Topic

Guides

Step-by-step assembly & field tutorials

All ESP32 LoRa Protocols Hardware Wi-Fi HaLow Wi-Fi Unlicensed / Part 15 MeshCore Guides

Nov 04, 2026

Technical vector illustration of Zigbee 3.0 coordinator, routers, end devices, and 2.4 GHz channel overlap map highlighting Channel 26 restricted band

Zigbee 3.0 & 802.15.4: 2.4 GHz Mesh Mechanics, Coexistence & Channel 26

A builder's guide to IEEE 802.15.4 and Zigbee 3.0: Coordinator/Router/End Device roles, 2.4 GHz Wi-Fi overlap maps, the Channel 26 FCC restricted band trap, and local ZHA control.

9 min read

Sep 23, 2026

LoRaProtocolsUnlicensedGuides

Technical vector illustration of LoRaWAN US915 gateway, outdoor collinear antenna, and Class A/B/C end devices with uplink frequency spectrum

LoRaWAN in the US: Architecture, US915 Channels, and Part 15 Reality

A builder's guide to LoRaWAN network architecture, US915 uplink/downlink channels, Class A/B/C receive windows, OTAA nonce traps, and FCC Part 15 limits.

9 min read

Sep 16, 2026

LoRaUnlicensedGuidesHardware

Technical illustration of LoRa chirp spread spectrum waveforms, SX1262 transceiver module, and FCC Part 15 regulatory framework

What LoRa Actually Is: Physical Layer Mechanics, FCC Part 15, and the 1-Watt Trap

A builder's guide to Chirp Spread Spectrum physics, symbol time math, why 125 kHz LoRa cannot use the §15.247 1-Watt digital modulation shortcut, and how Part 15 differs from Part 97.

8 min read

Sep 09, 2026

GuidesUnlicensedProtocolsMeshCore

Technical illustration showing spectrum analyzer displays and signal sweeps across LoRa, Wi-Fi HaLow, Sub-1GHz, and 2.4 GHz bands

Welcome to OpenRF Note: An Unlicensed RF & Wireless Notebook

Why OpenRF Note exists: documenting FCC Part 15 unlicensed spectrum, exhaustive channel rosters, protocol packet framing, coexistence maps, and diagnostic RF engineering in the open.

5 min read

All 9 entries