1V
rms
1V/m
Portable and mobile RF
communications equipment should be
used no closer to any part of the
equipment, including cables, than the
recommended separation distance
calculated from the equation
applicable to the frequency of the
transmitter.
Recommended separation distance
d＝[3.5/V
1
]
P
d＝[3.5/E
1
]
P
80MHz to 800MHz
d＝[7/E
1
]
P
800MHz to 2.5GHz
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
meters (m).
Field strength 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 80MHz and 800MHz, 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 transmitter, an electromagnetic site survey should be considered.
If the measured field strength in the location in which this equipment is used exceeds the
applicable RF compliance level above, the equipment should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such
as reorienting or relocating the equipment.
b.
Over the frequency range 150kHz to 80MHz, field strengths should be less than 1V/m.
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