The IFR Aeroflex DF-7708 is a test interface matrix that bridges test systems and ARINC 708 weather radar units under test. It manages all non-RF interfaces—power distribution, discrete signal control, analog voltage sourcing, and data bus routing—according to ARINC-708 specifications. The unit integrates with WRX and WRC-7708 weather radar test systems and operates under control of a 24-line by 80-character CRT monitor and hex keypad, presenting all functions in ARINC-708 terminology.
Technical Specifications
• Four programmable ARINC-708 control bus outputs with independent data and transmission rate control
• Two attitude bus outputs (onside and offside) with independent programmable parameters
• Three ARINC-708 data bus outputs with four selectable patterns: X/Y crosshatch, bar, arc, and sector
• Six programmable high-speed and low-speed I/O buses
• Low Speed Bit Rate: 12.6 kHz
• High Speed Bit Rate: 100 kHz
• Data Bus Bit Rate: 1 MHz
• Control and data bus message transmission rate: 0 to 255 messages per second in 1 message per second increments
• Selected display capability for one of four input control buses and one of three input data buses
– Key Features
• Sources analog three-wire and two-wire voltages to the unit under test
• Sources Johnson Code drive for Collins Antenna Pedestal
• Routes ARINC control buses, digital attitude buses, and data buses to appropriate UUT connector pins
• Controls and monitors all discrete signals per ARINC-708 specification
• Controls and monitors UUT power distribution
• Front panel test points for signal monitoring on all UUT connector pins
• Unique interface cables provided for each UUT type
– Typical Applications
Weather radar system development, integration testing, and production validation in aviation platforms requiring ARINC 708 compliance.
– Compatibility & Integration
Designed for use with WRX and WRC-7708 weather radar test systems. Compatible with Rockwell Collins weather radar systems when used with the STD-7000A digital controller and RDX-7708R/RDX-7708BRW equipment.
