DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Explore technical amateur radio projects and DIY guides at VU3DXR. Discover tutorials on RF circuits, receiver mods, and digital modes. Start building today
On the day Israel and the United States launched their first strikes against Iran, a mysterious shortwave radio station flickered to life on 7910 kHz. It hasn’t gone silent since. Broadcasting streams of numbers in Farsi — a Cold War spy radio technique that was thought to be fading from use — the signal has now been logged from Europe to North America. Radio amateurs have given it a name: V32
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.
On the evening of 3 October 2025, radio listeners across Tamil Nadu were pleasantly surprised: broadcasts soon resumed on the Medium Wave frequency 1548 kHz using the high-power transmitter in Trincomalee, Sri Lanka — the same facility that formerly belonged to Deutsche Welle (DW). What We Know The test broadcast started at 8:00 PM IST […]
Learn how to build a compact, high-sensitivity Miniature FM Transmitter with this DIY electronics guide. Featuring a simple transistor-based schematic and an electret microphone, this project is perfect for beginners exploring RF circuits and wireless audio.
Do you love electronics and want a fun, beginner-friendly project? Build a two transistor radio! This classic DIY project, featuring simple components, gained popularity years ago and still teaches radio technology effectively. Let’s explore how you can create your own two transistor radio easily. What is a Reflex Circuit? A reflex circuit cleverly reuses one […]
Maximize performance with minimal parts! Discover how the reflex circuit “recycles” its transistor to boost signal strength, making it the perfect DIY project for radio experimenters.
Discover the magic of “no-power” radio! Step-by-step instructions on building a crystal set that runs entirely on the energy of the radio waves it receives.
In-depth review of the LILYGO T-Embed ESP32-S3 SI4732 multiband DSP radio covering hardware architecture, reception performance, firmware ecosystem, and real-world usability for makers, SWL, and ham radio enthusiasts.
Solar cells can easily provide enough power to operate a small radio receiver. This DIY Solar Powered Radio project is an ideal set to take away on holiday. It covers the medium wave (AM) waveband, so why not laze on the beach this summer and listen to your favourite station. But first, let’s get busy with […]
ATS-20 is a compact SI4732-based multiband DSP receiver covering FM, MW, SW, and SSB — a highly sensitive portable radio with external antenna support and mod-friendly firmware