Garmin GDL 90 Installation Manual

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General InformationGDL 90 Installation Manual 560-1049-00 Rev B 1-71.3.7 ANTENNA REQUIREMENTS1.3.7.1 GPS Antennas1.3.7.1.1 A-33 (590-1104)Early production runs of PN 590-1104 were marked with TSO-C129a. This antenna was re-qualified toTSO-C144 with no changes to the antenna. P/N 590-1104 antennas marked with TSO-C129aidentification are identical to those marked with TSO-C144.Applicable TSO: .........................................................TSO-C144 (RTCA/DO-228 with Change No. 1)Frequency: .....................................................1575 MHzPolarization:...................................................Right Hand CircularAxial Ratio:....................................................3 dB Max at bore siteRadiation Coverage: ......................................Elevation Angle Minimum Gain>15º -2.0 dBic10º -3.0 dBic5º -4.5 dBic0º -7.5 dBicFinish: ............................................................Polyurethane EnamelWeight: .........................................................3.9 oz. (0.11 kg)Height: ..........................................................0.61 inches (1.55 cm)Operating Temperature: ................................-55°C to +85°COperating Altitude: .......................................55,000 feet (16,764m) max.Amplifier:Gain.........................................................26.5 dB ±2 dBNoise Figure:...........................................2.5 dB MaxImpedance: ..............................................50 ohmsVSWR (Dry): ..........................................< 1.5:1VSWR (Rain):.........................................< 2.0:1Band Rejection:.......................................35 dBPower Handling: .....................................1 WattVoltage:...................................................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 nanosecondPass Band Ripple (3dB bandwidth) …….0.2 dB max