Installation Manual

Table Of Contents
48
Installation Instructions G5 Release A
Press
Enter
.
W.
Check the Revision Levels
Perform the following procedure to view the revision levels and serial numbers of your basestation:
Enter the configuration mode, see “Enter Configuration Mode” on page 28, and choose
1 System Menu
.
Select
18 Revision Levels
.
X.
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 basestation 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 37.
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
PAR
Duplex Microphone (78-6911-4935-1) has an output level of
-71dB at 1 kHz. According to the table, the setting in the basestation should be 8.
IMPORTANT NOTE
Due to slight microphone variability and cable impedance, you may need to adjust the gain level setting by 1 or
2 dBs.
Y.
Installer Access
The default installer passcode is 12345.