Framework
The Resilience Stack
Seven layers that must each be independently resilient. A failure at any single layer should not eliminate all communication capability — you should always have a fallback.
Physical Medium
The physical layer is where communication actually happens — electromagnetic waves through air, light through fiber, electrons through copper. This is the layer you own or don't own, and ownership determines your resilience ceiling.
The highest-resilience media require no infrastructure at all: HF radio bounces off the ionosphere to reach global distances; VHF/UHF works line-of-sight with a $25 handheld; LoRa carries text 2–15 km per hop with no tower. Fiber, cellular, and commercial internet are the lowest-resilience options — they depend entirely on someone else's power, hardware, and willingness to keep them running.
Build at least one communication path that requires no one else's infrastructure — a licensed radio you can transmit on without any tower, backhaul, or commercial service. What license you need depends on your country; your national telecommunications authority can tell you what is available for personal and emergency use.
Detailed specs and hardware recommendations: Radio technologies → · Satellite →
Power
Every layer above this one depends on power. Build a tiered supply with at least three independent sources — so that losing any single one doesn't go dark.
- Grid power
- Highest capacity — zero resilience during outages
- Battery backup (UPS)
- Minutes to hours depending on load
- Portable battery banks
- Hours to days, rechargeable
- Solar charging
- Indefinite in good conditions, weather-dependent
- Generator
- High capacity — requires fuel supply chain
- Hand crank / thermoelectric
- Emergency last resort, very low output
Sources: Battery University cycle-life data for Li-ion cells; FEMA Power Outage Incident Annex guidance on backup power planning; manufacturer specifications from EcoFlow, Jackery, and Anker.
Hardware options and sizing guidance: Portable power →
Transport
The transport layer defines how bits move between two points — encoding, modulation, and error correction. Choose transports with the lowest infrastructure dependency.
Analog FM voice is the universal baseline: every handheld radio speaks it, no software required, intelligible even at weak signal. LoRa carries low-bandwidth text up to 15 km per hop with no infrastructure. Packet radio (AX.25) carries APRS position data and Winlink email over amateur frequencies. Digital voice modes (DMR, D-STAR) are more spectrally efficient but reduce interoperability. WiFi at licensed power levels underpins AREDN's high-speed mesh.
Each transport should be operable independently. A stack that only works when all transports are available has the resilience of its weakest link.
Hardware and software for each transport mode: Radio → · Ham digital modes →
Network
The network layer handles routing — how a message finds its way from sender to recipient when they are not in direct . Options range from no routing at all (two radios talking directly) to self-healing that route around failures automatically.
Simplex (Direct)
No routing. Two radios on the same frequency talk directly. Maximum simplicity, zero infrastructure, limited range.
Repeater-Extended
A single relay point receives on one frequency and retransmits on another, extending range. Introduces a single point of failure but dramatically increases coverage area.
Mesh Networking
Multiple nodes relay traffic for each other, routing around failures automatically. Self-healing: if one node fails, traffic finds another path. Used by Meshtastic (LoRa), AREDN (WiFi), and batman-adv/OLSR on commodity hardware.
Store-and-Forward
Messages stored at intermediate nodes and forwarded when a path opens. Used by Winlink (email over radio) and delay-tolerant networking (DTN). Critical for disaster scenarios: messages can hop node-to-node over hours without any continuous end-to-end path.
Sneakernet
Physical transport of data on USB drives or SD cards. A USB drive on a bicycle courier has higher throughput than a severed fiber link.
Mesh hardware and community network examples: Mesh networks → · Digital modes (Winlink, APRS) →
Security
Security is often treated as an afterthought in emergency communications. It deserves explicit planning before you need it.
- Encryption
- LoRa/Meshtastic supports AES-256 channel encryption. Winlink supports PGP. Analog voice is inherently unencrypted.
- Authentication
- In amateur radio, callsign identification is legally required. In mesh networks, node identity can be cryptographically verified.
- Operational security
- During emergencies, assume radio is monitored. Use plain language for coordination; avoid sensitive information on unencrypted channels.
- Jamming resistance
- Spread-spectrum modulations (LoRa, frequency-hopping) resist intentional interference better than narrow-band FM.
Sources: FCC Part 97.113(a)(4) on encryption prohibition; ITU Radio Regulations Article 25; UK Ofcom Amateur Radio Licence Terms §10; ARRL regulatory guidance on digital encryption.
Encrypted messaging apps for device-to-device comms: Offline-first apps →
Application
The application layer is what people actually use — voice calls, texts, email, maps, position tracking. Prefer applications that degrade gracefully as lower layers fail.
Voice is the universal fallback — any two radios on the same frequency. Meshtastic provides encrypted text over LoRa mesh with no internet. Winlink sends email over radio globally. APRS tracks positions via packet radio. Offline map apps (OsmAnd, Maps.me) work on a phone with no data. Each application has a different dependency profile — know which ones work at which layer of degradation.
Application details and download links: Offline-first apps → · Digital modes (Winlink, APRS) → · Mesh networking →
Coordination
The final layer — and the most neglected — is human coordination: the protocols, plans, and practices that make all the technology actually work when it matters. Hardware without trained operators and written plans fails in every disaster after-action report.
Communication plans
A written document with primary and backup frequencies, check-in schedules, contact lists, and escalation procedures. Laminate it. Physically distribute it. Don't store it only on a phone.
Regular practice
Equipment that isn't used regularly fails when needed. Monthly net, quarterly drill, annual full-scale exercise. Practice finds problems before emergencies do.
Step-by-step operational guides for building coordination capacity: Playbooks →
Sources: Hurricane Katrina After-Action Report (DHS, 2006); 9/11 Commission Report Chapter 9 on interoperability failures; Christchurch Earthquakes Royal Commission (2012); FEMA National Exercise Program guidance on communication drills.
Building Your Stack
You don't need all seven layers at once. Build incrementally, starting with the failure mode most likely to affect you.
A single licensed handheld radio and a portable battery bank. Covers local voice communication without any infrastructure.
- Voice communication within 3–8 km line of sight
- Emergency weather radio reception
- Direct contact with neighbors on the same frequency
- Independent of grid power for 8–24 hours
Add Meshtastic nodes for encrypted text messaging, and a satellite communicator for one-way or two-way messages when all terrestrial infrastructure fails.
- Encrypted text messages across a neighborhood mesh
- Position tracking without cellular or internet
- Satellite SOS or two-way messaging from anywhere
- Communication plan documented and distributed
HF radio for long-range and international communication, Winlink for email over radio, and a community mesh node that serves your street or building.
- HF radio reaches regional and international distances without satellites
- Winlink sends email globally with no internet
- AREDN or batman-adv mesh provides local IP networking
- Regular training drills and a written communication plan
Starlink or equivalent LEO satellite broadband, solar power with battery storage, and a community network with trained operators and documented procedures.
- Broadband internet independent of terrestrial infrastructure
- Solar + battery: indefinite operation without grid
- Multiple trained operators across your community
- Documented protocols and tested procedures
Next: Technologies — detailed comparisons of tools available at each layer.