Electronics - Lessons

Introduction to NanoVNA: Vector Network Analyzer Basics & Applications The NanoVNA is a compact, portable Vector Network Analyzer (VNA) equipped with a color LCD touchscreen display and a built-in rechargeable battery. It has revolutionized the amateur radio world by bringing laboratory-grade RF measurements to every radio hobbyist's workbench. Photo of the NanoVNA device showing Port CH0, Port CH1, and the touchscreen display 1. Applications and Purpose The NanoVNA is designed for high-precision measurement, tuning, calibration, and diagnostics of various High-Frequency (RF) components and transmission paths: Antennas and Feeders (AFU): Determining resonant frequency, Standing Wave Ratio (SWR / VSWR), active resistance (R), reactive impedance (X), and analyzing phase plots on the Smith Chart. Cables and Transmission Lines: Measuring physical cable length, characteristic impedance, veloci...

CW / MCW Morse Generator: PC Telegraphy Without COM Ports or Soldering Greetings, colleagues! I am pleased to present a new, absolutely free, and lightweight software utility for CW operation directly from a computer — the CW / MCW Morse Generator . The days of classic legacy programs (like the legendary CwTyp ) are fading away, as modern laptops no longer feature physical COM or LPT ports, and operating systems like Windows 11 and Linux demand new software solutions. Built completely from scratch, this utility runs lightning-fast, requires no heavy frameworks or installation, and works "out of the box" on 64-bit Windows and Linux systems. 1. Who Is This Program For? For beginner radio amateurs: those who are not yet confident operating a straight key or a paddle, but want to conduct telegraph (CW) QSOs. For handheld VHF/FM operators: wanting to transmit Modulated Continuous Wave (MCW) or tone telegraphy. F...

How to Learn CW (Morse Code)? A Practical Guide In amateur radio, the process of learning Morse code (CW) can be broken down into five main stages: Learning the Basics: Memorizing the characters by their rhythmic sounds (dits and dahs) rather than visual dots and dashes, starting at a slow speed. Receiving Practice: Training your ear to copy CW at an average speed of 12 WPM (Words Per Minute), gradually increasing to 20 WPM. This is also the stage for your first attempts at sending with a key. Plain Text Practice: Sending and receiving free-form text on HF or VHF bands — practicing real-world "rag-chewing" (casual conversation) with a friend using CW. Learning the QSO Template: Mastering standard amateur radio slang and Q-codes by listening to recorded QSOs or live on-air exchanges (e.g., GA OM... ). Making Live QSOs: Getting on the air and conducting actual CW contacts with other hams on the HF bands ...

Basics of Quality Soldering. How to Learn to Solder Basics of Soldering Various Soldering Methods Soldering Printed Circuit Boards Enameled Wire Connection Technique Basics of Soldering The first thing you need to do is prepare everything necessary for soldering electronic components: a soldering iron, a soldering iron stand, a wooden block, solder, flux, pliers or tweezers, and wire cutters. Before soldering, the soldering iron must be prepared. To do this, use a file to shape the tip of the soldering iron at a 45-degree angle ( this is especially true for a new soldering iron, as the anti-burn coating on a new tip prevents tinning and, consequently, picking up solder ). After cleaning the tip, plug the soldering iron into the mains. When it heats up to the melting point of the solder, slightly process the tip with the file once more until the working part shines, and immediately touch the flux a...

THE ABCs OF SHORTWAVE (SW) RADIO From the moment radio was invented up to the present day, its primary application has been the transmission of information from one point to another — radio communication. The possibility of using radio waves to transmit messages over a distance was first demonstrated in 1896 by the inventor of radio, A. S. Popov. And although the world's first radiogram consisted of only two words ("Heinrich Hertz") and covered a distance of 250 meters, the foundation was laid. Radio communication quickly gained widespread acceptance. Radio stations appeared on ground facilities and ships, on aircraft, and on spacecraft. Radio penetrated military affairs and firmly entered everyday life. The tremendous popularity of radio was largely promoted by enthusiastic amateurs who selflessly devoted their time and energy to experiments. One of the first radio amateurs in Russia was the famous Russian scientist M. A. Bonch-Bruevich. Back in 1906, he bui...