65
a
The radio base station (cellular and wireless) and ground mobile radio mobile phone antenna,
receiver, field FM and am radio as well as TV broadcast is unable to use pure theory to accurately
estimate.
In order to evaluate the electromagnetic environment of fixed RF transmitter generates, should be taken
into account. Electromagnetic field measurement method using field measured if the equipment
operating environment more than the required RF level, it is necessary to observe the equipment to
work properly. Once the abnormal situation, some measures should be taken, such as re placing the
machine direction or move it to the environment.
b
In the 150kHz-80MHz frequency range, the field strength should be less than 1V/m.
Table 4
：
Recommended distance between this system and portable / mobile RF communication
equipment
This system can be used to control the electromagnetic environment in RF interference. In order to
avoid the electromagnetic interference, customers or users should maintain the minimum distance
between the proposed system and portable / mobile RF communication equipment. The following
suggestions to keep the distance is calculated according to the maximum output power of
communication equipment.
Maximum rated output
power of transmitter
（
W
）
Distance from the transmitter frequency
（
m
）
150kHz -80MHz
P
d
=
1
5
.
3
80MHz-800MHz
P
d
=
3
5
.
3
800MHz-2.5GHz
P
d
=
3
7
0.01
0.35
0.12
0.23
0.1
1.11
0.37
0.74
1
3.50
1.17
2.34
10
11.07
3.69
7.38
100
35.00
11.67
23.34
If the rated maximum output power of the transmitter is not included in the values given above, can
be estimated by using the corresponding column isolation distance equation. In the equation P is the
nominal maximum output power of transmitter manufacturers are given, measured in watts.
If the system image severely disturbed affect diagnosis, it is necessary to set the device away from
the noise source or install the external RF transmission power noise filter the noise reduced to an
acceptable level.
Be careful 1 : In 80MHz-800MHz, using a higher frequency formula
Be careful 2: These guidelines do not apply in all cases. The material structure, objects and
people can absorb and reflect electromagnetic waves, thus affecting the electromagnetic
propagation.
Table 5
Fundamental characteristics
