33
Guidance and manufacture’s declaration – electromagnetic immunity
80 MHz to 800 MHz：d=1.2 √p
800 MHz to 2.7 GHz：d=2.3 √p
Where, P is the maximum output power
rating of the transmitter in watts (W) ac-
cording to the transmitter manufacturer and
d is the recommended separation distance.
Field strengths from fixed RF transmitters,
as determined by an electromagnetic site
survey, should be less than the compliance
level in each frequency range. Inter-
ference may occur in the vicinity of equip-
ment marked with the following symbol:
A.
B.
At 80 MHz and 800 MHz, the higher frequency range applies.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption
and reflection from structures, objects and people.
10 V/m
80 MHz to 2.7 GHz
80% AM at 1 kHz
Radiated RF
IEC 61000-4-3
10 V/m
80 MHz to 2.7 GHz
80% AM at 1 kHz
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 elec-
tromagnetic 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.
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
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