Monday, November 21, 2011

Advantages & Disadvantages of Cell Phone Technology

From The Reports Of  Prof. Girish Kumar, IIT,Mumbai, Submitted to Department of Telecommunication, Govt. Of India. in last January 2010.

(This  important Report of Prof. Girish Kumar is produced here for the wide publicity & awareness of the  Public through this Blog ) :-

Cell Phone Technology has revolutionized the telecommunication scenario in India. Due to its several advantages, cell phone technology has grown exponentially in the last decade. Currently there are more 50 crore  cell phone users & nearly 4.5 lacks cell phone towers to meet the communication demand. The number of cell phone & cell towers  are increasing without giving due respect to its disadvantages. All over the World, people have been debating about associated health risk due to radiation from cell phone & cell towers. Radiation effects are divided into thermal & non thermal effects. Thermal effects are similar to that cooking in the microwave woven. Non thermal effects are not well defined but it has been reported that non thermal effects are 3 to 4 times more harmful than thermal effects.
A cell phone transmits 1 to 2 watts of power in the frequency range of 824 - 849 MHz (CDMA),890 -  915Mhz (GSM 900),& 1710 - 1780 Mhz (GSM1800). A cell phone has a SAR ( Specific Absorption Rate) rating. In USA , SAR limit for cell phone is 1.6 w / kg which is actually for 6 minutes per day usage. It has a safety margin of 3 to 4 , so a person should not use cell phone for more than 18 to  24 minutes / day. The information is not commonly known to the people in India.
Mobile Phone operators divide a region in large number of cells, & each cell is divided into number of sectors. The base  stations are normally configured to transmit different signals into each of these  sectors.
If number of users is distributed unevenly in the surrounding area,  then the sectors may be uneven. These  base stations are normally connected  directional antennas that are mounted on the roofs of building or on free- standing masts. A base stations & its transmitting power are designed in such a way that mobile phone should be able to transmit & receive enough signal for proper communication up to a few kilometers. Majority of these towers are mounted near the residential & office buildings to provide good mobile phone coverage  to the users. These cell tower transmit radiation 24x7, so people living within 10's of meters from the tower  will receive 10 000  to 10,000,000 times  stronger signal than required for mobile communication. In India, crores of people reside within these high radiation zones !!
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It is observed by the Blogger -- that all over India , the Mobile Towers  are installed in mostly low mounted Building Roofs where all antennas are facing  densely Residential buildings /Schools , Hospitals & not having most cell towers any  "Aviation lights fixed in its top & Warning Sign BoardS for public " displayed as per Govt. guide lines ??? 

1 comment:

  1. warm Greeting

    Have you been thinking about the power sources and the tiles whom use blocks
    I wanted to thank you for this great read!! I definitely enjoyed every little bit of it and I have you bookmarked to check out the new stuff you post.

    mobile tower light