Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1PurposeofthisDocument
1.2FunctionsandModesofOperation
1.3UnitDescription
1.3.1InterrogatorUnit
1.3.2Frequency/FunctionControl
1.3.3Indicator
1.3.4Antenna
1.4Interchangeability
1.4.1General
1.4.2InterchangeabilityDesiredfortheARINC709DME
System
1.4.3"GenerationInterchangeability"Considerations
1.5RegulatoryApproval
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactors,ConnectorsIndexPinCoding
2.2.1Interrogator
2.2.2"StandardControlPanel"
2.2.3Indicator
2.2.4Antenna
2.3Interwiring
2.4PowerCircuitry
2.4.1PrimaryPowerInput
2.4.2PowerControlCircuit
2.4.3115ACOutput
2.4.4TheACCommonCold
2.4.5TheCommonGround
2.5StandardOutputs
2.6EnvironmentalConditions
2.7Cooling
2.8GroundingandBonding
3.0SYSTEMDESIGN
3.1SystemApplication
3.2ImpactofAll-WeatherLandingProgram
3.3ChannelCapacity
3.4ChannelSelection
3.5Range
3.6SearchSpeed
3.7Outputs
3.7.1Pilot'sIndicator
3.7.2AuralOutput
3.8Accuracy
3.9FailureWarning
3.10DualInstallations
3.11FunctionalTest
3.12IntegrityMonitoring
3.13FrequencyScanningMode
4.0INTERROGATORUNITDESIGN
4.1ChannelCapacityandSelection
4.1.1ChannelCapacity
4.1.2ChannelSelectionSystem
4.1.2.1MLSFrequencyPairings
4.2DecoderPerformanceCharacteristics
4.3Range
4.4TrackingSpeed
4.5AcquisitionTime
4.6ProvisionsforILS-DMEFacilities
4.7Memory
4.7.1Memory-Distance
4.7.1.1AccuracyDuringMemory-Distance
4.7.2Memory-FreeScanningForegroundStack
4.8DataOutputs
4.8.1SerialDigitalDataOutputs
4.8.1.1BCDData
4.8.1.2BNRData
4.8.2AuralOutput
4.8.3GroundStationIdentReporting
4.9Accuracy
4.10FailureWarningAnnunciation
4.11RFPowerOutput
4.11.1StandbyOperation
4.12InterrogationRate
4.12.1InterrogationRateControl-FrequencyScanMode
4.13InterrogatorPulseSpectrumandCharacteristics
4.13.1FrequencySpectrum
4.13.2TransmitterPulseInterrogationCoding
4.13.3TransmitterPulseRiseTime
4.13.4CWOutput
4.14TransmitterFrequencyStability
4.15ReceiverSensitivity
4.16Co-ChannelPerformance
4.17AdjacentChannelPerformance
4.17.1On-ChannelSignalPresent
4.17.2NoOn-ChannelSignalPresent
4.18InterferenceRejection
4.18.1EquipmentDamage
4.18.2PerformanceDegradation
4.19TACANAzimuthProvisions
4.20SuppressionPulses
4.21EchoSusceptibility
4.22FunctionalTest
4.23Monitoring
4.23.1IndicatorStatusMonitoring
4.24FrequencyScanningMode
4.24.1Definitions
4.24.2InitialScan
4.24.2.1FrequencyScan-Foreground
4.24.2.2FrequencyScan-Background
4.24.2.3PowerInterruptions
5.0INDICATORDESIGNGUIDANCE
5.1StandardDistanceIndicator
5.1.1115VACPowerInput
5.1.2IndicatorRange
5.1.3IndicatorAccuracy
5.1.4DisplayinAbsenceofComputedData
5.1.5DisplayinEventofEquipmentMalfunction
5.1.6InputIsolation
5.1.7IndicatorStatusOutput
5.2AlternativeDMEIndicators
5.3IntegralLighting
6.0ANTENNA
6.1AntennaPerformanceCharacteristics
6.1.1ImpedanceandVSWR
6.1.2GainandPolarization
6.1.3PowerRating
6.2InstalledAntennaandTransmissionLineSystem
6.2.1RadiationPattern
6.2.2ImpedanceandVSWR
6.2.3AntennaIsolation
6.3TypicalAntennaPhysicalConfigurations
6.3.1TypicalFlushAntenna
6.3.2TypicalBladeAntenna
6.4PerformanceCharacteristicsofCommonL-Band
Antenna-DME/ATCRBS/DABS/ASAS
6.4.1ImpedanceandVSWR
6.4.2GainandPolarization
6.4.3PowerRating
6.4.4RadiationPattern
7.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
7.1General
7.2UnitIdentification
7.2.1PinAllocation
7.2.2UseofATLASLanguage
8.0BUILT-INTESTEQUIPMENT
8.1Built-InTestEquipment(BITE)
8.2Display
8.3FaultMonitor
8.4Self-TestInitiation
8.5MonitorMemoryOutput
ATTACHMENTS
1DMEInterrogatorUnitConnectorPositioning
2StandardInterwiring
NotesApplicabletotheStandardInterwiring
DMEInterrogatorConnector(MiddleInsert)
DMEInterrogatorConnectorLayout(BottomInsert)
3EnvironmentalTestCategories
4AElectromechanicalDMEIndicator
4BLightBarTypeDMEIndicator
5DMEInterrogatorPinConnections
6SuppressionPulseSystemCharacteristics
7TypicalFlushAntennas
8ATypicalBladeAntenna
8BTypicalBladeAntenna
9DigitalDataStandards
10SelectionofTACANChannelsnotPairedwithVHF
NAVFrequencies
APPENDICES
1StandardControlPanel
2ExcerptsfromICAOAnnex10"International
StandardsandRecommendedPracticesAeronautical
Telecommunications"RelevanttoDME
3MilitaryStandardTacticalAir
Navigation(TACAN)Signal
4U.S.NationalAviationStandardfortheVORTAC
System
5ChronologyandBibliography Abstract
Covers the desired characteristics of a new Distance Measuring Equipment intended for installation in commercial transport aircraft. It provides slant range distance from an aircraft to a selected DME ground facility, which is presented to the flight crew on an indicator located in the instrument panel. Other applications include utilization of frequency scanning modes by navigation computers.
