37System Specifications
Recommended separation distances between portable and mobile RF communications
equipment and the S8 series of devices
The S8 series of devices is intended for use in an environment in which radiated RF disturbances are
controlled. The customer or the user of the S8 device can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the S8 device as recommended below, according to the maximum output power of the
communications equipment.
Separation distance according to frequency of transmitter
m
Rated maximum output
power of transmitter
W
150 kHz to 80 MHz
d = 1.17 √P
80 MHz to 800 MHz
d = 0.35 √P
800 MHz to 2.5 GHz
d = 0.7 √P
0.01 0.17 0.04 0.07
0.1 0.37 0.11 0.22
1 1.17 0.35 0.7
10 3.69 1.11 2.21
100 11.70 3.50 7.0
For transmitters rated at a maximum output power not listed above, the recommended separation distance
d in metres (m) can be determined 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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