Northern Airborne Technology PA700 User Manual
Installation and Operation Manual
PA700 Series
High Power Voice Amplifier
SM44
ISSUE 4.02
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2003
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Prepared By: Checked By: Approved By:
The status of this installation and operation manual is controlled by issue 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 into the latest issue.
ISSUE/REVISION RECORD
Manual Issue
Number
4.02 Section 2 Rev: 1.01 Updated with the latest drawings. Mar 10, 2009
Section
Revision Number
Revision Description Issue Date
4.01 Section 1 Rev: 1.00
Section 2 Rev: 1.00
Section 3 Rev: 1.00
Update to current templates.
Updated Section 2 with the latest
drawings.
Aug 13, 2008
Installation and Operation Manual Page ii
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Table of Contents
Section Title Page
1. Description
1.1 Introduction 1-1
1.2 Product Description 1-1
1.3 Design Features 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Physical Specifications 1-2
1.4.3 Environmental Specifications 1-3
1.5 Auxiliary Components 1-3
1.5.1 Control Panel 1-3
1.5.2 Microphone 1-3
1.5.3 Loudspeakers 1-4
1.5.4 Power Supplies 1-5
2. Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.2.1 Warranty 2-1
2.3 Continued Airworthiness 2-1
2.4 Installation Procedures 2-2
2.4.1 Cautions 2-2
2.4.2 Cabling and Wiring 2-2
2.4.3 Ground Site Selection 2-3
2.4.4 Aiborne Installation 2-3
2.4.5 Remote Installation 2-3
2.4.6 Post Installation Checks 2-4
2.5 Accessories 2-5
2.5.1 Dummy Load 2-5
2.5.2 Meter Test Set 2-5
2.5.3 Protective Circuit Test Unit 2-5
2.5.4 Paralleling Transformers 2-5
2.5.5 Remote Controls 2-5
2.5.6 Tape Recorders/Players 2-5
2.6 Accessories Required But Not Supplied 2-6
2.6.1 Power/Speaker Kit 2-6
2.6.2 Recorder Input Kit 2-6
2.6.3 Microphone Input Kit 2-6
2.6.4 Remote Input Kit 2-7
2.7 Installation Drawings 2-7
Installation and Operation Manual Page iii
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Section Title Page
3. Operation
3.1 Introduction 3-1
3.2 General Information 3-1
3.3 Controls and Indicators 3-1
3.3.1 POWER Switch 3-1
3.3.2 GAIN Control 3-2
3.3.3 Push-to-Test Lamps 3-2
3.3.4 Resetting the Protective Circuit 3-3
Installation and Operation Manual Page iv
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
PA700 Series High Power Voice Amplifier. All derivative product information shall be contained in the
applicable manual supplement, which may be obtained from NAT as required.
Review all notes, warnings and cautions.
1.2 Product Description
The completely transistorized PA700 Series provides the basis for a portable, high gain, compact, tactical
sound system. It is designed to provide point-to-point dissemination of sound in application use over land,
water or from the air. The maximum useable range is greater than one mile when operated from a
favorable vantage point. The maximum rated audio power output is 700 watts with 28 Vdc input power.
Note: In airborne applications, the amplifier is normally remote-mounted in the avionics bay and the
PA700 Series controls are not operator accessible. Any necessary adjustments must be made at
the time of installation.
1.3 Design Features
The PA700 Series amplifier is a 700 watt completely transistorized unit constructed in a rug ged, black
anodized, aluminum chassis. Its reliability is enhanced by conservative design and a unique built-in
protective circuit, which shuts off the amplifier whenever excessive input or operating conditions threaten
to impair vital circuit elements.
The PA700 Series contains protective circuits, which operate to protect the semiconductor components
from the following conditions:
a) Reverse polarity
b) Excessive current or voltage
c) Internal or external short circuits
When the problem is transient or cleared, the protective circuit resets by the simple operation of the
power switch.
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
1.4 Specifications
1.4.1 Electrical Specifications
Input Power
Input Signals
Output Signals
Supply Voltage +24 to +36 Vdc normal
+40 Vdc max.
Supply Impedance <0.05Ω
Supply Current 1.0 A @ +28 Vdc (no signal)
35 A max. @ +28 Vdc (full power out)
8 A average @ +28 Vdc (voice operation)
The signal levels shown below are required for full amplifier drive at the points and impedances
shown.
JACK PINS IMPEDANCE INPUT LEVEL
MIC A-C
REC B-C
REC A-C
Output Power 700 watts into 1.4 Ω, with a 5 mVrms, 1 kHz signal applied to the
microphone input.
Output Load Impedance 1.4 Ω each channel.
Amplifier shut-down if load <1 Ω.
Frequency Response <3 dB over 300 to 10,000 Hz
Harmonic Distortion ≤10% at 40% rated power, with 1000 Hz sine wave input.
150 Ω ±15 Ω
600 Ω ±55 Ω
2000 Ω ±150 Ω
0.005 Vrms
0.5 Vrms
1.0 Vrms
1.4.2 Physical Specifications
Up to Serial No. 1075
Serial No. 1076 and up
Height 5.68" (144.3 mm) 5.78" (146.8 mm)
Depth 10.00" (254.0 mm) 10.00" (254.0 mm)
Width 8.75" (222.3 mm) 8.75" (222.3 mm)
Weight 9.88 lbs (4.485 kg) 9.9 lbs (4.54 kg)
Section 1 Rev: 1.00 Issue 4 Page 1-2
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
1.4.3 Environmental Specifications
Temperature -40 to +70°C
Altitude 35,000 feet
1.5 Auxiliary Components
The PA700 Series amplifier is designed to operate with specific compatible components to form an
effective sound system.
1.5.1 Control Panel
1.5.1.1 AA21
The AA21 Cabin PA control unit is designed to provide centralized control for an aircraft’s internal and
external PA systems. The unit is panel mounted with an illuminated NVIS Green B compliant faceplate
and a front panel switch to provide selection of the various operational modes. The AA21 provides two
low level audio signal outputs that drive the input on remote mounted power amplifiers. One output is
designed to drive the PA110/220 series amplifiers and the other output is designed to drive the
PA250/700 series amplifiers.
1.5.1.2 AA22
The AA22 PA/Siren control unit is a compact, self contained, Dzus mounted unit for use with the PA250
and PA700 series audio power amplifiers. It has a low level output rated at 500 mVrms. It provides a
centralized control for external audio paging and siren functions.
1.5.1.3 PM01-001
The PM01-001 is a remote control device designed as the operating station for a high power audio
system. The PM01-001 is equipped with two decibel meters which make it ideal for monitoring either one
or two power amplifiers.
1.5.2 Microphone
1.5.2.1 PM03-002
The PM03-002 is a hand-held, dynamic and noise-cancelling microphone with a push-to-talk button. It
comes with a coiled retractable cable and connector for direct connection to the amplifier or remote
control unit such as the PM01-001.
Section 1 Rev: 1.00 Issue 4 Page 1-3
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
1.5.3 Loudspeakers
Various types of loudspeaker arrays can be used in sound systems using the PA250/700 amplifiers.
They are identified by the style and number of drivers (and bells) in each speaker array as shown in
Table 1. As a guideline for system configuration, there should be a minimum of 1 speaker driver/bell
assembly for each 100 watts of amplifier power.
Part No. Description
TS92-02XN Standard two-bell array with drivers
TS92-04XN Standard four-bell array with drivers
TS93-04XN Standard four-bell cloverleaf array with drivers
TS94-04XN Standard four-bell mini speaker array with drivers
Table 1
Speaker Arrays
Each PA700 Series Amplifier has two loudspeaker outputs and easily supports two 4-bell arrays.
For comparison, the efficiencies of the four-bell and six-bell speakers relative to the two-bell are shown in
Table 2 (assuming the same input power is delivered to each type).
Part No. Description Efficiency
TS92-02XN Standard two-bell array with drivers 100%
TS92-04XN Standard four-bell array with drivers 195%
TS92-06XN Standard six-bell array with drivers 285%
Table 2
Efficiencies
The higher efficiency rating is due to more concentrated sound patterns and lower, more efficient powe r
conversion at each speaker driver. The larger speakers can also accept more p ower from the amplifying
system and may show an even better efficiency rating than these figures indicate.
1.5.3.1 TS92-02XN
The two-bell speaker array is widely used in airborne applications where its light weight and small size
are important considerations. While its output efficiency is not equal to that of the larger loudspeaker
types, it performs well on small and medium-sized aircraft. The size and weight of the two-bell speaker
often permits it to become a permanent installation in the aircraft.
1.5.3.2 TS92-04XN
The four-bell loudspeaker is almost universally chosen for portable sound systems. The greater efficiency
compensates for the additional weight compared to the two-bell speaker.
Section 1 Rev: 1.00 Issue 4 Page 1-4
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
1.5.3.3 TS92-06XN
The six-bell speaker array is most often used for fixed installations where size and weight are of minor
importance but the need for maximum radiated power is primary. The six-bell speake r is also used in
larger aircraft with higher-powered amplifying systems.
1.5.3.4 Multiple Speakers
The four-bell loudspeaker, TS92-04XN is designed to be assembled in groups of two, four or more. Thi s
permits the use of multiple amplifying systems for higher sound levels and greater distance.
1.5.4 Power Supplies
Power can be supplied by storage batteries, electronic supplies or vehicle/aircraft power systems. Vehicle
supplies of 24 – 28 Vdc are an obvious choice for most airborne/mobile in stallations. The 12 – 14 Vdc
supply of the commercial vehicle can not be used.
In the hand-pack series, sealed nickel cadmium cells are used. Adding extra cells can almost double the
available power.
Electronic power supplies are frequently used in maintenance shops and fixed installations. A minimum
requirement would be a well regulated supply of 20 – 40 Vdc at 25 A.
1.5.4.1 VR33-002 Power Converter
The VR33-002 is a power conversion device designed to increase the nominal 28 Vdc aircraft voltage to
33 Vdc using high speed switching DC-DC conversion. The VR33-002 is design ed to be used with the
PA700 Series Audio Power Amplifier.
Section 1 ends
Section 1 Rev: 1.00 Issue 4 Page 1-5
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIR BORNE TECHNOLOGY LTD.
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