Northern Airborne Technology 211 - Manual (Page 9)

Model 211 Voice Activated Switch
SM211 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 2 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
Model 211 Voice Activated Switch. 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 Model 211 Voice Activated Switch is designed to reduce noise from a HOT microphone when the
operator is not talking. It activates on a preset voice level from an amplified dynamic microphone, and
supplies the microphone with the correct bias current.
1.3 Design Features
The unit turns on within 1.5 milliseconds after the operator starts talking, and turns off (attenuates
microphone noise by 30dB minimum) within 2 seconds after the operator stops talking.
1.4 Specifications
1.4.1 Electrical Specifications
Power 28 Vdc, 80 Milliamps (max)
Squelch Level:
Internal 15 to 350 mVrms (accessible through cover)
External 40 to 350 mVrms (via remote 10 K potentiometer)
1.4.2 Physical Specifications
Height 1.60" (40.64 mm)
Depth 4.00" (101.60 mm) including flanges
Width 3.00" (76.20 mm)
Weight 0.35 lbs (15.9 g)
Mounting Any attitude
1.4.3 Environmental Specifications
Operating Temperature -55
° to +79° C
Section 1 ends