This guide details how to set up a Raspberry Pi with a FlightAware Pro Stick to track airplane locations up to 400km away, receiving ADS-B data and accessing FlightAware's features.
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.
Meshquake monitors real-time earthquakes via USGS and sends alerts over Meshtastic mesh radios.
Edward F. "Ed" Hare, Jr., W1RFI, a long-time ARRL Lab engineer, passed away on October 10, 2025, at the age of 75. He was a dedicated ham radio operator, RFI expert, and contributor to ARRL advocacy efforts.
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.
This article details a dsPIC-driven radio build by Minh Danh that receives FM and AM (all bands, SW, MW, LW), plays MP3s from USB, and records incoming signals. It highlights the use of Si4735 for radio functionality, TDA1308 and NS8002 for audio, and a resistor ladder for front panel button input. The project is praised for its thorough documentation.
A Python package for looking up DMR IDs from radioid.net. It's a lightweight command-line tool with features like callsign lookup, pretty table output, CSV saving, and ID lookup.
"This document is aimed at the Arduino developers, radio experimenters, hobbyists and anyone interested in building a receiver based on the Si473X IC family from Silicon Labs. This project is about an Arduino library for the SI473X BROADCAST AM, SSB and FM/RDS RADIO RECEIVERS. Frequency ranges of AM and SSB modes are 150kHz to 30MHz, and FM mode is 64 to 108 MHz."
This repository is intended to share implementations using the Si4735/Si4732 chip with the library written by PU2CLR/Ricardo Caratti. It includes projects for TTGO T-Display Board and Lilygo T-Display S3 Board.
Researchers discovered that renewable energy facilities across Central Europe use unencrypted radio signals to control power generation, posing a potential threat to the grid. If intercepted and manipulated, these signals could disrupt grid stability by causing power imbalances, possibly leading to a continent-wide blackout. This raises significant concerns about the security measures currently in place and the need for more secure alternatives like iMSys, which uses encrypted LTE for communication.
