Adjusting The Gain - Rutter VDR-100G3 Installation Manual

8.4.2.3
Gain is normally only adjusted for line level inputs such as VHF. For microphone inputs the
factory defaults should be used. Each audio input on the Audio Module may be configured to
accept either line level or microphone inputs. To configure the audio input to accept an input other
than the current factory default setting, it may be necessary to adjust the gain for that audio input.
Refer to Table 8-6 - Recommended Resistance Readings for the recommended resistance
settings for the various inputs types.
Internal Microphones
Outdoor Microphones
VHF
Note: the resistance readings do not have to exactly match these numbers. They are provided
here only as recommendations.
To adjust audio input gain:
1. Remove power to the Audio Module;
2. Locate the audio input potentiometer to be adjusted. Refer to Figure 8-14: Audio Input
Potentiometer Layout to identify the potentiometer that corresponds to the audio input.
3. Connect the multimeter probes to lead 1 and lead 2 of the potentiometer to be adjusted.
Refer to Figure 8-15 – Potentiometer Leads and Figure 8-16 - Potentiometer Lead
Resistance Reading
4. Measure the resistance of the potentiometer associated with the audio input being
adjusted; Refer to Figure 8-14 - Audio Input Potentiometer layout;
1
FRONT
2
BACK
VDR-100G3/G3S Installation Manual
Chapter 8: Audio Module, Rev 1.1

Adjusting the Gain

Recommended Resistance Reading
Table 8-6- Recommended Resistance Readings
4 5 8
3 6 7
Figure 8-14 – Audio Input Potentiometer layout
45k Ohms
45k Ohms
Dependant upon VHF
manufacturer.
9 12 13
10 11 14
8-18
16
15
06/10/2008