General Information
GDL 90 Installation Manual
560-1049-02 Rev. B
1-7
Power Handling ...................................... 1 Watt
Voltage ................................................... 5 VDC ±10%
Current .................................................... 35 mA nominal, 40 mA max.
L1 Filter Bandwidth ............................... 1575 ±20 MHz (3 dB)
+110, -210 MHz (60dB)
Group Delay (3dB bandwidth) ............... 27 ±10 nanosecond
Pass Band Ripple (3dB bandwidth) …….0.2 dB max
1.3.7.2 A-34
(590-1112)
The Garmin AT A-34 is an acceptable antenna. For specifications of the A-34 antenna, refer to the latest
revision of P/N 560-5047-( ).
1.3.7.3 UAT
Antenna
The GDL 90 requires a UHF antenna meeting the following specifications:
•
Standard 50
Ω
vertically polarized antenna with a VSWR < 1.7:1 at 978 MHz
•
TSO-C66, C74, C112 or C154 antennas that also meet the VSWR specification.
Table 1-1. Garmin UAT Antennas
Antenna Model and Part Numbers
Installation Manual
Notes
A-40 (P/N 590-0052)
P/N 560-0253-xx
Open Circuit
A-41 (P/N 590-0051)
P/N 560-0215-xx
DC Grounded
NOTE
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.
CAUTION
Operating the GDL 90 without RF terminations on the Top or Bottom UAT Antenna
ports can result in equipment damage. Always operate the GDL 90 with the Top and
Bottom UAT Antenna ports terminated with a VSWR ratio of 3.0:1 or less.
Содержание GDL 90
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