May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
A Practical, 5-Band Homebrew Wire Beam the Upside-Down Umbrella
This page contains a complete course in 39 lessons compiled and made available by Union Royale del Amateurs-emetteurs, where you can find audio files and transcript of all excercises.
A primer on Ham Mesh networks, hams using our radio privileges to operate a private, self-contained wireless computer network
dBm to watts conversion calculator and explaination on how to convert dBm to watts, including dBm to watts conversion table
Windows user-mode application, which allows you to create software virtual serial ports and emulate physical serial ports behavior. It operates exclusively in user-mode, therefore it is more stable and uses less memory, processor and operating system resources than any competitive products.
Online calculator that will convert power entered in milliwatts to dBm. Includes a quick mW to dBm conversion table