Sierra Wireless MC5725 Hardware Integration Manual page 92

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
Note: Diversity is not available in
GSM mode.
Note: Setup of the DUT is the
same as in Step
change to AT!DAWGAVGAGC
and the addition of
AT!DAWSSCHAIN.
92
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
3.
Note: The value measured from the DUT is significantly influenced by
the test setup and DUT design (host RF cabling loss, antenna
efficiency and pattern, test antenna efficiency and pattern, and choice
of shield box).
4.
2, except for a
Proprietary and Confidential
· See Table 8‐2 for <channel> values
AT!DASLNAGAIN=0
(sets the LNA to maximum gain)
e.
(WCDMA mode)
f.
AT!DAWGAVGAGC=9400,0
i.
9400 as an example)
(GSM mode)
AT!DAGSRXBURST=0
i.
AT!DAGGAVGRSSI=190,0
ii.
example)
The returned value is the RSSI in dBm.
Test limits:
Run ten or more good DUTs through this test proce‐
dure to obtain a nominal received power value.
· Apply a tolerance of
(assuming a good setup design).
· Make sure the measurement is made at a high enough
level that it is not influenced by DUT‐generated and
ambient noise.
· The Signal Generator power level can be adjusted and
new limits found if the radiated test needs greater
signal strength.
· Monitor these limits during mass‐production ramp‐up
to determine if further adjustments are needed.
Test diversity paths for the MC8780 (WCDMA 850 /
WCDMA 2100), MC8781 (WCDMA 850 / WCDMA 1900),
or MC8785V / M C8790 / M C8790V (WCDMA 850 /
WCDMA 1900 / WCDMA 2100):
a. Set up the signal generator as in Step 1.
b. Set up the DUT:
AT!UNLOCK
i. ="<customerCode>" or
AT!DAFTMACT
ii.
AT!DASBAND=<band>
iii.
· See Table 8‐2 for <band> values
AT!DAWSSCHAIN=1
iv.
AT!DASCHAN=<channel>
v.
· See Table 8‐2 for <channel> values
AT!DASLNAGAIN=0
vi.
(for PCS1900, channel
(set to receive bursted mode)
(for channel 190, for
±
5 to 6 dB to each measurement
AT!ENTERCND
(enables the secondary chain)
(sets the LNA to maximum gain)
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