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 ...