receivers and reception

Explores the history of televisions and how they work.

"Donovan and Mark are always giving their friend Alex a hard time. When Alex buys an old TV/VCR at the local antique shop, they tease him about wasting his money. But Alex sees something in it that his friends don't. Then he starts acting strange. Will Donovan and Mark figure out what's going on with him before it's too late?"--Amazon.com.

Gives a short history of radio and explores the many options available for beginning short wave radio listeners.

Outlines the history, invention, and inner workings of television technology and provides full-color photographs, a graphic timeline, and diagrams.