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.
Meshtastic is an open-source mesh networking platform designed to facilitate decentralized, long-range, and ad-hoc communication. This article provides a full guide on how to get started, covering its features, use cases, compatible hardware, and setup instructions.
It is a high-performance tracker designed for Meshtastic, as small as a credit card, effortlessly fitting in your pocket or attaching to your assets. It embeds Semtech's LR1110 (Supports 863-928 MHz range), Nordic's nRF52840, and Mediatek's AG3335 GPS module, providing Meshtastic users with a high-precision, low-power positioning and communication solution.
OpenEmbed is creating the MeshWalkie, a Meshtastic-ready LoRa handheld using the housing of a Baofeng UV-K6 radio. It features an Espressif ESP32-S3, a Seeed Studio Wio-SX1262 LoRa transceiver, and a Seeed L76K GNSS receiver, all on a custom PCB. The project aims to provide a rugged, open-source alternative to 3D-printed or expensive injection-molded handhelds.
Meshnology offers a range of IoT and Meshtastic related products including ESP32 LoRa modules, batteries, antennas, development boards, sensors, and cases.
Meshtastic is an open-source project that provides long-range, off-grid communication using inexpensive LoRa radios. It allows users to send text messages, GPS locations, and voice messages over long distances without relying on internet or mobile networks.
A tutorial on how to flash Meshtastic with the Fancy UI firmware on the LILYGO T-Deck Plus, including detailed steps and troubleshooting tips.
Meshtastic offers a text messaging service that operates without internet, satellite, or cellular connections, using radios to send and receive messages and GPS coordinates. It's designed for ease of use, allowing anyone to communicate in areas without cellular coverage or as a backup communication method.
Utilizing LoRa (Long Range) technology, Meshtastic connects nodes (small, battery-powered radios) within signal range, forming a mesh network. Messages hop from node to node, reaching recipients even without direct line-of-sight, thanks to the mesh's retransmission capability. Security is maintained through encryption, ensuring that only intended recipients can read messages.
**Getting Started:**
1. **Choose a Node:** Select a LoRa node compatible with your region (915MHz for North America, 868/433MHz for Europe). Popular choices include the HelTec ESP32 LoRa V3 and the Seed Studios SenseCAP T1000-E.
2. **Install Meshtastic:** Flash your node with Meshtastic software using instructions from flasher.meshtastic.org.
3. **Download the App:** Install the Meshtastic app on your device to pair with the node and join the mesh.
4. **Join a Mesh:** Connect with existing nodes in your area or start your own mesh network. Engage with local mesh groups via channels like LongFast for community interaction.
Utilizing LoRa (Long Range) technology, Meshtastic connects nodes (small, battery-powered radios) within signal range, forming a mesh network. Messages hop from node to node, reaching recipients even without direct line-of-sight, thanks to the mesh's retransmission capability. Security is maintained through encryption, ensuring that only intended recipients can read messages.
**Getting Started:**
1. **Choose a Node:** Select a LoRa node compatible with your region (915MHz for North America, 868/433MHz for Europe). Popular choices include the HelTec ESP32 LoRa V3 and the Seed Studios SenseCAP T1000-E.
2. **Install Meshtastic:** Flash your node with Meshtastic software using instructions from flasher.meshtastic.org.
3. **Download the App:** Install the Meshtastic app on your device to pair with the node and join the mesh.
4. **Join a Mesh:** Connect with existing nodes in your area or start your own mesh network. Engage with local mesh groups via channels like LongFast for community interaction.
The T-Deck is a compact device with a 2.8-inch IPS LCD touch screen, integrated keyboard, trackball, microphone, and speaker, running on an ESP32-S3 dual-core processor. It supports various frequencies and includes a GPS module and battery in its Plus variant. It features a U.FL/IPEX antenna connector for LoRa and can be flashed using Espressif's firmware download mode.
