GRA™ 55

Physical Characteristics

• Unit Height (with mounting rack): 3.99” (101.3 mm)
• Unit Width (with or without mounting rack): 3.02” (76.7 mm)
• Unit Depth (with mounting rack and connector): 11.62” (295.2 mm)
• Unit Depth (with mounting rack, connector and configuration module): 12.08” (306.9 mm)
• Unit Weight (with mounting rack): 3.5 lbs (1.6 kg)
• Typical Mating Circular Connector Weight: 0.13 lbs (0.06 kg)
• Typical Mating RF Connector Weight (2X): 0.07 lbs (0.03 kg) (weight listed is for 2 connectors)

General Specifications

• Operational Temperature Range: -55° C to +85° C
• Altitude Range: 31,000 ft maximum
• Software Compliance: RTCA/DO-178B Level C
• Hardware Compliance: Not Applicable - The GRA 55 does not contain any complex or programmable logic devices
• Environmental Conditions: RTCA/DO-160F

Performance Specifications

• Altitude Accuracy: ± 1.5 ft (3 - 100 ft AGL); ± 2 % (> 100 - 2500 ft AGL)
• Altitude Range: -20 - 2550 ft AGL
• Altitude Alert Outputs Range: 0 - 2500 ft AGL
• Altitude Output Time Constant: 0.1 second maximum
• Transmitter Output: Frequency: 4.25 - 4.35 GHz "Gated" FMCW; Power: 1.0 W nominal
• Horizontal Velocity: 0 - 200 knots maximum
• Vertical Velocity: 20 ft/sec maximum (up to 100 ft AGL); 25 ft/sec maximum (above 100 ft AGL)
• Pitch Angle: ± 20° maximum
• Roll Angle: ± 20° maximum (with published altitude accuracy limits); ± 20° to ± 30° (with ± 20 % altitude accuracy limits throughout entire altitude range)

Power Requirements

• Supply Voltage: 14/28 VDC. See the Environmental Qualification Form for details on surge ratings and minimum/maximum operating voltages
• Power Consumption: 13.75 W maximum (0.5 A at 27.5 VDC, 1.0 A at 13.75 VDC)