Bose A20 Aviation 2015-present Owner's guide - Page 37

Helicopter (U174) connection diagram, Details on making the connections

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Helicopter (U174) connection diagram WHT/BLU 6 MIC LO WHT 5 MIC HI BLU 4 COMM R WHT BLK 10-32 RED V DC 1/2A 3 2 1 COMM L GND V+IN Existing single 4prong jack Existing wiring to helicopter intercom/ audio panel Barrel (audio gnd) Technical Information Note: Barrel ground (gnd) refers to aircraft grounds. Details on making the connections The pinouts for the optional installed connector are detailed in the table below: Pin number Color Purpose 1 Red V+IN: Headset power (10-32 VDC). Use a 1/4 amp fuse or a 1/2 amp circuit breaker. 2 Black GND: System ground. Connect to the existing audio ground. 3 White COMM L: Phone communication: Left. 4 Blue COMM R: Phone communication: Right. Note: For stereo operation, connect the left and right channels to their respective positions. For monaural operation, connect pins 3 and 4 together, and to the tip of the existing phone jack. 5 White MIC HI: Microphone/Hi-audio. Connect to the portion of the existing microphone jack that corresponds to the ring position of a headset microphone plug. Do not connect to the tip (PTT) segment. 6 White/Blue MIC LO: Microphone/Lo-ground. Connect to the portion of the microphone jack that corresponds to the barrel position of a headset microphone plug. Note: If the microphone works on radio transmit but not through the intercom, check pin 6. It may be incorrectly wired to the PTT segment of the microphone jack. Comm Shield Black Shield from Comm L and Comm R wire pair. Mic Shield Black Shield from Mic Hi and Mic Lo wire pair. Note: The wires connecting pins 3 and 4 and pins 5 and 6 are shielded, twisted pairs with a black wire shield termination exiting each pair. If the existing wiring is not shielded, connect the shields to the existing audio wiring shields, or connect the shield from Comm L and Comm R wire pair to audio ground. English - 37

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Technical Information
English - 37
Helicopter (U174) connection diagram
Barrel
(audio gnd)
Existing single 4-
prong jack
Existing wiring to
helicopter intercom/
audio panel
10-32
V DC
6
MIC LO
5
MIC HI
4
COMM R
3
COMM L
2
GND
1
V+IN
1/2A
WHT/BLU
WHT
BLU
WHT
BLK
RED
Note:
Barrel ground (gnd) refers to aircraft grounds.
Details on making the connections
The pinouts for the optional installed connector are detailed in the table below:
Pin number
Color
Purpose
1
Red
V+IN: Headset power (10-32 VDC). Use a 1/4 amp fuse or
a 1/2 amp circuit breaker.
2
Black
GND: System ground. Connect to the existing audio
ground.
3
White
COMM L: Phone communication: Left.
4
Blue
COMM R: Phone communication: Right.
Note:
For stereo operation, connect the left and right channels to their respective posi-
tions. For monaural operation, connect pins 3 and 4 together, and to the tip of the existing
phone jack.
5
White
MIC HI: Microphone/Hi-audio. Connect to the portion of
the existing microphone jack that corresponds to the ring
position of a headset microphone plug. Do not connect to
the tip (PTT) segment.
6
White/Blue
MIC LO: Microphone/Lo-ground. Connect to the portion
of the microphone jack that corresponds to the barrel
position of a headset microphone plug.
Note:
If the microphone works on radio transmit but not through the intercom, check pin 6.
It may be incorrectly wired to the PTT segment of the microphone jack.
Comm Shield
Black
Shield from Comm L and Comm R wire pair.
Mic Shield
Black
Shield from Mic Hi and Mic Lo wire pair.
Note:
The wires connecting pins 3 and 4 and pins 5 and 6 are shielded, twisted pairs with
a black wire shield termination exiting each pair. If the existing wiring is not shielded,
connect the shields to the existing audio wiring shields, or connect the shield from
Comm L and Comm R wire pair to audio ground.