ARINC 708-6 : 1991

1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose of this Equipment
1.2 Purpose and Limitations of this Characteristic
1.3 System Description
1.4 Interchangeability
1.5 Regulatory Approval
1.6 Reliability
2.0 INTERCHANGEABILITY STANDARDS
2.1 Form Factors, Connectors and Index Pin Coding
2.2 Mounting Trays for T-R Units
2.3 Antenna Unit Form Factor and Connectors
2.4 Display Unit Form and Connector
2.5 Control Unit
2.6 Interwiring
2.7 Power Circuitry
2.8 Weights
2.9 Environmental Conditions
2.10 Stabilization Signal Characteristics
2.11 Stabilization Signal Loading
2.12 Radome
2.13 RF Transmission Line
2.14 Cooling-General
2.15 Antenna Mount
2.16 Antenna Gain Compensation
2.17 Environmental Conditions
2.18 Grounding and Bonding
2.19 Transmission Line Pressure
2.20 System Configuration Programming Pins
2.21 Display Data Bus Termination
3.0 SYSTEM DESIGN AND PERFORMANCE REQUIREMENTS
3.1 Range Performance, Weather
3.2 Performance Index
3.3 Range Performance, Ground Mapping
3.4 Range Displays
3.5 Display Sector (Scan Angle)
3.6 Display Visibility
3.7 Iso-Echo-Contour
3.8 Radio Frequency
3.9 Self-Test
3.10 Operating Conditions3.11 Accuracy of Display
3.12 Dual Operation
3.13 Sensitivity Time Control (STC)
3.14 Turbulence Detection
3.15 Color Displays
3.16 Control Hierarchy
3.17 Antenna Tilt Control
3.18 Anti-Clutter
3.19 Automatic Weather/Turbulence Alert
3.20 Control Data Bus
3.21 Display Data bus
3.22 LRU Failure Indicator
3.23 Auxiliary Data Bus
3.24 Master/Slave Operations
3.25 ON/OFF Control
4.0 TRANSMITTER-RECEIVER UNIT DESIGN
4.1 General
4.2 Automatic Gain Control (AGC)
4.3 STC
4.4 Automatic Frequency Control (AFC)
4.5 Range Resolution
4.6 Receiver Dynamic Range
4.7 Antenna Stabilization
4.8 Serial Digital Control Input
4.9 Serial Digital Data Output
4.10 Test Facilities
4.11 Service Adjustments
4.12 Time Counter
4.13 Cooling
4.14 Magnetic Field
4.15 Waveguide Window
5.0 ANTENNA UNIT DESIGN
5.1 Design Criteria
5.2 Scan Angle and Rate
5.3 Tilt
5.4 Stabilization
5.5 Beam Width and Shape
5.6 Mounting
5.7 Antenna Gain Compensation
6.0 CONTROL DISPLAY UNIT (CDU)
6.1 General Design Criteria
6.2 Controls
6.3 Screen
6.4 Focusing
6.5 Resolution
6.6 Panel Lighting
6.7 Deflection System
6.8 Shielding
6.9 Control Data Bus
6.10 Display Data Bus
6.11 Auxiliary Data Bus
6.12 System Performance Annunciator
6.13 Cooling
6.14 Auxiliary Data Display
6.15 Caution and Mode Indicators
7.0 SEPARATE DISPLAY UNIT (DU) DESIGN
7.1 General
7.2 Controls
7.3 Display Data Bus
7.4 Cooling
7.5 Auxiliary Data Bus
8.0 CONTROL PANEL DESIGN
8.1 General
8.2 Controls
8.3 Control Data Bus
9.0 RADOME DESIGN
9.1 General
9.2 Transmissivity
9.3 Incident Reflection
9.4 Sidelobe Levels
9.5 Anti-Icing
9.6 Bore Sight Errors
10.0 PROVISIONS FOR AUTOMATIC TEST EQUIPMENT
10.1 General
10.2 Unit Identification
10.3 Use of ATLAS Language
11.0 BUILT-IN TEST EQUIPMENT (BITE)
11.1 Built-In Test Equipment (BITE)
11.2 Display
11.3 Fault Monitor
11.4 Self-Test Initiation
11.5 Monitor Memory
11.6 Monitor Memory Output
ATTACHMENTS
1 Notes Applicable to Standard Interwiring
2-1 Single System Standard Interwiring (Single or
       Dual Displays)
2-2 Dual System Standard Interwiring (Single or Dual Displays)
3 Transmitter/Receiver Connector Layout
4-1 Transmitter/Receiver Form Factor (X-Band)
4-2 Transmitter/Receiver Form Factor (C-Band)
4-3 Waveguide Connection X-Band Outline
4-4 Waveguide Connection T-R Unit (X-Band)
4-5 Waveguide Connection Rack Unit (X-Band)
4-6 Dual Installation (X-Band)
5 Control/Display and Display Connector Layout
6-1 Display Form Factor
6-2 Display Mount
7-1 Control Panel Connector Layout
7-2 Control Panel Form Factor
8-1 Standard Aircraft Mounting Provisions for Antenna
8-2 Antenna Space Provisions (Maximum Swept Volume)
8-3 Analysis of Antenna Mounting Roll Tolerances
9 Antenna Connector Layout
10-1 Antenna Form Factor (X-Band Line of Sight)
10-2 Antenna Form Factor (C-Band Line of Sight)
11-1 Installation Configurations 0, 2 and 4 (Single T/R)
11-2 Installation Configurations 1, 2 and 5 (Single T/R-Dual
       Display)
11-3 Installation Configuration 6 (Single T/R-Triple Display)
11-4 Installation Configurations 0, 2 and 4 (Dual T/R)
11-5 Installation Configurations 1, 2 and 5 (Dual T/R-Dual
       Display)
11-6 Installation Configuration 6 (Dual T/R-Triple Displays)
11-7 Control Bus Usage
11-8 Data Bus Usage
12 Performance Index Curves
13 Radar Stabilization Tolerances Summary
14 Environmental Test Categories
15-1 Weather Radar Serial Control Data
15-2 Weather Radar Display Data Bus Format
16 Installation Configuration Programming
17 Display Data Bus Termination
18 Auxiliary Data Bus Interface
19 International Standards Organization Code No.5
20 Waveguide Switch Electrical Interface

Describes the characteristics of WXR equipment intended for installation in commercial transport aircraft.