Installation Manual

Configuration
3M™ Drive-Thru Systems G5 Basestation Model G5B1
Installation Manual
April 24 2015 – Revision 1.0
Page 55 of 76
• Select 18 Revision Levels .
Backup Intercom Module
Backup module and its functionality will be added later as an Appendix as we
did with Greeter and Timer module with XT-1.
Change the Microphone Preamp Gain
The Mic Preamp Gain is the first stage of amplification from the microphone in
the order point. In order to optimize the base station to a specific site this level
must be precisely set.
To change the microphone preamp gain:
• Lookup the microphone’s output level at 1kHz sensitivity (see the
microphone’s specifications).
• Enter the configuration mode, see page 34.
• Select a new value for 01 Drivethru Volume > Mic Preamp
Gain . The range is 0 to 20. Use the table below to determine the
correct setting.
Microphone Output Level
Setting
Microphone Output Level
Setting
-63 dB 0 -74 dB 11
-64 dB 1 -75 dB 12
-65 dB 2 -76 dB 13
-66 dB 3 -77 dB 14
-67 dB 4 -78 dB 15
-68 dB 5 -79 dB 16
-69 dB 6 -80 dB 17
-70 dB 7 -83 dB 18
-71 dB 8 -84 dB 19
-72 dB 9 -85 dB 20
-73 dB 10
For example, according to its specifications, the 3M™ Duplex Microphone (78-
6911-4935-1) has an output level of -71dB at 1 kHz. According to the table, the
setting in the base station should be 8.
Note:
Due to slight microphone variability and cable impedance, you may need to
adjust the gain level setting by 1 or 2 dBs.
Installer Access
The default installer passcode is 12345.