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Temperature variation....................................5 C per minute
Humidity ........................................................95% at 65 C
Maximum continuous altitude .......................55,000 feet
Decompression ..............................................55,000 feet
External Cooling............................................Not required with internal fans operational and
Water-resistant...............................................with vertical mounting and optional cover
1.3.4
GPS/WAAS R
TSO Compliance ...........................................TSO-C145a (RTCA/DO-229C)
Number of channels.......................................15 (12 GPS and 3 GPS/WAAS/SBAS)
Frequency ......................................................1575.42 MHz L1, C/A code
Sensitivity (acquisition).................................-116 dBm to -134.5 dBm GPS
Sensitivity (drop lock) ...................................-144 dBm
Dynamic range...............................................> 20 dB
Lat/Long position accuracy ...........................<1 meter RMS typical with WAAS
Velocity .........................................................1000 knots maximum (above 60,000 ft)
TTFF (time to first fix) ..................................1:45 min. typical with current almanac, position, and
Reacquisition ....................................10 seconds typical
Position update interval ....................0.2 sec (5 Hz)
1 pps (pulse per second) ................... 275 nsec of UTC second
Datum ...............................................WGS-84
SATCOM compatibility ...................Compatible on aircraft equipped with SATCOM
Antenna power supply ......................35 mA typical, 40 mA max at 4.7 VDC
1.3.5
UAT P
ERFORMANCE
TSO Compliance ...........................................TSO-C154 (RTCA/DO-282)
Frequency ...................................................... 978.00 MHz
Transmit Power.............................................. 50 W (+47 dBm)
Frequency Tolerance .....................................+/- 20 PPM
Modulation.....................................................Continuous Phase FSK, h = 0.6, Raised Cosine
Data Rate .......................................................1.04 Mbps
99% Power Bandwidth ..................................1.3 MHz
GDL 90 Installation Manual
vents unobstructed
P
ECEIVER
ERFORMANCE
-116 dBm to -135.5 dBm WAAS
(horizontal/vertical)
time
shaping, a = 0.5
560-1049-00 Rev B
General Information
1-5
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