Winback Back4 Manuel Utilisateur page 51

Recommended separation distances between portable and mobile RF communications equipment and
the above listed models
The BACK4 is intended for use in an electromagnetic environment in which radiated RF disturbance variables
are controlled. The customer or user of the BACK4 can help prevent electromagnetic interference by maintain-
ing a minimum distance between portable and mobile RF communications equipment (transmitters) and the
BACK4 as recommended below, based on the maximum output power of the communications equipment.
Rated maximum output
power of transmitter (W)
0.01
0.1
1
10
100
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.
NOTE 1: From 80 MHz to 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2 : These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorp-
tion and reflection from structures, objects and people.
WARNING:
Use of this equipment next to or stacked with other equipment should be avoided because it could
result in improper operation. If such use is necessary, this equipment and the other equipment
should be monitored to verify that it is operating normally.
Portable RF communications equipment (including peripherals such as antenna cables and external
antennae) should be used no closer than 30cm (12 inches) to any part of the electromagnetic
equipment or system, including cables specified by the manufacturer. Otherwise, degradation of
the performance of this equipment could result.
Protection distance based on transmitter frequency (m)
150 kHz to 80 80 MHz to 800
MHz MHz
d = 1.2√P d = 1.2√P
0.12 0.12
0.38 0.38
1.2 1.2
3.8 3.8
12 12
800 MHz to 2.5 GHz
d = 2.3√P
0.23
0.73
2.3
7.3
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