Northern Airborne Technology AA22 - Manual (Page 5)

AA22 Series PA Driver/Siren Control
SM33-2 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0113.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 AA22
Series PA Driver/Siren Control. 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 AA22 Series PA Driver/Siren Control is a compact, self-contained, Dzus-mounted unit. The AA22 is a
line driver for remote mounted power amplifiers. The AA22-110 or AA22-160 is typically used with the
PA110 or PA220, while the AA22-492 or AA22-493 is typically used with the PA250 or PA700.
1.3 Design Features
Microphone interfacing is accomplished from either an AA9x/AMS4x series audio controller, or a ‘carbon
equivalent’ microphone. A radio audio input is provided to allow for radio 'rebroadcast' operation. The
siren is adjustable for tone, rate and level. Provision is made for external power switching to activate
PA110/220 power amplifiers.
All external connectors, switches and relay contacts are gold plated for maximum reliability. Switches and
relays are sealed. G10-FR flame retardant circuit boards are post coated 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
Power +22 to 32 Vdc (28 Vdc nom) at 250 mA max (excl. lamps).
Internally grounded case
Panel Lamps
2 ea. type #387 for 28 Vdc operation
Maximum lamp load 80 mA
Inputs
Mic 0.25 Vrms at 150
Ω
PA and Radio 2.5 Vrms at 3.3
Ω
Circuitry Single-ended
Microphone Industry
standard ‘carbon equivalent’ or amplified dynamic
microphone preferred
Min. 200 mV output required into 150
Ω
David Clark M1/DC, M4, M7 recommended