DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
The Tools category brings together both hardware and software that make your radio life easier: audio helpers, shack utilities, measurement aids, and digital tools that support building and operating. You’ll find projects like microphone compressors and RF indicators, along with curated lists of PC and web utilities for circuit design, PCB layout, simulation, logging, and on‑air operating
Stop guessing if your quartz crystals are dead or alive! Learn how to build a Simple UJT Crystal Checker circuit to test your components like a pro. This DIY guide includes a full schematic, 2N2646 UJT tips, and step-by-step instructions for quick troubleshooting.
Ready to go on a “Fox Hunt”? Whether you are tracking down a hidden transmitter for a local Ham radio competition or trying to find a mysterious source of RFI in your shack, you need a tool that is more sensitive than a standard field strength meter.
Discover how to build a Logarithmic Audio Compressor circuit for smooth, natural-sounding audio. This guide features a high-performance schematic using precision op-amps and log-antilog transistors to prevent distortion while maintaining consistent signal levels for amateur radio and pro-audio projects.
Learn how to build a simple and effective Audio Clipper Circuit using BC547 transistors and 1N914 diodes. This DIY guide covers schematic details, component selection, and how to prevent overmodulation in amateur radio transmitters for clearer, peak-limited audio.
The circuit Incandescent Lamp Flasher is built around two FETs, which are configured as simple astable multivibrator to alternately switch two lamps on and off.
This crystal tester method lets you confirm a crystal’s “active” status by comparing its output to a known good crystal available
A crystal controlled FM transmitter is a radio frequency (RF) circuit that uses a quartz crystal oscillator to generate a stable, precise frequency for FM radio transmission. Unlike simple LC oscillator circuits, crystal-controlled transmitters offer superior frequency stability and accuracy, making them ideal for applications requiring consistent performance.
Explore alternative firmware options for the ATS-Mini DSP radio, including G8PTN, ESP32-SI4732, and Goshante builds. Unlock enhanced usability, advanced DSP features, and customization beyond the stock firmware
Explore alternative firmware options for the ATS-Mini DSP radio, including G8PTN, ESP32-SI4732, and Goshante builds. Unlock enhanced usability, advanced DSP features, and customization beyond the stock firmware.
Optimise your ATS Mini Radio Wi-Fi, Learn to configure Wi-Fi & download the EiBi shortwave schedule for effortless, updated shortwave listening.