AEM AA21-400 User manual

SPECIAL NOTICE
This product is now licensed to Anodyne Electronics Manufacturing (AEM) from Northern
Airborne Technology (NAT)/Cobham Aerospace Communications (CAC). AEM 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 NAT product part numbers (and associated images) are equivalent to AEM
product part numbers.
Contact info:
Anodyne Electronics Manufacturing Corp.
#15-1925 Kirschner Road
Kelowna B.C. Canada
V1Y 4N7
Email: [email protected]
Toll Free: 1-888-763-1088
Phone: [phone]
Fax: [phone]
www.aem-corp.com

CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
INSTALLATION AND OPERATION MANUAL
REV 5.00 November 9, 2016
Anodyne Electronics Manufacturing Corp.
15-1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Website: www.aem-corp.com
© 2016 Anodyne Electronics Manufacturing Corp. (AEM),
All Rights Reserved
SM34
AA21
-400
Cabin PA System

AA21-400 Cabin PA System
SM34 Installation and Operation Manual
Installation and Operation Manual Page ii
ENG-FORM: 820-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
COPYRIGHT STATEMENT
© 2016 Anodyne Electronics Manufacturing Corp. (AEM), All Rights Reserved
This publication is the property of AEM and is protected by Canadian copyright laws.
No part of this document may be reproduced or transmitted in any form or by any means
including electronic, mechanical, photocopying, recording, or otherwise, without the prior
written permission of AEM.

AA21-400 Cabin PA System
SM34 Installation and Operation Manual
Installation and Operation Manual Page iii
ENG-FORM: 820-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Prepared By:
Checked By:
Approved By:
The status of this installation and operation manual is controlled by the revision shown on the title page.
The status of each section is controlled by revision shown in the footer of each page. All revisions affecting
sections of this manual have been incorporated.
AEM MANUAL REVISIONS
Section
Revision Number
Revision Description
Date
All
Rev: 5.00
ECO1054: AEM Rebranding
Nov 9, 2016
Tony Pearson
Designer
Dec 6, 2016
Loen Clement
Designer
Dec 06, 2016
Tom Betzelt
Product Support Manager
Dec 7, 2016
Todd Blackstock
R&D Manager
Dec 9/16

AA21-400 Cabin PA System
SM34 Installation and Operation Manual
Installation and Operation Manual Page iv
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Table of Contents
Section Title Page
1.0 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Physical Specifications 1-4
1.4.3 Environmental Specifications 1-4
1.5 Accessories Required But Not Supplied 1-5
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Note to Installers 2-1
2.3.2 Warnings 2-1
2.3.3 Cautions 2-2
2.3.4 Cabling and Wiring 2-2
2.3.5 Post-Installation Checks 2-2
2.3.6 Adjustments and Connections 2-3
2.4 Continued Airworthiness 2-4
2.5 Installation Drawings 2-5
3.0 Operation
3.1 Introduction 3-1
3.2 Operation Specifics 3-1
3.3 Techniques of Voice Transmission 3-1
3.4 Basic Operation 3-1
3.4.1 Power Up 3-1
3.4.2 Input Function Selection 3-2
3.4.3 Volume Control 3-2
3.4.4 Mode Switches 3-3
3.4.5 Remote Power Switch 3-3

AA21-400 Cabin PA System
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA21-400 Cabin PA System.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA21-400 Cabin PA control unit is designed to provide centralized control for an aircraft’s internal and
external PA systems. The design is contained in one panel-mounted unit, with an illuminated faceplate. All
audio and keylines are interfaced to existing aircraft audio systems. Front panel switches provide selection
of the various operational modes of the AA21 and a potentiometer provides output volume control.
1.3 Features
The AA21-400 provides selection and control of internal and/or external PA system(s) installed in an aircraft.
The integrated 25 W speaker driver circuit is designed to drive one 8 speaker arrangement for internal
paging. The AA21-400 also provides a low-level audio signal output that drives the input on a remote
mounted power amplifier. The output is designed to drive the PA110/220 or PA250/700 series amplifiers.
The AA21-400 provides generation of wail and yelp siren audio on the low level output when selected on
the front panel.
A ‘+3 dB’ function allows the output level of the system to be varied by 3 dB. When the input control line is
grounded, the output is reduced by approximately 3 dB, and removing the ground returns the system to full
output.
Thermal protection is designed into the intermediate and final stage amplifiers to protect the unit during
very hot or extended high power operating conditions.
Four front panel switches provide selection of the various operational modes of the AA21-400 as described
in Section 3 of this manual (Operation).

AA21-400 Cabin PA System
SM34 Installation and Operation Manual
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1.4 Specifications
1.4.1 Electrical Specifications
Power Supply Linear DC (with reverse & over voltage protection):
Normal: +27.5 Vdc nominal.
+22.0 Vdc minimum.
+30.3 Vdc maximum.
+18.0 Vdc emergency.
Input Current: 2.3Amax.fullspeakerpower(35W)@+27.5Vdc.
2.9 A max (35 W) with 0.40 A load on Switched Power Output.
0.40 A idle @ +27.5 Vdc.
Backlighting: 150 mA max @ +27.5 Vdc.
Input Signals
Microphone: 150 Ohm amplified dynamic.
250 mVrms rated input level.
ALC Automatic level controlled for maximum intelligibility without
distortion starts @ 130 mVrms.
Impedance 130 Ohm 10%.
Music: Only one of Radio (Receive) or CD may be enabled at a time.
Radio (Receive) 2.5 Vrms into 1k 10%.
CD 1.0 Vrms into 11k 10%.
PA key: Active low. Max. current source 15 mA.
+3dB key: Active open, isolated through optical relay. Max. current source 13
mA. Reduces all audio, except sidetone, by 3 dB when grounded.
The output will be reduced 2 to 3 dB if operating above 25 W on
speaker output, or above 6.5 Vrms on PA output.
Input to Input Crosstalk: -40 dB from rated output.

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Output Signals
Speaker: Impedance and short circuit protected.
10% THD 20W single toneinto 8@50%dutycycle.Continuous.
20Wvoice/musicinto8@100%dutycycle.Continuous.
Note: Distortion is 3% THD at 10% of continuous output power
rating.
> 10% THD 35Wmax.into8with2.5VrmsintoRadio(Receive)input.
Non-continuous (short term).
Audio bandwidth: Mic input: 3dB roll-offfrom350Hzto3kHz
Radio(Receive)/CDinput: 3dB roll-offfrom350Hzto6kHz
PA: Selectable by internal jumper for either
PA110/220 (6.5Vrms10%into600)or
PA250/700(0.5Vrms10%into600)forratedoutput.
Distortion: 3% THD at rated output.
Audio bandwidth: Mic input: 3dB roll-offfrom350Hzto3kHz
Radio(Receive)/CDinput: 3dB roll-offfrom350Hzto6kHz
Siren: Only available on PA output (735 to 1620 Hz). Yelp and wail
modes with adjustable rates. Siren level control provided for
yelp/wail by one internal trimpot.
Sidetone: Adjustable 0-100 mW into 600 with 10% THD
Audio bandwidth: 3dB roll-offfrom350Hzto3kHz
Input to Output -50 dB from rated output.
Crosstalk:
Audio Noise Level: -50 dB from rated output.
(without signal)
Switched Power: +27.5 Vdc @ 0.40 Amps max. Over current protected.
Temperature Sensor The unit contains a temperature sensor IC which when triggered
reduces the input signals by 3 dB.
The IC threshold is set to approximately 130C.
Annunciator Power On (illuminates green when active)

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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
1.4.2 Physical Specifications
Height 1.11 0.03” (28.1 0.8 mm)
Depth 6.53 0.03” (165.9 0.8 mm) behind panel (including connector).
Width 4.96 0.03” (126.0 0.8 mm) behind panel.
5.75 0.03” (146.1 0.8 mm) in front of panel.
Weight 1.40 0.07 lbs. (0.64 0.03 kg)
Mounting Std. Dzus Mounting (4 fasteners)
Faceplate Engravedacrylicedge lit panel, with28Vdc backlighting.
Material/Finish Chassis & cover: 5052-H32 brushed aluminum with chromate
conversion finish.
Heat sinks: de-burred 6063-T6 aluminum with chromate conversion finish.
Connector Male filtered 25 pin D-subminiature with Positronics V5 locking
tabs.
1.4.3 Environmental Specifications
Operating Temp -30C to +55C
Survival Temp -55C to +85C
Humidity > 95%
Altitude 25,000 ft.
DO-160D Env. Cat. B4-BAB[(SBM)(UF)]XXXXXXZBABB[TTX]MXXXX
TSO Compliance TSO-C50c, RTCA DO170 Class II
(Applicable to units Serial # 1200 and up)

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Build Standard: 5.00 Nov 09, 2016 Page 1-5
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CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
1.5 Accessories Required But Not Supplied
Installation kit p/n AA21-400-IKC (crimp) or AA21-400-IKS (solder) is required to complete the installation.
They consist of the following:
AA21-400-IKC (crimp) Part #:D25SV-IKC
Quantity Description Part #
1 D-min 25 Socket housing 20-21-025
25 MS Crimp Socket 20-26-901
1 25 Pin JVL Hood/Locklever 20-29-250
AA21-400-IKS (solder) Part #:D25SV-IKS
Quantity Description Part #
1 D-min 25 Socket Solder Cup 20-20-025
1 25 pin JVL Hood/Locklever 20-29-250
End of Section 1.0