Garmin GDL 90 Installation Manual

Also see for GDL 90: Installation manual

General InformationGDL 90 Installation Manual 560-1049-00 Rev B 1-5Temperature variation....................................5°C per minuteHumidity ........................................................95% at 65°CMaximum continuous altitude .......................55,000 feetDecompression ..............................................55,000 feetExternal Cooling............................................Not required with internal fans operational andvents unobstructedWater-resistant...............................................with vertical mounting and optional cover1.3.4 GPS/WAAS RECEIVER PERFORMANCETSO Compliance ...........................................TSO-C145a (RTCA/DO-229C)Number of channels.......................................15 (12 GPS and 3 GPS/WAAS/SBAS)Frequency ......................................................1575.42 MHz L1, C/A codeSensitivity (acquisition).................................-116 dBm to -134.5 dBm GPS-116 dBm to -135.5 dBm WAASSensitivity (drop lock) ...................................-144 dBmDynamic range...............................................> 20 dBLat/Long position accuracy ...........................<1 meter RMS typical with WAAS(horizontal/vertical)Velocity .........................................................1000 knots maximum (above 60,000 ft)TTFF (time to first fix) ..................................1:45 min. typical with current almanac, position, andtimeReacquisition ....................................10 seconds typicalPosition update interval ....................0.2 sec (5 Hz)1 pps (pulse per second) ...................±275 nsec of UTC secondDatum ...............................................WGS-84SATCOM compatibility ...................Compatible on aircraft equipped with SATCOMAntenna power supply ......................35 mA typical, 40 mA max at 4.7 VDC1.3.5 UAT PERFORMANCETSO Compliance ...........................................TSO-C154 (RTCA/DO-282)Frequency ...................................................... 978.00 MHzTransmit Power.............................................. 50 W (+47 dBm)Frequency Tolerance .....................................+/- 20 PPMModulation.....................................................Continuous Phase FSK, h = 0.6, Raised Cosineshaping, a = 0.5Data Rate .......................................................1.04 Mbps99% Power Bandwidth ..................................1.3 MHz