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week 9

 

Cell phones use radio frequencies to send and receive information that is translated into sound. At any given time while in use, the cell phone sends information on at least two different frequencies, one for sending information and one for receiving it. Signals carrying voice, text, and digital data are transmitted via radio waves from one device to another. The typical cell phone includes a dual-strength transmitter, capable of transmitting either 0.6-watt or 3-watt signals.

 

    A cellphone handset contains a radio transmitter, for sending radio signals onward from the phone, and a radio receiver, for receiving incoming signals from other phones. The radio transmitter and receiver are not very high-powered, which means cell phones cannot send signals very far.

Cellular networks are distributed over land areas called cells, each served by at least one fixed-location transceiver (typically three cell sites or base transceiver stations). These base stations provide the cell with the network coverage which can be used for transmission of voice and data.

 

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