Northern Airborne Technology 802 - Manual (Page 5)

802-009 Switch Panel
SM802 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
802-009 Switch Panel. 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 802-009 Switch Panel is designed to control a single Model 700-xxx Digital Audio Control Amplifier. It
also provides microphone audio switching and keying operations for four radio transmitters in addition to
features such as antenna switching unit control, marker (MKR) receiver sensitivity control and public
address (PA) amplifier control. The 802-009 Switch Panel continuously reads the status of its own audio
control switches and volume control potentiometers and compiles this information into the form of a digital
signal. The digital signal is sent to the Model 700 from the switch panel in RS422 serial format via a
twisted, shielded wire pair. The Model 700 receives, demultiplexes and converts this digital signal into
audio control information.
1.3 Design Features
The 802-009 Switch Panel is capable of digitally controlling all Model 700 amplifier functions. These
include the 12 receiver input switches and individual volume controls, the four sidetone input switches
and sidetone volume control, three microphone inputs, the microphone input switch, antenna switching,
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 802 Switch Panel is a customizable unit capable of providing control for up to four transceivers, eight
receivers and a public address. For information on other configurations, contact the Product Support
Department at NAT Ltd.
Panel nomenclature and knob illumination is provided on the 802-009 Switch Panel. The power supply
inputs for the panel overlay and knob internal light plate are independent of each other and may be lit at
different levels of brightness. The MIC SELECT knob and the NORM MIC/OXY MIC knob are lit with the
panel overlay. Neoprene washers are installed around each of the volume control knobs between the
overlay and front panel sheet metal to prevent light leakage from being radiated by the knob illuminating
light plate into the cockpit. The PHONE and PASS knobs are always in the OUT and lighted position,
since there is no switching associated with them.