General Information
1-10
560-0982-01 Rev A
GNS 480 (CNX80) Installation Manual
Frequency range ............................................ 329.150 to 335.00 MHz
Frequency tolerance ...................................... 0.0008%
Cross modulation products............................ At least 60 dB down
Receiver sensitivity ....................................... -95 dBm typical
Centering error .............................................. RTCA DO-195 two sigma limit: 6.7% of full scale
GNS 480 performance: less than 2.0% typical (3.0 mV)
1.3.8.4 Computation
Rates
The tuned active frequency is computed 10 times per second. If the VOR monitor function is activated,
20% of each second is allocated to the monitored frequency, slightly decreasing the active to frequency
computation rate. It is important to note that the monitored frequency is only updated once per second.
1.3.9 A
VIONICS
I
NTERFACES
1.3.9.1 Main CDI (GPS or VHF Nav)
1.3.9.1.1 Deviations / Flags / Annunciators
CDI L/R deviation.........................................
±
150 mv full scale (200
Ω
load max)
TO/OFF/FROM flag .....................................
±
250 mv, TO/FROM (200
Ω
load max)
Nav valid flag................................................ +300 mv for valid indication (200
Ω
load max)
Nav superflag ................................................ Vin - 2 volts (minimum) for valid, source capability
of 400 mA
VDI up/down................................................. ±150 mv full scale (200
Ω
load max)
VDI valid flag ............................................... +300 mv for valid indication (200
Ω
load max)
VDI superflag................................................ Vin - 2 volts (minimum) for valid, source capability
of 400 mA
GPS/Nav Annunciators ................................. Open collector outputs capable of sinking up to 400
mA for turning ON annunciator lamps
1.3.9.1.2 OBS Resolver
TSO/JTSO compliance ................................. TSO-C40c (DO-196)/JTSO-2C40
Applicable documents................................... RTCA DO-196
Operational class ........................................... N/A
Accuracy category......................................... B {-46
o
C to + 55
o
C}
Output signal ................................................. 300 Hz
±
2 Hz (rounded square wave)
Output voltage (automatically
adjusted during calibration) .......................... 5 Vpp to 10 Vpp
Input voltage max (calibrated) ...................... 5 Vpp (when OBS is set to maximum)
Resolver voltage gain (loss) .......................... 1:1 maximum, 2:1 minimum
Output loading at max voltage ...................... 100 ohms impedance
Accuracy/Resolution..................................... 0.25
o
rounded to 1
o
steps
Summary of Contents for GNS 480
Page 1: ...GNS 480 CNX80 Color GPS Nav Com Installation Manual September 2004 560 0982 01 Rev A...
Page 10: ...Table of Contents viii 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 30: ...General Information 1 20 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 126: ...Periodic Maintenance 6 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
Page 150: ...Appendix D Interconnect Diagrams D 2 560 0982 01 Rev A GNS 480 CNX80 Installation Manual NOTES...
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