Bose A20 manual Details on making the connections, Helicopter U174 connection diagram

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INSTALLATION

Helicopter (U174) connection diagram

WHT/BLU

6 MIC LO

 

WHT

5

MIC HI

 

BLU

 

4

COMM R

 

WHT

 

3

COMM L

 

BLK

 

2

GND

10-32 RED

1

V+IN

V DC

1/2A

 

 

Existing single 4-

 

prong jack

 

Existing wiring to

 

 

Barrel

helicopter intercom/

 

 

 

 

(audio gnd)

audio panel

 

 

 

 

 

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/

MIC LO: Microphone/Lo-ground. Connect to the portion of

 

Blue

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.

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Contents A20 Aviation Headset Safety Information Important Safety InstructionsContents Troubleshooting Operational advisory Volume control Hearing safetyUsing audio sources Recognizing aircraft soundsEarcup inner screen Headset earcup requirementsIntroduction What’s includedWhat’s in the carton Headset assemblyControl module variations Bluetooth control module Conventional control moduleBattery powered options Dual powered options Power and cable variationsAttaching the microphone assembly Microphone assemblyOpening the battery compartment Battery compartmentOperation switches To change the operation switchesAuto Off functionality Inserting and replacing the batteriesTo insert or replace the batteries Using the 6-pin plug Connecting the headset to the aircraftTo connect the headset To disconnect the headsetUsing other plug types Using the dual general aviation plugsMicrophone placement Wearing and adjusting the headsetConditions related to fit Clothing clips Power button Using the control moduleIndicator color Power source Type of light Indicates Power indicatorAudio priority Auxiliary AUX audio inputMultifunction/audio priority switch has three positions Multifunction/Audio priority switchPairing the headset with your phone Using the headset With a Bluetooth-enabled phoneReconnecting to a previously connected phone Bluetooth indicator light statusRecovering a lost connection Disconnecting a Bluetooth technology-enabled phoneTo clear pairing device history from the headset Bluetooth volume controlMaking and answering calls General cleaning Cleaning the headsetInstructions for airworthiness Headset earcup openingsMicrophone windscreen replacement Replacing partsMicrophone windscreen Headband cushionBattery replacement Ear cushion replacementReplacing the ear cushions Microphone assembly or access cover replacement Headband cushion replacementStorage Noise Reduction Case of difficultyCommunications Audio Auxiliary audio input Auto off Bluetooth wireless technologyMounting the aircraft panel connector Stereo connection diagram Mono connection diagramDetails on making the connections Helicopter U174 connection diagramTechnical Information Condition Category FAA Technical Standards OrderLimited warranty service WarrantyLocating the headset serial number To return your headset to Bose for repairContact information Ordering parts and accessoriesService and Warranty Information

A20 specifications

The Bose A20 Aviation Headset is a remarkable piece of technology designed specifically for aviators and aviation enthusiasts. Since its release, it has garnered a reputation for delivering superior sound quality, comfort, and durability. Manufactured by the well-known audio company Bose, this headset integrates cutting-edge features that enhance the flying experience for pilots and passengers alike.

At its core, the Bose A20 boasts advanced noise cancellation technology. It employs an active noise reduction system that effectively eliminates unwanted ambient noise, allowing users to concentrate on their surroundings and communication without distractions. This feature is especially crucial in the noisy environment of an aircraft cockpit, where engine noise levels can be overwhelming. The A20 significantly reduces this noise, enhancing clarity during radio transmissions.

The headset also offers excellent audio performance. With clear and balanced sound reproduction, the A20 ensures that every communication and audio alert is heard without distortion. This is complemented by integrated Bluetooth technology, which enables wireless connectivity to mobile devices. Pilots can easily stream music or receive phone calls while keeping their hands free, further enhancing the headset's functionality.

Comfort is another hallmark of the Bose A20. The headset is designed for long-duration wear, featuring plush ear cushions and a lightweight construction. The adjustable headband allows for a customized fit, minimizing fatigue even during extended flights. Additionally, the A20 is built to withstand the rigors of aviation use, with rugged materials that ensure longevity.

Another standout characteristic is the intuitive controls and design. The headset is user-friendly, with simple buttons that allow pilots to adjust noise cancellation levels and manage Bluetooth connections effortlessly. Furthermore, the inclusion of a detachable audio cable adds versatility, making it compatible with various aircraft and devices.

In conclusion, the Bose A20 Aviation Headset is a top choice for pilots seeking an exceptional combination of sound quality, advanced noise reduction, comfort, and user-friendly features. Its innovative technology and thoughtful design make it a vital tool for anyone serious about aviation, ensuring a more enjoyable and productive flying experience. Whether in a small general aviation aircraft or a larger commercial cockpit, the A20 stands out as a leader in the aviation headset market.