Antennas & Link Budgets for Wi-Fi HaLow (920MHz)2026-02-03RF and antenna fundamentals for 920MHz Wi-Fi HaLow (802.11ah): wavelength scaling, 50Ω impedance matching, VSWR, gain, polarization, detuning, and link budget basics. Focused on practical sub-GHz range and antenna efficiency.
Browser-First, Offline Data Services Demo2026-01-11A single-node, offline network that boots from SD, exposes a captive portal, and serves real-time chat and maps to stock smartphones—no apps, no Internet.
Stable Battery Power for Single-Board Computers2025-11-15A practical, referenced guide to running SBCs reliably from power banks, with Raspberry Pi and Anker 737 examples.
Genuinely Autonomous Systems: Local Mesh Networks for Disaster Procurement2025-10-12Procurement still privileges centralized, carrier-managed networks even though unlicensed, community-operated meshes can preserve local services under isolation. Drawing on Japan's experience—2011 Tōhoku, ARIB STD-T108, Wi-Fi HaLow pilots—this essay sets out the evidence base and proposes procurement tests that value local continuity.
Field-Ready Emergency Ad-Hoc Networks for Real-World Deployments2025-10-11Two decades of 'infrastructure-less' research delivered elegant routing but poor usability. This article explains why and proposes a five-axis feasibility lens—App Needed, Proprietary, Browser Access, Self-Deployable, Long Range—centered on a browser-first mesh substrate.
Satellite-to-Phone and HaLow Mesh Resilience Networks2025-10-09Local, battery-first sub-GHz meshes keep people connected indoors while satellites bridge islands and remotes.
LoRa with UAVs: extending sub-GHz IoT coverage2025-10-04Experiments show UAV-mounted LoRa nodes extend coverage in suburban and urban deployments, with lessons for Wifi HaLow.
Seventeen Minutes to Move — Lessons from Nobeoka's Wifi HaLow field trial2025-10-01Independent Japanese field trial shows Wifi HaLow neighborhood voice, periodic imaging, and passive tags can coordinate evacuation under a tight tsunami window.
HaLert — evidence for HaLow data + LoRa control in emergencies2025-09-27Independent results indicate Wifi HaLow can carry citizen/telemetry traffic while a LoRa control mesh keeps operations responsive.
Operating Systems for TAK Server on Raspberry Pi Deployments2025-09-21Evaluating OS options and radio support for LoRa and Wifi HaLow on Raspberry Pi hardware.
Long-Range Wifi with 802.11n2025-09-20802.11n promised high throughput, but what happens when you stretch it for distance?
Citizen-operated MANET with Wifi HaLow2025-09-05A practical, off-grid IP mesh built from open source and commodity radios.