Northern Airborne Technology PA110 - Manual (Page 4)

PA110/220 High Power Audio Amplifiers
SM35 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
PA110/220 High Power Audio Amplifiers. 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 PA110 and PA220 High Power Audio Amplifiers are remote mounted modular amplifiers capable of
producing 110 W of output power, and can be used in conjunction with NAT’s Loudhailer/Siren systems.
Lower power systems (30 W) are usually used for sling load control and local external paging in smaller
airframes, or internal rear paging in larger airframes. Higher power systems (110 W and up) are used for
law enforcement and long distance external paging applications. The PA110/220 can be chained into
multiple installations, allowing up to half a kilowatt of audio to be controlled by a single panel mounted
controller.
1.3 Design Features
Provision is made for external power switching to activate PA110 and PA220 High Power Audio
Amplifiers for increased power output.
All external interconnects, switches and relay contacts are gold plated for maximum reliability. Switches and
relays are sealed. G10-FR flame retardant circuit boards are postcoated for maximum moisture resistance
and corrosion prevention. Relays are sealed, high vibration rated (50g shock) and dry nitrogen filled.
1.4 Specifications
1.4.1 Electrical Specifications
1.4.1.1 PA110
Power +28 Vdc nominal at 5.5 A max; Idle current less than 0.1 A
Low Level Input Impedance 600
Ω ±5%
High Level Input Impedance 300
Ω ±5%
Output 100 W nominal @ 1 kHz into 10
Ω, Transformer coupled
1.4.1.2 PA220
Power +28 Vdc nominal at 10 A max; Idle current less than 0.1 A
Low Level Input Impedance 600
Ω ±5%
High Level Input Impedance 300
Ω ±5%
Output 2 x 100 W nominal @ 1 kHz into 10
Ω, Transformer coupled