DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
This shortened EFHW antenna covers 80m through 10m using a 49:1 transformer, 110µH loading coil, and RF choke. Ideal for small spaces and portable HF setups, the design delivers low SWR, easy installation, and reliable multiband performance for amateur radio operators seeking a compact antenna solution.
The VHF slingshot antenna is a compact and efficient design ideal for reliable signal transmission and reception. With a balanced structure and simple coaxial feed, it offers strong performance while remaining easy to build, making it a practical choice for hobbyists and radio enthusiasts working in the VHF frequency range.
Discover how to build a reliable 3-band antenna for 40m, 20m, and 10m. This simplified DL1BU modification uses an asymmetrical dipole and a toroid balun to deliver exceptional SWR performance using standard coaxial cable for your amateur radio station.
The Multiband City Windom is a compact, end-fed wire antenna purpose-built for urban amateur radio operators. With a 26-metre radiating element, a 13-metre RG-58 feedline section, a 1:4 impedance transformer, and a common-mode choke, it delivers reliable multiband HF performance without demanding a complex ground system or an ATU on most bands.
The zBitx v2 update introduces a high-performance Wi-Fi architecture and fixes receiver “chuffing,” but v1 owners face “white screen” and voltage hurdles. This guide covers the essential SD card setup, the 9V power requirement, touchscreen calibration tricks, and the critical Pico vs. Pico W hardware check for a successful upgrade
Welcome to Radio Waves Weekly — Issue #014! This week the focus shifts to the bench and the junk box. Four homebrew and shack project archives worth bookmarking, two dual-band Yagi builds you can start this weekend, a compact balcony SDR station for under €150, and a practical beginner guide to getting your first signals on screen.
Shifting Meshtastic to the 433 MHz amateur band offers superior range and higher power limits. This deep-dive guide explores how licensed hams can legally build high-performance mesh networks while staying compliant with international radio regulations.
Ashhar Farhan has officially unveiled the zBitx v2, a significant leap forward for the compact SDR transceiver. With upgraded hardware including a passive FET mixer and a game-changing Wi-Fi-based front-panel connection, the v2 fixes legacy bugs while paving the way for custom user interfaces.
Tired of lost packets and weak signals in your ADS-B setup? STREAM1090 introduces a paradigm shift in demodulation, moving away from fragile preamble detection to a robust, CRC-validated bit-streaming approach that extracts more data from the noise.
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