30
Recommended separation distances between
portable and mobile RF communications equipment and the Precise SHP
The Precise SHP is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The
customer or the user of the Precise SHP can help prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the Precise SHP 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
80 MHz to 800 MHz
800 MHz to 2.5
d = [3.5/V1]
√
P
d = [3.5/E1]
√
P
GHz
d = [7/E1]
√
P
0.01
0.12
0.12
0.23
0.1
0.37
0.37
0.74
1
1.17
1.17
2.33
10
3.69
3.69
7.39
100
11.67
11.67
23.33
For transmitters rated at 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.
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