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4.7 Recommended separation distances between por-
table and mobile RF communications equipment and the
device
These devices are intended for use in an environment in which radiated RF
disturbances are controlled. The customer or the user of the device can help
prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters)
and the device as recommended below, according to the maximum output
power of the communications equipment.
Rated maximum
Separation distance according to
output power
frequency of transmitter (m)
of transmitter (W)
150 kHz
80 MHz
800MHz
to 80 MHz
to 800 MHz
to 2.5 GHz
0.01
0.12
0.018
0.035
0.1
0.37
0.057
0.11
1
1.17
0.18
0.35
10
3.7
0.57
1.1
100
11.7
1.8
3.5
For transmitters rated at a maximum output power not listed above, the
recommended separation distance d in meters (m) can be determined using
the equation applicable to the frequency of the transmitter, where P is the
maximum output power rating of the transmitter in watts (W) according to
the transmitter manufacturer.
Notes:
1. At 80 MHz and 800 MHz, the separation distance for the higher frequency
range applies.
2. These guidelines may not apply in all situations. Electromagnetic propa
-
gation is affected by absorption and reflection from structures, objects and
people.
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