Nokia PM 3205 Manuel D’Utilisation

(The following information comes from a consumer information Website 

 

jointly sponsored by the U.S. Food and Drug Administration (FDA) and the 

 

Federal Communications Commission (FCC), entitled “Cell Phone Facts: 

 

Consumer Information on Wireless Phones.” The information reproduced 

 

herein is dated July 29, 2003. For further updates, please visit the Website: 

 

http://www.fda.gov/cellphones/qa.html.)

Radiofrequency (RF) energy is another name for radio waves. It is one form of 
electromagnetic energy that makes up the electromagnetic spectrum. Some of 
the other forms of energy in the electromagnetic spectrum are gamma rays, x-
rays and light. Electromagnetic energy (or electromagnetic radiation) consists 
of waves of electric and magnetic energy moving together (radiating) through 
space. The area where these waves are found is called an electromagnetic field.

Radio waves are created due to the movement of electrical charges in antennas. 
As they are created, these waves radiate away from the antenna. All 
electromagnetic waves travel at the speed of light. The major differences 
between the different types of waves are the distances covered by one cycle of 
the wave and the number of waves that pass a certain point during a set time 
period. The wavelength is the distance covered by one cycle of a wave. The 
frequency is the number of waves passing a given point in one second. For any 
electromagnetic wave, the wavelength multiplied by the frequency equals the 
speed of light. The frequency of an RF signal is usually expressed in units called 
hertz (Hz). One Hz equals one wave per second. One kilohertz (kHz) equals one 
thousand waves per second, one megahertz (MHz) equals one million waves per 
second, and one gigahertz (GHz) equals one billion waves per second.

RF energy includes waves with frequencies ranging from about 3000 waves per 
second (3 kHz) to 300 billion waves per second (300 GHz). Microwaves are a 
subset of radio waves that have frequencies ranging from around 300 million 
waves per second (300 MHz) to three billion waves per second (3 GHz). 

Probably the most important use of RF energy is for telecommunications. Radio 
and TV broadcasting, wireless phones, pagers, cordless phones, police and fire 
department radios, point-to-point links and satellite communications all rely on 
RF energy. 

Other uses of RF energy include microwave ovens, radar, industrial heaters and 
sealers, and medical treatments. RF energy, especially at microwave 
frequencies, can heat water. Since most food has a high water content, 
microwaves can cook food quickly. Radar relies on RF energy to track cars and 
airplanes as well as for military applications. Industrial heaters and sealers use 
RF energy to mold plastic materials, glue wood products, seal leather items 
such as shoes and pocketbooks, and process food. Medical uses of RF energy 
include pacemaker monitoring and programming.