Product Technical Specification & Customer Design Guidelines
82
Proprietary and Confidential - Contents subject to change
2400089
d.
AT!DASCHAN=<channel>
(Set modem channel)
·
See
for <channel> values
e.
AT!DALGAVGAGC=<channel>,0
(Get averaged Rx AGC)
·
See
for <channel> values
3.
Test limits — Run ten or more good DUTs through this test procedure to
obtain a nominal received power value.
·
Apply a tolerance of
5 to 6 dB to each measurement (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.
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).
GPS standalone connector test
GPS testing should be done on devices that support a dedicated GPS connector.
If the MC7710 supports a dedicated GPS connector/path (that is, not shared with
the diversity connector), then GPS testing may be done by characterizing some
known-good MC devices and checking for carrier to noise levels.
To test the GPS path:
1.
Inject a carrier signal at -110dBm, frequency 1575.52 MHz into the GPS Rx
path. (Note that this is 100kHz higher than the actual GPS frequency.)
2.
Test the signal carrier-to-noise level at the GPS receiver:
a.
AT!ENTERCND
(Unlock extended AT command set.)
b.
AT!DAFTMACT
(Put modem into factory test mode.)
c.
AT!DACGPSTESTMODE=1
(Start CGPS diagnostic task.)
d.
AT!DACGPSSTANDALONE=1
(Enter standalone RF mode.)
e.
AT!DACGPSMASKON
(Enable log mask.)
f.
AT!DACGPSCTON
(Return signal-to-noise and frequency measurements.)
g.
Repeat
AT!DACGPSCTON
five to ten times to ensure the measurements
are repeatable and stable.
3.
Leave the RF connection to the Mini Card device intact, and turn off the
signal generator.
4.
Take several more
!DACGPSCTON
readings. This will demonstrate a 'bad'
signal in order to set limits for testing, if needed. This frequency offset should
fall outside of the guidelines in the note below, which indicates that the CtoN
result is invalid.
