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GDU 37X Installation Manual – Antennas Page 3-1
190-01054-01 Revision B
3 Garmin GPS/XM Antennas
For non-Garmin antennas, follow the manufacturer’s installation instructions. If using a Garmin GA 26C
or GA 26XM, refer to the accompanying installation instructions (190-00082-00 or 190-00522-03). For
GA 55/55A, GA 56, or GA 57X antennas, refer to this section.
Garmin recommends the antennas shown in Tables 3-1 and 3-3. However, any equivalent GPS or XM
antenna that meets the specifications listed in Tables 3-2 and 3-4 should work with the GDU 37X.
3.1 GPS Antennas
Table 3-1. GPS Antennas
Model
Part
Number
Description Weight Mounting Configuration
GA 26C 011-00149-04 GPS Antenna NA
Flange, Magnetic, or Suction
Cup Mount (for in-cabin
mounting)
GA 56 011-00134-00 GPS Antenna 0.24 lbs (0.11 kg)
Stud mount, (Tear-drop form
factor)
GA 57X 011-01032-10 GPS/XM Antenna 0.47 lbs (0.21 kg)
Thru-mount (ARINC 743 style
mount)
Table 3-2. GPS Antenna Minimum Requirements
Characteristics Specifications
Frequency Range 1565 to 1585 MHz
Gain 16 to 25 dB typical, 40dB max.
Noise Figure <4.00 dB
Nominal Output Impedance 50 ohms
Supply Voltage 4.5 to 5.5 VDC
Supply Current up to 50 mA
Output Connector BNC
3.2 XM Antennas
Table 3-3. XM Antennas
Model
Part
Number
Description Weight Mounting Configuration
GA 26XM 013-00268-10 XM Antenna NA
Flange, Magnetic, or Suction
Cup Mount (for in-cabin
mounting)
GA 55 011-01033-00 XM Antenna 0.25 lbs (0.11 kg)
Stud mount (Tear-drop form
factor)
GA 55A 011-01153-00 XM Antenna 0.43 lbs (0.20 kg)
Thru-mount (ARINC 743 style
mount)
GA 57X 011-01032-10 GPS/XM Antenna 0.47 lbs (0.21 kg)
Thru-mount (ARINC 743 style
mount)