GDU 37X Installation Manual Page 3-1190-01054-01 Revision C3 Garmin GPS/XM AntennasFor non-Garmin antennas, follow the manufacturer’s installation instructions. If using a Garmin GA 26Cor GA 26XM, refer to the accompanying installation instructions (190-00082-00 or 190-00522-03). ForGA 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 XMantenna that meets the specifications listed in Tables 3-2 and 3-4 should work with the GDU 37X.3.1 GPS Antennas3.2 XM AntennasTable 3-1 GPS AntennasModel Part Number Description Weight Mounting ConfigurationGA 26C 011-00149-04 GPSAntenna NA Flange, Magnetic, or Suction Cup Mount(for in-cabin mounting)GA 56 011-00134-00 GPSAntenna0.24 lbs(0.11 kg) Stud mount, (Tear-drop form factor)GA 57X 011-01032-10 GPS/XMAntenna0.47 lbs(0.21 kg) Thru-mount (ARINC 743 style mount)Table 3-2 GPS Antenna Minimum RequirementsCharacteristics SpecificationsFrequency Range 1565 to 1585 MHzGain 16 to 25 dB typical, 40dB max.Noise Figure <4.00 dBNominal Output Impedance 50 ohmsSupply Voltage 4.5 to 5.5 VDCSupply Current up to 50 mAOutput Connector BNCTable 3-3 XM AntennasModel Part Number Description Weight MountingConfigurationGA 26XM 013-00268-10 XM Antenna NAFlange, Magnetic, orSuction Cup Mount (forin-cabin mounting)GA 55 011-01033-00 XM Antenna 0.25 lbs (0.11 kg) Stud mount (Tear-dropform factor)GA 55A 011-01153-00 XM Antenna 0.43 lbs (0.20 kg) Thru-mount (ARINC 743style mount)GA 57X 011-01032-10 GPS/XM Antenna 0.47 lbs (0.21 kg) Thru-mount (ARINC 743style mount)
