User's Manual

Silicon Laboratories Finland Oy
Page 44 of 45
12.6 Qualified Antenna Types for WT41u-E and WT41u-N
This device has been designed to operate with a standard 2.14 dBi dipole antenna. Any antenna of a different
type or with a gain higher than 2.14 dBi is strictly prohibited for use with this device. Using an antenna of a
different type or gain more than 2.14 dBi will require additional testing for FCC, CE and IC. The required
antenna impedance is 50 Ω.
Antenna type
Maximum gain
Dipole
2.14 dBi
Table 18: Qualified Antenna Types for WT41u-E/N
To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that
the equivalent isotropically radiated power (EIRP) is not more than that permitted for successful
communication.
Any standard 2.14 dBi dipole antenna can be used without an additional application to FCC.
12.7 Moisture Sensitivity Level (MSL)
Moisture sensitivity level (MSL) of this product is 3. For the handling instructions please refer to JEDEC J-
STD-020 and JEDEC J-STD-033.
If baking is required, devices may be baked for 12 hours at 125°C +/-5°C for high temperature device
containers.