Jupiter Avionics JA39-001 User manual

Rev
B Page i
JA39-001
Low Impedance Headset Adapter
5 Ohm Mic - 8 Ohm Phones
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
DRAFT

JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
Installation Manual
Rev A Page ii
Copyright 2014 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
Nov 2014
Initial release, Serial number 1001 and higher.
2878
Prepared:
MPB/CPM
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

JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
Installation Manual
Rev A Page iii
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 Mic Bias Voltage Supply .................................................................................................................................1
1.4 Specifications..........................................................................................................................................................2
1.4.1 Electrical Specifications...................................................................................................................................2
1.4.2 Mechanical Specifications...............................................................................................................................2
SECTION 2 – INSTALLATION............................................................................................................................................... 3
2.1 Introduction..............................................................................................................................................................3
2.2 Continued Airworthiness .........................................................................................................................................3
2.3 Unpacking and Inspecting Equipment.....................................................................................................................3
2.3.1 Warranty..............................................................................................................................................................3
2.4 Installation Procedures............................................................................................................................................3
2.4.1 Installation Limitations.........................................................................................................................................3
2.4.2 Cabling and Wiring..............................................................................................................................................3
2.4.3 Mechanical Installation........................................................................................................................................3
2.4.4 In-Line PTT Cordsets..........................................................................................................................................4
2.4.5 Post Installation Checks......................................................................................................................................4
2.5 System Operation....................................................................................................................................................4
2.5.1 Microphone Operation.....................................................................................................................................4
2.5.2 Phones Operation ...........................................................................................................................................4
2.6 Installation Kit..........................................................................................................................................................4
2.7 Installation Drawings...............................................................................................................................................4
Appendix A - Installation Drawings...................................................................................................................................A1
A1 Introduction............................................................................................................................................................A1
A2 Installation Drawings.............................................................................................................................................A1

Rev B Page 1
JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
SECTION 1 - DESCRIPTION
1.1 System Overview
The JA39-001 Low Impedance Headset Adapter - 5 Ohm Mic - 8 Ohm Phones allows a low impedance headset to be
used with a civilian aviation audio controller. The JA39-001 operates using the microphone bias supply of the audio
controller and requires no other external power. The phones audio from the audio controller is impedance matched
from 150 Ohms to 8 Ohms.
The JA39-001 is a simple plug and play solution that uses the microphone bias provided by the audio system to
amplify the Low Impedance Mic Signal to an appropriate level, and matches the headset impedance via transformer.
1.2 Features Overview
The JA39-001 features one male and one female TJ-120 telephone jack and follows industry standard interconnect
for aviation headsets.
The JA39-001 unit features an industry standard headset pin-out to allow plug and play operation.
The JA39-001 plugs in-line with the headset cord.
The JA39-001 uses a metal enclosure to shield the circuitry from Radio Frequency Interference.
1.3 Inputs and Outputs
Refer to the JA39-001 connector maps for the mating connector designators and pin assignments for the
input and output signals.
1.3.1 Inputs
Name
Qty
Type
MIC INPUT HI/LO
2
Audio signal
PHONES INPUT HI/LO
2
Audio signal
1.3.2 Outputs
Name
Qty
Type
MIC OUPUT HI/LO
2
Audio signal
PHONES OUPUT HI/LO
2
Audio signal
1.3.3 Mic Bias Voltage Supply
The Microphone Output accepts a DC MIC INPUT bias voltage supply from the Audio Controller.

JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
Installation Manual
Rev A Page 2
1.4 Specifications
1.4.1 Electrical Specifications
Power Input
Primary nominal voltage 12.0 Vdc (Mic Bias)
Primary nominal input impedance 450Ω±10%
Maximum voltage 16.0 Vdc
Minimum voltage 10.0 Vdc
Input current at 12 Vdc ≤ 0.01 A
1.4.1.1 Audio Performance
Rated Input Level
Phones rated input level 7.75 Vrms ±10%
Microphone input level 250 uVrms ±10%
Rated Output Level
Phone rated output 0.890 Vrms±10%
Microphone rated output 250 mVrms±10%
Audio Frequency Response
Audio output audio frequency response ≤3dB from 300 to 6000 Hz
Distortion Characteristics
Audio output distortion at rated power ≤10%
Input Impedance
Microphone input Impedance 5 Ω±10%
Phones input Impedance 150 Ω±10%
Audio Noise Level without Signal
Noise level below the rated output ≥50 dB
1.4.1.2 Audio Performance, Other
Microphone input designed for MIC type dynamic
Phones output circuitry type transformer
1.4.2 Mechanical Specifications
Height 3.14 in [79.8 mm] max
Depth 1.05 in [26.7 mm] max
Width 0.73 in [18.5 mm] max
Weight 0.11 lbs. [51.2 g] max
Connectors (2): J1 One 4 pole TP-120 plug
J2 One 4 pole TJT-120 jack
Mounting Insertion into TJ-120 jack
Installation Kit Not Required.

Rev A Page 3
JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
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 JA39-001 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/warranty.
2.3.1 Warranty
All JA39 products manufactured by JAC are warranted to be free of defects in workmanship or performance for 1 year
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 JA39 may be installed only by following the applicable airworthiness requirements.
2.4.2 Cabling and Wiring
The JA39 plugs directly into a standard aircraft audio system headset connector. All wires to said connector 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.
2.4.3 Mechanical Installation
The JA39-001 can be mounted in any attitude and location sufficient clearance for the connector body and headset
plug. It requires no direct cooling.

JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
Installation Manual
Rev A Page 4
CAUTION: When plugged in to a headset audio connector, the JA39 could create excessive strain on
the connector. Ensure that the JA39 is protected from impact, and that no tension is applied to any
attached headset cord.
2.4.4 In-Line PTT Cordsets
If in-line PTT cordsets (drop cords) are used, be aware that incorrectly configured or improperly shielded in-line PTT
cordsets can lead to significant audio problems.
2.4.5 Post Installation Checks
2.4.5.1 Configuration
The JA39 has no configuration options.
2.4.5.2 Power on Checks.
Power up the aircraft’s systems and confirm operation of all functions of the JA39.
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
The JA39-001 is designed to operate regardless of the input and output polarities of the attached audio controller and
headset.
2.5.1 Microphone Operation
The JA39-001 amplifies the MIC INPUT audio and routes it to the MIC OUTPUT.
2.5.2 Phones Operation
The JA39-001 impedance matches the PHONES INPUT audio and routes it to the PHONES OUTPUT.
2.6 Installation Kit
The JA39-001 does not require an installation kit.
2.7 Installation Drawings
The drawings and documents required for Installation can be found in Appendix A of this manual.

Rev A Page B1
JA39-001 Low Impedance Headset Adapter - 5ΩMic - 8ΩPhones
Installation Manual
Appendix A - Installation Drawings
A1 Introduction
The drawings necessary for installation and troubleshooting of the JA39-001 Low Impedance Headset Adapter
are in this Appendix, as listed below.
A2 Installation Drawings
DOCUMENT Rev
JA39-001 Connector Map A
JA39-001 Interconnect A
JA39-001 Mechanical Installation &

JUPITER AVIONICS TEMPLATE AUTOCAD PORTRAIT SIZEA REV B.DWT
TITLE
APPROVED
PREPARED
CHECKED
L00N3
NCAGE CODE PART NO. SHEET
DOC NO.
CONFIDENTIAL & PROPRIETARY
TO JUPITER AVIONICS CORP.
Low Impedance Headset Adapter
5 Ohm Mic - 8 Ohm Phones
JA39-001 1/1
JA39-001 Connector Map Rev A.dwg
TAT
P1
TJ-120 or U-92 A/U
MATING CONNECTOR
PIN 4: Phones Output Lo
PIN 2: Phones Output Hi
PIN 3: Microphone Input Lo
PIN 1: Microphone Input Hi
View of Aircraft mating connector
Aircraft or wiJAC Connector
Headset Connector
P2
U174/U or U-93A/U
MATING CONNECTOR
View of Headset mating connector
3rd Ring / PIN 4: Phones Output Lo
1st Ring / PIN 2: Phones Output Hi
TIP / PIN 1: Microphone Input Hi
2nd Ring / PIN 3: Microphone Input Lo

JUPITER AVIONICS TEMPLATE AUTOCAD PORTRAIT SIZEA REV B.DWT
TITLE
APPROVED
PREPARED
CHECKED
L00N3
NCAGE CODE PART NO. SHEET
DOC NO.
CONFIDENTIAL & PROPRIETARY
TO JUPITER AVIONICS CORP.
Low Impedance Headset Adapter
5 Ohm Mic - 8 Ohm Phones
JA39-001 1/3
JA39-001 Interconnect Rev A.dwg
TAT
Aircraft Intercom System
Low Impedance
Low Impedance Headset
JA39-001
Headset Adapter
Aircraft Headset Jack
8 Ohm
Phones
5 Ohm Mic