Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1PurposeofThisCharacteristic
1.2ATCRBSSystemDescription
1.3ModeSSystemDescription
1.4ATCRBS/ModeSCompatibility
1.5TransponderFunctions
1.6UnitDescription
1.6.1TransponderUnit
1.6.2TransponderControl
1.6.3Antenna
1.6.4AltitudeReportingData
1.6.5ModeSDataLink
1.7Interchangeability
1.7.1General
1.7.2InterchangeabilityDesiredForTheARINC718
TransponderSystem
1.7.3"GenerationInterchangeability"Considerations
1.8RegulatoryApproval
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactor,ConnectorsandIndexPinCoding
2.2.1TransponderUnit
2.2.2"StandardControlPanel"
2.2.3Antenna
2.3Interwiring
2.4Powercircuitry
2.4.1PrimaryPowerInput
2.4.2PowerControlCircuitry
2.4.3TheCommonGround
2.4.4TheACCommonCold
2.5StandardSMandELMInterface
2.6EnvironmentalConditions
2.7Cooling
2.8GroundingandBonding
3.0SYSTEMCHARACTERISTICS
3.1PurposeofThisChapter
3.2ATCRBS/ModeSCompatibility
3.3InterrogationSignalCharacteristics
3.3.1ATCRBSInterrogations
3.3.2ModeSSensorInterrogation
3.4ReplyTransmissionCharacteristics(Signals-in-
Space)
3.4.1ATCRBSReplyTransmissions
3.4.2ModeSReplyTransmissions
3.4.3ReplyCarrierFrequency
3.5ATCSystemUseofModeS
3.6SourcesofReplyCodeData
4.0TRANSPONDERUNITDESCRIPTION
4.1FunctionalCapability
4.1.1General
4.1.2TransponderFunctions
4.1.3TransponderControl
4.2TransponderReceiverCharacteristics
4.2.1ReceiverCenterFrequencyandBandwidth
4.2.2ImageResponse
4.2.3OtherSpuriousResponses
4.2.4IFPickupRejection
4.2.5RFRejection
4.2.6CWDiscrimination
4.2.7InterrogationModes
4.2.8ReceiverSensitivityanMinimumTriggeringLevels
(MTL)
4.2.9DecodingofInterrogations
4.2.10SidelobeSuppression
4.2.11PulseDecoderTolerances
4.2.12ReceiverDensensitizationRecoveryTimes
4.2.13TransponderDeadTime
4.2.14MutualSuppressionPulses
4.2.15PulseDurationDiscrimination
4.2.16RandomTriggeringRate
4.2.17ModeSTransponderLockoutControl
4.3TransponderTransmitterCharacteristics
4.3.1ReplyTransmissionFrequency
4.3.2TransmitterPowerOutput
4.3.3TransponderEmissionSpectrum
4.3.4ReplyDelayandJitter
4.3.5ATCRBSReplyRateCapabilityandReplyRateLimit
Control
4.3.6TransmitterDutyCycle
4.3.7ATCRBSModeAReplyCodes
4.3.8ATCRBSModeCPressureAltitudeTransmission
4.3.9ModeSReplies
4.3.10ReplyPulseIntervalTolerance
4.4TransponderFunctionalTestandMonitoring
4.4.1FunctionalTest
4.4.2Monitoring
4.5AntennaDiversityOperation
4.5.1AntennaSelection
4.5.2ReceivedSignalDelayTolerance
4.5.3DifferentialReplyDelay
4.5.4AntennaSelectionforSquitterTransmissions
4.5.5RFPortTransmitterIsolation
4.6ModeS/DataLinkProcessorInterfaceBus
4.6.1BasicDataExchangeProtocols
4.6.2DataExchangeProtocolsforUplinkMessage
4.6.3DataExchangeforDownlinkMessages
4.7ExtendedLengthMessage(ELM)Transfer
4.7.1Comm-C/Comm-DELMProtocol
4.7.2ELMDataTransferInterfaceStandards
4.7.3ELMUplinkTransactions
5.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
5.1General
5.2UnitIdentification
5.2.1PinAllocation
5.2.2UseofATLASLanguage
6.0CONTROLPANELDESIGN
6.1FormFactorandConnector
6.2ControlInformationTransfer
6.3ControlFunctions
6.3.1Standby/OnSwitching
6.3.2CodeSelectors
6.3.3"Ident"Pulse(SPI)On/Off
6.3.4AltitudeReportingOn/Off
6.3.5AltitudeDataSourceSelect
6.3.6SelfTestOn/Off
6.3.7TCASSensitivityControl
6.3.8TCASDisplayControl
6.3.9GillhamAltitudeSourceComparisonEnable/Inhibit
6.4Deleted
6.5Deleted
6.6Deleted
6.7ControlPanelPowerandInitialization
6.8DualTransponderControlPanelConsiderations
7.0ANTENNA
7.1ImpedanceandVSWR
7.2GainandPolarization
7.3PowerRating
7.4RadiationPattern
7.5Connector
7.6L-bandSystemsPhysicalIsolation
7.7AntennaInstallation
7.7.1TotalInterconnectionLosses
8.0BUILT-INTESTEQUIPMENT(BITE)
8.1Built-InTestEquipment(BITE)Function
8.2BITEDisplay
8.3FaultMonitor
8.4Self-TestInitiation
8.5MonitorMemoryOutput
ATTACHMENTS
1ATransponderUnitConnectorPositioning
1BControlUnitConnectorPositioning
1CTopAntenna
BottomAntenna
ConnectorLayout-ModeSTransponder
2AModeSTransponderStandardInterwiring
2BNotesApplicableToTheStandardInterwiring
2CTransponder/ControlPanelWiring
2DTransponder/DataLinkProcessorCommunications
Protocol
2EARINC429LowSpeedDataBusDefinition
2FAltitudeSourceSelectionSwitching
3AATCRBSReplyCodeAndPulseCharacteristics
3BModeAReplyCodeCombinations
3CInterrogationPulses
3DDPSKInterrogations
3EModeSReplies
3FModeAOnlyandModeCOnlyAll-Call
4ADITSDisplayControlWordforTCAS
4BDITSControlWordforTCASandModeSTransponder
4CDITSControlWordforModeSTransponder
4DDITSControlWordforTCASandModeSTransponder
4EDITSControlWordforTCASandModeSTransponder
4FDITSControlWordforTCASandModeSTransponder
4GDITSControlWordforTCASandModeSTransponder
4HStandardARINC429FormatforBusWWord5-
TranspondertoTCAS
4IStandardARINC429FormatforBus1Word6-
TranspondertoTCAS
5AModeSInterrogationFormats
5BModeSReplyFormats
5CCodingFunctionalDiagrams
5DFieldIndexReferenceNotes
6IndependentStandardMessage(SM)Protocols
7SuppressionPulseSystemCharacteristic
8TypicalBladeAntenna
9DiversityAntennaSelection
10EnvironmentTestCategories
11AEECLetters78-166/XPDR-12and78-175/XPDR-22
12ELMWordFormats
APPENDICES
Deleted Abstract
Defines an Air Traffic Control Radar Beacon System/Mode Select (ATCRBS) airborne transponder. The ATCRBS is made up of airborne transponders and ground interrogator-receivers, processing equipment and antenna systems. Mode S is a cooperative surveillance and communication system for air traffic control.
