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July 18th 07, 01:05 AM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
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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]
On Jul 16, 7:36 pm, "Brenda Ann" wrote:
Analog satellite still uses FM, but there is very little of that left. 30MHz wide channels. Think there used to be one version of SECAM (in France, IIRC) that used FM video. That's gone now, too. Actually SECAM also uses AM for the luminance signal. However, it uses FM for the color [chroma] signal. |
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