Jupiter Avionics JB39-401 User manual

Rev B Page i
JB39-401 Low Impedance Headset Adapter
5 Ohm Mic - 8 Ohm Phones - 4 Channel
Installation Manual
Rev A
Jupiter Avionics Corporation
1959 Kirschner Road
Kelowna BC
Canada V1Y 4N7
Tel: [phone]
Toll-Free: 1 855 478 2232
www.jupiteravionics.com

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
Rev A Page ii
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.
RECORD OF REVISIONS
Revision
Rev Date
Description
ECR
A
Mar 2023
Initial release, Serial number 1001 and higher.
5515
Prepared:
MPB
Checked:
Approved:
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
JAC
DB
05-18-23 JAC
KDV
05-18-23

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
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Table of Contents
SECTION 1 - DESCRIPTION ................................................................................................................................................. 1
1.1 System Overview .................................................................................................................................................... 1
1.2 Features Overview .................................................................................................................................................. 1
1.3 Inputs and Outputs .................................................................................................................................................. 1
1.3.1 Inputs............................................................................................................................................................... 1
1.3.2 Outputs ............................................................................................................................................................ 1
1.3.3 Audio Performance.......................................................................................................................................... 2
1.3.4 Audio Performance, Other .............................................................................................................................. 2
1.4 Specifications .......................................................................................................................................................... 3
1.4.1 Electrical Specifications................................................................................................................................... 3
1.4.2 Mechanical Specifications ............................................................................................................................... 3
SECTION 2 – INSTALLATION............................................................................................................................................... 4
2.1 Introduction.............................................................................................................................................................. 4
2.2 Continued Airworthiness ......................................................................................................................................... 4
2.3 Unpacking and Inspecting Equipment..................................................................................................................... 4
2.3.1 Warranty .............................................................................................................................................................. 4
2.4 Installation Procedures............................................................................................................................................ 4
2.4.1 Installation Limitations ......................................................................................................................................... 4
2.4.2 Cabling and Wiring .............................................................................................................................................. 4
2.4.3 Mechanical Installation ........................................................................................................................................ 5
2.4.4 Post Installation Checks ...................................................................................................................................... 5
2.5 System Operation.................................................................................................................................................... 5
2.5.1 Microphone Operation..................................................................................................................................... 5
2.5.2 Phones Operation ........................................................................................................................................... 5
2.6 Installation Kit .......................................................................................................................................................... 5
2.7 Installation Drawings ............................................................................................................................................... 6
Appendix A - Installation Drawings...................................................................................................................................A1
A1 Introduction............................................................................................................................................................A1
A2 Installation Drawings .............................................................................................................................................A1

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JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
SECTION 1 - DESCRIPTION
1.1 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 phones audio from the audio controller passes through the JB39-401 to provide connector
compatibility with other models in the JB39 family.
1.2 Features Overview
The JB39-401 is a compact bulkhead mount product in a metal enclosure to shield the circuitry from
Radio Frequency Interference.
1.3 Inputs and Outputs
Refer to the JB39-401 connector maps for the mating connector designators and pin assignments for the
input and output signals.
1.3.1 Inputs
Name
Qty
Type
USER 1 MIC INPUT HI/LO
2
Low impedance audio signal
USER 2 MIC INPUT HI/LO
2
Low impedance audio signal
USER 3 MIC INPUT HI/LO
2
Low impedance audio signal
USER 4 MIC INPUT HI/LO
2
Low impedance audio signal
USER 1 PHONES INPUT HI/LO
2
Phones audio input
USER 2 PHONES INPUT HI/LO
2
Phones audio input
USER 3 PHONES INPUT HI/LO
2
Phones audio input
USER 4 PHONES INPUT HI/LO
2
Phones audio input
1.3.2 Outputs
Name
Qty
Type
USER 1 MIC OUTPUT HI/LO
2
High impedance mic audio output
USER 2 MIC OUTPUT HI/LO
2
High impedance mic audio output
USER 3 MIC OUTPUT HI/LO
2
High impedance mic audio output
USER 4 MIC OUTPUT HI/LO 2
High impedance mic audio output
USER 1 PHONES OUTPUT HI/LO
2
Phones audio output
USER 2 PHONES OUTPUT HI/LO
2
Phones audio output
USER 3 PHONES OUTPUT HI/LO
2
Phones audio output
USER 4 PHONES OUTPUT HI/LO
2
Phones audio output

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
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1.3.3 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
1.3.4 Audio Performance, Other
Microphone input circuitry type single ended
Phone input circuitry type differential

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
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1.4 Specifications
1.4.1 Electrical Specifications
Power nominal voltage (Mic Bias) 12.0 Vdc
Maximum bias voltage 16.0 Vdc
Minimum bias voltage 10.0 Vdc
Input current at 12 Vdc 12 mA max
1.4.2 Mechanical Specifications
Height 2.13 in [54.1 mm] max
Depth (not including connectors) 2.02 in [51.3 mm] max
Width 4.52 in [114.8 mm] max
Weight 0.58 lb. [0.26 kg] max
Installation Kit weight 0.10 lb [0.044 kg] max.
Material 5052-H32 aluminum
Finish brushed with conversion coating
Connectors: J1 One 9 pin D-sub male, jack posts
J2 One 9 pin D-sub male, jack posts
J3 One 9 pin D-sub male, jack posts
J4 One 9 pin D-sub male, jack posts
Mounting 4 x 10-32 fasteners
Bonding ≤ 2.5 mΩ
Installation Kit INST-JB394x

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JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
SECTION 2 – INSTALLATION
2.1 Introduction
This section contains unpacking and inspection procedures, installation information, and post-installation checks.
2.2 Continued Airworthiness
Maintenance of the JB39-401 is on condition only. Scheduled inspection and/or periodic maintenance of this unit is
not required.
2.3 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 on-line warranty card from the Jupiter Avionics
Corporation (JAC) website – www.jupiteravionics.com/warrantyregistration.
2.3.1 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 labour 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 on-line 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.
2.4 Installation Procedures
WARNING: Loud noise can cause hearing damage. Set audio system headset volumes to minimum
before conducting tests, and slowly increase the volume to a comfortable listening level.
2.4.1 Installation Limitations
The JB39 may be installed only by following the applicable airworthiness requirements.
2.4.2 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer’s maintenance instructions, or AC43.13-
1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to 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 in accordance with the original aircraft manufacturer’s maintenance
instructions.

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
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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.
2.4.3 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.
2.4.4 Post Installation Checks
2.4.4.1 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.
2.4.4.2 Configuration
The JB39 has no configuration options.
2.4.4.3 Power on Checks.
Power up the aircraft’s systems and confirm operation of all functions of the JB39.
a) Begin with a low impedance headset attached. Confirm correct operation for both Mic and phones 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.
2.5 System Operation
2.5.1 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 current as an input to the USER MIC OUTPUT.
2.5.2 Phones Operation
The JB39-401 routes the USER PHONES INPUT audio directly to the USER PHONES OUTPUT.
2.6 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:
Quantity Description JAC Part #
4 D-Sub 9-pin crimp socket housing CON-3460-0009
4 D-Sub 9-pin crimp socket hoods CON-5300-0109
36 20 to 24 AWG D-Subminiature - Crimp Socket CON-3320-2024M
4 0.375" Inside Diameter - Tag Ring CON-5500-0375
4 3/4" Inside Diameter - Black, Heat Shrink Tube WIR-HTSK-0750

JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
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2.7 Installation Drawings
The drawings and documents required for Installation can be found in Appendix A of this manual.

Rev A Page A1
JB39-401 Low Impedance Headset Adapter - 5 ΩMic - 8 ΩPhones - 4 Channel
Installation Manual
Appendix A - Installation Drawings
A1 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
DOCUMENT Rev
JB39-401 Connector Map A
JB39-401 Interconnect A
JB39-401 Mechanical Installation A
JB39-401 Equipment Block Diagram A