Instruction Manual

Warnings
DN00204118 © Nokia Corporation 11 (22)
Issue 3- 0 en Nokia Proprietary and Confidential
WARNING
WARNING
WARNING
2.5.1 General guidelines
The antenna generates electromagnetic radiation which can exceed safety
levels when a person is working in very close proximity to the antennas.
Observe the minimum distance precautions shown in Table 1 when working
in close proximity to an antenna operating at full power.
Do not install the MU, RUs or the antennas in areas where there is a potential
risk for interference with inadequately shielded medical equipment such as
hearing aids, life support devices or other electrically or magnetically
sensitive devices.
When installing the MU, RUs or its antennas, the emission of other antennas
nearby has to be known beforehand so that ambient emissions can be
managed properly.
2.5.2 Formula for minimum safety distances
This section presents the formula for calculating the minimum safety distances
using the specifications of the particular antenna.
Figure 4. Formula for calculating minimum safety distance (r
min
)
The equatio in Figure includes the following factors:
• G is the antenna gain (in dB) compared to isotropically radiating antenna
• P is the power measured at the antenna port of RU (W)
• L is the total loss (in dB) between the antenna port of RU and the antenna
input
• S is the maximum allowed power density in air (W/m
2
)
r
min
=
S
4
10
P
(G-L)
10