What is Dynamic Range?
What is the Dynamic Range of a Receiver? Since the term dynamic range is often used when discussing the performance of a receiver, it is important to clearly understand what it refers to and its […]
Selectivity and Sensitivity in NBFM Receivers: Fundamental Performance Parameters
Selectivity and Sensitivity in NBFM Receivers: Fundamental Performance Parameters In the context of wireless communications, the quality and performance of a receiver are crucial factors that determine the reliability and efficiency of a system. In […]
Exploring the Caged Hen-Delta Antenna: Unlocking Big DX from Small Spaces
Exploring the Caged Hen-Delta Antenna Unlocking Big DX from Small Spaces Introduction Amateur radio often rewards those willing to explore less-traveled paths. The 6-band, 6m-20m Caged Hen-Delta antenna is one such path — a hidden […]
Introduction to the Decibel – what actually is a dB?
Introduction to the Decibel (dB) The definition of the bel was derived from measurements in telephony on the Bell system in the United States in the early 20th century. The bel (B) was named in […]
About Noise – plainly simple and easy to understand
About Noise An attempt to describe, for fellow radio amateurs, the nature, types and characteristics of noise in a simple and understandable way, avoiding the use of mathematical relationships and formulas Noise in telecommunication systems […]
How To Build a Rotator Controller with a Computer Interface
The Problem Very often we have seen a rotator control interface for a computer. They are usually quite expensive and we convince ourselves that we do not need it. Only those who have used it, […]
Ham Radio Bandplan for SDR#
Most people and ham radio colleagues who have been using SDR Receivers already know, and probably are familiar, with SDR SHARP – SDR# software [1]. It is one of the most capable and professional software […]
What’s the best wire for a dipole? (video)
By Ian VK3BUF – Published in the September 2021 Edition of QTC As long as radio has existed there have been wire antennas. These have been made from a diverse range of conductive materials. Often […]
How Tough Are Ferrites? (video)
By Ian Jackson VK3BUF. The original article was published in QTC January-March 2021. Earlier in 2020 QRM Guru published an article to answer a few common questions on ferrite materials. It looked at budget versus […]
TEN Easy Steps To Etch Your Own Quality Circuit Board – PCB (video)
Many of us have tried to make our own board for our favorite project. Unfortunately, most do not get the desired results. Usually, our board will need a lot of work to become functional. We’ll […]