ELECTROMAGNETIC DISTANCE RECOMMENDATIONS
Recommended separation distance between portable and mobile RF
communications equipment and the Ultima 12(KM908) and Ultima 9(KM907).
The Ultima 12(KM908) and Ultima 9(KM907) are intended for use in an
electromagnetic environment in which radiated RF disturbances are controlled.
The customer or the user of the Ultima 12(KM908) and Ultima 9(KM907) can
help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and
the Ultima 12(KM908) and Ultima 9(KM907) as recommended below, according
to the maximum output power of the communications equipment.
Rated maximum
output
power of transmitter
(W)
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in metres (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.
NOTE1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Separation distance according to frequency of transmitter
150 kHz to 80 MHz
d =1,2√P
0.12
0.38
1.2
3.8
12
(m)
80 MHz to 800 MHz
d =1,2√P
0.12
0.38
1.2
3.8
12
800 MHz to 2.5 GHz
d =2,3√P
0.23
0.73
2.3
7.3
23
12