Garmin GDL 90 Installation Manual page 15

1.3.7 A
NTENNA
1.3.7.1 GPS Antennas
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
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
Power Handling: .....................................1 Watt
Voltage:...................................................5 VDC ±10%
Current: ...................................................35 mA nominal, 40 mA max.
Group Delay (3dB bandwidth)................27 ±10 nanosecond
Pass Band Ripple (3dB bandwidth) .......0.2 dB max
GDL 90 Installation Manual
R
EQUIREMENTS
L1 Filter Bandwidth .........................1575 ±20 MHz (3 dB)
560-1049-00 Rev B
Minimum Gain
>15º -2.0 dBic
10º -3.0 dBic
5º -4.5 dBic
0º -7.5 dBic
+110, -210 MHz (60dB)
General Information
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