The history of mobile phones begins with early efforts to develop mobile telephony concepts using two-way radios and continues through emergence of modern mobile phones and associated services.
Radiophones have a long and varied history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio telephony, through the Second World War with military use of radio telephony links and civil services in the 1950s, while hand-held mobile radio devices have been available since 1973. Mobile phone history is often divided into generations (first, second, third and so on) to mark significant step changes in capabilities as the technology improved over the years.
Cellular concepts
In December 1947, Douglas H. Ring and W. Rae Young, Bell Labs engineers, proposed hexagonal cells for mobile phones in vehicles.[2] Philip T. Porter, also of Bell Labs, proposed that the cell towers be at the corners of the hexagons rather than the centers and have directional antennas that would transmit/receive in three directions (see picture at right) into three adjacent hexagon cells.[3] At this stage the technology to implement the ideas did not exist nor had the frequencies had been allocated and it would be some years until Richard H. Frenkiel and Joel S. Engel of Bell Labs developed the electronics to achieve this in the 1960s.
Wednesday, May 4, 2011
Monday, May 2, 2011
Cell Phones may be Harm Phones !!
It has become quite common to see people talking on their cell phones just about everywhere you go. The cell phone industry has been very effective at selling people on the convenience and coolness of being connected and reachable no matter where they are.
Project 10 to 15 years into the future. By that point the “cell phone epidemic” may have claimed many lives through cancer, Alzheimer’s, strokes, auto accidents, and other consequences of regular cell phone usage; unless the present level of use is cut dramatically.
If people knew that they were undermining their own health as well as the health of those around them when they use a cell phone, would the devices be as popular?
Probably not; that is why you have not heard much about the hazard of cell phone use. Just like the tobacco companies who stonewalled against the idea that cigarette smoking is harmful to health, the cellular companies are keeping cell phone dangers from being known.
Further, the major media have not presented much information on cell phone radiation either. As you know, millions of dollars are spent on the advertising of cellular service and equipment.
Do you think the government would intervene if cell phones are harming people? How many years did it take before the government required warning labels on cigarettes?
What about chlorine, a known poison, being added to every city’s water supply to kill microbes? Do they warn you about the long term negative health effects of that?
If something is a big business, and it offers benefits that the marketplace supports, and it is not immediately destructive, the government tends to let it go, even though it may be hurtful over a long period of time.
What you don't know CAN hurt you. Ignoring the information on cell phone problems could have much graver consequences than just being ignorant. It is time to learn about the cell phone hazard now, before it is too late.
In Europe this would be called mobile phone harm, or mobile phone danger, or the mobile phone problem. Mobile phone radiation is the same as cell phone radiation, and it is not good for anybody.
WARNING: Cordless portable phones in your home are just as bad if not worse. Other electronic devices put out harmful electromagnetic fields also.
Project 10 to 15 years into the future. By that point the “cell phone epidemic” may have claimed many lives through cancer, Alzheimer’s, strokes, auto accidents, and other consequences of regular cell phone usage; unless the present level of use is cut dramatically.
If people knew that they were undermining their own health as well as the health of those around them when they use a cell phone, would the devices be as popular?
Probably not; that is why you have not heard much about the hazard of cell phone use. Just like the tobacco companies who stonewalled against the idea that cigarette smoking is harmful to health, the cellular companies are keeping cell phone dangers from being known.
Further, the major media have not presented much information on cell phone radiation either. As you know, millions of dollars are spent on the advertising of cellular service and equipment.
Do you think the government would intervene if cell phones are harming people? How many years did it take before the government required warning labels on cigarettes?
What about chlorine, a known poison, being added to every city’s water supply to kill microbes? Do they warn you about the long term negative health effects of that?
If something is a big business, and it offers benefits that the marketplace supports, and it is not immediately destructive, the government tends to let it go, even though it may be hurtful over a long period of time.
What you don't know CAN hurt you. Ignoring the information on cell phone problems could have much graver consequences than just being ignorant. It is time to learn about the cell phone hazard now, before it is too late.
In Europe this would be called mobile phone harm, or mobile phone danger, or the mobile phone problem. Mobile phone radiation is the same as cell phone radiation, and it is not good for anybody.
WARNING: Cordless portable phones in your home are just as bad if not worse. Other electronic devices put out harmful electromagnetic fields also.
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