Nokia 3585 User Manual download pdf (Page 119)

Section 4: Safety Guidelines and Warranty Information

4A: Safety 113

9. Do wireless phone accessories that claim to shield the head

from RF radiation work?

Since there are no known risks from exposure to RF emissions from

wireless phones, there is no reason to believe that accessories that claim

to shield the head from those emissions reduce risks. Some products that

claim to shield the user from RF absorption use special phone cases,

while others involve nothing more than a metallic accessory attached to

the phone. Studies have shown that these products generally do not work

as advertised. Unlike "handsfree" kits, these so-called "shields" may

interfere with proper operation of the phone. The phone may be forced to

boost its power to compensate, leading to an increase in RF absorption.

In February 2002, the Federal trade Commission (FTC) charged two

companies that sold devices that claimed to protect wireless phone

users from radiation with making false and unsubstantiated claims.

According to FTC, these defendants lacked a reasonable basis to

substantiate their claim.

10. What are wireless telephone base stations?

Fixed antennas used for wireless telecommunications are referred to as

cellular base stations, cell stations, PCS ("Personal Communications

Service") stations or telephone transmission towers. These base stations

consist of antennas and electronic equipment. Because the antennas

need to be high in the air, they are often located on towers, poles, water

tanks, or rooftops. Typical heights for freestanding base station towers are

50-200 feet.

Some base stations use antennas that look like poles, 10 to 15 feet in

length, that are referred to as "omni-directional" antennas. These types

of antennas are usually found in rural areas. In urban and suburban

areas, wireless providers now more commonly use panel or sector

antennas for their base stations. These antennas consist of rectangular

panels, about 1 by 4 feet in dimension. The antennas are usually

arranged in three groups of three antennas each. One antenna in each

group is used to transmit signals to wireless phones, and the other two

antennas in each group are used to receive signals from wireless phones.

At any base station site, the amount of RF energy produced depends on

the number of radio channels (transmitters) per antenna and the power

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Nokia 3585 User Manual Page 119