This Hackaday article details a DIY passive radar system built to track aircraft by analyzing existing radio wave reflections. Unlike traditional radar, this system doesn't emit its own signal, instead relying on signals already present in the environment, specifically those used for ADS-B transmissions. The system uses a nine-element Yagi antenna to capture these reflections and a computer program to compare the direct and reflected signals, identifying aircraft.
The article discusses the challenges faced by hobbyists when building antennas like Yagi and WiFi cantennas, emphasizing the importance of antenna size and tuning to the target frequency for optimal signal performance. It references a webinar by Dr. Jonathan Chisum, highlighting the practical insights beyond textbook theory that can improve antenna design.
Everyone who deals with electronics knows that grounding is important. However, Kristen K6WX » has news: the idea of ground is kind of a myth. She explained at a talk at the recent ARRL National Convention, and if you didn’t make it, you can watch it in the video below.
64:1 balun?
