Specifications

AT Command Set Reference
Ver. 1.00
GSM1308AT001 Page 212 Ver. 1.00 – 10/29/2008
4.3.3. $PREAMP Set Uplink Voice Parameters
Command Function This command allows the user to enter
uplink voice specific parameters for the
current voice mode (see $vselect).
Command Functional Enfora Specific
Group
Command Format Query AT$PREAMP=?
Response $PREAMP: (0-1), (0-24), (0,1)
OK
Write Format AT+PREAMP=<bias>, <gain>,<extra
Response gain>
OK
Read Format AT$PREAMP?
Response $PREAMP: <bias>,<gain>,<extra gain>
Execution Format N/A
Response N/A
Parameter Values
< bias > 0=> 2v.
1=> 2.5v.
< gain > The value of the gain follows:
0 => -12 dB
1 => -11 dB
2 => -10 dB
3 => -9 dB
. . .
21 => 9 dB
22 => 10 dB
23 => 11 dB
24 => 12 dB
< extra gain > 0 => 28.2 dB.
1 => 4.6 dB.