Johnson's Techworld

Homebrewing of My First VHF Seven Element Yagi Begins! I have not homebrewed any antenna for the past 35 years. Beyond that, I had first made an inverted

Can Solar Panels Cause Electromagnetic Interference? Just read on Twitter that one Ham Radio operator elsewhere was quite worried when his neighbour was installing solar panels as the

Know Your Coaxial Cable Well! Coaxial cable is the most common feedline used to connect amateur radio to the antenna. Coaxial cable consists of an inner conductor surrounded

Can You See Satellites in the Sky? Satellites are quite tiny compared to the other celestial objects in the sky. Still, they can be visible in a clear

How Does a Yagi-Uda Antenna Work? Yagi-Uda antenna is very popular in Amateur Radio or Ham Radio. It was also a common sight on housetops before the era

What is Turnstile Antenna? Turnstile antenna is also known as crossed-dipole antenna as it consists of two identical dipole antennas mounted at right angles to each other. Currents

അമേച്വർ റേഡിയോയിലെ ഡെൽറ്റ ലൂപ്പ് ആന്റിന എന്താണ്? (Delta Loop Antenna) ഗ്രീക്ക് അക്ഷരമായ ഡെൽറ്റയുടെ (Δ) ആകൃതിയിലുള്ള ഫുൾ വേവ് ആന്റിനയാണ് ഡെൽറ്റ ലൂപ്പ് ആന്റിന. ആന്റിന ഒരു സമഭുജ ത്രികോണം പോലെ Δ ആകൃതിയിലാണ്. മുകളിലോ

What is a Horn Antenna? Horn antennas are used mainly for UHF and microwave frequencies. It consists of a flaring metal wave guide shaped like a horn, to

What are dB, dBi, dBd, and dBm Gains in Amateur Radio? Decibel is a unit which most of us are familiar in case of intensity of sound. It

Can You Use D-Star Amateur Radio in Android Phone? D-STAR stands for Digital Smart Technologies for Amateur Radio, a digital voice and data protocol specification for amateur radio