User's Manual

Compliance Information
C-10 LGCell 4.0 Installation, Operation, and Reference Manual PN 8100-40
620004-0 Rev. B
C.4 Human Exposure to RF
The U.S. Federal Communications Commission (FCC) has adopted limits of human
exposure to radio frequency (RF) emissions from portable or fixed RF systems that
are regulated by the FCC. The exposure limits on the incident electric and magnetic
fields and power densities are based on ANSI/IEEE and NCRP RF Safety Guidelines.
The limits are also prescribed in terms of the mass-normalized rates of internal energy
absorption by tissues (specific absorption rates or SARs) which should not exceed
0.08 W/kg as averaged over the whole body and 1.6 W/kg for any 1-g of tissue.
Similarly, the U.K. National Radiological Protection Board (NRPB) and the Interna-
tional Commission on Non-Ionizing Radiation Protection (ICNIRP) have both estab-
lished guidelines for maximum RF exposure levels that are likely to not pose health
risks. For the general public, ICNIRP recommends maximum exposure levels of
2.0 W/kg for any 10-g of tissue. This recommendation is 5 times lower than that of
NRPB.
The specific absorption rate (SAR) was measured for a radiated power of 20 dBm
(100 mW) which is the maximum radiated for both of the antennas. The highest SAR
regions for each of the antennas for separation distances of 0, 1, 2, and 3 cm to the tis-
sue-simulant model were determined in the first instance by using a coarser sampling
with a step size of 8.0 mm over three overlapping scan areas for a total scan area of
8.0 × 9.6 cm. After identifying the regions of the highest SAR for each of the cases,
the SAR distributions were measured with a resolution of 2 mm in order to obtain the
peak 1 cm 3 or 1-g SAR.
The peak 1-g SARs were measured and are shown in Table C-1. The reason for the
lower SARs for the 880 MHz lower frequency antenna for each of the separation dis-
tances is the larger size of the RAU Model 850 OM3W-SM00L antenna. This helps
to spread the electromagnetic fields thus resulting in lower SARs.
Note that for 800 MHz RAUs at all separation distances, SARs are less than
1.6 W/kg, the level suggested in the FCC, IEEE/ANSI, NCRP, and ICNIRP Guide-
lines. For the 1900 MHz antenna, a separation distance of 2 cm from the antenna sur-
face to the tissue is enough to comply with the peak 1-g SAR of 1.6 W/kg suggested
in the various safety guidelines.
Table C-1 Peak 1-g SAR for RAU Models 850 and 1900
RAU Distance
from a Human
Head (cm)
800 MHz System
Peak 1-g SAR
1900 MHz System
Peak 1-g SAR
0 1.331 4.995
1 0.942 2.213
2 0.646 1.153
3 0.472 0.676