There are many ways to build a radio receiver, but most have a few things in common, such as oscillators, tuned circuits, ...

Although ham ... a radio like this and its upgraded firmware, a lot of the capabilities of radios that sell for hundreds of dollars more can be used on a much more inexpensive handheld. All ...

Decades later, the tech has changed; you no longer need to know Morse code, but people are still out there in all kinds ... need it. Ham radio operators use a variety of radio bands to communicate ...