Northern Airborne Technology 806 - Manual (Page 7)

806 and 807 Audio Selector Panels
SM806 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 806
and 807 Audio Selector Panels. 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 806 and 807 Audio Selector Panels are each designed to control a separate 700 series Digital Audio
Control Amplifier. They provide microphone audio switching and keying operations for radio transmitters,
receivers and passenger address (PA) amplifier control.
1.3 Design Features
The 806 and 807 Audio Selector Panels continuously read the status of their own front panel switches
and potentiometers and compile this information into the form of a digital signal, which is sent to the
appropriate Model 700 in RS-422 serial format. The Model 700 receives, demultiplexes and converts this
digital signal into useful audio control information.
The 806 and 807 Audio Selector Panels are capable of digitally controlling all Model 700 amplifier
functions. These include the receiver input switches and individual volume controls, the sidetone input
switches and sidetone volume control, the microphone input switch, the interphone switches and volume
control, the cockpit speaker switch and volume control, the headphone volume control and the NAV/ADF
Voice/Ident filter switching functions.
The Audio Selector Panels have several dedicated hardwired switches. Both the 806 and 807 Audio
Selector Panels have MIC, HF, AUTO-COMM, SPKR, BOTH/VOICE/IDENT, GYRO MODE SEL and
SLEW switches. In addition, the 806 has AUDIO, MKR, ADC, CDU REV, AHRS and TDR switches.
1.4 Specifications
1.4.1 Electrical Specifications
Operating Voltage 27.5 Vdc nominal
(normal) 22.0 Vdc minimum
30.3 Vdc maximum
18.0 Vdc emergency
Operating Voltage 27.5 Vdc nominal
(abnormal) 20.5 Vdc minimum
32.2 Vdc maximum
Input Current 150 mA maximum
Lighting Voltage 115Vac, 400Hz, 20 mA rms max.