Cell Phone History - The Evolution of the Cell Phone

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Cell Phone History - The Evolution of the Cell Phone


Cell phones have become a part of mainstream culture. Recently they have become more affordable and accomplish much more than making and receiving calls. Along with the growing popularity there is also growing concerns about safety and health. In this paper we will address cell phone history and how they have evolved. We will discuss health concerns such as tumors and talking while driving. Finally, we will talk about all of the technology that cell phones can accomplish such as receiving Email and buying stocks.

History:

In 1921 the Detroit Michigan Police Department first used mobile radio in a vehicle. Digital wireless and cellular roots started in the 1940s. In the 1940s new frequencies between 30 and 40 MHz were available. There was an increase of availability in channels which police systems were encouraged to use. Mobile units were available within private companies, individuals, and public agencies. In St. Louis, 1945 the first mobile telephone system in the US was introduced. Along the highway between New York and Boston a Public mobile system carried greater frequency distance in 1947. In 1n 1949, the FFC authorized separate radio channels to common carriers. A new system was developed with automatic channel selection in 1964. With this new system each call allowed customers to dial for themselves and it eliminated the need to push-to-talk operation. In 1975, in Chicago, AT&T was authorized to develop a cellular system. After this AT&T and Bell labs work with other cellular vendors to develop their cellular phones. Their phones were made so consumers would have the quality products available to use on cellular networks. There are many reasons why the mobile wireless has not progressed further in the last 60 years, this is because of cautiousness and federal regulation. The Federal Communications Commission controlled frequency availability. Their regulations and unresponsiveness had the most significant factors hindering radiotelephone development. The Federal Communication Commission delayed the technology in America by ten years.

Health:

Brain tumors and eye cancer are two health concerns of cell phones that are currently under investigation. Many people have heard rumors about whether or not cell phones are responsible for these health problems, but answers never seem to be found.

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Related Searches




Researchers have recently conducted a study to find out if brain tumors were related to cell phone use. The researchers did not find a direct link with the brain tumors and cell phones. Although studies are still taking place to find out for sure, the conclusion seems to be that cell phones do not cause brain tumors. As for eye cancer, scientist have found that people who use cell phones regularly are three times more likely to develop eye cancer. This study is also still under investigation but many facts lead to the conclusion that cell phones do increase a persons risk of developing eye cancer.

RF Power Deposition From A PCS Cell Phone Inside Your Head.
Colors varying from blue to red illustrate the SAR when the phone is placed against the head. The power is in dB and is relative to the point of the model where the maximum SAR occurs. In this case, the head.

Driving while talking on a cell phone seems to be more dangerous than any of the diseases cell phones are accused of causing. Many states are banning the use of cell phones while driving. New York became the first state to ban cell phones while driving and many states are expected to follow.

Technology:


Cellular technology is a fairly new technology. Since its invention in 1968 it has greatly improved. Cellular technology was developed to take care of the frequencies that were being transmitted over the airways. The FCC turned to the telephone companies to come up with a solution to the problem and AT&T came up with a feasible solution. They suggested that a system of towers or beacons be created. Each tower would carry a certain frequency for a certain radius. However, the signal or frequency could be used by different users simultaneously. As the person trying to make the cellular call leaves the radius of that tower, another tower picks up the signal and changes the frequency of the call. Thus there is not overlapping of people’ phone calls because the signal is constantly moving between stations. The first towers were built in Newark and Philadelphia and proved to be a success.

The latest technology in cellular telephones is the development of the 2.5 GHz phone. This phone cannot only place phone calls, it can also browse the web, send emails, and act as a personal data organizer. With this technology many products have been turned into one simple little phone. And I do mean little; these cellular telephones weigh mere ounces. They are capable of multitasking also. You can store phone number as you speak through voice recognition. These phones come with touch sensitive screens, color displays, hundreds of ringers, and some are even being built with built in digital cameras. Speakerphone is also a new feature of these phones. Now you can speak out loud from a farther distance in a personal space and the receiver will have pure and clear sound. These are all advantages of using a much higher frequency to transfer the digital signals created by the phone. Compared to the phones of the 70’s at 75 MHz, to today’s 2.5 GHz, the signal is nearly three times are strong. That means that your signal is coming through the receiver three times clearer than it was just 30 years ago. Just think of what tomorrow’s technology will bring. For a look into tomorrow’s technology click here.

Worked cited:

Carlo, George. (2001). Cell Phones; Invisible Hazards in the Wireless Age. New York: Carroll & Graf Publishers.

Hoff, Philip. (1998). Consumer Electronics for Engineers. New York: Cambridge University Press.

http://www.fcc.gov/Bureaus/Reports/cellr.txt

Krakow, Gary. “New 2.5G cell phones get even smarter.” [Online]. Available at www.msnbc.com/news/553383.asp)

Kyocera. “Phone Showcase.” [Online]. Available at http://www.kyocera-wireless.com/showroom/showcase/showcase.htm. [November 11, 2001]

MSNBC (2001). Cell Phones and Drivers Don't Mix. August 16. Retrieved from the World Wide Web: http://www.msnbc.com/news/614969.asp.

MSNBC (2001. No Brain Cancer-cell phone link. December 19. Retrieved from the World Wide Web: http://www.MSNBC.com/news/505569.asp

R.F. Safe. “Protect Yourself From Cell Phone & Computer RADIATION Exposure!” Available at http://www.rfsafe.com/rfsmodels.htm.

Samsung. “Go Wireless.” [Online]. Available at http://www.samsungusa.com/cgi-bin/nabc/prod/hhcommerce/telecommunications/prod_tel_subcategory_1.jsp. [November 2, 2001]

ZDNet (2001). Cell Phones linked to Cancer. January 16. Retrieved from the World Wide Web: http://www.zdnet.com/zdnn/stories/news/0,4586,2674533,00html.



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