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Airbridge cBTS3612 CDMA Base Station
Appendix D Electromagnetic Radiation
D.1 Introduction
Base Transceiver Station (BTS) emit RF radiation (Radiation Hazard). Although
there is no scientific evidence of possible health risks to persons living near to base
stations some recommendations are giving below for the installation and operation
of base station transceivers. Ope rators of base station transceivers are required to
obey the local regulation for erecting base station transceivers.
The Federal Communications Commission (FCC), are imposing MPE ( maximum
permissible exposure) limits. FCC CFR part 1, subpart I, section 1 .1307 requires
operator to perform a Enviromenta Assemessmet (EA). Equipment listed in the table
1 of before mentioned part are subjected to routine environmental evaulation. For
facilities and operations licensed under part 22, licensees and manufactuere are
required tto ensure that their facility and equipment comply with IEEE C95.1-1991.
The objective of the Environmental Evaluation is to ensure that human exposure to
RF energy does not go beyond the maximum permissible levels stated in the
standard. Therefore certain sites do not require an evaluation by nature of its design.
It could be that the antennas are placed high enough thereby resulting in extremely
low RF fields by the time it reaches areas that would be accessible to people.
Environmental evaluations are required, for Paging and Cellular Radiotelephone
Services, Part 22 Subpart E and H;
Non-rooftop antennas: height of radiation center < 10m above ground level and
l
total power of all channels > 1000 W ERP (1640 W EIRP)
Rooftop antennas: total power of all channels > 1000 W ERP (1640 W EIRP)
l
D.2 Maximum Permissible Exposure (MPE)
Maximum permissible exposure (MPE) refers to the RF energy that is acceptable for
human exposure, given the scientific research to date. It is broken down into two
categories, Controlled and Uncontrolled. Controlled limits are used for persons such
as installers and designers that are in control of the hazard and exposed to energy
for limited amounts of time per day. Occupational/controlled limits apply in situations
in which are persons are exposed as a consequence of their employment provided
those persons are fully aware of the potential for exposure and can exercise control
over their exposure. Limits for occupational/controlled exposure also apply in
situations
when
an
individual
Appendix D Electromagnetic Radiation
is
transient
through
D-1
System Description
a
location
where
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