DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
The HF category brings together all content related to high‑frequency bands, from 160 m through 10 m, with emphasis on practical antennas, propagation, and station hardware. Here you will find compact 40 m verticals, multiband wire antennas, HF QRP transmitters, SDR transceivers, and accessories designed for real‑world home and portable operation. Articles often include measured SWR curves, on‑air reports, and build photos so you can understand how a design will behave before you start cutting wire.
There is a strong focus on getting HF on the air from small Indian plots, apartments, and field locations without sacrificing too much performance. Whether you are preparing for your first HF QSO, improving your 40 m NVIS coverage, or chasing DX on higher bands during good conditions, this section provides tested ideas to upgrade your HF station step by step
Developed by Martino Merola, IU8LMC, from the ARI Caserta team in Italy, FT2 is a genuinely operational new digital mode — not vaporware, not a proposal. It was publicly verified on 16 February 2026, with dozens of real QSOs logged on 40m and 80m bands.
FT2 is an emerging weak‑signal amateur radio mode now visible on PSKReporter, offering hams another option next to FT8 and FT4 for HF QSOs and propagation monitoring
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.
The Vigo-Val Miñor Amateur Radio Union from Spain is organizing a historic special event station to commemorate the 114th anniversary of the RMS Titanic tragedy and honor its heroic telegraph operators.
Slow Scan Television is a method of transmitting still images over radio using audio frequency tones. The term “slow scan” distinguishes it from conventional fast-scan television (like broadcast TV), which requires much wider bandwidth.
The Reverse Beacon Network represents one of the most significant technological advances in amateur radio during the past two decades. By providing instant, objective feedback about your transmissions, the system empowers operators to understand their stations better, optimize their performance, and make informed decisions about when and where to operate. Whether you are testing a new antenna, chasing DX, competing in contests, or simply exploring the bands, the RBN adds a dimension of awareness that was previously impossible.
Simple 2N3904 microphone preamplifier for uBITX V3–V6 transceivers that fixes low mic audio and restores full transmit power. Powered from the MIC+ line with adjustable gain for clean, natural SSB modulation.
Build a high gain bi-square antenna for higher HF bands. Get 4dB gain over dipole on 10 meters with detailed calculations, matching solutions, operation tips
Learn how to build a high-performance HF Linear Push-Pull Power Amplifier using affordable IRF510 MOSFETs. This guide includes a full schematic, bias adjustment tips, and transformer winding details for 10-40W output across the HF bands.
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.