Sierra Wireless MC8775 Reference Manual page 73

Table 5-2: Test command details (Continued)
Command
!DASPDM
=<PDM ID>,<PDMvalue>
Supporting Mini Cards:
•
All
Note: The modem must be in
FTM mode to use this
command—use
AT!DAFTMACT to enter FTM
mode.
!DASTXOFF
Supporting Mini Cards:
•
All
Note: The modem must be in
FTM mode to use this
command—use
AT!DAFTMACT to enter FTM
mode.
Rev 2.9 Oct.08
Set the PDM value
This command adjusts the PDM (Pulse Duration Modulation), allowing you
to apply frequency offset to the LO (Local Oscillator).
Parameters:
<PDM ID> (the LO (Local Oscillator) or Tx AGC (Automatic Gain Control) to
adjust):
• 0 = Tracking LO adjust (GSM only)
•
2 = TX AGC adjust (WCDMA only)
• 4 = Tracking LO adjust (WCDMA only)
<PDMvalue> (the frequency offset value):
• If <PDM ID> = 0, 0 to 511
• If <PDM ID> = 2, 0 to 511
•
If <PDM ID> = 5, 0 to 65536
When you adjust the TX AGC (<PDM ID>=2), the modem does not use a
calibrated result but uses the raw AGC value. The resulting change in TX
power will vary from modem to modem, so it is usually necessary to tune
this value, executing the command repeatedly with different settings for the
<PDMvalue> until you obtain the desired TX power.
When adjusting the tracking LO, you also need to execute the command
repeatedly with different settings for the <PDMvalue> until you obtain the
desired frequency offset.
Note: AT!DASBAND and AT!DASCHAN must be called before you can
use !DASPDM.
Turn the TX PA off
This command turns the transceiver PA off, after it has been turned on with
!DASTXON.
Note: AT!DASBAND and AT!DASCHAN must be called before you can
use !DASTXOFF.
Test Commands
Description
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