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
Software Defined Radio technology has revolutionized base station infrastructure, laboratory-grade receivers, and bench equipment for years, yet handheld transceivers have stubbornly clung to traditional fixed-function architectures. The LinHT SDR shatters this paradigm entirely, delivering a genuine software-defined transceiver in a genuinely portable package.
Enter the NanoVNA Test jig Kit, a simple yet powerful “sea of holes” that transforms your VNA from an antenna analyzer into a full-scale laboratory tool for component characterization and RF circuit prototyping.
This article explains the construction, operation, and real-world usage of a 9:1 impedance transformer (UN-UN) for long wire and random wire antennas, making it ideal for SWL listeners and amateur radio operators.
The 3-Element Yagi antenna is a fantastic project for any radio amateur looking for a reliable, high-gain directional antenna that’s surprisingly straightforward to build.
Build a broadband FM Bazooka (sleeve dipole) antenna for 88–108 MHz with low noise, stable impedance, and excellent wideband FM reception. Ideal for DX listening and clear stereo broadcast signals.
Learn how to integrate JTDX with the sBITX SDR transceiver for reliable FT8 digital operation. Step-by-step setup, CAT configuration, and audio interface tips for amateur radio operators
Learn how to build a simple high-gain collinear antenna using coaxial cable for VHF/UHF amateur radio. Low-cost DIY design with improved omnidirectional coverage and better range than a standard vertical
Mini Radio Firmware V3 enhances ATS-Mini DSP receivers with built-in RTTY and CW decoding plus EiBi schedule integration, enabling direct shortwave text decoding and smarter station tuning without external software.
ZBITX is an ultra-portable 5 W all-band HF SDR transceiver with built-in FT8, CW, and digital modes powered by Raspberry Pi. Pocket-sized QRP radio for POTA/SOTA field operation without a laptop.
DIY ESP32-S3 CYD 480×320 FM radio with SI4732 DSP and touchscreen tuning. High-resolution Arduino receiver project with scan and preset features.