ARINC 568 : 68 SUPP 8

1.0 Introduction and description
1.1 Purpose of this document
1.2 Functions and modes of operation
1.3 Unit description
1.3.1 Interrogator unit
1.3.2 Frequency control
1.3.3 Indicator
1.3.4 Antenna
1.4 Interchangeability
1.4.1 General
1.4.2 Interchangeability desired for the ARINC 568 DME
        system
1.4.3 "Generation interchangeability" considerations
1.5 Regulatory approval
2.0 Interchangeability standards
2.1 Introduction
2.2 Form factors, connectors & index pin coding
2.2.1 Interrogator
2.2.2 "Standard control panel"
2.2.3 Indicator
2.2.4 Antenna
2.3 Interwiring
2.4 Power circuitry
2.4.1 Primary power input
2.4.2 Power control circuitry
2.4.3 26 volt AC output
2.4.4 The AC common cold
2.4.5 The common ground
2.5 Standard outputs
2.6 Environmental conditions
2.7 Cooling
2.8 Grounding and bonding
3.0 System design
3.1 System application
3.2 Impact of all-weather landing program
3.3 Channel capacity
3.4 Channel selection
3.5 Range
3.6 Search speed
3.7 Outputs
3.7.1 Pilot's indicator
3.7.2 Aural output
3.7.3 Analog output for accessory systems
3.7.4 Distance trip outputs
3.8 Accuracy
3.9 Failure warning
3.10 Dual installations
3.11 Functional test
3.12 Integrity monitoring
3.13 Weights
4.0 Interrogator unit design
4.1 Channel capacity and selection
4.1.1 Channel capacity
4.1.2 Channel selection system
4.2 Decoder performance characteristics
4.3 Range
4.4 Tracking speed
4.5 Acquisition time
4.6 Search range limiting and ILS mode logic
4.6.1 200 nautical mile range limiting
4.6.2 Provisions for ILS-DME facilities
4.7 Memory
4.7.1 Accuracy during memory
4.8 Data outputs
4.8.1 Serial BCD distance
4.8.2 Analog distance
4.8.3 Range rate pulse
4.8.4 Distance trip data
4.8.5 Aural output
4.9 Accuracy
4.9.1 Digital output
4.9.2 Analog output
4.10 Warning "flag" alarm
4.11 RF power output
4.12 Interrogation rate
4.13 Interrogator pulse spectrum and characteristics
4.13.1 Frequency spectrum
4.13.2 Transmitter pulse interrogation coding
4.13.3 Transmitter pulse rise time
4.13.4 CW output
4.14 Transmitter frequency stability
4.15 Receiver sensitivity
4.16 Co-channel performance
4.17 Adjacent channel performance
4.17.1 On-channel signal present
4.17.2 No on-channel signal present
4.18 Interference rejection
4.18.1 Equipment damage
4.18.2 Performance degradation
4.19 TACAN azimuth provisions
4.20 Suppression pulses
4.21 Echo susceptibility
4.22 Functional test
4.23 Monitoring
4.23.1 Indicator status monitoring
4.23.2 Transmission line and antenna mounting
5.0 Control panel design
5.1 General configuration
5.1.1 Connector types
5.2 Common VHF NAV and DME frequency selectors
5.3 Off-on control
5.4 On-standby control
5.5 200 mile search range limit override switch
5.6 Volume controls
5.7 ARINC-519 glide slope frequency selection
5.8 Integral lighting
6.0 "Standard indicator" design
6.1 Standard distance indicator
6.1.1 26 VAC power input
6.1.2 Indicator range
6.1.3 Indicator accuracy
6.1.4 Display in absence of computer data
6.1.5 Display in event of equipment malfunction
6.1.6 Serial BCD input isolation
6.1.7 Indicator status output
6.2 Alternative DME indicators
6.3 Integral lighting
7.0 Antenna system
7.1 Antenna performance characteristics
7.1.1 Impedance and VSWR
7.1.2 Gain and polarization
7.1.3 Power rating
7.2 Installed antenna and transmission line system
7.2.1 Radiation pattern
7.2.2 Impedance and VSWR
7.2.3 Antenna isolation
7.3 Typical antenna physical configurations
7.3.1 Typical flush antenna
7.3.2 Typical blade antenna
8.0 Basic digital signal standards
8.1 Basic serial data transmission systems
8.1.1 Data transmission circuit
8.1.2 Word synchronization
8.1.3 Clock
8.2 Data message word structure
8.3 Transmission order
8.4 Electrical characteristics
8.4.1 DC signalling with non-return-to-zero logic
8.4.2 Signal logic levels
8.5 Digital transmitter
8.5.1 Output load capability
8.5.2 Electromagnetic noise rejection
8.5.3 Reverse current capability
8.6 Digital receiver
8.6.1 Input load characteristic
8.6.2 Electromagnetic noise rejection
8.7 Data circuit switching
Attachments
1 DME interrogator unit connector positioning
2 Standard interwiring
3.1 Serial BCD distance output word structure
3.2 Digital signal timing
3.3 Signal timing tolerances
3.4 BCD code assignment
3.5 DME input and output circuit standards
4 Possible means for derivation of analog distance
        from serial BCD distance output of ARINC 568 DME
5 Environmental test categories
6 Connector lower insert pin assignments
7 Standard control panel outline drawing
8 Control panel mounting plate assembly
9 Control panel connector index coding
10 Standard VHF COM/NAV/DME control panel
11 Frequency selector two-out-of-five binary code
12A Electromechanical DME indicator
12B Light bar type DME indicator
13 DME indicator pin connections
14 Suppression pulse system characteristics
15 Typical flush antennas
16 Typical blade antenna
17 Provisions for automatic test equipment
Appendices
1 Section 3.5, "Specification for UHF distance
        measuring equipment (DME)"
2 Military standard tactical air navigation
        (TACAN) signal
3 ANDB common system component characteristics for
        VORTAC
4 Airborne distance measuring equipment (air
        carrier aircraft)
5 Adapting ARINC 521D installations to accommodate
        ARINC 568 units
6 Chronology and bibliography of the AEEC mark 3
        DME project
7 Non-standard applications

Provides the desired characteristics of a new Distance Measuring Equipment intended for installation in commercial transport aircraft.