b) Audio Wiring Needed for DVR Recorder
a) Typical Audio Wiring before DVR Installation
As mentioned earlier, the DVR needs to go in
series
with the headset
audio, much like an in-line filter. The most straightforward way to do this
is to disconnect the wire already at the tip connector of the pilot’s head-
phone jack and connect it to DVR Pin 14.
Next, connect DVR Pin 7 to the pilot’s headphone jack Tip, and connect
DVR Pin 1 to the pilot’s headset jack Sleeve and to avionics ground.
NOTE: It is important to have a common ground between audio signals. Some
older aircraft audio systems may not be properly referenced to ground.
In rare cases, an audio isolation transformer may be needed if garbled
audio is heard through the DVR. Consult the factory for details.
1
4
Fig.
2
- Audio Wiring for
Mono
System
(Position ‘C’- page 10)
