ETSI EN 300 328-1 V1.2.2 (2000-07)

ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Wideband Transmission systems; data transmission equipment operating in the 2,4 GHz ISM band and using spread spectrum modulation techniques; Part 1: Technical characteristics and test conditions

REN/ERM-TG11-001-1

Elektromagnetna združljivost in zadeve v zvezi z radijskim spektrom (ERM) – Širokopasovni prenosni sistemi – Oprema za prenos podatkov, ki deluje v frekvenčnem pasu 2,4 GHz ISM in uporablja modulacijsko tehniko z razpršenim spektrom – 1. del: Tehnične karakteristike in preskusni pogoji

General Information

• Status: Published
• Publication Date: 27-Jul-2000
• Technical Committee: ERM TG11 - Wideband Data Systems
• Current Stage: 12 - Completion
• Due Date: 04-Aug-2000
• Completion Date: 28-Jul-2000
• Ref Project: SIST EN 300 328-1 V1.2.2:2003 - ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Wideband Transmission systems; data transmission equipment operating in the 2,4 GHz ISM band and using spread spectrum modulation techniques; Part 1: Technical characteristics and test conditions

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.UD]SUãHQLPElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Wideband Transmission systems; data transmission equipment operating in the 2,4 GHz ISM band and using spread spectrum modulation techniques; Part 1: Technical characteristics and test conditions33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 300 328-1 Version 1.2.2SIST EN 300 328-1 V1.2.2:2003en01-december-2003SIST EN 300 328-1 V1.2.2:2003SLOVENSKI
STANDARD



SIST EN 300 328-1 V1.2.2:2003



ETSIEN300328-1V1.2.2(2000-07)EuropeanStandard(Telecommunicationsseries)Electromagneticcompatibilityand Radio spectrum Matters (ERM);WidebandTransmissionsystems;datatransmissionequipmentoperatinginthe2,4GHzISMbandandusingspreadspectrummodulationtechniques;Part1:TechnicalcharacteristicsandtestconditionsSIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)2ReferenceREN/ERM-TG11-001-1Keywordsdata,ISM,LAN,mobile,radio,spreadspectrum,testing,transmissionETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94General.94.1Manufacturerdeclarations.94.2Presentationofequipmentfortypetesting.104.2.1Choiceofmodel.104.2.2Presentation.104.2.3Choiceofoperatingfrequencies.104.3Design.114.3.1General.114.3.2Controls.114.4Interpretationofthemeasurementresults.115Technicalcharacteristics.115.1Modulation.115.1.1FHSSmodulation.115.1.2DSSSandotherformsofmodulation.115.2Transmitterparameterlimits.125.2.1Effectiveradiatedpower.125.2.2Peakpowerdensity.125.2.3Frequencyrange.125.2.4Spuriousemissions.125.3Receiverparameterlimits.135.3.1General.135.3.2Spuriousemissions.136Testconditions.146.1Normalandextremetestconditions.146.2Powersources.146.2.1Powersourcesforstand-aloneequipment.146.2.2Powersourcesforplug-inradiodevices.146.3Normaltestconditions.146.3.1Normaltemperatureandhumidity.146.3.2Normalpowersource.156.3.2.1Mainsvoltage.156.3.2.2Lead-acidbatterypowersourcesusedonvehicles.156.3.2.3Otherpowersources.156.4Extremetestconditions.156.4.1Extremetemperatures.156.4.2Extremepowersourcevoltages.156.4.2.1Mainsvoltage.156.4.2.2Lead-acidbatterypowersourcesusedonvehicles.166.4.2.3Powersourcesusingothertypesofbatteries.166.4.2.4Otherpowersources.166.4.3Procedurefortestsatextremetemperatures.166.5Testingofhostconnectedequipmentandplug-inradiodevices.166.5.1AlternativeA:combinedequipment.166.5.2AlternativeB:useofahostortestjig.17SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)46.6Testdatasequence.177Methodsofmeasurement.177.1General.177.2Measurementsoftransmitterparameters.187.2.1Effectiveradiatedpower.187.2.2Peakpowerdensity.197.2.3FrequencyrangeofequipmentusingFHSSmodulation.207.2.4Frequencyrangeofequipmentusingotherformsofmodulation.217.2.5Spuriousemissions.227.3Measurementsofreceiverparameters.237.3.1General.237.3.2Spuriousemissions.238Measurementuncertaintyvalues.24AnnexA(normative):Testsitesandarrangementsforradiatedmeasurements.25A.1Testsites.25A.1.1Openairtestsites.25A.1.2Anechoicchamber.26A.1.2.1General.26A.1.2.2Description.26A.1.2.3Influenceofparasiticreflections.26A.1.2.4Calibrationandmodeofuse.27A.2Testantenna.28A.3Substitutionantenna.29AnnexB(normative):Generaldescriptionofmeasurement.30B.1Conductedmeasurementsanduseoftestfixture.30B.2Radiatedmeasurements.30B.3Substitutionmeasurement.31Bibliography.33History.34SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeElectromagneticcompatibilityandRadiospectrumMatters(ERM).Thepresentdocumentispart1ofamulti-partENcoveringtheElectromagneticcompatibilityandRadioSpectrumMatters(ERM);WidebandTransmissionsystems;datatransmissionequipmentoperatinginthe2,4GHzISMbandandusingspreadspectrummodulationtechniques,asidentifiedbelow:Part1:"Technicalcharacteristicsandtestconditions";Part2:"HarmonizedENcoveringessentialrequirementsunderarticle3.2oftheR&TTEDirective".AnnexAprovidesadditionalrequirementsconcerningradiatedmeasurements.AnnexBcontainsnormativespecificationsfortheadjustmentofthemeasurementequipmentandoftheequipmenttobemeasuredinordertoachievecorrectresults.AnnexCprovidesaBibliography.NationaltranspositiondatesDateoflatestannouncementofthisEN(doa):31October2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30April2001DateofwithdrawalofanyconflictingNationalStandard(dow):30April2001IntroductionWidebandradiodatatransmissionsystemsarerapidlybeingintroducedintoavarietyofcommercialandindustrialapplicationsandthetechnologyemployedbythesesystemsisstilldeveloping.Thepresentdocumentmaybeusedbyaccreditedtestlaboratoriesfortheassessmentoftheperformanceoftheequipment.Theperformanceoftheequipmentsubmittedfortypetestingshouldberepresentativefortheperformanceofthecorrespondingproductionmodel.Inordertoavoidanyambiguityinthatassessment,thepresentdocumentcontainsinstructionsforthepresentationofequipmentfortypetestingpurposes(clause4),testingconditions(clause6)andmethodsofmeasurement(clause7).Thepresentdocumentassumesthat:-thetypetestmeasurementsperformedinanaccreditedtestlaboratoryinoneCEPTcountrywouldbeacceptedbytheTypeApprovalAuthorityinanothercountryprovidedthatthenationalregulatoryrequirementsaremet(seeCEPTRecommendationT/R71-03[3]);-ifequipmentavailableonthemarketisrequiredtobecheckeditwouldbetestedinaccordancewiththemethodsofmeasurementspecifiedinthepresentdocument.SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)61ScopeThepresentdocumentcoversequipmentreferredtoinCEPTRecommendationT/R10-01[1].Thepresentdocumentcoverstheminimumtechnicalcharacteristicsforradiodatatransmissionequipmenthavingthefollowingtechnicalparameters:-widebandradiomodulationtechniques;-aggregatebitratesinexcessof250kbits/s;-operationinthe2,4to2,4835GHzIndustrial,ScientificandMedical(ISM)band;-effectiveradiatedpowerofupto-10dBW(100mW);-powerdensityofupto-10dBW(100mW)per100kHzforfrequencyhoppingmodulation;-powerdensityofupto-20dBW(10mW)per1MHzforotherformsofspreadspectrummodulation.Thepresentdocumentonlyaddressesthetransceivers,transmittersandreceiversofequipmentofferedfortesting.Theequipmentofferedfortestingmaybeusedinfixed,mobileorportableapplications,e.g.:-stand-aloneradioequipmentwithorwithouttheirowncontrolprovisions;-plug-inradiodevicesintendedforusewithorwithinavarietyofhostsystems,e.g.personalcomputers,hand-heldterminals,etc.Theequipmentmaybefittedwithintegralantennaeand/orantennaconnectors.CEPTRecommendationT/R10-01[1]definesthetotalpowerandpowerdensitylimitsforsystemsusingspreadspectrummodulationtogetherwithaminimumaggregatebitrateof250kbits/s.TheRecommendationdoesnotaddressthedetailsofthesemodulationtechniques.Therefore,thepresentdocumentdoesnotcoverthedesignoroperationoftheequipmentbeingtestedbutdescribesacommonsetofmeasurementstobeappliedtovarioustypesofsuchequipment,includingthoseemployingFrequencyHoppingSpreadSpectrum(FHSS)modulationandDirectSequenceSpreadSpectrum(DSSS)modulation.CEPTRecommendationT/R10-01[1]specifiesthatspreadspectrummodulationbeusedanditgivespowerdensityvaluesforFHSSandDSSSmodulation.ThepresentdocumentspecifiestheminimumtechnicalparametersofFHSSmodulationsuchthatitcanbeclearlydifferentiatedfromothertypesofmodulation,includingDSSSmodulation.CEPTRecommendationT/R01-04[2]defineslimitsofspuriousemissionsforavarietyofradioequipment;theselimitsareusedinthepresentdocumentasappropriate.Thepresentdocumentdescribesmeasurementsforoperatingfrequencyrange(s),effectiveradiatedpowerandpowerdensityaswellasspuriousemissionsfortransmittersandreceivers.ThemeasurementmethodshavebeenadaptedfromETR027[4]wherepossible.Thepresentdocumentspecifiestestsitecharacteristics,testconditions,equipmentcalibrationandmethodsofmeasurement.Thepresentdocumentisageneralstandardwhichmaybesupersededbyspecificstandardscoveringspecificapplications.AdditionalstandardsorspecificationsmayberequiredforequipmentsuchasthatintendedforconnectiontothePublicSwitchedTelephoneNetwork(PSTN)and/orotherPublicDataNetworks(PDN).SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)72ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,Versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestVersionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterVersionspublishedasanENwiththesamenumber.[1]CEPTRecommendationT/R10-01:"WideBandDataTransmissionSystemsUsingSpread-SpectrumTechnologyinthe2,5GHzBand".[2]CEPTRecommendationT/R01-04:"UseofLowPowerDevices(LPD)UsingIntegralAntennasandOperatinginHarmonizedFrequencyBands".[3]CEPTRecommendationT/R71-03:"ProceduresforTypeTestingandApprovalforRadioEquipmentIntendedforNon-PublicSystems".[4]ETSIETR027:"RadioEquipmentandSystems(RES);Methodsofmeasurementforprivatemobileradioequipment".[5]ETSIETR028:"RadioEquipmentandSystems(RES);Uncertaintiesinthemeasurementofmobileradioequipmentcharacteristics".SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:aggregatebitrate:bitrateattheairinterface(seepointDinfigure1)includingprotocoloverheadwhereapplicableandexcludingtheeffectsofsignalspreading.ABCDDatabufferprocessingradiodevicedata1datanclock1clocknsignalspreadingTxamplifierspreadingsignaltransmitterA:InterfaceB:InputintoprocessinglogicC:InputintothemodulatorD:AirInterfaceFigure1:Parametersrelatedtotheaggregatebitratechip:unitofmodulationusedindirectsequencespreadspectrummodulation.chiprate:numberofchipspersecond.chipsequence:sequenceofchipswithdefinedlengthanddefinedchippolarities.directsequencespreadspectrummodulation:formofmodulationwhereacombinationofdatatobetransmittedandaknowncodesequence(chipsequence)isusedtodirectlymodulateacarrier,e.g.byphaseshiftkeying.Thetransmittedbandwidthisdeterminedbythechiprateandthemodulationscheme.fixedstation:equipmentintendedforuseinafixedlocationandfittedwithoneormoreantennae.Theequipmentmaybefittedwitheitherantennasocket(s)orintegralantenna(e)orboth.frequencyhoppingspreadspectrummodulation:spreadspectrumtechniqueinwhichthetransmittersignaloccupiesanumberoffrequenciesintime,eachforsomeperiodoftime,referredtoasthedwelltime.Transmitterandreceiverfollowthesamefrequencyhoppattern.Thefrequencyrangeisdeterminedbythelowestandhighesthoppositionsandthebandwidthperhopposition(seesubclause5.2.3).frequencyrange:rangeofoperatingfrequenciesoverwhichtheequipmentcanbeadjusted.hand-portablestation:equipmentnormallyusedonastand-alonebasisandtobecarriedbyapersonorheldinthehand.Theequipmentmaybefittedwithoneormoreantennae.Theequipmentmaybefittedwitheitherantennasocket(s)orintegralantenna(e)orboth.SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)9host:hostequipmentisanyequipmentwhichhascompleteuserfunctionalitywhennotconnectedtotheradioequipmentpartandtowhichtheradioequipmentpartprovidesadditionalfunctionalityandtowhichconnectionisnecessaryfortheradioequipmentparttoofferfunctionality.integralantenna:antennadesignedtobeconnectedtotheequipmentwithouttheuseofastandardconnectorandconsideredtobepartoftheequipment.Anintegralantennamaybefittedinternallyorexternallytotheequipment.manufacturer:forthepurposesofthepresentdocument"manufacturer"isunderstoodtorefertothemanufacturerorapplicantofequipmentofferedfortesting.mobilestation:equipmentnormallyusedinavehicleorasatransportablestation.Theequipmentmaybefittedwithoneormoreantennae.Theequipmentmaybefittedwitheitherantennasocket(s)orintegralantenna(e)orboth.operatingfrequency:nominalfrequencyatwhichtheequipmentcanbeoperated;thisisalsoreferredtoastheoperatingcentrefrequency.Equipmentmaybeadjustableforoperationatmorethanoneoperatingfrequency.plug-inradiodevice:equipmentintendedtobeusedwithorwithinvarietyofhostsystems,usingtheircontrolfunctionsandpowersupply.powerenvelope:frequency/powercontourwithinwhichtheusefulRFpowerisgenerated.spreadspectrummodulation:modulationtechniqueinwhichtheenergyofatransmittedsignalisspreadthroughoutarelativelylargeportionofthefrequencyspectrum.stand-aloneradioequipment:equipmentthatisintendedprimarilyascommunicationsequipmentandthatisnormallyusedonastand-alonebasis.3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:dBmdBrelativeto1milliwattpowerdBWdBrelativeto1wattpowerDSSSDirectSequenceSpreadSpectrume.i.r.p.equivalentisotropicallyradiatedpowerFHSSFrequencyHoppingSpreadSpectrumISMIndustrial,ScientificandMedicalRFRadioFrequencyTxTransmitter4General4.1ManufacturerdeclarationsThemanufacturershalldeclarethefollowingspecificcharacteristicsoftheequipment:a)theaggregatebitrate(seesubclause3.1forthedefinition);b)thetypeofmodulationused:FHSSmodulation,DSSSmodulationoranyothertypeofspreadspectrummodulation(seesubclause5.1);c)whereFHSSmodulationisused:thenumberofhoppingchannels,thedwelltimeperchannelandthemaximumtimebetweentwoinstancesofuseofthesamechannel;thesevaluesshallfallwithinthespecificationsgiveninsubclause5.1.1;d)theoperatingfrequencyrange(s)oftheequipmentand,whereapplicable,band(s)ofoperation(seesubclause5.2.3);SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)10e)thetypeoftheequipment,forexample:stand-aloneequipmentorplug-inradiodevices(seealsosubclause3.1).Incaseofcombinedequipmentusingaplug-inradiodevice,andmorethanonecombinationisintended,eachcombinationshouldbedeclaredaswell(seealsosubclause6.5.1);f)theextremeoperatingconditionsthatapplytotheequipmentofferedfortesting;g)wheretheradioequipmentiscapableofdifferenttransmitterpowersettings,themanufacturershalldeclaretheintendedcombination(s)oftheradioequipmentpowersettingsandoneormoreantennaassemblies.Foreachcombination,thegainoftheantennaassemblyi.e.thetransferfunctionbetweentheconductedRFpowerande.i.r.p.,shallbedeclared;h)thenominalvoltagesofthestand-aloneradioequipmentorthenominalvoltagesofthehostequipmentincaseofplug-indevices.Wherethemanufactureroffersdifferentcombinationsofequipmentandantennae,theantennaeappropriateforagivencombinationshallbereferencedeitherontheequipmentandontheantennaeand/orintheuserdocumentation.4.2Presentationofequipmentfortypetesting4.2.1ChoiceofmodelThemanufacturershallofferoneormoreproductionmodelsorequivalentpreliminarymodels,asappropriate,fortypetesting.Iftypeapprovalisgivenonthebasisoftestson(a)preliminarymodel(s),thenthecorrespondingproductionmodelsshallbeidenticaltothetestedmodelsinallrespectsrelevantforthepurposesofthepresentdocument,tothepreliminarymodel(s)tested.Softwarefittedtoproductionmodelsshallbesubstantiallythesameasthatusedduringtypetesting.DuetothelowlevelsofRFsignalandthewidebandmodulationsusedinthistypeofequipment,radiatedRFpowermeasurementsareimprecise.Conductedmeasurementsaremuchmoreprecise;incombinationwiththedeclaredantennaassemblygain(s)adequateassuranceoftheRFcharacteristicscanbeachieved.Therefore,equipmentofferedfortestingshallpreferablyprovideasuitableconnectorforconductedRFpowermeasurements.Wherethisisnotpossible,themanufacturershallprovideadocumentedtestfixturethatconvertstheradiatedsignalintoaconductedsignalintoasuitabletermination.Alternatively,radiatedmeasurementsshallbeperformed.4.2.2PresentationStand-aloneequipmentshallbeofferedcompletewithanyancillaryequipmentneededfortesting.Themanufacturershalldeclare,therangeofoperatingconditionsandpowerrequirementsasapplicableinordertoestablishtheappropriatetestconditions.Plug-inradiodevicesmaybeofferedfortestingtogetherwithasuitabletestjigand/orhostequipmentintendedfornormaluse(seesubclause6.5).Themanufacturershalldeclaretherangeofoperatingconditionsandpowerrequirementsthatareapplicableinordertoestablishtheappropriatetestconditions.Whereamanufacturerdeclaresmultiplecombinationsofradioequipmentandantennae,theconfigurationtobeusedfortestingshallbechosenasfollowsexceptwherespecifiedotherwise:-foreachcombination,determinethehighestuserselectablepowerlevelandtheantennaassemblywiththehighestgain;-fromtheresultingcombinations,choosetheonewiththehigheste.i.r.p.4.2.3ChoiceofoperatingfrequenciesWhereequipmentcanbeadjustedtooroperatedatdifferentoperatingfrequencies,aminimumoftwooperatingfrequenciesshallbechosensuchthatthelowerandhigherlimitsoftheoperatingrange(s)oftheequipmentarecovered(seesubclause5.2.3).SIST EN 300 328-1 V1.2.2:2003



ETSIETSIEN300328-1V1.2.2(2000-07)114.3Design4.3.1GeneralTheequipmentsubmittedbythemanufacturer,shallbedesigned,constructedandmanufacturedinaccordancewithgoodengineeringpractice,andwiththeaimofminimizingharmfulinterferencetootherequipmentandservices.4.3.2ControlsThosecontrols(oftheradiopart)which,ifmaladjusted,mightincreasetheinterferingpotentialoftheequipmentshallnotbeeasilyaccessibletotheuser.4.4InterpretationofthemeasurementresultsTheinterpretationofthetestresultsrecordedinatestreportforthemeasurementsdescribedinthepresentdocumentshallbeasfollows:a)themeasuredvaluerelatedtothecorrespondinglimitshallbeusedtodecidewhetheranequipmentmeetstherequirementsoftheEN;b)theactualmeasurementuncertaintyofthetestlaboratorycarryingoutthemeasurements,foreachparticularmeasurement,inaccordancewithETR028[5],shallberecordedinthetestreport.Therecordedvalueofthemeasurementuncertaintyshallbe,foreachmeasurement,equaltoorlowerthanthefiguresinclause8(tableofmeasurementuncertainty).5Technicalcharacteristics5.1ModulationThemanufacturershalldeclarethemodulationcharacteristicsoftheequipmenttobetested.Forthepurposeofdecidingwhichlevelofpowerdensityappliestoequipmentofferedfortesting,thepresentdocumentdefinestwocategoriesofequipment:equipmentconformingtothestatedcharacteristicsofFHSSmodulation(seesubclause5.1.1)andequipmentnotconformingtothesecharacteristics.ThelattercategoryincludesequipmentusingDSSSmodulation(seesubclause5.1.2).5.1.1FHSSmodulationFHSSmodulationshallmakeuseofatleast20welldefined,non-overlappingchannelsorhoppingpositionsseparatedbythechannelbandwidthasmeasuredat20dBbelowpeakpower
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