en
observed to verify normal operation. If abnormal performance is observed, additional
measures may be necessary, such as reorienting or relocating the system.
d) Over the frequency range 150kHz to 80MHz, field strengths shall be less than 3 V/m.
Recommended Separation Distances Between Portable and Mobile RF Communication
Equipment and system.
The system is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The user of the system can help prevent electromagnetic
interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters and the system as recommended below,
according to the maximum output power of the communication equipment.
Rated maximum
output power (W)
of transmitter
Separation distance (m) according to frequency of transmitter
150kHZ to 80MHz
D = 1.17√P
80MHz to
800MHZ
D = 1.17√P
800MHz to 2.7GHz
D = 2.33√P
0.01 0.12 m 0.12 m 0.23 m
0.1 0.37 m 0.37 m 0.74 m
1 1.17 m 1.17 m 2.33 m
10 3.70 m 3.70 m 7.37 m
100 11.7 m 11.7 m 23.3 m
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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