Jupiter Avionics JB39-401 Low Impedance Headset Adapter Instruction Manual

Jupiter Avionics JB39-401 Low Impedance Headset Adapter

Product Information

Specifications

• Model: JB39-401
• Impedance: Low
• Mic Impedance: 5 Ohm
• Phones Impedance: 8 Ohm
• Channels: 4

Product Description

The JB39-401 is a compact bulkhead mount product in a metal enclosure designed to shield the circuitry from Radio Frequency Interference (RFI).

Features Overview

• Compact design
• Bulkhead mount
• Metal enclosure for RFI protection

Inputs and Outputs

Refer to the JB39-401 connector maps for the mating connector designators and pin assignments for the input and output signals.

Inputs

Outputs

Audio Performance

• Rated Input Level:
  • USER Phone’s input level
  • USER Microphone input level
• Rated Output Level:
  • USER Phones rated output
  • USER microphone-rated output
• Audio Frequency Response:
  • USER Phones audio frequency response
  • USER Microphone audio frequency response
• Distortion Characteristics:
  • Audio output distortion at rated power
  • Audio output distortion at 10% of rated power
• Input Impedance:
  • Phones input impedance
  • Microphone input impedance
• Output Impedance:
  • Phones output impedance
  • Microphone output impedance
• Output Load Impedance:
  • Phones Output load impedance
  • Microphone Output load impedance
• Audio Noise Level without Signal:
  • Noise level below the rated output by
• Audio Performance, Other:
  • Microphone input circuitry type
  • Phone input circuitry type

Product Usage Instructions

Installation

Follow the steps below to install the JB39-401 Low Impedance Headset Adapter:

1. Locate a suitable bulkhead mount location.
2. Ensure the metal enclosure is properly grounded.
3. Connect the appropriate input and output signals to their respective connectors on the JB39-401.
4. Tighten the connectors securely.

FAQ

Q: Can I use the JB39-401 with high-impedance microphones?

• A: No, the JB39-401 is designed for use with low-impedance microphones only.

Q: What is the audio frequency response of the JB39-401?

• A: The audio frequency response of the JB39-401 is 3 dB from 300 to 6000 Hz.

Copyright 2023 Jupiter Avionics Corp.

• All rights reserved
• Jupiter Avionics Corporation (JAC) permits a single copy of this manual to be printed or downloaded for the express use of an installing agency. Any such electronic or printed copy of this manual must contain the complete text of this copyright notice.
• Any unauthorized commercial distribution of this manual is strictly prohibited.
• Except as described above, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded, or stored in any storage medium for any purpose without the express prior written consent of JAC.

IMPORTANT:

• Information in this document is subject to change without notice.
• To confirm the current revision status of this manual, visit the JAC website: www.jupiteravionics.com

DESCRIPTION

System Overview

• The JB39-401 Low Impedance Headset Adapter – 5 Ohm Mic – 8 Ohm Phones – 4 Channel allows four low impedance headsets to be used with a civilian aviation audio controller.
• The JB39-401 operates using the microphone bias supply of the audio controller and requires no other external power.
• The phone’s audio from the audio controller passes through the JB39-401 to provide connector compatibility with other models in the JB39 family.

Features Overview

• The JB39-401 is a compact bulkhead mount product in a metal enclosure to shield the circuitry from Radio Frequency Interference.

Inputs and Outputs

• Refer to the JB39-401 connector maps for the mating connector designators and pin assignments for the input and output signals.

Inputs

Outputs

Audio Performance

Rated Input Level

• USER Phones input level 7.75 Vrms ± 10%
• USER Microphone input level 250 uVrms ± 10%

Rated Output Level

• USER Phones rated output 1.6 Vrms ± 10%
• USER Microphone rated output 250 mVrms ± 10%

Audio Frequency Response

• USER Phones audio frequency response ≤ 3 dB from 300 to 6000 Hz
• USER Microphone audio frequency response ≤ 3 dB from 300 to 6000 Hz

Distortion Characteristics

• Audio output distortion at rated power ≤ 10%
  Audio output distortion at 10% of rated power ≤ 3%

Input Impedance

• Phones input   impedance 150 Ω ± 10%
• Microphone input impedance 10 Ω ± 10%

Output Impedance

• Phones output impedance 8 Ω ± 20%
• Microphone output impedance 150 Ω ± 10%

Output Load Impedance

• Phones Output load impedance 8 Ω ± 10%
• Microphone Output load impedance 150 Ω ± 10%

Audio Noise Level without Signal

• Noise level below the rated output by ≥ 50 dB

Audio Performance, Other

• Microphone input circuitry type single-ended
• Phone input circuitry type differential

Specifications

INSTALLATION

Introduction

• This section contains unpacking and inspection procedures, installation information, and post-installation checks.

Continued Airworthiness

• Maintenance of the JB39-401 is on condition only. Scheduled inspection and/or periodic maintenance of this unit is not required.

Unpacking and Inspecting Equipment

• Unpack the equipment carefully. Check for shipping damage and report any problems to the relevant carrier. Confirm that the Certificate of Conformance is included.
• Complete the online warranty card from the Jupiter Avionics Corporation (JAC) website – www.jupiteravionics.com/warrantyregistration.

Warranty

• All JB39 products manufactured by JAC are warranted to be free of defects in workmanship or performance for 2 years from the date of purchase from an approved JAC dealer or agency. This warranty covers the cost of all materials and labor to repair or replace the unit but does not include the cost of transporting the defective unit to and from JAC or its designated warranty repair centre, or of removing and replacing the defective unit in the aircraft. This warranty does not cover failures due to abuse, misuse, accident, or unauthorized alteration or repairs.
• If the online warranty card is not completed, the product will be warranted from the date of manufacture.
• Contact JAC for return authorization, and for any questions regarding this warranty and how it applies to your unit(s).
• JAC is the final arbiter concerning warranty issues.

Installation Procedures

• WARNING: Loud noise can cause hearing damage. Set audio system headset volumes to a minimum before conducting tests, and slowly increase the volume to a comfortable listening level.

Installation Limitations

• The JB39 may be installed only by following the applicable airworthiness requirements.

Cabling and Wiring

• All wires shall be selected under the original aircraft manufacturer’s maintenance instructions, or AC43.13- 1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify for MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with tag ring or equivalent (for shield terminations) to make the most compact and easily terminated interconnect.
• Follow the Connector Map in Appendix A of this manual.
• Allow 3” from the end of the shielded wiring to the shield termination to allow the connector hood to be easily installed.
• Refer to the Interconnect drawing in Appendix A of this manual for shield termination details. Note that this unit has a clamshell’ hood that is installed after the wiring is complete.
• Maintain wire segregation and route wiring under the original aircraft manufacturer’s maintenance instructions.
• Unless otherwise noted, all wiring shall be a minimum of 24 AWG, except power and ground lines, which shall be a minimum of 22 AWG. Refer to the Interconnect drawing for additional specifications.
• Check that the ground connection is clean and well secured and that it shares no path with any electrically noisy aircraft accessories such as blowers, turn-and-bank instruments, or similar loads.

Mechanical Installation

• The JB39-401 can be mounted in any attitude and location with sufficient clearance for the connector body.
• It requires no direct cooling.
• Post Installation Checks
• Voltage/Resistance checks.

Do not attach this unit until the following conditions are met:

• a) Check all pins for shorts to ground or adjacent pins.

Configuration

• The JB39 has no configuration options.

Power on Checks.

• Power up the aircraft’s systems and confirm the operation of all functions of the JB39.
• a) Begin with a low-impedance headset attached. Confirm correct operation for both Mic and phone output. Do not proceed until the headsets are functioning correctly.
• b) Unusual buzzes, hums, or other background audio are symptomatic of multiple grounds, or noisy external systems such as blowers or pumps sharing wiring with the audio system.

System Operation

Microphone Operation

• For each user, the JB39-401 amplifies the USER MIC INPUT audio and routes it to the same user’s USER MIC OUTPUT.
• The JB39-401 accepts a MIC BIAS, DC as an input to the USER MIC OUTPUT.

Phones Operation

• The JB39-401 routes the USER PHONES INPUT audio directly to the USER PHONES OUTPUT.

Installation Kit

• The kit required to install this unit is not included with the unit. The installation kit (Part # INST-JB394x) consists of the following:

Installation Drawings

• The drawings and documents required for Installation can be found in Appendix A of this manual.

Appendix A – Installation Drawings

Introduction

• The drawings necessary for installation and troubleshooting of the JB39-401 Low Impedance Headset Adapter -5 Ohm Mic – 8 Ohm Phones – 4 Channel are in this Appendix, as listed below.

A2 Installation Drawings

USER 1 CONNECTOR

JB39-401 INTERCONNECT WIRING NOTES

NOTES

1. ALL WIRE SIZES SHOULD BE 24 AWG MIN UNLESS OTHERWISE SPECIFIED. UNSHIELDED WIRE SHOULD BE SELECTED PER FAA AC43.13-1B CHANGE 1 PARA 11-76 TO 11-78. WIRE TYPES SHOULD BE UNDER MIL-W-22759 AS DESCRIBED IN FAA AC43.13-1B CHANGE 1 PARA 11-85 AND 11-86 AND LISTED IN TABLE 11-11 OR 11-12. ALL SHIELDED CABLES SHOULD BE UNDER MIL-DTL-27500 (REVISION H OR LATER).
2. CONNECTION TO AIRFRAME GROUND SHOULD BE MADE WITH 22 AWG WIRE. LENGTH NOT TO EXCEED 3 FT (1 M).
3. CABLE SHIELDS AT CONNECTOR PINS SHOULD BE TERMINATED TO AIRFRAME GROUND USING A TAG RING P/N: MS27741-5 OR EQUIVALENT.

Jupiter Avionics Corporation
1959 Kirschner Road
Kelowna BC
Canada V1Y 4N7
Tel: +1 778 478 2232
Toll-Free: 1 855 478 2232
www.jupiteravionics.com

Documents / Resources

| Jupiter Avionics JB39-401 Low Impedance Headset Adapter [pdf] Instruction Manual
JB39-401 Low Impedance Headset Adapter, JB39-401, Low Impedance Headset Adapter, Headset Adapter, Adapter
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References

• Jupiter Avionics Corporation - Avionics design manufacturer

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