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How Cell Phones Work
Beginning of essay
Each day about 30,000 people in the United States sign up for and start using a cellular phone. Therefore it is likely that you or someone you know has a cell phone and uses it on a regular basis. They are such great gadgets - with a cell phone you can talk to almost anyone from just about anywher ....
Middle of essay
....rks because the carrier chops up an area to about 10 square miles (Dang).
In the dark ages before cell phones, people used radiotelephones in their cars. In the radiotelephone system there was one central antenna tower per city and perhaps 25 channels available on that tower. This central antenna meant that the phone in your car needed a powerful transmitter - big enough to transmit 40 or 50 miles. It also meant that not many people could use radiotelephones - there just were not enough channels.... |
| Number of words: 999 |
Approximate pages: 4 |
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