Northern Airborne Technology AA23 Manuale utente
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM23
AA23
Speaker Amplifier
INSTALLATION AND OPERATION MANUAL
REV 4.00 November 21, 2003
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna BC, Canada
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Copyright 2003 by Northern Airborne Technology
SM23 Rev. 4.00 AA23 Speaker Amplifier Manual
Nov 21, 2003 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
809-0001 Oct 29,2004 2 Oct 29,2004
Insert any Amendment Instruction sheets after this page.
Performed at factory
INSTALL_OPS MANUAL
AMENDMENT
Manual: SM23 (AA23) Amendment #: 1
Document # SM23\Install_Ops\809-0001 Amendment Date: Oct 29, 2004
Amendment # 1 Oct 29, 2004 Page 1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to add the most recent drawings to the installation
section of the manual.
Amendment Instructions:
1 Remove Pages Replace With Pages
2-3 Rev. 4.00 2-3 Rev. 4.00 Amendment #1
2 Remove Drawings (Section 2) Replace or add Drawings (Section 2)
- AA23\922-0 Rev. 1.30
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages
SM23 Rev. 4.00 AA23 Speaker Amplifier Manual
Nov 21, 2003 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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 1-3
1.4.3 Environmental Specifications 1-3
1.5 Accessories Required but not supplied 1-3
1.6 Unit Nomenclature 1-4
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-1
2.3.3 Notes 2-2
2.3.4 Cable and Wiring 2-2
2.3.5 External Components 2-2
2.3.6 Post-Installation Checks 2-2
2.4 Continued Airworthiness 2-3
2.5 Installation Drawings 2-3
3.0 Operation
3.1 Introduction 3-1
3.2 General 3-1
3.3 Performance 3-1
SM23 Rev. 4.00 AA23 Speaker Amplifier Manual
Section 1.0 Description
1.1 Introduction
This manual contains information on the AA23 Speaker Amplifier.
Information in this section consists of purpose of equipment, features and specifications.
1.2 Purpose of Equipment
The AA23 is a versatile speaker amplifier that can be used to convert balanced 600 Ω
line, 150/600 Ωheadset, or carbon-equivalent microphone levels to speaker outputs.
The interface to the AA23 is fully floating (transformer coupled), permitting complex and
long distance interconnects and providing outstanding rejection of ground loop signals.
The speaker output is ground referenced.
The AA23 can be used for distributed music systems, paging, transfer of headset based
systems to speaker based outputs, or as a very high powered headset booster driver.
The output of the AA23 can be selected ON or OFF by a simple logic line (GND =
muted) to simplify external wiring in most applications.
Extensive key logic and muting capability is also incorporated into the AA23, which
addresses close cockpit installations, and provides some extra flexibility in difficult
installations. Either fully muted or partially muted installations can be accomplished
through interconnect pin selection.
The AA23 will drive any speaker load from 3.2 to 16 Ω, but provides optimum energy
transfer into either 4 or 8 Ωloads. If operated continuously with a high average power
level, the unit must have air exchange for the heat sink assembly to function properly.
1.3 Features
The AA23 incorporates a power (and fuse) monitor LED that allows in-place visual
indication of unit activity. The LED will turn off if either the external breaker or internal
fuse is tripped.
The AA23 incorporates an internal noise filter to eliminate DC coupled interference into
the system.
To provide a choice of bandpass operation (voice or music), the AA23 has an internal jumper
selection. With the jumper installed, the bandpass is slightly reduced to provide better voice
performance and improved feedback reduction. With the jumper removed, wide band music
operation can be achieved. The units are shipped with the jumper installed.
Nov 21, 2003 Page 1-1
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
AA23 Speaker Amplifier Manual SM23 Rev. 4.00
An internal trimpot is provided to permit level adjustment of the over-all system. As
shipped, range remains in both directions, up and down.
A set of uncommitted relay contacts (2 A rating) is provided that is closed when the unit
receives a mute command (key ground input). This can be used for external switching.
Fully muted (no output) and partially muted outputs are available to provide a choice of
enabled or disabled speaker sidetone. The muting circuit inserts a 44 Ωresistor in
series with the load, to reduce the output level.
Two external, unrelated key inputs can mute the AA23, and both provide a flow-through
key output to other systems. This permits two users in a close cockpit installation to
mute each other's speakers to prevent feedback, and provides outputs to the balance of
the audio system for TX keying.
The headset input places a greater than 1.8 kΩload on the existing headset driver
system, which represents a negligible load. It is a fully floating input, and will not
introduce any ground loop interference unless grounded via the user interconnect. This
line is meant for signals of typically +17 dBm to +20 dBm (50 mW/600 Ω).
The 600 Ωline input can be used with lower level sources to provide a speaker buffer
as needed. Input sources can be music, radio feeds (via a pad) or other sources. Note
that this connection is the direct input to the AA23 transformer, and is isolated from the
headset input only by a simple resistive pad. Signals injected here may appear back at
the headset input, and cause problems if isolation was intended.
The mic input accepts a ‘carbon-equivalent’ unit, and has internal excitation from the
AA23. The input is floating, and must have a ground at the input low connection to
excite the microphone. This is normally provided by any NAT audio system if used to
provide the mic input (PA position).
1.4 Specifications
1.4.1 Electrical Specifications
Input Power +22 to 32 Vdc.
Supply Current 1.0 A max. (at full output into 3.2 Ω).
0.3 to 0.5 A (typical)
Input Levels
600 Ωinput 0.45 Vrms (-5 dBm) at 1 kHz.
H/S Input 7.70 Vrms (+20 dBm) at 1 kHz.
Mic Input 0.25 Vrms at 1 kHz.
Page 1-2 Nov 21, 2003
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
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