DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
This micro power AM transmitter uses a crystal-controlled oscillator and a 2N2222 transistor stage to generate a stable RF carrier, then modulates it with audio input. A tuned tank circuit and variable capacitor optimize output, enabling low-power short-range broadcasting for experimentation and learning
This article explains how the HydraSDR RFOne enters the SDR market as a direct competitor to the Airspy R2, offering similar core performance with a few key differences.
It highlights a wide frequency range (24 MHz–1.8 GHz), 12-bit ADC, and up to 10 MSPS sampling, making it suitable for spectrum analysis and amateur radio use. The main differentiator is its open-source firmware, which allows customization and community-driven development
NOAA-15 & NOAA-19 shutdown in Aug 2025 ends APT signals. Hobbyists: explore Meteor-M2, GOES, & SDR skills to keep decoding weather satellites data.
Explore MSI-SDR — a budget wideband SDR receiver with 12-bit ADC, up to 8 MHz bandwidth, and multi-band inputs, offering hobbyists a cheap entry into RF spectrum analysis
This guide explains terminated antennas for HF ham radio, which use resistors to absorb reflected energy and maintain stable impedance across wide frequency ranges. It covers designs like Beverage and T2FD antennas, highlighting their broadband performance, directional patterns, and suitability for multiband, low-noise, and space-restricted installations.
From a fellow ham radio enthusiast, I recently acquired a refurbished Dell OptiPlex 980. My plan is to turn this vintage desktop into a dedicated machine for amateur digital operations like FT8, a task that doesn’t demand cutting-edge hardware but certainly benefits from stable performance. The system arrived with Windows 7 Pro 64-bit pre-installed, which […]
This article explains a terminated mini loop antenna designed for small spaces, combining loop geometry with resistive termination to achieve directional reception and reduced noise. It covers construction using wire, a terminating resistor, and a matching transformer, delivering wideband HF performance without a tuner for compact installations.
The uBITX V6.1 is a popular amateur radio transceiver kit. It’s designed for ham radio operators who enjoy building their own equipment. Moreover, it offers great value for money and covers multiple frequency bands. However, like many DIY kits, it sometimes needs tweaking to perform at its best. uBITX V6.1 – My Audio Problem Story […]