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.