Page 2-2
G300 Installation Manual – GDU 37X
Revision A
190-00921-01
2.1.3
Interface Summary
The GDU 37X uses CAN and RS-232 communications interfaces. The GDU 37X communicates with the
following Garmin LRUs:
•
Other GDU 37X
•
GSU 73 ADAHRS/Engine LRU
•
SL40 Comm Transceiver
2.2
Electrical Specifications
2.2.1
Electrical Characteristics
Table 2-1. GDU 37X Supply Voltages
Characteristics Specifications
Power Requirements
14/28 VDC
2.2.2
Power Consumption
Table 2-2. GDU 37X Power Requirements
LRU
14V (Maximum)
14V (Typical)
28V (Maximum)
28V (Typical)
GDU 370
15W, 1.10 Amp
8.5W, .600 Amp
15W, 0.540 Amp 8.5W, .300 Amp
GDU 375
15W, 1.10 Amp
9.5W, .675 Amp
15W, 0.540 Amp 9.25W, .330 Amp
2.2.3
GPS Specifications
The GDU 37X uses a WAAS enabled, high-sensitivity GPS receiver that continuously tracks and uses up
to 12 satellites to compute and update it’s position.
Table 2-3. GDU 37X GPS Specifications
Characteristics Specifications
Acquisition Time
a)
Warm Start (position known to 10 nm, time known to 10
minutes, with valid almanac and ephemeris): Less than 5
seconds
b)
Cold Start (position known to 300 nm, time known to 10
minutes, with valid almanac): Less than 45 seconds
c)
AutoLocate™ (with almanac, without initial position or
time): Less than 60 seconds
Update Rate
5/second, continuous
Positional Accuracy
<10 meters
Velocity Accuracy
0.05 meter/sec steady state
Antenna power supply
Voltage (4.5 to 5.0), current (50 mA max)
Max Input Signal
40dB
