User Manual

227
MN024-08
To meet RSS Canadian standards the following guidelines has to be taken into
account:
The manufacturer rated output power of the equipment is for single carrier
operation. For situations in which multiple carrier signals are present, the
rating would have to be reduced by 3.5dB especially when the output
signal is re-radiated and can cause interference to adjacent band users.
This power reduction is to be by means of input power or gain reduction
and not by an attenuator at the output of the device.
To satisfy RF exposure requirements, the antenna(s) used for the system
must be installed to provide a separation distance of at least 20cm from all
people and the highest antenna gain which can be used is 12dBi.
6.7. Electromagnetic Fields and RF Power
Britecell
Plus system generates electromagnetic radiation, which can
exceed safety levels in the immediate vicinity of the antenna.
The most widely accepted standards are those developed by the
International Commission on Non-Ionizing Radiation Protection (ICNIRP)
and the Institute of Electrical and Electronics Engineers (IEEE).
Formula for minimum safety distances
The formula for calculating the minimum safety distances uses the
specifications of a particular antenna that could be driven by TFAx.
()
S
P
r
LG
π
4
10
10
min
=
(6.1)
This equation includes the following factors:
G is the antenna gain (in dB) compared to isotropic
radiating antenna;
P is the RF power that is present at the antenna connector
(in W);
L is the total loss (in dB) between the TFAx remote unit
output port and the antenna input port;
S is the maximum allowed power density in air (in W/m
2
).
Its values should be calculated according to the limit
exposures to time-varying and magnetic fieds. The
reference values are reported in ICNIRP guidelines, unless
otherwise specified by specific regulations.