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Page 4-2 G3X Installation Manual – GSU 73
Revision A 190-01115-01
4.1.1 Features Summary
Air Data Interfaces
Pressure Altitude CAN (1)
Density Altitude RS-232 (2 TX/2 RX)
Vertical Speed ARINC 429 (4 RX/2 TX)
Mach Number OAT Probe (GTP 59)
Indicated Airspeed Magnetometer (GMU 44) (1 RS-232 TX/ 1 RS-485 RX)
True Airspeed
AHRS
Engine/Airframe
Magnetic Heading 28 Analog inputs, including those allocated as per below:
Pitch Angle Dedicated Ammeters (2)
Roll Angle Constant Current Source Capability (6)
Linear Accelerations Divider Circuits to handle large input voltages (12)
Pitch, Roll, Yaw Rotation Rates Frequency Counter Inputs (4)
Discrete I/O (4 In/2 Out)
4.2 Electrical Specifications
Table 4-1. GSU 73 Supply Specifications
Characteristic Specification
Input Voltage Range 10-29 Vdc*
Power Input
1.75 Amp @ 14 Vdc (Max)
0.80 Amp @ 28 Vdc (Max)
*Garmin recommends using a Mod 1level GSU 73 in aircraft that exclusively use a +28V supply.