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From @ScienceTip on Twitter:

AM radio is analogous to sending messages with a flashlight by varying the brightness of the light.

FM radio is analogous to sending messages with a flashlight by varying the color of the light.
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7 comments
 
Makes sense. I've always know that AM and FM stood for Amplitude Modulation and Frequency Modulation, respectively, but I never made the connection with the visible band of the EMS. Interesting!
 
Digital radio is analogous to sending messages with a flashlight by turning the light on and off with morse code. 

I'm trying to come up with an analogy for streaming radio, but am stumped.
 
Updated: I accidentally said "SciPyTip" but should have said "ScienceTip."
 
Yeah, but what if you varied the speed of light?
 
Oooh! I bet nobody has tried that ...
 
+Harlan Harris Streaming radio is like throwing away the flashlight and using telegraph instead.
 
If you want to stream radio, you may have to consider QAM modulation. In other words, you will have to vary the brightness of two flashlights at a time (and hold them at right angles to one another). Never heard of QAM radio though :-)
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