Installation Manual

It should be noted that this formula is generally accurate in the far field region, however, as explained
in section "Equations for Predicting RF Fields" in [2], it tends to over-predict power density in the near
field and therefore can be used for making a conservative prediction.
Return to Process
Exposure Prediction Model on page 135
E.4
Exposure Limits
Applicable guidelines and regulations are referenced for the EME exposure assessment. The SAR
limits are those defined in the ICNIRP guidelines [1] and U.S. FCC regulations [2-3].
The ICNIRP guidelines are 10 W/kg for the peak spatially averaged SAR over 10 g and 0.4 W/kg for
the whole-body average SAR in occupational-type exposure conditions, and 2.0 W/kg for the peak
spatially averaged SAR over 10 g and 0.08 W/kg for the whole-body average SAR in general public
exposure conditions.
The U.S. FCC regulations feature 8 W/kg for the peak spatially averaged SAR over 1 g and 0.4 W/kg
for the whole-body average SAR in occupational-type exposure conditions, and 1.6 W/kg for the peak
spatially averaged SAR over 1 g and 0.08 W/kg for the whole-body average SAR in general public
exposure conditions.
The ICNRIP guidelines also define the reference levels and U.S. FCC regulations define the MPE
limits in terms of equivalent plane wave power density. In the applicable VHF frequency range
(136-174 MHz) it is 10W/m
2
in occupational-type exposure conditions and 2 W/m
2
in general public
exposure conditions.
Return to Process
MOTOTRBO Repeater EME Assessment
on page 133
E.5
EME Exposure Evaluation
The employed exposure evaluation method and results are equally applicable to both indoor and
outdoor exposure conditions even though particular antenna models are meant specifically for only
indoor (HKAD4003, HKAD4004, HKAD4005, HKAE4003, HKAE4004, and HKAE4005) or only outdoor
(Andrew DB408-B) installation.
For each antenna models the maximum operating frequency and maximum RF power was used in
SAR evaluation to produce the most conservative estimate of exposure within the respectively
applicable frequency band. The distance from the antenna was minimized to arrive at the maximum
exposure condition where SAR is still below the compliance limit. In many instances, however, even at
the minimum formula validity distance of 20 cm, the SAR values are very small, especially for the
occupational-type exposure limits. In those cases, this minimum distance of 20 cm was used to define
the conservative compliance boundary.
Table 32: Compliance Distance in General Public Exposure (UHF) on page 141 shows the compliance
distance for each evaluated UHF antenna in general public exposure condition alongside the
MN003557A01-AF
Appendix
E: MOTOTRBO Repeater EME Assessment
140