Quezi

If you’ve ever tuned across the AM radio band late at night, chances are you’ve heard radio stations from far away that you can’t hear during the daytime. What’s happening is that the radio signals are bouncing off the ionosphere, an area in the upper reaches of the atmosphere where ultraviolet light from the sun [more...]

Morse code, developed by Samuel Morse in the 1840s, is still used by thousands (probably hundreds of thousands) of people worldwide. Foremost amongst those are radio hams (amateur radio operators) who until recently were required to pass a Morse code exam before gaining their license. In some countries, the Morse test is still needed. The [more...]