Garmin GDL 90 Installation Manual

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General Information1-8 560-1049-00 Rev B GDL 90 Installation Manual1.3.7.1.2 A-34 (590-1112)Early production runs of PN 590-1112 were marked with TSO-C129a. This antenna was re-qualified toTSO-C144 with no changes to the antenna. P/N 590-1112 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: ......................................................... 7.0 oz. (0.2 kg)Height: .......................................................... 0.66 inches (1.76 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