Sierra Wireless MC5725 Hardware Integration Manual page 46

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
46
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Sensitivity test results — MC57xx
Figure 3‐3 shows typical test results for the US PCS band for
both conducted and over‐the‐air connections. The conducted
(or ʺconnectorizedʺ) measurements were made using an RF
coaxial cable connection. The over‐the‐air measurements were
made using both an external antenna and a typical device
antenna.
Figure 3-3: US PCS sensitivity measurements
In this test, the external antenna performed best — the
expected result if a high efficiency antenna with some gain is
used. The internal antenna has less gain than the external
antenna, so the internal antennaʹs performance is offset above
the external antenna. The antenna gain must be known to
determine whether the offset is strictly the result of antenna
gain or if broadband desense is present. Narrowband desense
can be seen at channels 325, 625, and 925.
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