes can affect links over time

Proper planning helps avoid intermittent or degraded connections.

Typical AREDN Link Distances

With proper planning and clear line of sight:

  • Short urban links may span several miles
  • Elevated rural links can span tens of miles
  • Backbone links between high sites can reach even farther

Actual performance depends on antenna selection, elevation, frequency band, and environmental conditions.

Why This Matters for Emergency Use

During emergencies, reliability is critical.

Line-of-sight planning ensures:

  • Stable links under load
  • Predictable performance
  • Reduced need for on-site troubleshooting
  • Faster deployment during incidents

Well-planned AREDN networks are more resilient, easier to maintain, and better suited for public service communications.

Site Selection and Planning Support

Successful AREDN deployments often involve:

  • Rooftop or tower mounting
  • Use of existing public, private or portable infrastructure
  • Path analysis and coverage modeling
  • Incremental testing and optimization

Link planning is critical to the success of an AREDN deployment. Tools such as the UISP planner can help with planning and node placement. https://ispdesign.ui.com/#

When AREDN Is Not the Best Fit

If clear or near-clear line of sight is not achievable, other mesh technologies may be more appropriate.

Lower-frequency, low-power mesh systems can:

  • Operate with partial obstructions
  • Require less elevation
  • Trade bandwidth for flexibility

LV Mesh supports multiple technologies to match real-world constraints.

Common AREDN Deployment Models

Fixed Infrastructure Nodes

Installed at elevated locations such as:

  • Towers
  • Rooftops
  • Water facilities
  • Public buildings

These nodes form the backbone of regional coverage and are often powered by grid, battery, or solar systems.

Portable & Rapid Deployment Nodes

Designed for temporary use during:

  • Emergency incidents
  • Field exercises
  • Public service events
  • Disaster response

These nodes can be deployed quickly and relocated as needed.

Service Nodes

AREDN supports hosting services directly on the network, including:

  • VoIP PBX systems
  • Incident command dashboards
  • Camera feeds
  • Messaging platforms
  • Mapping and situational awareness tools

This allows critical applications to remain available even when the internet is down.

Power & Long-Term Operation

AREDN nodes are commonly deployed with:

  • Low-power radios
  • Battery systems
  • Solar charging
  • Minimal ongoing maintenance requirements

This enables long-term, unattended operation and grid-independent deployments, making AREDN suitable for emergency preparedness and contingency planning.

Licensing & Participation

AREDN operates exclusively under FCC amateur radio regulations.

To participate:

  • A valid amateur radio license is required
  • Encryption is not permitted on amateur bands
  • Communications must comply with FCC Part 97 rules

These requirements ensure regulatory compliance while enabling broad experimentation and public service use.

AREDN and LV Mesh

Within LV Mesh, AREDN is recognized as a high-capacity emergency data layer that complements other mesh technologies.

LV Mesh supports AREDN by:

  • Encouraging interoperability and coexistence
  • Promoting responsible, licensed operation
  • Integrating AREDN into broader emergency preparedness discussions
  • Supporting education and experimentation

AREDN is not required to participate in LV Mesh, but it represents a powerful option for licensed operators seeking advanced capabilities.

When AREDN Is the Right Choice

AREDN is especially well suited for:

  • Emergency operations centers
  • Municipal coordination
  • Hospital and shelter connectivity
  • High-bandwidth situational awareness
  • Inter-agency communications
  • CCTV systems for large events requiring monitoring over large public spaces or remote internet connectivity

For simple messaging or ultra-low-power use cases, other mesh technologies may be more appropriate. AREDN excels when data capacity and service hosting are critical.

Learn More About AREDN

Authoritative resources:

Getting Involved

If you are a licensed amateur radio operator interested in AREDN:

  • Join the LV Mesh community
  • Explore local AREDN activity
  • Participate in exercises and testing
  • Learn how AREDN fits into regional emergency planning

AREDN offers a powerful way to contribute advanced technical skills to community resilience.

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