A.C Electricity …and why I hate it!
When I say A.C electricity I mean the kind of high-voltage stuff we have in our homes. So before anybody says: “Well, aren’t radio waves a form of A.C?”, let me explain what I...
Category: Beginners
Lightning and other mishaps
About a year or so ago, I was presented with a Philips transistor radio that according to the owner had been struck by lightning. Fortunately, the lightning strike must have been quite some distance...
The Twelfth Wave Matching Network
Although the mismatch between 50 Ohm and 75 Ohm systems are usually acceptable, it’s easy to obtain a near perfect match using a pair of twelfth wave lines. The nice part is you only...
Velocity Factor of Coax
“The velocity factor (VF), also called wave propagation speed or velocity of propagation, of a transmission medium, is the speed at which a wavefront (of an acoustic signal, for example, or an electromagnetic signal,...
Multimeters for Beginners. Meaning. Using. Short Theory.
Multimeters measure electrical quantities, and will at the very least measure Voltage, Resistance and Current. Usually they will have an AC and DC range. A multimeter is an essential item in any hobby electronics...
Arduino. Serial Communications and Debugging
When a computer program becomes more than a few lines long, or when you need to understand a complicated statement, you need to pause the program and somehow see what it is doing. One...
Six Meters: An Introduction
Six Meters (50-54 MHz) is known as “The Magic Band” to many of its fans, but the best description I ever heard came from a ham I worked during a frantic summer Sporadic-E opening:...
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