A Several Sentences About History Of Mobile Telecommunications

Mobile phone is the most widely-used present-day discovery among people across the globe

. But only several users may answer who made the earliest cellular telephone, or what laboratory did it. The chief portable phone was invented in the middle of twentieth century by big telecommunication firm. Right that period the corporation AT&T (the company that also offers international phone card), or rather Bell Laboratories, firstly proposed to invent a mobile telephone. In 1947 the suggestion of inventation of cellular telephone was really intrepid, that's why inventors resolved to place first sorts of such telephones in an automobile. It is obvious, because telephone's weight at that time was about 30-40-kg, and it was rather difficult to carry such apparatus. It was major problem of that period, and they started to diminish a cars telephones in 1950. And in 1970 the phones lost much of their weight and their mass was about 12 kilograms, while the power unit still utilized embedded net of an auto . At that period, Motorola was proposed portable radio devices, but they didn't think over mobile phones development. In 1954 Martin Cooper, a new engineer of Motorola, started a new era of compact cellular phones. Martin was just a working man, who was occupied with the design of new portable devices. In 1967 Martin and his department created earliest portable radio expressly ordered by Chicago police department. Having worked in Motorola for 2 decades he took a decision to desing a small cellular telephone. It took them one year to invent project of the first cell telephone. Private firms had to show people modern wireless way of communication, that is why Motorola pressed Federal Communications Commission (FCC) for free frequencies. The proposal of frequencies designation was come across with skepticism, because the experts of Bell Laboratories (one of the widest and famous laboratories in the world) brought into issue the opportunity of invention rather tiny apparatuses in the coming years. However they found a resolution, which was for Motorola to become the company that would introduce the modern networks in. At that time they couldn't guess that in our time we would have phone cards used online international calling card. They fastly began to get ready for the first test program of April 3rd, 1973. On April third, 1973 first transponder was set on the top of Alliance Capital Building in New York City. The first counterpart of BS could support no more than 30 abonents and connect them with telecommunications. They called it Dyna-Tac, it had twelve knobs and its mass was 1.5 kilos. It has no display or any supplementary features. You could communicate with someone for thirty-five min, in case if you charged the phone for no less than 10 hours. In the morn of April, 3rd Cooper used the modern handheld cellular phone to phone the chief of the investigation department of the Bell Laboratories Joel Engel. It was a great success for Martin Cooper and Motorola company. After some period the researchers realized that they created a revolution in the sphere of telecommunications. Nowadays a cell phone has become one of the most widely-used device as well as prepaid phone cards.

by: Robert Owen

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