Saturday, October 16, 2010

History of mobile

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The phones have the heart of communication for many years. Telephone was invented by Alexander Graham Bell after a lot of trial and error in 1870. Invention of the telephone, as it is now called, began with the electrical transmission of speech. Telegraph and telephone wire, both electronic systems. Telephone was the result of the efforts of Mr. Bell to perfect the telegraph. This was much in demand as a voice communication possible between two individuals. It 'been a shamePhenomenon and people have criticized as much as they accept it.

Mobile phones were large equipment and stationery, and could only communication between particular groups of individuals. Since then, the phones were improvised and made to look attractive, elegant and are a handy device. Engineers used light and resistant materials in an effort to make mobile phones to portable and efficient. In 1950, mobile phones are very efficient and were not so bulky.

ALady named Teri Pall invented the cordless phone in 1965. It was a jazz singer by profession and came free with the idea to remove the wiring and the wire of the receiver. Such a cordless phone worked at a low frequency of 47-49 MHz and it worked well in small areas. is the advanced versions of high frequency cordless phones are able to function properly in large environments. Efficiency of mobile phones at high frequency is better than that of mobile low-certainly better than beforedifficult to intervene in the discussions.

FCC, Federal Communications Commission has issued or allowed companies to 900 MHz frequency phones only do up to 1994. This step by the government triggered an increase in demand for cordless phones. Frequency of 900 MHz was ideal for scrap static caused by walls, equipment, and interference in the signals from other objects. They have provided high-quality audio output, but they are still vulnerable to eavesdropping. To explore the safety, FCCallowed manufacturers to make phones with a frequency of 2.4 GHz and 5.8 GHz

These are guaranteed wireless phones and can be interrupted by any radio scanner. high-end cordless phones designed especially taking into account the confidentiality of the talks.


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