
Seeing the World with Radio Waves: The QuadRF Four-Channel Phase-Coherent SDR Project
QuadRF is an open-source four-channel phase-coherent software-defined radio (SDR) development board that pairs with a Raspberry Pi 5 to perform radio direction finding (RDF) across the 4.9–6.0 GHz band. Its standout 'RF Camera' mode delivers real-time, 30 fps visualization of signal sources. In a practical demonstration, the system successfully tracked two independent radio transmitters aboard a flying drone.
Source: Hackaday










