Aperiodic multiband wire antenna design by HB9KX/DK7ZB: 10.5 m asymmetrical dipole with resistive loading for broadband HF coverage without complex tuning
Author: Prabakaran
Prabakaran is a seasoned author and contributor to leading electronics and communications magazines around the world, having written in publications such as Popular Communications Magazine (USA), ELEKTOR (UK), Monitoring Times (USA), Nuts & Volts (USA), and Electronics For You (India).
Multi Band Capacitor Loaded Shortened Dipole Antenna
Space is often a premium for radio amateurs, but you don’t have to sacrifice performance to enjoy HF bands. The capacitor-loaded shortened dipole antenna, popularized by G7UNF, is a compact, multi-band antenna design that uses a center-mounted adjustable capacitor to tune resonance across several amateur radio bands. This post explains how the antenna works, gives […]
HF Delta Loop Antenna
The delta loop antenna represents one of the most versatile and efficient antenna designs for HF amateur radio operations. This triangular closed-loop antenna configuration offers excellent performance characteristics while maintaining relatively simple construction requirements. Understanding the fundamental principles, design considerations, and performance characteristics of delta loop antennas is essential for amateur radio operators seeking to […]
H.J. Berndt’s Firmware for the ATS-Mini DSP Radio
A deep dive into H.J. Berndt’s alternative firmware for the ATS-Mini. Learn about the new UI, AFC improvements, and how to flash this powerful update to your DSP receiver.
The Simple RF Indicator: A DIY Tool for Detecting RF Signals
The image depicts “Simple RF Indicator,” passive device for detecting radio frequency (RF) signals in coaxial cables. It’s a clever hack using basic components
The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery
GOES-R satellite reception guide — assemble an L-band dish/patch, filtered LNA, and RTL-SDR to capture continuous high-resolution weather imagery without internet
When Satellites Encroach: Ham Radio vs AST SpaceMobile
Ham radio users fear interference as AST SpaceMobile seeks to use the 70 cm band. FCC decision could shape the future of amateur radio
How to Receive Stunning Weather Images from Meteor-M2 Satellites
Learn how to receive high-resolution LRPT weather images from Meteor-M2 satellites using an RTL-SDR, 137 MHz antenna, and SatDump decoder. Complete guide covering pass prediction, signal reception, and image decoding for satellite enthusiasts
The End of NOAA-15 and NOAA-19: What’s Next for Weather Satellite Hobbyists?
NOAA-15 & NOAA-19 shutdown in Aug 2025 ends APT signals. Hobbyists: explore Meteor-M2, GOES, & SDR skills to keep decoding weather satellites data.
Build a DIY Ion Detector: Detect Airborne Ions and Electrostatic Emissions
Build a simple handheld DIY Ion detector circuit using transistors to detect air ions, static discharge, and emissions. Perfect for science electronics projects