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17
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 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 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 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 frequency range 150kHz to 80MHz. For Resp field strength
should be less than 1V/m.