Installation Instructions

1. Introduction

Safety Precautions, Continued

RF exposure

assessment,

continued

RF Exposure General Guidelines for equipment installation

As a general rule it is expected that the highest level of emission would be

in line of sight and in close vicinity of the antenna. Additional requirements

for the installation of equipment shall be as follows:

 The equipment should be located in such a way to prevent the public from

accessing the area where the RF Radiation exceeds the regulation limits.

For this, a compliance boundary is determined, based on its radio

characteristics. Outside this area the RF radiation levels are below the

reference levels (limits).

 Operation and maintenance personnel, which have to work within the RF

radiation compliance boundary area, should be informed about the source

of radiation and should have the capability to power off the radio

equipment before entering the compliance boundary area.

 The compliance boundary area should be defined by a relevant warning

sign or physical barrier.

Radiation Exposure Assessment – Compliance Boundary Calculation

In order to calculate the RF exposure compliance boundary around a Radio

Equipment and its antenna, a theoretical approach is described below. As

the installation environment could be complex, i.e obstacles causing

reflections or scattering, soil conditions etc., this approach may be used to

provide a rough estimation of the expected exposure in power flux density

on a certain point. More precise estimations can be feasible if detailed

knowledge of the installation environment is available. In some cases a

safety factor can be used to increase the level of confidence.

The power flux density S can be calculated using the following formula:

S=P*G

num

/ (4*r

*π)

where,

 P = is the maximum power at the antenna port of the Radio Equipment,

 G

num

= is the numerical gain of the antenna,

 r = is the distance between the antenna and the point of interest.

Continued on next page