30
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
(transmittters) and the device as recommended below, according to the
maximum output power of the communications equipment.
Rated
maximum
output power
of transmitter
(W)
Separation distance according to frequency Rated
maximum output of transmitter (m)
150 kHz to 80 MHz
d=1.167√P
80 MHz to 800 MHz
d=1.167√P
800 MHz to 2.5 GHz
d=2.333√P
0.01 0.117 0.117 0.233
0.1 0.369 0.369 0.739
1 1.167 1.167 2.333
10 3.690 3.690 7.378
100 11.67 11.67 23.33
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 reection from structures, objects and people.
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
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 reection from structures, objects and people.
a Field strengths from xed transmitters, such as base stations for radio (cellular /
cordless) telephones and land mobile radios, amateur radio, AM and FM radio broad-
cast and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to xed RF transmitters, an electromagnetic site
survey should be considered. If the measured eld 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, eld strengths should be less than
3V/m.
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