Nokia 3585 User Manual download pdf (Page 113)

Section 4: Safety Guidelines and Warranty Information

4A: Safety 107

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).

2. How is radio frequency energy used?

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.

3. How is radio frequency radiation measured?

RF waves and RF fields have both electrical and magnetic components. It

is often convenient to express the strength of the RF field in terms of each

component. For example, the unit "volts per meter" (V/m) is used to

measure the electric field strength, and the unit "amperes per meter" (A/

m) is used to express the magnetic field strength. Another common way

to characterize an RF field is by means of the power density. Power

density is defined as power per unit area. For example, power density can

be expressed in terms of milliwatts (one thousandth of a watt) per square

centimeter (mW/cm2 or microwatts (one millionth of a watt) per square

centimeter (µW/cm2).

The quantity used to measure how much RF energy is actually absorbed

by the body is called the Specific Absorption Rate or SAR. The SAR is a

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Nokia 3585 User Manual Page 113