Cell Phone History
Cellular Phones
Cell phones have had a longer history then the radio. Back in 1920, the cell phones started and the radios weren’t used until 1921. Of course, some of the features of the cell phone were utilized as far back as the 1940s. Those radios were used by the police.
The idea of the cellular phone was developed in 1947 as a mobile car phone. Bell Laboratories (also known as Bell Labs and formerly known as AT&T Bell Laboratories and Bell Telephone Laboratories) produced the concept of the cellular phone by introducing cells for mobile phone base stations. Russell Ohl developed the photovoltaic cell (a device that converts light energy into electrical energy.) In 1943, Bell developed SIGSALY (also known as the X System, Project X, Ciphony I, and the Green Hornet), the first digital scrambled speech transmission system used in World War II for the highest-level Allied communications. SIGSALY is not an acronym. It was intended to look like an acrynim but it was just a cover name. SIG was common in Army Signal Corps names. The prototype was called Green Hornet because it sounded like a buzzing hornet to anyone trying to eavesdrop on the conversation. Motorola has a long history of making automotive radio, especially two-way radios for taxicabs and police cruisers. The first actual cell phone was invented in 1973 by Martin Cooper of Motorola and other assisting inventors. It was called the “radio telephone system.” He used the idea of the car phone and applied the technology required to make a portable cell phone a reality.
While people were walking on a New York City street in 1973, Cooper made the first portable call on a cell phone. A prototype called Motorola DynaTac was used. Joel Engel was the person he made the call to. From this, the technology and communications market shifted from the place and to the person.
AMPS (Advanced Mobile System) was used and it introduced the first commercial network in Chicago in 1978. Analog as a name the mobile phone was known as. Various digital standards have come into play so there is a less desire for the analog mobile phone in North America.
In 1984 cell phones made its presence to the public but they were very expensive and huge. AT&T and Bell Towers work with the FCC to build towers. There was little power from the towers and they covered a “cell” which covered a few miles in radius. The towers were able to transfer calls from one tower to another.
On a side note, today Cell phone GPS is becoming very popular worldwide.
www.cellphones-mp3.com - Ray Sabo
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