Antennas; Table B-7 - Supported Gps & Sxm Antennas; Table B-8 - Gps Or Gps/Waas Antenna Minimum Requirements - Garmin G3X Touch Maintenance Manual

B.8 Antennas
This section contains general information for interfaced GPS, GPS/WAAS, SXM, and ADS-B antennas.
This STC provides installation approval only for the Garmin glareshield-mounted GPS Antenna (011-
04036-00), refer to the G3X Touch EFIS Part 23 AML STC Installation Manual (190-02472-01) for
installation guidance. All other antennas are approved as interface only and require separate installation
approval.
A minimum of one GPS antenna is required for G3X installations as the connected GDU (PFD) will share
GPS data with the second GDU (if installed). Additional GPS antennas may be used for redundancy but
are not required.
Make & Model
Comant 2480-201
(GPS/VHF Com)
Garmin Glareshield GPS
Antenna
Garmin GA 56
Garmin GA 37
(GPS/SXM)
Garmin GA 55
Garmin GA 55A
The GPS antenna interface on the GDL 5XR is not used in this STC.
Only the SXM connection to the GA 37 antenna is approved in this STC. The GPS connection to the GA
37 is not compatible with any G3X LRUs but might be used for other installed equipment under their
respective interface approvals.
Also note that if a previously installed G5 is connected to a GPS antenna mounted externally on the
airframe, that antenna must be disconnected when the G5 is used as a standby instrument for G3X. It
may be possible to repurpose the external antenna for other avionics if it is compatible under their
respective interface approvals.
The GPS antenna should provide a gain of 16 to 25 dB. The GDU 4X0 supplies power to the antenna at
4.5-5.5 VDC with a maximum current of 50 mA.
The following information describes antenna performance requirements for proper system functionality.
Table B-8 – GPS or GPS/WAAS Antenna Minimum Requirements
Characteristics
Frequency Range
Gain
Noise Figure
Nominal Output Impedance
Supply Voltage
Supply Current
Output Connector
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
Table B-7 – Supported GPS & SXM Antennas
Approved G3X
P/N
Function
CI 2480-201 GPS
011-04036-
GPS
00
011-00134-
GPS
00
013-00245- SXM
00
011-01033- SXM
00
011-01153- SXM
00
Page B-15
LRU
Connection
GDU 4X0 Blade antenna, external
Glareshield mounted via hook &
GDU 4X0
loop or screws
GDU 4X0 Stud mount, teardrop, external
GDL 51R/52R ARINC 743, external
GDL 51R/52R Stud-mount, teardrop, external
GDL 51R/52R Through-mount, ARINC 743,
external
Specifications
1565 to 1585 MHz
16 to 25 dB typical, 40 dB max.
<4.00 dB
50Ω
4.5 to 5.5 VDC
up to 50 mA
BNC or TNC
Mounting
190-02472-02
Revision 2