Thursday, May 05, 2005

How Cell Phones Work - latest cell phones

A cell phone is nothing more than a sophisticated radio. A good way to understand the sophistication of a cell phone is to compare it to a CB radio. A CB radio is a simplex device. A simplex device is one in which two people communicate on the same frequency, so only one person can talk at a time. A cell phone is a duplex device, so it uses one frequency for talking, and a second separate frequen

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