Spectator N0. 2679 : Choc-A-Block By Doc
Crosswords1 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Citizens Band radios convert power (often from a battery) into electromagnet waves (like visible light but lower in frequency) of a selected frequency band (like red or green or blue, but at a lower frequency). The waves are modulated (varied) by the signal from a microphone.
These waves are received and the desired frequency band is selected. The modulation in the wave is detected, amplified (magnified) and delivered to a speaker.