8
Recommended separation distances between portable and mobile RF
communications equipment and the CMA-D2MDCE
The CMA-D2MDCE is intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the CMA-D2MDCE can help
prevent electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communications equipment (Transmitters) and the CMA-D2MDCE 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
150 kHz to 80 MHz
d
= 1.2
√
P
80 MHz to 800 MHz
d
= 1.2
√
P
800 MHz to 2.5 GHz
d
= 2.3
√
P
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
100
12
12
23
For transmitters rated a maximum output power not listed above, the recommended separation
distance
d
in meters (m) can be estimated using the equation applicable to the frequency of the
transmitter, where
P
is the maximum output power rating of the transmitter in watts (W)
according to the transmitter manufacturer.
NOTE 1: At 80 MHz and 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.
