User manual

Wavecom GSM Modem

This confidential document is the property of WAVECOM and may not be copied or circulated without permission

3.11. Gain control +VGR, +VGT

This command shall be used by the application to tune the receive gain

of the speaker and transmit gain of the microphone. The application shall

send

AT+VGR=<val> for the receive gain AT+VGT=<val> for the transmit gain

0 to 15 +6 db 0 to 31 +14 db

16 to 31 +4 db 32 to 63 +17 db

32 to 47 +2 db 64 to 95 +20 db

48 to 63 0 db 96 to 127 +23 db

64 to 79 -2 db 128 to 159 +26 db

80 to 95 -4 db 160 to 191 +29 db

96 to 111 -6 db 192 to 223 +32 db

112 to 127 -8 db 224 to 255 +35 db

128 to 143 -10db

144 to 159 -12 db

160 to 175 -14 db

176 to 191 -16 db

192 to 207 -18 db

208 to 223 -20db

224 to 239 -22 db

240 to 255 -24 db

16 levels for receive gain are provided and 8 levels for transmit gain.

Application to GSM AT+VGR=25

GSM to application OK command valid

Application to GSM AT+VGT=45

GSM to application OK command valid