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How Data on electromagnetic waves are transmitted ?

by dailydc
Tags: data, electromagnetic, transmitted, waves
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Aug7-11, 06:45 PM
P: 11
Hello every one .
We know Radio waves carrying data
When a radio device receives radio waves , It render the waves and we hear sound .

Now my questions are :
1 - How data on electromagnetic waves are transmitted ?

When a electromagnetic wave hit a atom it absorbed by the atom
like this

Then after a short delay another photon is emitted .

2 - What happens to the data at this moment ?

3 - What's the data ? are they atoms ? are they electrons ? are they Community atoms ? or ...... ?
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Aug7-11, 08:15 PM
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ZapperZ's Avatar
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Er.. you have a wrong idea on basic E&M, especially on antenna.

Since EM waves (photons) have oscillating E-field, I can detect such waves simply with an antenna. That's what your radio does. One can naively think of it as the oscillating E-field inducing current in an antenna. This current is the transmitted signal. What you are receiving is not due to some atomic excitation.

Aug7-11, 11:49 PM
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To find out how sound information is sent by radio, search about "amplitude modulation" or "frequency modulation", better known as AM and FM.

Aug8-11, 12:29 AM
P: 9
How Data on electromagnetic waves are transmitted ?

One could almost think of an old player piano where little bumps at different places make different sounds. You could think of different amplitudes or wavelengths as changing the location of the bump on the roll.
Aug8-11, 06:25 PM
Drakkith's Avatar
P: 12,005
Look up antenna, AM and FM radio, electromagnetic radiation, and other similar items on wikipedia. That will explain pretty much everything about this.

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