2BSUN-LR900-F915M data transmission

DHResearch,LLC. Address：440WyomingAvenueMillburn,NJ7041UnitedStates FRN:0037604691 Date:2026-01-30 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 Ref:AttestationStatementsPart2.911(d)(7)Filing SUBJECT:FCCApplicationforFCCID:2BSUN-LR900-F DHResearch,LLC.certifiesthat,asofthedateofthefilingoftheapplication,DHResearch, LLCisourdesignatedU.S.agentforserviceofprocessfortheabovereferencedFCCID.DH Research,LLC.acceptstomaintainanagentfornolessthanoneyearafterthegranteehas terminatedallmarketingandimportationortheconclusionofanyCommission-related proceedinginvolvingtheequipment. DHResearch,LLCaccepts,asofthedateofthefilingoftheapplication,theobligationofthe designatedU.S.agentforserviceofprocessfortheabovereferencedFCCID. DesignatedU.S.AgentInformation: Name:DHResearch,LLC. Address:440WyomingAvenueMillburn,NJ7041UnitedSt FRN:0037604691 ContactPerson:DengHuang Tel.:(614)596-4872 Email:[email protected] Sincerely, SignedonbehalfofDHResearch,LLC.SignedonbehalfofDHResearch,LLC. Name:Name: Title:ManagerTitle:Manager Date:2026-01-30Date:2026-01-30

Rev9/15/2025 DHResearch,LLC.. FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:Jan27,2026 Ref:AttestationStatementsPart2.911(d)(5)(i)Filing FCCID:2BSUN-LR900-F DHResearch,LLC.certifiesthattheequipmentforwhichauthorizationissoughtisnot“covered” equipmentprohibitedfromreceivinganequipmentauthorizationpursuanttosection2.903oftheFCC rules. DHResearch,LLC.certifiesthattheequipmentforwhichauthorizationissoughtdoesnotinclude cybersecurityoranti-virussoftwareproducedorprovidedbyKasperskyLab,Inc.oranyofitssuccessors andassignees,includingequipmentwithintegratedKasperskyLab,Inc.(oranyofitssuccessorsand assignees)cybersecurityoranti-virussoftwarepursuanttoDA-24-886andKDB986446D01Covered EquipmentGuidancesectionB(2a). █Deviceisinherentlycompliantbasedonhardwarelimitationsorsoftwarecontrols. or ASoftwareBillofMaterials(SBOM)isprovidedtotheTCBforreview,and Theend-userorthirdpartiescannotinstalladditionalsoftwareonthisdevice. Sincerely, DengHuang DHResearch,LLC.. Rev9/15/2025 FederalCommunicationsCommission AuthorizationandEvaluationDivision 7435OaklandMillsRoad Columbia,MD21046 USA Date:Jan27,2026 Ref:AttestationStatementsPart2.911(d)(5)(ii)Filing FCCID:2BSUN-LR900-F DHResearch,LLC.certifiesthat,asofthedateofthefilingoftheapplication,theapplicantisnot identifiedontheCoveredList(asaspecificallynamedentityoranyofitssubsidiariesoraffiliates)asan entityproducing“covered”equipment. Sincerely, DengHuang DHResearch,LLC..

TX915-JK-11B Antenna Specification Sheet 915MHz Bendable Rubber Rod Antenna Translated from Chinese (Simplified) to English - www.onlinedoctranslator.com Chengdu Yibaite Electronic Technology Co., Ltd.TX915-JK-11B Product Specification Sheet Chapter 1 Product Introduction The TX915-JK-11B is a bendable rubber rod antenna for the 915MHz band. The antenna is approximately 110mm in height and features an SMA-J connector (SMA internal thread pin). It is suitable for broadband communication systems, wireless hotspot coverage, and mobile terminal devices such as routers, access points (APs), radios, and network cards in the 915MHz band. Chapter Two Specifications Electrical parameters Center frequency915MHz Antenna bandwidth895-935MHz Antenna gain2.5dBi Voltage Standing Wave Ratio≤1.5 polarization directionVertical polarization Radiation directionOmnidirectional Input impedance50Ω Power capacity20W Other parameters Product Dimensions110mm Overall weight8g Antenna housing materialTPEE Interface methodSMA-J (SMA internal thread inner pin) Operating temperature- 30°C〜+75°C Storage temperature- 30°C〜+75°C Copyright ©2012‒2020Chengdu Yibaite Electronic Technology Co., Ltd. 1 No.1Page Chengdu Yibaite Electronic Technology Co., Ltd.TX915-JK-11B Product Specification Sheet Chapter 3 Antenna Characteristics Voltage Standing Wave Ratio (VSWR) Smith chart Copyright ©2012‒2020Chengdu Yibaite Electronic Technology Co., Ltd. 2 No.2Page Chengdu Yibaite Electronic Technology Co., Ltd.TX915-JK-11B Product Specification Sheet Chapter 4 Frequently Asked Questions - - - - - - - - The antenna frequency must match the frequency of the wireless device; otherwise, the communication effect will be poor. The lower the communication frequency and the longer the wavelength, the better the diffraction performance. When there are obstacles in line-of-sight communication, the communication distance will be reduced accordingly; Please note the antenna's radiation direction; incorrect antenna installation will result in a shorter transmission distance. The ground absorbs radio waves, so testing near the ground yields poor results; it is recommended to increase the altitude. Seawater has a very strong ability to absorb radio waves, so testing at the seaside is not effective. The presence of metal objects near the antenna or its placement within a metal casing will cause severe signal attenuation. Poor impedance matching between the antenna and the communication equipment will lead to poor communication performance. about Us Sales Hotline: 4000-330-990 Technical Support:[email protected] Official website:www.ebyte.com Company Address: Building B5, No. 199, West District Avenue, High-tech Zone, Chengdu, Sichuan Province Copyright ©2012‒2020Chengdu Yibaite Electronic Technology Co., Ltd. 3 No.3Page

DHResearch,LLC. Date：Jan27,2026 ProductModelNumber:LR900-F FCCID：2BSUN-LR900-F Towhomitmayconcern, Re:ProductCertificationRepresentativeAuthorizationLetter WeauthorizeQAILaboratoriesLtd.3980NorthFraserWay,BurnabyB.C. CanadaV5J5K5toactonourbehalfonallmattersconcerningtheabove namedequipment. Thisshallincludethefollowing: Testing Approvalapplicationsandprocedures WedeclarethatQAILaboratoriesLtd.isallowedtoforwardallinformation relatedtotheapprovalprojecttotheappliedcertificationbodyandtothe notificationentitiesandtodiscussanyissuesconcerningtheapproval application.AnyandallactscarriedoutbyQAILaboratoriesLtd.onour behalfshallhavethesameeffectasactsofourown. By: ContactListedonFCCWesbite Title:DengHuang Email:[email protected] Telephone:6145964872 Onbehalfof:DHResearch,LLC..

DHResearch,LLC. OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 USA Date:January28,2026 Subject;RequestforConfidentiality FCCID:2BSUN-LR900-F ToWhomItMayConcern, PursuanttotheprovisionsoftheCommission’srulesTitle47Sections§0.457and§0.459,we arerequestingtheCommissiontowithholdthefollowingattachment(s)asconfidential documentsfrompublicdisclosureindefinitely. Thesedocumentscontaindetailedsystemandequipmentdescriptionsandareconsideredas proprietaryinformationinoperationoftheequipment.Thepublicdisclosureofthese documentsmightbeharmfultoourcompanyandwouldgivecompetitorsanunfairadvantage inthemarket. █SchematicDiagram █BlockDiagram PartsList █OperationalDescription Tune-upProcedure SoftwareSecurityRequirementsforUNIIdevices Inadditionaltoabovementioneddocuments,inordertocomplywiththemarketingregulations inTitle47CFR§2.803andtheimportationrulesinTitle47CFR§2.1204,whileensuringthat businesssensitiveinformationremainsconfidentialuntiltheactualmarketingofnewly authorizeddevices,werequestShortTermConfidentialityofthefollowingattachment(s); █ExternalPhotos █TestSetupPhotos █InternalPhotos █UserManual █For45days,pursuanttoPublicNoticeDA04-1705. OR For180dayspursuanttoKDB726920D01. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondenceduringthecertificationreviewprocesscannotbegrantedasconfidential documentsandthisinformationwillbeavailableforpublicreviewoncethegrantofequipment authorizationisissued. Sincerely, Signature: Name:DengHuang Title:Manager

FCCID:2BSUN-LR900-F FCCLabelSample FCCLabelSpecifications TextisBlackincolorandisjustified.Labelsareprintedinindelibleinkonpermanent adhesivebackingorsilk-screenedontotheEUTorshallbeaffixedataconspicuouslocation ontheEUT.WheretheEUTisconstructedintwoormoresectionsconnectedbywiresand marketedtogether,theabovestatementisrequiredtobeaffixedonlytothemaincontrol unit.WhentheEUTissosmallorforsuchusethatitisnotpracticabletoplacethestatement onit,theaboveinformationshallbeplacedinaprominentlocationintheinstructionmanual orpamphletsuppliedtotheuseror,alternatively,shallbeplacedonthecontainerinwhich thedeviceismarketed. FCCLabelLocation Size:10mm*8mm FCCID:2BSUN-LR900-F LabelLocation

FCCID:2BSUN-LR900-F RFExposureEvaluation Limits Thecriterialistedinthefollowingtableshallbeusedtoevaluatetheenvironmentimpactofhuman exposuretoradiofrequency(RF)radiationasspecifiedin1.1307(b) LimitsforMaximumPermissibleExposure(MPE) Frequencyrange (MHz) Electricfield strength (V/m) Magneticfieldstrength (A/m) Powerdensity (mW/cm2) Averagingtime (minutes) (A)LimitsforOccupational/ControlledExposures 0.3–3.06141.63*(100)6 3.0–301842/f4.89/f*(900/f2)6 30–30061.40.1631.06 300–1500f/3006 1500–100,00056 (B)LimitsforGeneralPopulation/UncontrolledExposure 0.3–1.346141.63*(100)30 1.34–30824/f2.19/f*(180/f2)30 30–30027.50.0730.230 300–1500f/150030 1500–100,0001.030 f=frequencyinMHz Friistransmissionformula:Pd=(Pout*G)/(4*pi*r2) Where Pd=powerdensityinmW/cm2,Pout=outputpowertoantennainmW; G=gainofantennainlinearscale,Pi=3.1416; R=distancebetweenobservationpointandcenteroftheradiatorincm PdidthelimitofMPE,1mW/cm2.Ifweknowthemaximumgainoftheantennaandthetotalpower inputtotheantenna,throughthecalculation,wewillknowthedistancerwheretheMPElimitis reached. TestProcedure SoftwareprovidedbyclientenabledtheEUTtotransmitandreceivedataatlowest,middleand highestchannelindividually. TestResultofRFExposureEvaluation LoRa Mode Outputpower toantenna (dBm) Outputpower toantenna (mW) PowerDensityat R=20cm (mW/cm 2 ) Limit (mW/cm 2 ) Result LoRa25.449 350.67110.12406 0.610PASS Remark:915antennagain=2.5dBi=1.78mW LoRa：0.12406=<0.610limit SoaSARtestisnotrequired

-Page 1 of 36 -ReportNo.:HB20260107005E-01 Add:Room102,201,Building2,YuanwangguRFIDIndustrialPark,TongguanRoad,TianliaoCommunity,YutangStreet,GuangmingDistrict,Shenzhen,China Tel:(86-755)29989321Fax:(86-755)29985110Web:www.sz-hongbiao.com TestReport Product: 915Mdatatransmission TradeMark: N/A ModelNumber: LR900-F FCCID: 2BSUN-LR900-F Preparedfor DHResearch,LLC. 440WyomingAvenueMillburn,NJ7041UnitedState Preparedby ShenzhenHongBiaoCertification&TestingCo.,Ltd. Room102,201,Building2,YuanwangguRFIDIndustrialPark,Tongguan Road,TianliaoCommunity,YutangStreet,GuangmingDistrict,Shenzhen, China Tel.:+86-755-29989321Fax.:+86-755-29985110 Website:http://www.sz-hongbiao.com -Page 2 of 36 -ReportNo.:HB20260107005E-01 Add:Room102,201,Building2,YuanwangguRFIDIndustrialPark,TongguanRoad,TianliaoCommunity,YutangStreet,GuangmingDistrict,Shenzhen,China Tel:(86-755)29989321Fax:(86-755)29985110Web:www.sz-hongbiao.com TableofContents 1GENERALDESCRIPTION..............................................................................................................................................6 1.1DESCRIPTIONOFEUT.....................................................................................................................................................6 1.2TESTMODE...................................................................................................................................................................6 1.3OPERATIONCHANNELLIST...............................................................................................................................................7 1.4TESTSETUP...................................................................................................................................................................7 1.5POWERSETTINGCONFIGURATIONPARAMETERS...................................................................................................................7 1.6ANCILLARYEQUIPMENT...................................................................................................................................................7 2SUMMARYOFTESTRESULT........................................................................................................................................8 3TESTFACILITIESANDACCREDITATIONS.......................................................................................................................9 3.1TESTLABORATORY..........................................................................................................................................................9 3.2ENVIRONMENTALCONDITIONS..........................................................................................................................................9 3.3MEASUREMENTUNCERTAINTY..........................................................................................................................................9 3.4TESTSOFTWARE...........................................................................................................................................................10 4LISTOFTESTEQUIPMENT.........................................................................................................................................11 5TESTITEMANDRESULTS...........................................................................................................................................13 5.1ANTENNAREQUIREMENT...............................................................................................................................................13 5.1.1StandardRequirement.....................................................................................................................................13 5.1.2TestResult........................................................................................................................................................13 5.2CONDUCTEDEMISSION..................................................................................................................................................14 5.2.1Limits................................................................................................................................................................14 5.2.2TestProcedures................................................................................................................................................14 5.2.3TestSetup.........................................................................................................................................................15 5.2.4TestResult........................................................................................................................................................15 5.3RADIATEDEMISSION.....................................................................................................................................................18 5.3.1Limits................................................................................................................................................................18 5.3.2TestProcedures................................................................................................................................................18 5.3.3TestSetup.........................................................................................................................................................18 5.3.4TestResult........................................................................................................................................................19 5.3.5BandEdge-Radiated......................................................................................................................................23 5.3.6Spuriousemissioninrestrictedband1000MHz-25000MHz............................................................................24 5.4PEAKOUTPUTPOWER..............................................................................…

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