DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
The Tools category brings together both hardware and software that make your radio life easier: audio helpers, shack utilities, measurement aids, and digital tools that support building and operating. You’ll find projects like microphone compressors and RF indicators, along with curated lists of PC and web utilities for circuit design, PCB layout, simulation, logging, and on‑air operating
Common-mode currents are a well-known enemy of clean RF communication. When RF travels along the outside of your coaxial cable, it causes feedline radiation, noise pickup, RFI in the shack, audio distortion, and unpredictable SWR variations. To solve this, radio amateurs typically install a CMC choke (also called a current balun or common-mode filter) at […]
NOAA-15 & NOAA-19 shutdown in Aug 2025 ends APT signals. Hobbyists: explore Meteor-M2, GOES, & SDR skills to keep decoding weather satellites data.
Build a simple handheld DIY Ion detector circuit using transistors to detect air ions, static discharge, and emissions. Perfect for science electronics projects
Learn the difference between OSPI and QSPI flash interfaces in ATS-Mini radios and how to identify your hardware variant. Practical checks using chip markings, PCB traces, and firmware logs to ensure correct firmware flashing.
APRS.Chat is a web-based mailbox for APRS users, storing all your messages even when your radio is offline. Reliable, modern APRS communication.
Learn how to convert a standard AM radio into an SSB receiver using a simple BFO circuit. Step-by-step guide to receiving single sideband signals on your homebrew or vintage radio.
Improve AM signals! Build an active am band antenna with this simple circuit. Boost weak signals with JFET input & multi-stage amplification. Easy DIY
Stop guessing signal strength! Build this easy, low-cost S-Meter circuit to give your homebrew radio a professional visual indicator for incoming signals and tuning.
Learn to build a simple UJT Morse code practice oscillator with basic components. Perfect beginner electronics project for ham radio enthusiasts.
Dead batteries are every electronics enthusiast’s nightmare. Whether it’s a forgotten device left running overnight or equipment accidentally switched on, battery drain can be costly and frustrating. This automatic battery saver circuit offers an elegant solution using the versatile 4060 oscillator and counter IC, providing reliable protection for your battery-powered projects. How the Battery Saver […]