Nokia 3585 User Manual download pdf (Page 120)

Section 4: Safety Guidelines and Warranty Information

114 4A: Safety

of each transmitter. Typically, 21 channels per antenna sector are

available. For a typical cell site using sector antennas, each of the three

transmitting antennas could be connected to up to 21 transmitters for a

total of 63 transmitters. However, it is unlikely that all of the transmitters

would be transmitting at the same time. When omni-directional

antennas are used, a cellular base station could theoretically use up to 96

transmitters, but this would be very unusual, and, once again, it is

unlikely that all transmitters would be in operation simultaneously. Base

stations used for PCS communications generally require fewer

transmitters than those used for cellular radio transmissions, since PCS

carriers usually have a higher density of base station antenna sites.

11. Are wireless telephone base stations safe?

The electromagnetic RF signals transmitted from base station antennas

stations travel toward the horizon in relatively narrow paths. For

example, the radiation pattern for an antenna array mounted on a tower

can be likened to a thin pancake centered around the antenna system.

The individual pattern for a single array of sector antennas is wedge-

shaped, like a piece of pie. As with all forms of electromagnetic energy,

the power decreases rapidly as one moves away from the antenna.

Therefore, RF exposure on the ground is much less than exposure very

close to the antenna and in the path of the transmitted radio signal. In

fact, ground-level exposure from such antennas is typically thousands of

times less than the exposure levels recommended as safe by expert

organizations. So exposure to nearby residents would be well within

safety margins.

Cellular and PCS base stations in the United States are required to

comply with limits for exposure recommended by expert organizations

and endorsed by government agencies responsible for health and safety.

Measurements made near cellular and PCS base station antennas

mounted on towers have confirmed that ground-level exposures are

typically thousands of times less than the exposure limits adopted by the

FCC. In fact, in order to be exposed to levels at or near the FCC limits for

cellular or PCS frequencies an individual would essentially have to

remain in the main transmitted radio signal (at the height of the

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Nokia 3585 User Manual Page 120