30 User’s Guide
Recommended Separation Distances Between Portable and Mobile RF Communications Equi-
pement and the AMM213TD/AMM240WTD System
The AMM213TD/AMM240WTD system is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The user of the AMM213TD/AMM240WTD system can help
prevent electromagnetic interference by maintaining a minimum distance between portable and mobile
RF communications equipment (transmitters) and the AMM213TD/AMM240WTD system as recommended
below, according to the maximum output power of the communications 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 2.5GHz
d=2.33, 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 3.70 3.70 7.37
100 11.70 11.70 23.30
For transmitters rated at a maximum output power not listed above, the recommended separation distance (d) in me-
ters (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
reection from structures, objects, and people.
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