Motorola Solutions Inc. 99FT4100 Manual De Usuario

This section describes how to evaluate the EME exposure of an antenna or at ground level.

The assessment is based on the following characteristics of the Andrew DB408 antenna:

6.6+2.15 

= 

10   

10 

 

= 

7.5 

P = 22.9  W 

γ 

= 0

 

L = 2.7 m 

The parameter 

 is thus 

. Upon inserting the power density limits established in 

Exposure Limits on page 104

 into formula (1), the following distances for occupational and general

public exposure compliance are respectively determined:

14cm

and

67cm

As both these distances are less than 

, the aforementioned choice (

Typical System

Configuration on page 104

) of considering the shorter, lower gain antenna to perform the assessment

is deemed valid. Longer, higher gain antennas would yield shorter compliance distances, for the same
input antenna power and operating frequency range.

Since the antenna installation height above ground level in the typical system configuration (20 m) is
larger than either of the compliance distances determined in 

Exposure in Front of the Antenna

, the

EME exposure at ground level is always compliant with the exposure limits defined in the ICNIRP
guidelines.

Based on the analysis in 

EME Exposure Evaluation on page 105

, the compliance boundaries for

occupational and general public exposure are defined as cylinders enclosing the antenna (see 

Figure

45: Compliance Boundary for General Public (GP) and Ocupational (OCC) Exposure on page 106

),

extending 75 cm (one wavelength) above and below the physical antenna, with radii:

Occupational exposure:

General Public exposure:

MN003557A01-AA

Appendix E: MOTOTRBO Repeater EME Assessment

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