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Consumer Electronics by S. P. Bali

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TYPES OF MOBILE PHONES

There are basically three different types of mobile phones for use with a cellular network: fixed carphones, which are permanently attached to the car; portable phones, which can be used in the car or outside, and personal pocket phones. The difference between the three types of phones concerns their power output and the size of the cell in which they can operate effectively.

Most in-built car phones and many transportables have a power output of between 6 and 10 watts and therefore can operate in large cells. The power output regulates the strength of the signal the phone can send back to the base station. The farther away the base station, the stronger the signal needs to be; this is also affected by the size of the antenna. ...

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