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portable and mobile RF communications equipment and the GD311-401
The GD311-401 is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the GD311-401 can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the GD311-401 as recommended below, according to
the maximum output power of the communications equipment.
Rated maximum
output power of
transmitter
W
0,0
1
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.
Issue: 4 - 16/08/18
Recommended separation distance between
Separation distance according to frequency of
150 kHz to 80
MHz
d =1,2√P
0,1
2
0,38
1,2
3,8
12
transmitter m
80 MHz to 800 MHz
d =1,2√P
0,1
2
0,3
8
1,2
3,8
12
800 MHz to 2,5
GHz
d =2,3√P
0,2
3
0,7
3
2,3
7,3
23
Page 25 of 29
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