General Information
1-6
560-1049-02 Rev. B
GDL 90 Installation Manual
1.3.7 Antenna
Requirements
1.3.7.1 GPS
Antennas
The GDL 90 may be installed with the Garmin AT A-33 and A-34 GPS antennas. The following table
summarizes the antenna identification.
Model/Description Mount
Style
Manufacturer
Part
Number
Order
Number
Aero Antenna
575-9
N/A
A-33, GPS WAAS
Antenna
Screw Mount
Garmin AT
590-1104
N/A
Aero Antenna
575-93
013-00113-00
A-34, GPS WAAS
Antenna
Screw Mount,
Teardrop Footprint
Garmin AT
590-1112
013-00113-00
1.3.7.1.1 A-33 (590-1104)
Early production runs of PN 590-1104 were marked with TSO-C129a. This antenna was re-qualified to
TSO-C144 with no changes to the antenna. P/N 590-1104 antennas marked with TSO-C129a
identification are identical to those marked with TSO-C144.
Applicable TSO.......................................................... TSO-C144 (RTCA/DO-228 with Change No. 1)
Frequency...................................................... 1575 MHz
Polarization ................................................... Right Hand Circular
Axial Ratio .................................................... 3 dB Max at bore site
Radiation Coverage....................................... Elevation Angle
Minimum Gain
>15º -2.0
dBic
10º -3.0
dBic
5º -4.5
dBic
0º -7.5
dBic
Finish............................................................. Polyurethane Enamel
Weight ........................................................... 3.9 oz. (0.11 kg)
Height............................................................ 0.61 inches (1.55 cm)
Operating Temperature .............................................. -55°C to +85°C
Operating Altitude...................................................... 55,000 feet (16,764m) max.
Amplifier:
Gain ........................................................ 26.5 dB ±2 dB
Noise Figure ........................................... 2.5 dB Max
Impedance............................................... 50 ohms
VSWR (Dry)........................................... < 1.5:1
VSWR (Rain) ......................................... < 2.0:1
Band Rejection ....................................... 35 dB
Содержание GDL 90
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Страница 8: ...Table of Contents vi 560 1049 02 Rev B GDL 90 Installation Manual Notes ...
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