Widex USB LINK, User Instructions

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Recommended separation distances
recommended separation distances between portable and mobile rF communication equipment
and the USB Link.
The USB Link is intended for use in the electromagnetic environment in which rF disturbances are
controlled. The customer or the user of the USB Link can help prevent electromagnetic interfer-
ence by maintaining a minimum distance between portable and mobile rF communications
equipment (transmitters) and the USB Link as recommended below, according to the maximum
output power of the communications equipment.
Rated maximum out-
put power of trans-
mitter
W
Separation distance according to
frequency of transmitter
m
150 kHz to
80 MHz
d = 1.2
√
P
80 MHz to
800 MHz
d = 1.2
√
P
800 MHz to
2.5 GHz
d = 2.3
√
P
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
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 transmit-
ter in watts (W) according to the transmitter manufacturer.
noTE 1 At 80 mHz and 800 mHz, 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.
This USB Link may be interfered with by other equipment even if that other equipment complies
with cISpr emission requirements.