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Recommended separation distances between:
Portable and Mobile RF Communications Equipment and FSD
FSD is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The
customer or the user of t FSD can help prevent electromagnetic interference by maintaining a minimum distance
between port able and m obi le RF communications equipment (transmitters)and the FSD as recommended
below, according to the maximum out put power of t he communications equipment.
Rated maximum output power of transmitter
Watts [W]
distance according to frequency of transmitter meters [m]
150kHz to 80MHz
d = 1.17√P
80MHz to 800MHz
d = 1.17√P
800MHz to 2.5GHz
d= 2.34√P
0.12 0.12 0.24
0.37 0.37 0.74
1.17 1.17 2.34
3.7 3.7 7.4
11.7 11.7 23.4
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.
Table 4: Separation Distances
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