Sierra Wireless AirPrime MC7710 Product Technical Specification & Customer Design Manuallines page 80

Product Technical Specification & Customer Design Guidelines
Note: Diversity is not
available in GSM mode.
Note: Setup of the DUT is
the same as in Step 2,
except for a change to
AT!DAWGAVGAGC and
the addition of
AT!DAWSSCHAIN.
80 Proprietary and Confidential - Contents subject to change
2. Set up the DUT:
AT!ENTERCND
a.
AT!DAFTMACT
b.
AT!DASBAND=<band>
c.
· See Table C-2 on page 79
AT!DASCHAN=<channel>
d.
· See Table C-2 on page 79
AT!DASLNAGAIN=0
e.
f. (WCDMA mode)
AT!DAWGAVGAGC=9400,0
i.
example.)
(GSM mode)
AT!DAGSRXBURST=0
ii.
AT!DAGGAVGRSSI=190,0
iii.
The returned value is the RSSI in dBm.
3. Test limits — Run ten or more good DUTs through this test procedure to
obtain a nominal received power value.
· Apply a tolerance of
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.
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. Test diversity paths:
a. Set up the signal generator as in
b. Set up the DUT:
AT!ENTERCND
i.
AT!DAFTMACT
ii.
AT!DASBAND=<band>
iii.
· See Table C-2 on page 79
AT!DAWSSCHAIN=1
iv.
AT!DASCHAN=<channel>
v.
· See Table C-2 on page 79
AT!DASLNAGAIN=0
vi.
AT!DAWGAVGAGC=9400,0,1
vii.
used.)
c. Test the limits as in
(Unlock extended AT command set.)
(Put modem into factory test mode.)
(Set frequency band.)
for <band> values
(Set modem channel)
for <channel> values
(Set the LNA to maximum gain.)
(For PCS1900, channel 9400 as an
(Set to receive bursted mode.)
(For channel 190, for example.)

5 to 6 dB to each measurement (assuming a good
Step 1.
(Unlock extended AT command set.)
(Put modem into factory test mode.)
(Set frequency band.)
for <band> values
(Enable the secondary chain.)
(Set modem channel)
for <channel> values
(Set the LNA to maximum gain.)
(The '1' indicates the diversity path is
Step 3.
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