DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
The Reception category focuses on pulling weak signals out of the noise using smart antennas, low‑noise front‑ends, and modern SDR tools. It covers topics such as HF broadcast listening, weather satellite reception on 137 MHz, ADS‑B and aircraft tracking, WebSDR resources across India and Asia, and general SWL (shortwave listening) techniques. You’ll find practical antenna designs, preamplifier ideas, and receiver setups that improve copy without requiring huge towers or expensive commercial equipment.
Slow Scan Television (SSTV) is a fascinating mode that allows you to send and receive still images over HF radio using your SSB transceiver. The uBITX and similar homebrew/commercial SSB radios are excellent platforms for SSTV operation. This comprehensive guide will walk you through the complete setup process.
Weather Facsimile—commonly known as WEFAX, HF-FAX, or Radiofax—is easily one of the most rewarding niches in the shortwave hobby. There is a certain “magic” in tuning your receiver to a scheduled frequency and watching a high-resolution synoptic chart or satellite image slowly materialize on your screen, line by line, over several minutes.
Upgrade your Mini Radio Pocket SI4735 experience! The new firmware adds EiBi transmitter data and an eco-friendly power-saving mode for longer listening sessions.
Can’t fit a full-sized 80-meter dipole in your backyard? Or maybe you’re tired of the high noise floor of a vertical? It’s time to look at the Half-Loop. This “open-loop” design provides a fantastic balance between the quiet reception of a loop and the simplicity of a wire antenna.
In this project, we explore a multiband Half-Loop configuration that covers everything from 80 meters down to 15 meters. We’ll discuss the radiation pattern, the importance of a good ground or counterpoise, and how to use a simple tuner to jump between bands. If you’re looking for a “stealthy” antenna that punches above its weight on the low bands, this build is for you. Let’s get that wire in the air!
ADSBee 1090 is an open-source ADS-B receiver that decodes 1090 MHz aircraft transponder signals using RP2040 PIO — a low-power standalone aviation tracker with Wi-Fi data streaming.
The 2N7000 regenerative receiver is a classic single-transistor radio that combines simplicity with surprisingly high sensitivity. By using controlled positive feedback, the circuit operates just below oscillation, dramatically increasing gain and selectivity.
Software Defined Radio technology has revolutionized base station infrastructure, laboratory-grade receivers, and bench equipment for years, yet handheld transceivers have stubbornly clung to traditional fixed-function architectures. The LinHT SDR shatters this paradigm entirely, delivering a genuine software-defined transceiver in a genuinely portable package.
The Hotel Antenna is a clever space-saving vertical antenna design popular among VHF and UHF amateur radio operators. It is especially useful for radio amateurs living in apartments, hostels, or temporary locations where installing large outdoor antennas is not practical.
The double bazooka antenna, often described as a coaxial dipole, is a time-tested antenna design widely used by amateur radio operators. Its popularity comes from a combination of simple construction, predictable impedance behavior, and noticeably lower received noise compared to thin wire dipoles.
Explore ATS Mini, the ESP32-based DSP radio, and ats mini web interface . Learn features, spectrum analyzer, memory control, and setup guide.