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How I would like to change the cell phone industry [was AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency]
"Jeff Liebermann" wrote in message ... I'll make it really simple for you. FM is "hi-fi", while AM is noisy "no-fi". Don't you want to be cool strutting down the street with your iPhone watching HDTV with 7.1 sound? It wouldn't do to have it sound like the typical AM broadcast station. For decent quality, you gotta have FM. FM is not inherently any more 'hi-fi' than AM. Fidelity is a product of bandwidth, not modulation type. AM is not even so susceptible to noise as the frequency goes up, since the energy of the noise pulses goes down logarithmically as frequency goes up. AM is used for aeronautical communications very successfully for several reasons, one of which is the LACK of 'capture effect'. There are still some frequencies where AM will be more susceptible to interference than FM, but FM would still suffer, for instance the segment between 1330-1400 MHz which is the natural frequency of Hydrogen (lots of that around). |
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