Widex USB LINK - Page 27

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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