Northern Airborne Technology InterMUSIC AA83-100 User manual

SPECIAL NOTICE
Ownership of this product has been transferred to Cobham Aerospace Communication
from Anodyne Electronics Manufacturing (AEM) and Northern Airborne Technology
(NAT). Cobham is responsible for all matters related to this product, including sales,
support and repair services.
Please note the transition to convert product manuals and supporting documentation is
an ongoing process and is being addressed on an ‘as needed’ basis.
All references to AEM and NAT product part numbers (and associated images) are
equivalent to Cobham product part numbers.
Contact info:
Cobham Aerospace Communication,
6400 Wilkinson Drive, Prescott, Arizona, 86301.
Telephone: [phone] or refer to the following website:
www.wulfsberg.com for more information.

PROPRIETARY NOTICE
PROPRIETARY STATEMENT
This document contains confidential and proprietary information and is the property of Chelton Avionics, Inc., a subsidiary of
Cobham plc. It is to be provided in confidence on the condition that by receipt it is not reproduced or copied in whole or in part, or
used to furnish such information to others, or to make use of it for purposes other than specified by the Usage Statement. The
previous statement shall not apply to the extent that such statement violates any federal or state laws requiring such information to
be made available to the public. Non-current versions of this document must be returned to Chelton Avionics, Inc. or destroyed or
shredded in a manner that renders the document completely and totally unusable and illegible.
EXPORT CONTROLS STATEMENT
The technical data within this document is controlled for export under the export administration regulations (EAR), 15 CFR PARTS
730-774, violations of these laws may be subject to fines and penalties under the export administration act.
FCC STATEMENT
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation. Before operating the products covered by this document, read the operating
instructions for safe usage. Regarding Part 15.21, changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
USAGE STATEMENT
The data in this document was developed only to maintain systems and/or parts manufactured by, manufactured for, or approved
by Cobham. The data may not be applicable to any other systems and/or parts, regardless of their apparent similarity to systems
and/or parts manufactured by, manufactured for, or approved by Cobham. Do not rely, in any way, on data in this document to
maintain or otherwise support systems and/or parts that were not manufactured by, manufactured for, or approved by Cobham,
without evidence that the Federal Aviation Administration or other regulatory agency has determined that the data in this document
is valid for such use. This document shall not be used for the development, manufacture, service, support, modify, overhaul or
obtain FAA or any other regulatory approval of any other products than are specified within.
Cobham assumes no liability whatsoever, whether contractual, warranty, tort or otherwise, for unauthorized work not performed in
accordance with Chelton Avionics, Inc. approved procedures.
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DISCLAIMER
The content of this document has been reviewed for accuracy and is believed to be reliable, however no responsibility is assumed
for typographical errors and inaccuracies. Chelton Avionics, Inc. reserves the rights to revise the contents within to improve
accuracy and apply updated information related to design and serviceability without prior notice to users. The latest published
revision is the only version authorized for use.
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All other brand and product names are trademarks or registered trademarks of their respective holders.
Copyright© Chelton Avionics, Inc.
All Rights Reserved
Cobham Aerospace
Communications
6400 Wilkinson Drive
Prescott, AZ USA 86301
T: [phone]
F: [phone]
Proprietary Information: Use or disclosure of this data is
subject to the restrictions specified in the introductory
section of this document

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM09-3
AA83-100
InterMUSIC™Stereo Intercom
INSTALLATION AND OPERATION MANUAL
REV 4.00 March 4, 2005
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Copyright 2005 by Northern Airborne Technology

SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Mar 4, 2005 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment
Number
Amendment
Date
Section(s)
Changed
Date
Entered
Entered By
Insert any Amendment Instruction sheets after this page.

SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Mar 4, 2005 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.3.1 Stereo & Intercom Special Features 1-1
1.3.2 Communication Functions 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Mechanical Specifications 1-4
1.4.3 Environmental Specifications 1-4
2 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.2.1 Warranty 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-2
2.3.3 Cabling and Wiring 2-2
2.3.4 Adjustments 2-2
2.3.5 Mechanical Installation 2-3
2.3.6 Post Installation Checks 2-4
2.4 Continued Airworthiness 2-5
2.5 Accessories Supplied 2-5
2.6 Installation Drawings 2-6
3 Operation
3.1 Introduction 3-1
3.2 General Operation 3-1
3.2.1 Stereo & Intercom Special Features 3-1
3.2.2 Communication Functions 3-1
3.2.3 Important Operating Considerations 3-1
3.2.4 Installation Adjustments 3-2
3.3 Controls and Indicators 3-2
3.3.1 ICS VOL/VOX 3-2
3.3.2 Music Vol 3-2
3.3.3 VOX Operation 3-3
3.3.4 Annunciator 3-3
3.3.5 MODE Control 3-3
3.3.6 Radio Functions 3-4
3.3.7 Muting Logic 3-4
3.3.8 Automatic Fail-safe 3-5

SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Section 1 Description
1.1 Introduction
Information in this manual consists of the operational procedures and specifications for
the AA83-100 InterMUSIC™Stereo Intercom.
1.2 Purpose of Equipment
The AA83-100 is a 4-place stereo voice-activated intercom that provides full intercom
capabilities for the pilot and copilot and two passengers (PAX). It provides
entertainment and communication audio in full stereo to all four headsets, and
transceiver control for both the pilot and co-pilot. The AA83-100 accepts stereo music
input from portable entertainment units, CD players or other integrated on-board
systems to produce high quality stereo headset output. The InterMUSIC™family of
stereo intercoms allows several installation configurations - from single unit systems, to
fully independent stations for the pilot, copilot and passengers. For expanded systems,
tie line connections are compatible with other NAT systems including AA82, AMS4x and
AA9x series units.
1.3 Features
1.3.1 Stereo & Intercom Special Features
The stereo music audio is muted during transmit or intercom operation and when radio
receive audio is detected, permitting greater intelligibility of incoming transmissions.
The AA83-100 muting depth adjustment ranges from complete music muting to gentle
background music on command, with a fast attack and slow level return for optimum
user comfort. Each microphone is individually gated, for the best possible noise
performance during VOX operation. A front panel annunciator allows easy visual
setting of the VOX threshold, and also indicates transmit operation.
1.3.2 Communication Functions
The AA83-100 provides full boom-mic transmit and ICS functions for the pilot and co-
pilot, and provides ICS and radio monitor operation for two additional passengers. Pilot
priority on transmit and pilot isolation (direct connection to the aircraft radio system) are
standard features on all NAT intercom systems. The AA83-100 can support PTT ICS
operation for all users, and can be wired to cyclic/yoke switches for both TX and ICS
functions.
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AA83-100 InterMUSIC™Stereo Intercom Manual SM09-3 Rev. 4.00
1.4 Specifications
1.4.1 Electrical Specifications
Input Power Linear regulator with over voltage protection.
Operating Voltages
Nominal 27.5 or 13.8 Vdc @ 550 mA max (one input for both)
Maximum 30.3 Vdc
Minimum 11.0 Vdc
Internal supply 11 Vdc
Input Signals
Microphone
Quantity 4 (pilot, copilot, 2 Passengers).
Rated level 250 mVrms nominal (125 to 500 mVrms)
Impedance 150 Ohm ±10%
Circuitry type unbalanced
TX Keyline
Quantity 2 (pilot, copilot).
Rated level ground activates keyline, <20 mA source current
ICS Keyline
Quantity 4 (pilot, copilot, 2 Passengers).
Rated level ground activates keyline, <1 mA source current
Receive Audio
Quantity 1
Rated level 2.5 Vrms nominal (1.3 to 5.0 Vrms)
Impedance 1.2 kOhm ±20%
Circuitry type unbalanced
Music Inputs
Quantity 2 (left channel, right channel)
Rated level 1.4 Vrms nominal (850 mVrms to 2.4 Vrms)
Impedance 12.5 kOhm ±10%
Circuitry type unbalanced
Bidirectional Signals
ICS TIE Channel
Quantity 1
Rated level 340 mVrms nominal (170 to 680 mVrms)
Impedance 2 kOhm ±10%
Circuitry type unbalanced
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SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Output Signals
Phones
Quantity 4 (pilot, copilot, 2 Passengers)
Rated level >5.5 Vrms (>100 mW; RX, ICS and Music)
Impedance 300 Ohm ±10%
Circuitry type transformer, unbalanced
Radio TX Mic
Quantity 1
Rated level 250 mVrms ±10%
Impedance 150 Ohm nominal
Circuitry type direct throughline via relay
Radio TX Keyline
Quantity 1
Rated level <1 A
Circuitry type grounded relay contact
Audio Performance
As per RTCA DO-170 except where noted. Product Classification 1a
Full Output Power 100 mW min into 300 Ω(each stereo channel)
Audio frequency response
Receive <3dB down from 350 - 6000 Hz
Intercom <3dB down from 350 - 3000 Hz
ICS Tie <3dB down from 350 - 3000 Hz
Music <3dB down from 300 - 15000 Hz (Music Bass
control at mid setting)
Distortion <10%, <3 % typical (350 to 6000 Hz)
Input - Input crosstalk -50 dB max*
Input - Output crosstalk -55 dB max
Input - Mic crosstalk <1.0 mVrms*
Audio noise -50 dB max
Output Regulation ≤3 dB variance (350 to 6000 Hz)
Audio Communication Loud & Clear
ICS Volume controls >35 dB*, 40 dB nominal
Music Volume controls >35 dB*, 40 dB nominal
Stability and Short Circuit Protection
No spurious or sustained oscillations.
Receive Input impedance 1.2 kΩ±20 %
Mic Input impedance 150 Ω±10 %
Music Input impedance 12.5 kΩ±10 %
Tie Line 2 kΩ±10 %
* Manufacturer specification
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AA83-100 InterMUSIC™Stereo Intercom Manual SM09-3 Rev. 4.00
Miscellaneous Audio Performance
ICS BAL control ≥20 dB dynamic range
MUSIC BAL control ≥20 dB dynamic range
RX BAL control ≥20 dB dynamic range
ICS BASS control ±2.5 dB min. range at 350 Hz*
MUSIC BASS control ±2.5 dB min. range at 350 Hz*
MUSIC MUTE control -60 dB to -10 dB
RX VOL control ≥35 dB dynamic range
Music attack/decay time <7 seconds
* measured at -10 dB ref: rated input level
1.4.2 Mechanical Specifications
Height 1.32" (33.5 mm) max.
Depth 7.20" (182.9 mm) max. total
5.84" (148.3 mm) max. depth behind panel
Width 2.62" (66.5 mm) max, panel width
Weight 0.70 lb (0.32 kg) max
Mounting Through front panel; three 6-32 black brass
screws. Aircraft panel thickness 0.050" to 0.125"
Faceplate Double-sided photo-imaged 0.062" aluminum
plate, 1.3" x 2.6"
Material/Finish Chassis/Cover: Brushed aluminum with
chromate conversion
Connectors One 44 pin male high-density D-min connector
with jackposts
Installation Kit AA83-100-IKC
1.4.3 Environmental Specifications
Temperature -20 °C to +55 °C
Altitude 50 000 ft.
Shock 6g/11ms, 20g/11ms, 20g/3s sustained.
Qualification:
DO-160D Env. Cat. [(A1)(D1)X]BXB[(SMB)(UF)]XXXXXXZBAXXXMXXXX
Safety of Flight requirements per RTCA/DO-160D Environmental Conditions.
End of section 1
Page 1-4 Mar 4, 2005
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Section 2 Installation
2.1 Introduction
Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually
for damage due to shipping and report all such claims immediately to the carrier
involved. Note that each unit should have the following:
- AA83-100 InterMUSIC™Stereo Intercom
- Installation kit (see section 2.5)
- Warranty Card
- Operator’s Manual
- Release certification
Verify that all items are present before proceeding and report any shortage immediately
to your supplier.
2.2.1 Warranty
Complete the warranty card information and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on
date of shipment from NAT.
Note: An appropriately rated facility, e.g. Certified Aircraft Repair Station, must install
this equipment in accordance with applicable regulations. NAT Ltd’s warranty is
not valid unless the equipment is installed by an authorized NAT Dealer. Failure
to follow any of the installation instructions, or installation by a non-certified
individual or agency will void the warranty, and may result in a non-airworthy
installation.
2.3 Installation Procedures
2.3.1 Warnings
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any
logic, audio, or DC power lines from this unit with 400 Hz synchro wiring or AC power
lines. Do not position this unit next to any device with a strong alternating magnetic field
such as an inverter, motor or blower, or significant audio interference will result.
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AA83-100 InterMUSIC™Stereo Intercom Manual SM09-3 Rev. 4.00
2.3.2 Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant problems may result from not following these guidelines.
All audio installations can be seriously degraded by incorrect wiring and shielding, and
may result in abnormal cross-talk, hum and ground-loop noise. Be especially careful
with all microphone wiring and Tie Line wiring, as these lines carry the lowest level
signals in the aircraft.
All microphone and headset jacks should be electrically isolated from the airframe or
significant ground loop noise may result.
2.3.3 Cabling and Wiring
All unshielded wire should be MIL-W-22759 or equivalent. For shielded wire
applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the
wiring diagrams in Section 2.6 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring
is complete. Aircraft harnessing should permit the unit to be lowered from the panel for
easy access to all side adjustments. Do NOT mount the unit until all adjustments have
been carried out.
All wiring should be at least 22 AWG. Ensure that all ground connections are clean and
well secured, and that they share no path with any electrically noisy aircraft accessories
such as blowers, turn and bank instruments or similar loads. Power to this unit must be
supplied from a separate breaker (1 A) or fuse (1 A fast), and not attached to any other
existing breaker without additional protection. The correct fuse is included with the
AA83.
Ensure that all ground connections are clean and well secured.
2.3.4 Adjustments
The unit ships from the factory with all internal adjustments set to the normal test levels.
Once installed in the aircraft, it may be desirable to change some of these settings to
best suit the local operating environment.
CAUTION
Before performing the following adjustments ensure the aircraft radio’s
volume control is set to produce 2.5 Vrms ±10 % at the input to the
AA83-100, or the mute functions may not operate correctly.
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SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
The internal adjustments are located along the sides of the unit and are as follows:
2.3.4.1 ICS, RX, and MUSIC BAL.
These potentiometers are used to adjust the headset stereo balance.
2.3.4.2 ICS and MUSIC BASS
These potentiometers are used to adjust the amount of bass audio to the headsets.
Rotating ccw will lower the bass level, and cw will raise it.
2.3.4.3 RX VOL
To reduce the receive audio volume, rotate this potentiometer ccw, and to increase the
volume, rotate it cw.
2.3.4.4 MUSIC MUTE
The music mute level can be adjusted using this potentiometer.
2.3.5 Mechanical Installation
The AA83-100 can be installed in a vertical or horizontal attitude directly on the
instrument console, using the AA83-100-IKC Installation kit (see Section 2.5 for details).
Before the unit is mounted, make all functional tests and trimpot adjustments. Be sure
the harness has enough clearance to permit the unit to be dropped down for re-
adjustment, if needed later. Make sure unit is securely fastened to the panel, and that
the connector locks are tightened before any flight is attempted.
For proper installation, refer to Mounting Diagram (AA83\100\920-0) and Drill
Template (AA83\001\921-0) and the following steps:
Note: The mounting nuts on the panel pots should not be removed at any time.
a) After deciding the attitude (vertical or horizontal) of the unit, drill the required
mounting holes in the aircraft panel and insert the AA83-100 from behind the panel.
b) Remove the protective plastic film from the black metal faceplate, and position it
with the appropriate legend orientation facing out. Secure with the mounting
screws provided.
Note: Ensure that the aircraft panel is tightly ‘sandwiched’ between the
AA83-100 and faceplate.
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AA83-100 InterMUSIC™Stereo Intercom Manual SM09-3 Rev. 4.00
c) Rotate the inner and outer shafts of the ICS VOL / VOX potentiometer fully ccw.
The outer knob may be rotated by hand, but it may be necessary to temporarily
attach the inner ICS knob to facilitate this action. Align the white markers on the
knobs (part of 40-21-ICS3) to the LIVE position on the faceplate label. Using a
0.05" Allen key, tighten the knobs onto the potentiometer shafts.
d) Rotate the shaft of the MUSIC VOL potentiometer fully ccw. Align the white
marker on the knob (part of 40-18-MUS2) to the MIN position on the faceplate
label. Using a 0.05" Allen key, tighten the knob onto the potentiometer shaft.
Note: Make sure there is enough clearance between the concentric knobs so
that rotating one does not also move the other. A piece of paper makes a
good spacer when setting up the clearance.
2.3.6 Post-Installation Checks
If any preset requires adjustment, be sure this is carried out before the aircraft leaves,
and that the unit and its mating connector are secured before departure. Make all
required log book entries, electrical load, weight and balance amendments and other
paperwork as required by your local regulatory agency.
2.3.6.1 Voltage/resistance checks
Do not attach the AA83-100 until the following conditions are met.
Check the following:
a) Check P101, pin <1> for +12 to +28 Vdc relative to ground.
b) Check P101, pin <16> for continuity to ground (less than 0.5 Ω).
c) Check P101, pins <11> and <12> for continuity to ground (less than 0.5 Ω) when
the relevant ICS switch is keyed.
d) Check all mic, phone, music, and key lines for shorts to ground or adjacent pins.
Check all key lines for correct operation.
2.3.6.2 Power On checks
Install the AA83-100 and power up the aircraft’s systems, and turn on the radios and
accessories required. Verify normal operation of all functions. Refer to Section 3 for
specific operation details.
a) Begin with only the pilot's headset installed, no hand mic. Check for correct radio
operation (both receive and transmit) and ICS operation. Check yoke (or cyclic)
switch action.
b) If there is a music source in the system turn it on and verify that music is heard in
all modes except PLT ISO. Check for proper mute operation.
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SM09-3 Rev. 4.00 AA83-100 InterMUSIC™Stereo Intercom Manual
Note: Unusual buzzes, hums or other background audio may be symptomatic of
multiple grounds or noisy external systems sharing the same wire bundle.
Incorrect jack wiring is a common fault, especially for passenger stations, and
may cause loss of audio, a tone on the headset lines, or other problems.
c) Plug in the copilot's headset. Check for correct radio and ICS operation. Check
pilot's transmit priority. Check yoke or cyclic switch functions, if applicable.
d) Plug in the hand mic (if applicable to the installation), and test for correct
operation in all modes. It must activate the transmitter(s) in all cases.
e) Plug in any remaining headsets, and check for correct ICS operation.
f) To verify proper operation, all functions and levels should be checked in-flight.
Be sure headsets are of good quality and are installed correctly. Unless the AA83 has
specifically been wired for mono operation NEVER USE MONO AIRCRAFT
HEADSETS in the system, as they will short out one side of the AA83 power amplifier
when installed in stereo jacks. This may result in eventual unit failure, which IS NOT
COVERED BY WARRANTY.
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
2.4 Continued Airworthiness
Maintenance of the AA83-100 is ‘on condition’ only. Periodic maintenance of this
product is not required.
2.5 Accessories Supplied
Installation kit p/n AA83-100-IKC (crimp) is required to complete the installation. The kit
consists of the following:
Quantity Description NAT Part #
1 D-sub Socket 20-20-044
44 Contacts 20-26-703
1 Jackscrew, D-sub, Pair 20-27-002
1 Hood, D-sub, Plastic 20-29-026
1 AGC, Fast, 1 A 23-00-006
3 Screw, panhead, Phillips, Brass, Black 25-11-427
1 Knob, Fluted Concentric, Rubber 40-21-ICS3
1 Knob, Printed Fluted, Rubber, Music 40-18-MUS2
1 Legend and Template, AA83 43-10-083
1 Faceplate, Rectangular, AA83-100 50-04-832
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AA83-100 InterMUSIC™Stereo Intercom Manual SM09-3 Rev. 4.00
2.6 Installation Drawings
DRAWING REV. DESCRIPTION TYPE SERIAL #
AA83\100\403-0 1.00 Stereo Intercom Interconnect 2351 and up
AA83\100\405-0 1.00 Stereo Intercom Connector Map 2351 and up
AA83\100\905-0 1.00 Stereo Intercom Faceplate 2351 and up
AA83\100\920-0 1.00 Stereo Intercom Mounting Diagram 2351 and up
AA83\001\921-0 1.00 Drill Template Drill Template 2351 and up
AA83\100\922-0 1.00 Stereo Intercom Mech. Installation 2351 and up
Section 2 ends after these Drawings
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

LIVE
MUSIC
INTER
ICS
VOL
MIN
VOX
VOL
MUSIC
MUSIC
VOL
VOX
MAXMINMAX
VOL
ICS
NORM
PILOT ISO
INTER MUSIC
LIVE
O
S
I
T
O
L
I
P
N
O
R
M

Confidential and Proprietary to NAT