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#1
July 15th 07, 09:56 PM
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]
wrote in message ... Cell phones already use frequencies in the 3 GHz region. Really? Which ones? I'm only aware of cell systems using 800, 900, 1800 and 1900 MHz. There are some (very few) multisystem phones that use all four of those ranges. |
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#2
July 15th 07, 10:31 PM
posted to sci.electronics.basics,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 15, 1:56 pm, "Brenda Ann" wrote:
wrote in message ... Cell phones already use frequencies in the 3 GHz region. Really? Which ones? I'm only aware of cell systems using 800, 900, 1800 and 1900 MHz. There are some (very few) multisystem phones that use all four of those ranges. .. . . |
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#3
July 15th 07, 10:45 PM
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]
In rec.radio.amateur.antenna Brenda Ann wrote:
wrote in message ... Cell phones already use frequencies in the 3 GHz region. Really? Which ones? I'm only aware of cell systems using 800, 900, 1800 and 1900 MHz. There are some (very few) multisystem phones that use all four of those ranges. Notice the word "region"? -- Jim Pennino Remove .spam.sux to reply. |
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