how it works

# how it works - WHY STUDY THIS STUFF To be able to...

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WHY STUDY THIS STUFF? To be able to understand current issues, such as: HDTV FCC DECISIONS (Low power FM) Convergence of media

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HOW IT WORKS RADIO WAVES are an invisible form of electromagnetic energy. There are many kinds of electromagnetic energy -- light, for example, is a visible form. We all know light travels faster than sound, so how can they both be the same kind of electromagnetic energy? Because we’re talking about radio waves, not “radio” in the ordinary sense.
HOW IT WORKS ELECTROMAGNETIC ENERGY : Radiates outward from a source without a physical vehicle. Travels at the speed of light. Assumes the properties of waves.

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SOME BASIC TERMS FREQUENCY : Number of waves (cycles) per second. Unit of measurement is Hertz. (Hz) WAVELENGTH: Distance from top of one wave to top of the next. Frequency and wavelength are INVERSLY related. In other words, the higher the frequency, the shorter the wavelength and vice versa.
REMEMBER METRICS ? Kilo = 1,000 (1 kHz is 1,000 Hz) Mega = 1,000,000 (1 MHz is 1 million Hz) Giga = 1,000,000,000 (1 GHz is 1 billion Hz) Hey - No one told me this was a Math class!

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ELECTROMAGNETIC SPECTRUM What the heck? Look at page 89 of text. Audible electromagnetic energy ranges from 20 hertz to 20,000 hertz (20 kHz) But look where we broadcast. How is that possible?
CARRIER WAVES The sound you hear coming out of your radio or television is transmitted on a “carrier wave.” In other words, sound

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how it works - WHY STUDY THIS STUFF To be able to...

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