Uat/1090 Requirements; Gps Antenna Requirements - Garmin GDL 88 Installation Manual

1.3.7 UAT/1090 Requirements

The GDL 88 requires UHF antenna(s) meeting the following specifications:
Vertically polarized
The VSWR produced by the antenna does not exceed 1.7:1 at 978 MHz and 1.5:1 at 1090 MHz.
TSO-C66, TSO-C74, or TSO-C112 antennas that also meet the VSWR specification.
Certain types of transponder antennas that utilize very thin radiator elements are only
intended for use at 1030 and 1090 MHz. These types of antennas should be evaluated on
a model-by-model basis to determine their suitability as UAT data link antennas.
Operating the GDL 88 without RF terminations on the top or bottom UAT antenna ports
can result in equipment damage. Always operate the GDL 88 with the top and bottom
UAT antenna ports terminated with a VSWR ration of 3.0:1 or less.

1.3.8 GPS Antenna Requirements

Antenna performance is critical to the GPS/SBAS operation. The antennas listed in Table 1-8 provide
acceptable performance with the GDL 88.
Model/Description
GA 35, GPS/WAAS
[1]
GA 36, GPS/WAAS
GA 37, GPS/WAAS/XM
A33W, WAAS Antenna
GPS/VHF Antenna
GPS/VHF Antenna
GPS/XM/VHF Antenna
GPS/XM/VHF Antenna
GPS/WAAS Antenna
GPS/XM Antenna
[1] Same mounting hole pattern as GA 56, but GA 35 antenna has a physically larger footprint.
[2] The antenna connector is a TNC type. The VHF connector is a BNC type.
[3] The antenna connector is a TNC type. The XM connector is a TNC type. The VHF connector is a
BNC type.
GDL 88 TSO Installation Manual
190-01122-00
NOTE
CAUTION
Table 1-8. Approved GPS/SBAS Antennas
Conn Type Mfr
Garmin
TNC
Aero Antenna
Garmin
TNC
Aero Antenna
Garmin
TNC
Aero Antenna
Garmin
TNC
Aero Antenna
TNC/BNC
Comant
[2]
TNC/BNC
Comant
[2]
TNC/TNC/BNC
Comant
[3]
TNC/TNC/BNC
Comant
[3]
TNC Comant
TNC/TNC Comant
Part Number
013-00235-( )
AT575-93G( )-TNCF-000-RG-27-NM
013-00244-( )
AT575-126G( )-TNCF-000-RG-27-NM
013-00245-( )
AT2300-126G( )-TNCF-000-RG-27-NM
013-00261-( )
AT575-332G( )- TNCF-000-RG-27-NM
CI-2580-200
CI-2728-200
CI-2580-410
CI-2728-410
CI-428-200
CI-428-410
Garmin
Order
Number
013-00235-( )
013-00244-( )
013-00245-( )
013-00261-( )
N/A
N/A
N/A
N/A
N/A
N/A
Page 1-5
Rev. A