When we think of a spark gap radio transmitter, most of us immediately imagine an early twentieth century ship’s radio room or similar. Most of us know these transmitters as the first radio systems, ...

When one thinks of portable consumer electronics that are now largely obsolete, portable CD players, minidisc players, and portable cassette tape players are products that immediately come to mind.

CB radios were — and still often are — a practical tool on the road, especially in a trucker’s life. But back in the 1970s and ’80s these portable communication devices were at the heart of a ...

In these high-tech times, there are about a million gadgets, gizmos and thingamajigs that kids beg their parents to buy. And companies use just as many methods to market these products. But if ...