Vyaire SpiroUSB Manuel D'utilisation page 34

Recommended separation distances between portable and mobile RF
communications equipment and the SpiroUSB
The SpiroUSB is intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the SpiroUSB can help
prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the SpiroUSB as
recommended below, according to the maximum output power of the communications
equipment
Rated Maximum
Output Power of
Transmitter in
Watts (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.
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
Separation Distance in Meters (m) according to
Frequency of Transmitter
150 KHz to
80 MHz
d = 1.2√P
0.12
0.38
1.2
3.8
12
80 MHz to
800 MHz
d = 1.2√P
0.12
0.38
1.2
3.8
12
34
800 MHz to
2.5 GHz
d = 2.3√P
0.23
0.73
2.3
7.3
23