Oct 14, 2016
Technology the ultimate equlizer of the rich and the poor

Cell phones are interesting, useful and play a major role in our lives by bringing people closer together and keeping in constant touch with one another. However, most people do not understand the physics of a cell phone.

Cell phones are defined as type of wireless communication device or may be as sophisticated radios. They use many small cells with a base station and a cell phone tower at the centre of each cell. These cells have extensive frequencies that allow thousands of people to use cell phones at the same time. In this process, cellular calls are transferred from base station to base station as a user travels from cell to cell.

Advantages of Cell Phones

The cell phone is a wonderful invention and there are several advantages to cell phones. Cell phones have played a vital role in bringing the world closer together. Indeed, it is an added resource that gives it user's great advantages.

One notable advantage of cell phones is that it allows its users the advantage of a wider opportunity to communicate by a principle call frequency reuse. Through this principle the same frequency can be used by different cells without creating interference from other cells. Frequency can be used over and over. A second advantage of cell phones is that they are small and easy to carry around.

Cell phones have full duplex, meaning that you can use one frequency for talking and a second frequency, separate frequency for listening. Both people on a cell phone can talk at once. The cell phone can communicate on 1,664 channels or more. In addition, cell phones (TDMA) use a dual band. This means that it can operate in both 800 MHz and 1900 MHz bands.

Cell phones have great influence in our everyday life and are convenient to have around. Cell phones are a faster and more effective way to transfer information.

Disadvantages of Cell Phones

Sometimes cell phone calls in an area of tall buildings have a great deal of interference and dropped signals. The reason behind this is that radio signals from the cell phones and towers all reflect back and forth between buildings around us. There echoes almost overlap at the antennas, but vary on points on the wave form from each reflection caused by the differing lengths the waves travel and the effect of reflection of various surfaces. This cause a great drop in signal strength and clarity and the signal may be dropped.

There are medical reasons to suspect that cell phone may cause cancer of the ear or brain tumors. The more individuals use cell phones and the greater the number of years used by them, the greater the risk of brain tumors. However, the mobile phone industry has long resisted any suggestion of a link to cancer, though it accepts that mobile phone radiation does affect the electrical activity in the brain




Posted at 11:02 am by samsolong

 

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