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Recommended separation distances between
portable and mobile RF communications equipment and the FT7122
The FT7122 is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the FT7122 can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters)
and the FT7122 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 of transmitter
m
150 kHz to 80 MHz
d =
1,2
80 MHz to 800 MHz
d =
1,2
800 MHz to 2,5 GHz
d =
2,3
0,01
0,12
0,12
0,23
0,1
0,38
0,38
0,73
1
1,2
1,2
2,3
10
3,8
3,8
7,3
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 80 MHz and 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
absorption and reflection from structures, objects and people.
EXAMPLE 1 As indicated in Table 6 of IEC60601-1-2:2007 for ME EQUIPMENT, a
typical cell phone with a maximum output of 2 W yields
d
=3,3 m at an IMMUNITY
LEVEL of 3 V/m.
