. . . 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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