The ITU‑R Recommendation P.833‑2 provides guidance on estimating radio‑wave attenuation caused by vegetation for frequencies between 30 MHz and 60 GHz. Because foliage conditions vary widely and experimental data are limited, the recommendation offers separate models for different frequency bands and path geometries. For a terrestrial link with one end inside a woodland, the extra loss is expressed using two parameters: the specific attenuation rate γ (dB / m) that describes short‑range scattering loss, and a maximum attenuation Am that caps the total excess loss due to additional mechanisms such as surface‑wave propagation and forward scattering. The excess attenuation for a path length d inside the vegetation is given by Aev = Am 1 – exp(–d γ / Am) » . This formulation allows engineers to calculate the additional loss when a transmitter or receiver is located within dense vegetation.
Information about Meshtastic, an open-source, decentralized, off-grid mesh network, and the MDARC's involvement with it, including node locations and configurations.
The Heltec WiFi LoRa 32 (V4) is an ESP32-S3-based off-grid LoRa/Meshtastic communicator with solar charging, optional GNSS, and a high 28dBm transmit power.
A terminal interface for chatting via Meshtastic mesh networks with real-time message display, node discovery, and radio configuration.
A Pygame-based Meshtastic / LoRa node visualizer for offline SIGINT and field research, reading live serial data to display GPS positions, mesh links, and signal reach in real time.
Meshquake monitors real-time earthquakes via USGS and sends alerts over Meshtastic mesh radios.
Details the restrictions when using a public MQTT broker with Meshtastic, focusing on TLS/SSL requirements, authentication, and potential issues with server reliability and rates.
Real time data from around the San Francisco bay area and beyond. This page contains a live chat log of messages from various nodes in the mesh network, discussing connectivity, testing, and general updates.
Frozen intends to be a radio BBS optimized for slow connections. This is the very beginning of the project. It has a working message board, admin tools, a terminal client, and a server supporting serial and TCP connections to Meshtastic radios.
