Telecommunications

In general microwave frequencies are electromagnetic waves with frequencies in the range of 300 MHz to 300 GHz. In this range is the 2.4GHz is used in microwave ovens to heat food where water, sugar and fats absorb this radiation. This method is called dielectric heating. This is what is harmful to humans and what cooks the food in a microwave oven.

I have heard many rumors of concerned parents claiming cell phone towers at schools are harmful to their children.

A cellular beacon or tower, known as a cell-site, actually controls and limits it's RF output power for the sake of interference in reusable RF channels. This means they specially limit the output power so that the output does not range to far and interfere with other "cells". The best way to bring insight to this phenomena which is very hard to quantify for non-technical individuals who seems to makeup the largest part of the concerned community, is to use relative measures which can be better understood.

In this article we will use mW per square meter as a measure of microwave (harmful) radiation.

The ground-level power densities near typical cellular towers are on the order of 10 mW per sq meter or less while the sun radiates about 250 000 mW per sq meter average per 24 hour day which means, that during the day it's even much more. The radiation from the sun on the earth is about 25 000 times more than the radiation under a cell-site(cell phone tower) per sq meter.

The microwave oven in the kitchen have a magnetron (source of microwave radiation) that can produce in the order of 800W or 800 000mW microwave power, the shielding in the microwave oven will ensure a leakage at 5cm distance of radiation less than 10 000mW per sq meter.

So lets compare electromagnetic radiation magnitudes.

1) Sun average radiation on the earth = 250 000mW per sq meter (full electromagnetic spectrum)

2) Microwave oven leakage (5cm distance) = 10 000mW per sq meter (microwave)

3) Directly under cell site = 10mW per sq meter (microwave)

The safe standard for Specific absorption rate (SAR)is about 2000 mW/kg body tissue for cell phones. Although generally for other devices up to 10 000mW/kg can still be seen as safe.

The amount of radiation may vary according to position and distance, cell-sites are not isotropic radiators, this means that they are directional. The power they produce in front of them in the direction they are focused is much more than the power behind or below them. The antennas are often mounted three on tower to form hexagon cell and to produce a near omni-directional coverage. They appear to be harmless.

Motorola is a telecommunications company that originates from the USA.

Programmable Logic Controller (PLC) or programmable controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines.

public limited company.

advantages are being able to communicate, and transmit information over long distances. unfortunately though they cannot transmit into space on there own, and can break - being made out of fine glass and plastic that they are!
disadvantages is that you get splinters from the fibres and the really hurt trust me ive had a few of those little suckers ha de ha

When you are asked in what ways you can make a contribution to a company, you should discuss your special skills, and talents. As you list these skills, make sure to relate them to how they will be beneficial to the company.

The digital encoding techniques are of two types--Polar and Bipolar. The polar encoding are--RZ(Return to Zero), NRZ (No RZ) , Manchester and Differential Manchester. Bipolar encoding are--AMI ( Alternate Mark Inversion) and BnZS ( Bipolar n Zero Substitution).

examples of internal noise.thermal noise,short noise,i/f noise

different pats and functions of a telephone

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The best way to communicate between motorcycles is with blue tooth equipped helmets.

A Business Process Outsourcing (BPO) organisation is responsible for performing a process or a part of a process of another business organisation; outsourcing is done to save on costs or gain in productivity. A call center performs that part of a client's business which involves handling telephone calls. A call center, for example, might handle customer complaints coming in over a telephone.

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I was looking for this song myself, as it is very beautiful :o) But the answer is Landon Pigg---Falling in Love at a Coffee Shop. Hope that helped! :D

I think you mean sun-spots

nope. you have to call.

Yes.

It's Dean Chekvala.

Born in Niteroi, Rio de Janeiro, Brazil in October 30, 1960.

Ten cents.

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Yes, they did. In fact Morse code was invented for the first electronic telegraph.

Use the telegraph

yes.