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
The Khanfar Spectrum Analyzer project has quietly grown into one of the more capable free SDR software suites available for Windows. This post walks through the full tool collection — from the flagship analyzer to CFAR-based signal detection and multi-SDR direction finding
While Meshtastic has long dominated the LoRa scene, MeshCore has emerged as a serious contender for structured, infrastructure-based communication. Here is how they stack up for the modern ham.
Analog FM is hitting its limits. Enter DRM+, the open-standard digital revolution that brings CD-quality audio, multimedia data, and emergency alerts to the 88–108 MHz band. Explore the technology and global adoption of 2026.
Imagine a digital network where every radio node talks to others, passing messages automatically without the internet. That’s Meshcore. This post explains how ham operators can use cheap LoRa boards to build resilient, local data links for texting and telemetry.
Meshtastic is an open-source LoRa mesh networking platform that lets ham radio operators build off-grid text messaging and GPS tracking networks with no infrastructure. Whether you are an experimenter, an emergency communications volunteer, or simply curious about where digital modes are heading, this guide covers everything you need to know to get started with Meshtastic ham radio.
Software Defined Radios have made high-performance spectrum analysis accessible to anyone with a laptop and $30 to spare. This guide covers every worthwhile SDR from cheap RTL dongles to dedicated HF receivers — with software picks, antenna advice, and practical projects to get you on the air fast.
Every vessel larger than 300 gross tons is legally required to broadcast its identity, position, speed, and heading every few seconds on VHF radio. With a $25 RTL-SDR dongle and free software, you can receive, decode, and map those live transmissions from your living room — no licence required, no nautical background needed. This guide walks you through the AIS standard, the hardware and software stack, antenna options, and how to contribute your decoded data to global ship-tracking networks.
It took just one night — February 16, 2026, 22:47 UTC — for a small group of Italian radio amateurs to change the digital HF landscape forever. FT2, developed by Martino Merola IU8LMC of ARI Caserta, compresses a full ham radio QSO to as little as seven seconds, running four times faster than FT8 and twice as fast as FT4. Within two weeks, it had been spotted on PSKReporter from dozens of countries, spawned two incompatible software implementations, and ignited a fierce debate about open-source ethics, automation, and the soul of amateur radio digital operating. This is the complete story of FT2 — the mode, the schism, and what comes next.
Discover the science behind Sporadic E propagation — the ionospheric phenomenon that lets FM radio signals travel 2,000+ km. Includes antenna tips, best seasons, monitoring tools, and DX listening tricks
The Baofeng UV-5R Mini brings USB-C charging and Bluetooth to the classic UV-5R platform. While it excels in portability, it faces significant hurdles in Airband reception and UI quirks.