Jupiter Avionics JA37-300 User manual

Rev
B Page i
JA37-300 Aural Message Generator –
3 Channel - Analog Inputs
Installation and Operating Manual
Rev B
Jupiter Avionics Corporation
1959 Kirschner Road
Kelowna BC
Canada V1Y 4N7
Tel: [phone]
Toll-Free: 1 855 478 2232
www.jupiteravionics.com

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page ii
Copyright 2021 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
Dec 2015
Initial release, serial number 1001 and higher.
3791
B
Jan 2021
JA37-300 Rev C, serial number 8551 and higher.
7380
Prepared:
DGB
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
SRM
02-01-21 JAC
KDV
02-01-21

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B 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 ............................................................................................................................................................ 2
1.4 Specifications .......................................................................................................................................................... 2
1.4.1 Electrical Specifications................................................................................................................................... 2
1.4.2 Mechanical Specifications ............................................................................................................................... 3
1.4.3 Flammability of Materials ................................................................................................................................ 3
1.4.4 Product Configuration Software Version ......................................................................................................... 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 .............................................................................................................................................. 5
2.4.3 Mechanical Installation ........................................................................................................................................ 5
2.4.4 Post Installation Checks ...................................................................................................................................... 5
2.5 System Operation.................................................................................................................................................... 5
2.5.1 Configuration Operation .................................................................................................................................. 5
2.5.2 Message Mute Operation ................................................................................................................................ 5
2.5.3 Message Operation ......................................................................................................................................... 6
2.5.4 Power On Self-Test Operation ........................................................................................................................ 6
2.5.5 Priority Operation ............................................................................................................................................ 6
2.5.6 Non-Priority Operation..................................................................................................................................... 6
2.5.7 RX Audio Operation ........................................................................................................................................ 6
2.6 Adjustments and Configuration using ProCS™ ...................................................................................................... 6
2.6.1 Configuration Cabling Requirements .............................................................................................................. 6
2.6.2 ProCS™ Setup................................................................................................................................................ 7
2.6.3 Configurable Settings ...................................................................................................................................... 7
2.6.4Other Configuration Features........................................................................................................................ 10
2.7 Installation Kit ........................................................................................................................................................ 10
2.7.1 Recommended Crimp tools........................................................................................................................... 10
2.8 Installation Drawings ............................................................................................................................................. 10
2.8.1 Generation of Custom Drawings ................................................................................................................... 10
SECTION 3 – OPERATION .................................................................................................................................................. 11
3.1 Introduction............................................................................................................................................................ 11
3.2 Mute Switch/Button ............................................................................................................................................... 11
3.3 Message Active Output ......................................................................................................................................... 11
Appendix A - Installation Drawings...................................................................................................................................A1
A1 Introduction............................................................................................................................................................A1
A2 Installation Drawings .............................................................................................................................................A1
Appendix B - Installation Documents ...............................................................................................................................B1
B1 Airworthiness Approval .........................................................................................................................................B2
B2 Instructions for Continued Airworthiness ..............................................................................................................B2

Rev B Page 1
JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
SECTION 1 - DESCRIPTION
1.1 System Overview
The JA37-300 Aural Message Generator - 3 Channel - Analog Inputs is a dual channel alerting system that provides
up to three different messages.
The JA37-300 is setup on a per installation basis using a Configuration Cable and downloading the system
configuration settings and aural messages into non-volatile devices.
1.2 Features Overview
The JA37-300 unit features an industry standard D-Sub connector pin-out to allow easy field upgrades.
All internal adjustments are configured using the proprietary ProCS (Product Configuration Software).
A port is provided beside the main connector for connection to the configuration cable.
All audio outputs are balanced.
The message generator input types may be configured as one of the following: discrete trigger, tachometer, 5Vdc
transducer, 100 mVdc transducer, K-Type thermocouple.
Each analog input may be configured to trigger when the input signal is 'greater than' or 'less than' the configured
level.
Two isolation amplifiers are provided for mixing in other audio signals.
1.3 Inputs and Outputs
Refer to the JA37-300 connector map for the mating connector designators and pin assignments for the
input and output signals.
1.3.1 Inputs
Name
Qty
Type
CONFIG DATA TO JA37-300
1
Data signal
MESSAGE MUTE
1
Control signal active low
POWER INPUT
1
Power supply
RX1 and RX2 HI/LO
2
Audio signal (configurable via ProCS)
MESSAGE 1 TRIGGER
Control signal configurable as one of the following:
2
Discrete
1
Analog balanced tachometer
1
Analog balanced 5 Vdc transducer
1
Analog balanced K-Type thermocoupler
MESSAGE 2 TRIGGER
Control signal configurable as one of the following:
2
Discrete
1
Analog balanced tachometer
1
Analog balanced 100 Vdc transducer
1
Analog balanced K-Type thermocoupler
MESSAGE 3 TRIGGER
Control signal configurable as one of the following:
2
Discrete
1
Analog balanced tachometer
1
Analog balanced 5 Vdc transducer
1
Analog balanced 100 Vdc transducer

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 2
1.3.2 Outputs
Name
Qty
Type
CONFIG DATA FROM JA37-300
1
Data signal
GROUND
3
Ground
PHONES HI/LO
2
Audio signal
LOW ISOLATION HI/LO
2
Audio signal
HIGH ISOLATION HI/LO
2
Audio signal (configurable via ProCS)
MESSAGE ACTIVE
1
Control signal active low
1.4 Specifications
1.4.1 Electrical Specifications
Power Input
Primary nominal voltage 28 Vdc
Secondary nominal voltage 14 Vdc
Maximum voltage 30.3 Vdc
Minimum voltage 11.0 Vdc
Emergency voltage 9.0 Vdc
Input current 0.5 A max
1.4.1.1 Audio Performance
Rated Input Level
RX audio rated input level 7.75 Vrms ±10 %
Message Analog Triggers:
Thermocouple rated input level 100 mVdc ±1 %
0-5 VDC Pressure Transducer rated input level 5 Vdc ±1 %
0-100 mVDC Pressure Transducer rated input level 100 mVdc ±1 %
Tachometer rated input level (min) 0.2 Vrms ±10 %
Tachometer rated input level (max) 22 Vrms ±10 %
Rated Output Level
Phones rated output power into 600 Ohm 7.75 Vrms ±10 %
Phones low isolation rated output power into 600 Ohm 3.87 Vrms ±10 %
Phones high isolation rated output power into 600 Ohm 1.94 Vrms ±10 %
Audio Frequency Response
Phones output audio frequency response ≤3 dB from 300 to 6000 Hz
Distortion Characteristics
Phones audio output distortion at rated power ≤10 %
Phones audio output distortion at 10% of rated power ≤3 %
Input Impedance
Receive Audio input Impedance 1000 Ω±10%
Message Analog Triggers:
Thermocouple differential impedance ≥500 kΩ
Thermocouple impedance ≥200 kΩ
Pressure transducer differential impedance ≥100 kΩ
Pressure transducer impedance ≥200 kΩ
Tachometer differential impedance ≥100 kΩ
Tachometer impedance ≥200 kΩ

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 3
Output Impedance
Phones output Impedance 300 Ω±20 %
Phones low isolation output Impedance 1.2 kΩ±20 %
Phones high isolation output Impedance 3.0 kΩ±20 %
Output Load
Phones load 600 Ω±10 %
Input to Input Crosstalk Level
Input to Input crosstalk ≤60 dB
Audio Noise Level without Signal
Noise level below the rated output ≥60 dB
1.4.1.2 Audio Performance, Other
RX input circuitry type Transformer coupled
Phones output circuitry type Transformer coupled
Message playback frequency error ±2 % max
1.4.1.3 Discrete Signals
Message Trigger (active low) signal level active ≤+3 Vdc
Message Trigger (active low) signal level inactive ≥+6 Vdc
Message Trigger (active high) signal level active ≥+8 Vdc
Message Trigger (active high) signal level inactive ≤+6 Vdc
Message Mute active low signal ≤+3 Vdc
Active low control output, active output ≤+2 Vdc
Active low control output, active, current ≤+1 Adc
1.4.2 Mechanical Specifications
Height 1.27 in [32.3 mm] max
Depth 5.02 in [127.5 mm] max
Width 4.52 in [114.8 mm] max
Weight 0.76 lbs. [0.35 kg] max
Material brushed aluminum with conversion
coating
Connectors (2): J1 One 25-pin D-Sub male, V5 locking
J2 One 4 pole 3.5mm stereo jack
Mounting 4 x 10-32 fasteners
Bonding ≤2.5 mΩ
Installation kit part number INST-JA37
1.4.3 Flammability of Materials
The JA37-300 complies with the requirements of RTCA/DO-160G Sec 26.3.3 "Flammability", through equivalent
flammability testing of materials and the Small Parts Exemption.
1.4.4 Product Configuration Software Version
Configuration of the JA37-300 requires the Product Configuration Software (ProCS) version 0.68.2 or later. Refer to
the release notes from https://www.jupiteravionics.com/productsoftware.php or contact Jupiter Avionics to ensure the
correct version is used.

Rev B Page 4
JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
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 JA37-300 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 Authorized Release Certificate or 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
This product manufactured by JAC is warranted to be free of defects in workmanship or performance for 2 years from
the date of installation by 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.
THIS WARRANTY IS VOID IF THE PRODUCT IS NOT INSTALLED BY AN AUTHORIZED JAC DEALER. 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 the headset volume to minimum before
conducting tests, and slowly increase the volume to a comfortable listening level.
CAUTION: The power input circuitry of the unit may be damaged if the installation does not conform to the
wiring instructions in this manual.
WARNING: The messages are intended only to supplement, NOT replace, airframe messages such
as ‘low rotor RPM’, ‘engine out’ or ‘decision height alerting’. The message audio feature is intended
for use as a secondary alerting system where another device provides the primary annunciation.
2.4.1 Installation Limitations
Those installing the JA37-300, on or in a specific type or class of aircraft, must determine that the aircraft installation
conditions are within standards. The JA37-300 may be installed only by following the applicable airworthiness
requirements.

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 5
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.
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 JA37-300 can be mounted in any attitude and location with adequate space for the front panel and sufficient
clearance for the connector and wiring harness. 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 P1 pin 1for +28 Vdc or +14 Vdc relative to ground.
b) Check P1 pin 14 for continuity to ground (less than 0.5 Ω).
c) Check all pins for shorts to ground or adjacent pins.
2.4.4.2 Configuration
Ensure that the JA37-300 contains the correct configuration settings. This may be done at the factory, on the
maintenance bench or in the aircraft before the power on checks are performed. Refer to section 2.5.1.
2.4.4.3 Power on Checks.
Power up the aircraft’s systems and confirm normal operation of all functions of the JA37-300.
a) Check that all configuration settings are correct.
When all performance checks are satisfied, complete the necessary regulatory documentation before releasing the
aircraft for service. Refer to Appendix B.
2.5 System Operation
Many of the System Operation parameters are configured using ProCS™ (see section 2.6).
2.5.1 Configuration Operation
The JA37-300 accepts configuration commands on the Configuration connector via the configuration cable(s) and the
configuration tool (ProCS™) – refer to section 2.6.
2.5.2 Message Mute Operation
The JA37-300 stops playing all messages if the MESSAGE MUTE input is activated momentarily while any
MESSAGE TRIGGER input is active (or when Power On Self-Test is occurring) and stays muted until the next
message trigger event.

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 6
2.5.3 Message Operation
The JA37-300 Message 1, Message 2 and Message 3audio signal playback mode are individually selectable between
Continual and One-Shot. Message playback may also be configured for Priority operation, see section 2.5.5 – Priority
Operation.
When a message is configured as One Shot, the message audio signal is routed to the phones output for the duration
of the message.When a message is configured as Continual, the Message audio signal is routed to the phones
output for the duration of the trigger input being active.
2.5.4 Power On Self-Test Operation
When the JA37-300 power is off and then POWER INPUT is applied, the three messages will play in the following
order: message 1; message 2; message 3. The Power On Self-Test messages may be muted at any time using the
MESSAGE MUTE input. See section 2.5.2.
2.5.5 Priority Operation
When Message Trigger Priority is selected (see Message Trigger Priority in section 2.6.3.1), if more than one trigger
is active, the messages will have the following priority: message 1; message 2; message 3. Note that ifa higher
priority message has been triggered and is set as continual, the lower priority messages will not play until the higher
priority trigger isno longer active.
2.5.6 Non-Priority Operation
When Message Trigger Priority is configured as equal, if more than one trigger is active, the messages will play
simultaneously (both Continual and One-Shot messages).
2.5.7 RX Audio Operation
The RX 1 and 2 audio is level controlled and summed with the Message audio and routed to the Phones 1 and 2, Low
Isolation 1 and 2 outputs.
2.6 Adjustments and Configuration using ProCS™
All the JA37-300 internal adjustments are set from the Product Configuration Software ProCS™. Configuration data is
sent to the JA37-300 via the J2 connector, using the Configuration Cables and a computer running the ProCS™
software. For configuration cabling requirements, see section 2.5.1.
For full information on the configuration process, and for installation of ProCS™ on your computer, refer to the
ProCS™ manual on the Jupiter Avionics website - www.jupiteravionics.com/productsoftware.
2.6.1 Configuration Cabling Requirements
To configure the JA37-300, it is necessary to load the Product Configuration Software ProCS™ onto a Windows-
based computer as described in the ProCS™ manual.
The cables required to configure the JA37-300 are not included with the unit.
Cabling option 1:
Quantity Description JAC Part #
1 USB A to RS232 9-Pin Cable CAB-USB-0002
1 Configuration Cable JA99-001
Cabling option 2:
Quantity Description JAC Part #
1 USB A Male to RS232 3.5mm Plug CAB-USB-0006

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 7
2.6.2 ProCS™ Setup
The JA37-300 menu item 'ProCS Setup' provides Setup drawings showing the cabling arrangement for
connecting the JA37-300 to a computer to allow configuration using ProCS™.
2.6.3 Configurable Settings
A standard unit is shipped from the factory with all internal adjustments configured to the default levels (shown in
bold). At installation, it may be desirable to change some of these settings to suit the aircraft operating requirements.
Within ProCS™ the configurable settings for the JA37-300 are grouped together into the following sections:
2.6.3.1 JA37-300 Configurable Pins Function Select
Several of the connector pins can be configured to meet the requirements of specific installations. Refer to the
JA37-300 Interconnect. Selections can be made to configure sensor types (Discrete; Tachometer; Pressure
Transducer; Thermocouple) and their associated outputs and trigger levels.
If the 'Message Trigger Priority' box is checked, the signal Priority will be shown.
The message Playback may be
selected as 'Continual' or 'One-Shot'
for each message (1 through 3).
Drop-down windows allow selection
of sensor type and trigger activation
(Greater Than; Less Than)

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 8
2.6.3.2 JA37-300 Messages
WARNING: The messages are intended only to supplement, NOT replace, airframe messages such
as ‘low rotor RPM’, ‘engine out’ or ‘decision height alerting’. The message audio feature is intended
for use as a secondary alerting system where another device provides the primary annunciation.
Audio Files
The JA37-300 is loaded with standard audio signals for each of the three messages, but the audio files window
allows these signals to be replaced with other recordings during the configuration process. Selecting 'Open…' will
open to the Jac>ProCS folders on the attached computer, but will also allow browsing of any directory accessible
from the computer, and any suitable uploaded WAV file. If a new audio file is selected, it may be played using the
arrow to the right of the Message line. See 'Saving new Audio files' below.
Phones 1 and Phones 2 Message Levels
For each of the Phones Outputs, the levels for the Messages can be adjusted from -42.5 to 0 dB. (default -20 dB)
Browse for audio files
Play selected audio file

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 9
Saving new Audio Files
Note: This pane will not have the full content shown
here if no JA37-300 is connected.
When suitable alert messages are listed in the
'Audio Files' section, they are uploaded to the
JA37-300 by selecting 'Program' from the main
ProCS menu, and clicking on
'Write JA37-300 Messages…'.
The window 'Select Messages to Write' (see below)
will open, allowing the selected audio file message
to be uploaded to the JA37-300. ProCS will
automatically convert any WAV file to the required
audio sample rate for the JA37-300.
Aselection of suitable WAV files can be found on
the JAC website:
Products>Software>Wave File Messages
www.jupiteravionics.com/productsoftware
The 'Select Messages to Write'
window is shown. Similar
windows will open for the 'Read'
and 'Erase' selections. The
desired message is chosen using
the check box to the right of the
message number, or by clicking
on the 'Select All' button.
2.6.3.3 JA37-300 RX Audio Levels
The Phones 1 and Phones 2 RX AUDIO levels may be may be selected from 1 to 8 Vrms (default 7.8 Vrms).

JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Rev B Page 10
2.6.3.4 JA37-300 Connector Maps
The connector Maps and Interconnects for the unit showing any changes made to the connector pin selection
(section 2.6.3.1 - J1 Contacts Selection) are shown in this section.
2.6.4Other Configuration Features
In the JA37-300 Product Information Window, the model number, serial number and check sum of the JA37-300 Aural
Message Generator - 3 Channel can be viewed.
2.7 Installation Kit
The kit required to install this unit is not included with the unit.
The installation kit (Part # INST-JA37) consists of the following:
Quantity Description JAC Part #
1 TAG ring 3/8" ID CON-5500-0375
1 D-Sub 25-pin connector, hood and 25 crimp pins CON-3420-0025
1 3/4" Inside Diameter, Heat Shrink Tube WIR-HTSK-0750
2.7.1 Recommended Crimp tools
Tool Type
Hand crimp tool
Positioner
Insertion/extraction tool
Positronic
9507-0-0-0
9502-5-0-0
4711-2-0-0
Daniels
AFM8
K13-1
91067-2
MIL-SPEC
M22520/2-01
M22520/2-08
M81969/1-02
2.8 Installation Drawings
The drawings and documents required for Installation can be found in Appendix A of this manual.
2.8.1 Generation of Custom Drawings
The connector map and interconnects in Appendix A of this manual are generic drawings based on the standard
version of the JA37-300. However, if a unit has been configured using JAC’s ProCS™ software to change connector
pins, the software can be used to generate fully customized drawings for use by the installer.

Rev B Page 11
JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
SECTION 3 – OPERATION
3.1 Introduction
This section contains the operating instructions for the JA37-300.
Note: The JA37-300 has no integrated operator controls. However, a remote-mounted mute switch or button
may be installed, which affects the operation of the unit.
3.2 Mute Switch/Button
If the JA37-300 is playing Alert messages (either because an alert input is active or when Power On Self-Test is
occurring), momentary activation of the remote Message Mute switch or button stops all messages from playing until
the next message is triggered.
3.3 Message Active Output
If an external annunciator is installed and connected to the JA37-300’s MESSAGE ACTIVE OUTPUT, the annunciator
will illuminate while any message is playing.

Rev B Page A1
JA37-300 Aural Message Generator - 3 Channel - Analog Inputs
Installation and Operating Manual
Appendix A - Installation Drawings
A1 Introduction
The drawings necessary for installation and troubleshooting of the JA37-300 Aural Message Generator - 3 Channel -
Analog Inputs are in this Appendix, as listed below.
Note:A fully customized set of Connector Maps and Interconnects can be created using the ProCS
software. Refer to the ProCS™ manual for further information.
A2 Installation Drawings
DOCUMENT Rev
JA37-300 Connector Map B
JA37-300 Interconnect B
JA37-300 Mechanical Installation C

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Aural Message Generator - 3 Channel - Analog Inputs
P1 Connector Map
JA37-300 1/2
JA37-300 Connector Map Rev B.dwg
TAT
1 2 3 4 5
14 15 16 17
POWER INPUT MESSAGE 1 DISCRETE TRIGGER A / MESSAGE 1 ANALOG TRIGGER + MESSAGE 1 DISCRETE TRIGGER B / MESSAGE 1 ANALOG TRIGGER - MESSAGE 2 DISCRETE TRIGGER A / MESSAGE 2 ANALOG TRIGGER + MESSAGE 2 DISCRETE TRIGGER B / MESSAGE 2 ANALOG TRIGGER -
GROUND
P1
25 PIN FEMALE DMIN
MATING CONNECTOR
VIEW IS FROM REAR OF MATING CONNECTOR
6 7 8 9 10 11 12 13
18 19 20 21 22 23 24 25
MESSAGE 3 DISCRETE TRIGGER A / MESSAGE 3 ANALOG TRIGGER + MESSAGE 3 DISCRETE TRIGGER B / MESSAGE 3 ANALOG TRIGGER - PHONES 1 HI LOW ISOLATION 1 HI HIGH ISOLATION 1 HI / RX 1 HI PHONES 2 HI LOW ISOLATION 2 HI HIGH ISOLATION 2 HI / RX 2 HI
POWER GROUND GROUND GROUND MESSAGE MUTE MESSAGE ACTIVE OUTPUT PHONES 1 LO LOW ISOLATION 1 LO HIGH ISOLATION 1 LO / RX 1 LO PHONES 2 LO LOW ISOLATION 2 LO HIGH ISOLATION 2 LO / RX 2 LO
1Configurable Contact
1 1
1 11 1 1
111
JAC
SRM
01-21-21
JAC
KDV
01-21-21

P2
4 POLE MALE 3.5MM PLUG
TIP: TX DATA
1ST RING: RX DATA
2ND RING: GROUND
3RD RING: MODE SELECT
ACCEPTS THE FOLLOWING PLUG FORMATS
JA99-001 CONFIGURATION CABLE
MATING PLUG NAMES JA37 SIGNAL NAMES
CONFIG DATA TO JA37
CONFIG DATA FROM JA37
GROUND
MODE SELECT
CONFIGURATION CONNECTOR
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Aural Message Generator - 3 Channel - Analog Inputs
P2 Connector Map
JA37-300 2/2
JA37-300 Connector Map Rev B.dwg
TAT
CAB-USB-0006 or
JAC
SRM
01-21-21
JAC
KDV
01-21-21

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JA37-300 1/5
JA37-300 Interconnect Rev B.dwg
TAT
JA37-300 INTERCONNECT WIRING NOTES
NOTES
1. ALL WIRE SIZE 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 IN ACCORDANCE WITH 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 CABLE SHOULD BE
IN ACCORDANCE WITH MIL-DTL-27500 (REVISION H OR LATER).
2. USE FOR SECOND SOURCE INPUT.
3. USE AS GROUND REFRENCE FOR SWITCH CLOSURE WHEN TRIGGERS CONFIGURED AS
ACTIVE LOW.
4. PROVIDES 50% REDUCTION IN AUDIO POWER AND LESS LOADING.
5. PROVIDES 67% REDUCTION IN AUDIO POWER AND THE LEAST LOADING.
6. EXAMPLES OF MESSAGE TRIGGERS.
7. CONNECTION TO AIRFRAME GROUND SHOULD BE MADE WITH 20 AWG WIRE. LENGTH NOT TO
EXCEED 3 FT (0.91 M).
8. CONNECTOR PIN HAS MORE THAN ONE FUNCTION. SEE THE OPTIONS SECTION OF THIS
DRAWING FOR ALTERNATIVE INTERCONNECT WIRING.
9. CABLE SHIELDS AT THE JA37 CONNECTOR END SHOULD BE TERMINATED TO AIRFRAME
GROUND USING THE TAG RING SUPPLIED IN THE INSTALLATION KIT OR EQUIVALENT.
10. USE FOR MUTING OR ACKNOWLEDGING MESSAGE.
11. EXAMPLE WHEN CONTACTS ARE CONFIGURED AS RX HI/LO.
12. EXAMPLE WHEN CONTACTS ARE CONFIGURED AS HIGH ISOLATION HI/LO.
13. EXAMPLE WHEN CONTACTS ARE CONFIGURED TO INTERFACE WITH A K TYPE
THERMOCOUPLE.
14. EXAMPLE WHEN CONTACTS ARE CONFIGURED TO INTERFACE WITH A 0 TO 5 VDC
TRANSDUCER.
15. EXAMPLE WHEN CONTACTS ARE CONFIGURED TO INTERFACE WITH A TACHOMETER.
16. THERMOCOUPLE EXTENSION WIRE MUST MATCH THERMOCOUPLE TYPE.
17. OPTIONAL MESSAGE ACTIVE ANNUNCIATOR.
JAC
SRM
01-29-21
JAC
KDV
01-29-21

6
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.
Aural Message Generator - 3 Channel - Analog Inputs
J1 Interconnect
JA37-300 2/5
JA37-300 Interconnect Rev B.dwg
TAT
LOW ROTOR
ENGINE OUT
RAD ALT 1
RAD ALT 2
6
6
2
3
2
PHONES 1 HI
PHONES 1 LO DIRECT AUDIO INPUT
8
20
JA37-300 J1 P1 25 PIN FEMALE DMIN
MATING CONNECTOR
AIRFRAME GROUND
+14 TO +28 VDC POWER
0.5A
POWER INPUT 1
POWER GROUND 14
MESSAGE 1 DISCRETE TRIGGER A 2
MESSAGE 1 DISCRETE TRIGGER B 3
GROUND 15
GROUND 16
MESSAGE 2 DISCRETE TRIGGER A 4
MESSAGE 2 DISCRETE TRIGGER B 5
GROUND 17
MESSAGE MUTE 18
MESSAGE 3 DISCRETE TRIGGER A 6
MESSAGE 3 DISCRETE TRIGGER B 7
MESSAGE ACTIVE OUTPUT 19
LOW ISOLATION 1 HI 9
LOW ISOLATION 1 LO 21
HIGH ISOLATION 1 HI 10
HIGH ISOLATION 1 LO 22
11
23
12
24
13
25
4
5
4
7
AUDIO CONTROLLER
TO PILOT'S
DIRECT AUDIO INPUT
AUDIO CONTROLLER
TO COPILOT'S
9 7
9 7
22 AWG
PHONES 2 HI
PHONES 2 LO
LOW ISOLATION 2 HI
LOW ISOLATION 2 LO
HIGH ISOLATION 2 HI
HIGH ISOLATION 2 LO
20 AWG
MESSAGE MUTE
10
5
17
+14 TO +28 VDC
MESSAGE ACTIVE
JAC
SRM
01-29-21
JAC
KDV
01-29-21

PHONES 1 HI
PHONES 1 LO DIRECT AUDIO INPUT
8
20
JA37-300 J1 P1 25 PIN FEMALE DMIN
MATING CONNECTOR
13
AIRFRAME GROUND
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.
Aural Message Generator - 3 Channel - Analog Inputs
J1 Interconnect
JA37-300 3/5
JA37-300 Interconnect Rev B.dwg
TAT
+14 TO +28 VDC POWER
0.5A
POWER INPUT 1
POWER GROUND 14
MESSAGE 1 ANALOG TRIGGER + 2
MESSAGE 1 ANALOG TRIGGER - 3
GROUND 15
GROUND 16
MESSAGE 2 ANALOG TRIGGER + 4
MESSAGE 2 ANALOG TRIGGER - 5
GROUND 17
MESSAGE MUTE 18
MESSAGE 3 ANALOG TRIGGER + 6
MESSAGE 3 ANALOG TRIGGER - 7
14
15
LOW ISOLATION 1 HI 9
LOW ISOLATION 1 LO 21
HIGH ISOLATION 1 HI 10
HIGH ISOLATION 1 LO 22
11
23
12
24
13
25
4
5
4
7
AUDIO CONTROLLER
TO PILOT'S
DIRECT AUDIO INPUT
AUDIO CONTROLLER
TO COPILOT'S
9 7
9 7
22 AWG
PHONES 2 HI
PHONES 2 LO
LOW ISOLATION 2 HI
LOW ISOLATION 2 LO
HIGH ISOLATION 2 HI
HIGH ISOLATION 2 LO
20 AWG
MESSAGE MUTE
10
5
TRANSDUCER
TACHOMETER
9
9
9
N/C
N/C
N/C
16
K TYPE THERMOCOUPLE
0 - 5 VDC
OPTIONAL ANALOG INPUTS
MESSAGE ACTIVE OUTPUT 19 17
+14 TO +28 VDC
MESSAGE ACTIVE
JAC
SRM
01-29-21
JAC
KDV
01-29-21