43
12.4 Recommended separations between portable and mobile RF Communications
equipment and the ATMOS C 21 / C 31
NOTE 1 By 80 MHz and 800 MHz the higher frequency range applies.
NOTE 2
These guidelines might not be applicable in any case. The emanation of electromagnetic waves is affected by absorption and
reflection of buildings, objects and people.
The ATMOS C 21 / C 31 is intended for use in electromagnetic environment in which radiated disturbances are controlled. The
customer or user of the ATMOS C 21 / C 31 can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF Communications equipment and the ATMOS C 21 / C 31 as recommended below, according to
the maximum output power of the communications equipment.
Safety distance, depending on transmit-frequency m
Nominal output of the
transmitter
W
150 kHz to 80 MHz
d =
[ 3.5 / 3]
√P
80 MHz to 800 MHz
d =
[ 3.5 / 3]
√P
800 MHz to 2.5 GHz
d =
[ 7.0 / 3]
√P
0.01
0.12
0.12
0.24
0.1
0.37
0.37
0.74
1
1.2
1.2
2.4
10
3.69
3.69
7.38
100
11.66
11.66
23.32
For transmitters for which the maximum nominal output is not indicated in the above table, the recommended safety distance
d in meters (m) can be determined using the equation belonging to the respective column whereas P is the maximum nominal
output of the transmitter in watts (W) acc. to manufacturer´s specification.
NOTE 1 By 80 MHz and 800 MHz the higher frequency range applies.
NOTE 2
These guidelines might not be applicable in any case. The emanation of electromagnetic waves is affected by absorption and
reflection of buildings, objects and people.
a
The field strength of stationary transmitters, such as base stations of cellular phones and mobile terrain radio equipment,
amateur radio transmitters, cbm broadcast and TV stations cannot be predestined exactly. To determine the electromagnetic
environment in regard to stationary transmitters, a study of the location is to be considered. If the measured field strength
at the location where the ATMOS C 21 / C 31 is used exceeds the above compliance level, the ATMOS C 21 / C 31 is to
be observed to verify the intended use. If abnormal performance characteristics are noted, additional measures might be
necessary, e. g. a changed arrangement or another location for the ATMOS C 21 / C 31.
b
Within the frequency range of 150 kHz to 80 MHz the field strength should be below 3 V/m.
12.0 Notes on EMC
