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Recommended separation distance:
d = 1.2 √P
d = 1.2 √P 80 MHz to 800MHz
d = 2.3 √P 800 MHz to 2.5 GHz
where P is the maximum output power rating
of the transmitter in watts (W) according to
the transmitter manufacturer and d is the
recommended separation distance in metres (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey (a),
should be less than the compliance level in each
frequency range (b).
Interference may occur in the vicinity of equipment
marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher
frequency range applies.
NOTE 2 These guidelines may not apply in all
situations. Electromagnetic propagation is affected
by absorption and reflection from structures,
objects and people.
(a) Field strengths from fixed transmitters, such
as base stations for radio (cellular/cordless)
telephones and land mobile radios, amateur radio,
AM and FM radio broadcast and TV broadcast
cannot be predicted theoretically with accuracy.
To assess the electromagnetic environment due
to fixed RF transmitters, an electromagnetic site
survey should be considered. If the measured
field strength in the location in which the device is
used exceeds the applicable RF compliance level
above, the device should be observed to verify
normal operation. If abnormal performance is
observed, additional measures may be necessary,
such as re-orienting or relocating the device.
(b) Over the frequency range 150 kHz to 80 MHz,
field strengths should be less than 3V/m.
Table 6 Recommended separation
distances between portable and mobile
RF communications equipment and the
ME equipment or ME system – for ME
equipment and ME systems that are not
life supporting
Recommended separation distances between
portable and mobile RF communications
equipment and the device.
The device is intended for use in an electromagnetic
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.
Separation distance according to
frequency of transmitter (m)
Rated
150 kHz to
80 MHz
800 MHz
maximum
80 MHzd =
to 800
to 2.5 GHzd
1.2 √ P
output
MHz d =
= 2.3
power of
1.2 √ P
transmitter
(W)
0.01
0.12
0.12
0.2
0.1
0.37
0.37
0.74
1
1.2
1.2
2.3
10
3.7
3.7
7.4
100
12
12
23
For transmitters rated at a maximum output power
not listed above, the recommended separation
distance d in metres (m) can be estimated 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 At 80MHz and 800MHz, the separation
distance for the higher frequency range applies.
NOTE 2 These guidelines may not apply in all
situations. Electromagnetic propagation is affected
by absorption and reflection from structures,
objects and people.
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