d=1.2 P 80MHz to 800MHz
d=2.3 P 800MHz to 2.5MHz
Here 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 form fixed
RF transmitters, as determined by an
electromagnetic site survey, should be less than the
compliance
b
level in each frequency range.
Interference may occur in the vicinity of equipment
marked with the following symbol:
NOTE 1 At 90MHz 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 transmitters, anelectromagnetic site survey should be
considered. If the measured field strength in the location in which theIT-121 is used exceeds the applicable RF
compliance level above, theIT-121 should be observed to
verify normal operation. If abnormal performance is
observed, additional measures may
be necessary, such as reorienting or relocating theIT-121
b
Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.
Recommended separation distances between portable and mobile RF communications equipment and
the IT-121
TheIT-121 is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of theIT-121 can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters)
and theIT-121 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
Rated
maximum
output power
of transmitter
W
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