How Cell Phones WorkWritten by Levetta Rivera
Each day thousands of people in United States purchase cellular phones. At that rate it is likely that someone you know owns a cell phone and uses it on a regular basis. They are such great gadgets - and there are a ton of cool cell phone accessories you can buy to make yours stand out from crowd. With a cell phone you can talk to almost anyone from just about anywhere, because approximately 80% of U.S. has coverage. Cell phones have come a long way in a relatively short period of time but have you ever wondered exactly how a cell phone works? A cell phone is nothing more than a sophisticated radio. A good way to understand 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 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 frequency for listening. A CB radio has 40 channels. A cell phone can communicate on 1,664 channels. Cell phones also operate within cells and they can switch cells as they move around. Cells give cell phones incredible range. A CB radio can transmit about 5 miles. Someone using a cell phone, on other hand, can drive clear across a city and maintain a conversation entire time. Cells are what give a cell phone its incredible range. Cellular phone system technology is amazing in that a city can be chopped up into small cells that can allow extensive frequency re-use across a city. Frequency re-use is what lets millions of people own cell phones without problems. It works because carrier chops up an area to about 10 square miles.
| | The Cellular Phone ExplosionWritten by Levetta Rivera
Cellular phones are big business in United States and abroad. More than 30,000 people sign up for and start using a cellular phone every day. It's nothing short of amazing how this industry has exploded in such a short period of time. Consumers can't seem to live without their cell phones and cool accessory gadgets that go with them. As a result wireless communications companies and retailers are raking in dough as consumers gobble up these sophisticated devices.Cellular phones are nothing more than sophisticated radios. A cell phone is
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