DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Master the essentials of amateur radio with the comprehensive guides available at vu3dxr.in. This category offers step-by-step instructions on SDR setup, antenna tuning, and radio operation. From beginner basics to advanced technical configurations, find the practical knowledge and tutorials needed to succeed in your DIY radio projects and communication
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.
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.
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.
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.
This article will give you a complete understanding of NVIS propagation. With the level of technical expertise and detail found in this article, this guide is intended for the amateur radio operator who wants to go beyond the theory and learn the details of NVIS antenna design and operations.
The Extended Lazy-H antenna is one of amateur radio’s classic wire antenna designs, combining simplicity with reliable multiband performance. First published in the October 1955 issue of QST magazine, this antenna was intended to provide efficient HF operation using balanced construction and open-wire feed line.
The ATS Mini series represents one of the most innovative developments in pocket-sized DSP receivers for shortwave enthusiasts and ham radio operators. Built around the Silicon Labs SI4732 DSP chip and ESP32 microcontroller, these tiny radios pack remarkable functionality into an incredibly compact form factor. Let’s explore the technical evolution across all versions, from the original V1 to the latest V4. Built around the Si4732 chip and powered by an ESP32, each iteration has addressed hardware bottlenecks, from audio quality to RF interference
Troubleshooting guide for the LARCSet V3.0 40 m SSB/CW transceiver kit covering common failures, low mic gain, tuning issues, and PA faults. Community-proven fixes and mods from BITX20 builders improve stability, audio, and output power.
Beginner’s guide to FreeDV digital voice on HF using an SSB transceiver, computer, and sound-card interface. Learn setup, operating basics, and how open-source Codec2 delivers clear voice communication under weak-signal conditions