Chapter 8: Audio Module, Rev 1.1
multi-lead cable back to the VDR-100G3. This central junction box is not provided with the VDR-
100G3.
Each microphone/buzzer unit is connected, via its associated junction box, to the Audio Module.
8.3.2 Audio Module Inputs
The basic Audio Module has 4 channels with 2 inputs each for a total of 8 inputs. Optionally the
Audio Module may be supplied with 6 or 8 channels (12 or 16 inputs respectively).
Inputs to the Audio Module are field configurable and can change to customize a particular
installation. Only the primary VHF being recorded is connected to Channel 1. Once all
microphones have been connected, any additional VHFs can be connected to the first available
free channels.
Note! It is highly recommended that there not be more than 1 VHF connection
on the first eight (8) inputs of the Audio Module.
Example 1: If the primary VHF and 4 microphones have been connected and there are no other
microphones to connect, then any additional VHF may be connected to Channel 4.
Example 2: If the primary VHF and 6 microphones have been connected and there are no other
microphones to connect then any additional VHF may be connected to Channel 5.
The table below illustrates a typical configuration for the basic and the expanded module.
Input 1 VHF Tx/Rx or VHF Tx
Channel 1
Input 2 VHF Rx
Input 3 Internal Mic #1 Channel 2
Input 4 Internal Mic #2
Input 5 Internal Mic #3 Channel 3
Input 6 Internal Mic #4
Input 7 External Mic #1
Base - 8 Input Module
Channel 4
Input 8 External Mic #2
Input 9 VHF(2)Tx/Rx or VHF (2)Tx Channel 5
Input 10 VHF(3) Tx/Rx or VHF(2) Rx
Input 11 Internal Mic #5
Optional - 12-Input Module
Channel 6
Input 12 Internal Mic #6
Input 13 Internal Mic #7 Channel 7
Input 14 Internal Mic #8
Input 15 Internal Mic #9
Optional - 16-Input Module
Channel 8
Input 16 Internal Mic #10
Table 8-2- Audio Module Configuration
Note! It is highly recommended to connect internal microphones in groups (i.e., if
a vessel has 4 internal microphones and 2 external microphones, the internals
should be connected to Input 3-4, and Input 5-6 with the 2 external microphones
connected to Input 7-8).
VDR-100G3/G3S Installation Manual 06/10/2008
8-11
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