Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1Purposeofthisdocument
1.2Functionofequipment
1.3Unitdescription
1.3.1VHFtransceiverunit
1.3.2Frequencycontrol
1.3.3Antenna
1.4Interchangeability
1.4.1General
1.4.2InterchangeabilitydesiredfortheARINC716
VHFtransceiver
1.4.3"GenerationInterchangeability"considerations
1.5Regulatoryapproval
1.6Systemparameters
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2Formfactors,connectorsindexpincoding
2.2.1Transceiverunit
2.2.2"Standardcontrolpanel"
2.2.3Antennas
2.3Interwiring
2.4Powercircuitry
2.4.1Primarypowerinput
2.4.2Powercontrolcircuitry
2.4.3Thecommonground
2.4.4Internalcircuitprotection
2.5Environmentalconditions
2.6Cooling
2.7Groundingandbonding
3.0TRANSCEIVERUNITDESIGN
3.1Frequencyrangeandchannelling
3.2Frequencyselection
3.3ResidualFMspecification
3.4Transmitterfrequencyoffset
3.5Transmittoreceiverecovery
3.6Receiverdesign
3.6.1Sensitivity
3.6.2Selectivity
3.6.3Undesiredresponses
3.6.4Crossmodulation
3.6.5Audiooutput
3.6.5.1Audiosourceimpedance
3.6.5.2Outputregulation
3.6.5.3Gain
3.6.5.4Humlevel
3.6.5.5Voicephaseshiftlimit
3.6.5.6Distortion
3.6.5.7Voicephaseshiftlimit
3.6.6Automaticgaincontrol
3.6.7Desensitizationandinterferencerejection
3.6.7.1AGCversuspulseinterference
3.6.7.2Squelchversuspulseinterference
3.6.7.3Pulsenoiseoutput
3.6.7.4ReceiveroperationinthepresenceofInband
transmission
3.6.7.5Out-of-bandFMbroadcastintermodulation
interference
3.6.7.6Out-of-bandFMbroadcastdesensitization
interference
3.6.8Squelchprovisions
3.6.9SELCAL/dataoutput
3.6.9.1Gain
3.6.9.2Frequencyresponse
3.6.9.3Distortion
3.6.9.4Phaseshift
3.6.9.4.1SELCAL/dataphaseshift
3.6.9.4.2Differentialphasedelay
3.6.9.5AGCattacktime
3.6.9.6AGCdelaytime
3.7Transmitterdesign
3.7.1Poweroutput
3.7.2Frequencystability
3.7.3Sidetone
3.7.4Transmitterspuriousradiation
3.7.5Microphoneinput
3.7.5.1Modulationlevel
3.7.5.2Speechprocessing
3.7.5.3Frequencyresponse
3.7.5.4Distortion
3.7.6Leakage
3.7.7Keyline
3.7.8Datainput
3.7.8.1Modulationlevel
3.7.8.2Levelcontrol
3.7.8.3Frequencyresponse
3.7.8.4Distortion
3.7.8.5Phaseshift
3.7.8.6Differentialdelay
3.7.9Muting
3.7.10Receivetotransmitturnaround
4.0TRANSCEIVERUNITDESIGNFORTHE8.33kHz
CHANNEL-SPACEDMODEOFOPERATION
4.1Frequencyrangeandchannelling
4.2Frequencyselection
4.2.1Controlpanelprogramming
4.3Receiverdesign
4.3.1Selectivity
4.3.2Crossmodulation
4.3.3Squelchprovision
4.3.4SELCAL/dataoutput
4.3.4.1Gain
4.3.4.2Frequencyresponse
4.3.4.3Distortion
4.3.4.4Phaseshift
4.3.4.4.1SELCALphaseshift
4.3.4.4.2Differentialphasedelay
4.3.4.5AGCattacktime
4.3.4.6AGCdecaytime
4.4Transmitterdesign
4.4.1Frequencystability
4.4.2Microphoneinput
4.4.2.1Modulationlevel
4.4.2.2Speechprocessing
4.4.2.3Frequencyresponse
4.4.2.4Distortion
4.4.2.5Transmitteroccupiedspectrum
4.4.3DataInput
5.0ANTENNAS
5.1General
5.2Antennaconsiderationformultiplesystems
Operations
6.0AUTOMATICTESTEQUIPMENTPROVISIONS
6.1General
6.2Unitidentification
6.3Pinallocation
6.4UseofATLASlanguage
7.0BUILT-IN-TESTEQUIPMENT(BITE)
7.1Built-intestequipment(BITE)
7.2BITEdisplay
7.3Faultmonitor
7.4Self-testinitiation
7.5Monitormemoryoutput
ATTACHMENTS
1Transceiverunitconnectorpositioning
2Standardinterwiring
Notesapplicabletothestandardinterwiring
3Receiverselectivity
4Environmentaltestcategories
5TypicalVHFcommunicationsantenna
6Standard"Four-Wire"microphoneinterface
7Controlpanelguidelines
Standardcontrolpaneloutlinedrawing
8Assumedtestproceduresfordesensitizationand
Interferencerejection
9Typicaltestprocedures:Audiooutput
10Receiverselectivity
11Transmitterspectrummask
Appendices
1Frequency-channelpairingplan Abstract
Covers the desired characteristics of a new generation VHF Communications Transceiver System meant for installation in all forms of commercial transport aircraft. The VHF transceiver can support 8.33 kHz AM or 25 kHz Am voice or ACARS (2400 bps) data communications.
