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NCE P2KSR Mobile Decoder installed in Bachmann GP9 CN4497 Page 1 of 13 Installation of NCE P2KSR Mobile Decoder into Bachmann GP9 CN4497: Installation date: June 9 2018 This small GP9 diesel locomotive by Bachmann does not contain the highest quality motor nor top of the line gear sets, but it does have ample room for a mobile decoder. Given that there is only limited room for an additional speaker and current maintaining capacitors, and given the less than optimum quality of the motor and gear set the situation lent itself to a cheaper decoder installation.. that being a simple mobile decoder which can cost as low as $30. It just so happened that I had on hand a left over NCE P2KSR mobile decoder that is specifically intended by design to be installed into a Lifelike or Walters Proto2000 EMD GP38-2 diesel locomotive. I did install one of these into a P2K GP38-2 (see article on my web site titled....), but instead decided to put a Soundtraxx TSU1100 Sound decoder into the second GP38-2 I owned. (See article ...on my web site). This is why I had this specific decoder available and decided to use it in the standard issue Bachmann GP9. The NCE P2KSR Decoder has excellent motor tuning abilities and would considerably enhance the drive characteristics of my old GP9. However, there are some adaptations that have to be made. The NCE P2KSR Decoder is designed to directly plug into the 8 pin female plug as supplied in the P2K GP38-2. My installation of a TSU-1100 Sound Decoder into the P2K GP38-2 did not require the 8 pin plug which I salvaged for this project.

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InstallationofNCEP2KSRMobileDecoderintoBachmannGP9CN4497:Installationdate:June92018ThissmallGP9diesellocomotivebyBachmanndoesnotcontainthehighestqualitymotornortopofthelinegearsets,butitdoeshaveampleroomforamobiledecoder.Giventhatthereisonlylimitedroomforanadditionalspeakerandcurrentmaintainingcapacitors,andgiventhelessthanoptimumqualityofthemotorandgearsetthesituationlentitselftoacheaperdecoderinstallation..thatbeingasimplemobiledecoderwhichcancostaslowas$30.ItjustsohappenedthatIhadonhandaleftoverNCEP2KSRmobiledecoderthatisspecificallyintendedbydesigntobeinstalledintoaLifelikeorWaltersProto2000EMDGP38-2diesellocomotive.IdidinstalloneoftheseintoaP2KGP38-2(seearticleonmywebsitetitled....),butinsteaddecidedtoputaSoundtraxxTSU1100SounddecoderintothesecondGP38-2Iowned.(Seearticle...onmywebsite).ThisiswhyIhadthisspecificdecoderavailableanddecidedtouseitinthestandardissueBachmannGP9.TheNCEP2KSRDecoderhasexcellentmotortuningabilitiesandwouldconsiderablyenhancethedrivecharacteristicsofmyoldGP9.However,therearesomeadaptationsthathavetobemade.TheNCEP2KSRDecoderisdesignedtodirectlyplugintothe8pinfemaleplugassuppliedintheP2KGP38-2.MyinstallationofaTSU-1100SoundDecoderintotheP2KGP38-2didnotrequirethe8pinplugwhichIsalvagedforthisproject.

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Removingtheshell:Removingtheshellisasimplematterofreleasingthetabsoneoneachsidelocatedbottommiddleofthegastank.ThewiresintheoriginalGP9locomotivearenotcolour-codedaccordingtoNMRAconventionsandyouwillnoticethatrightsidetrackpickupsatfrontandrearhaveblueandblackwiresarisingfromoppositesides.Thewirestothefrontheadlightareblackandred,bearingnorelationtoproperDCCconventionforwirecolourcoding.Thereforedisregardthecoloursofthewiresandensurethatrightsidetrackpickupwiresconnecttotheproperpinlocationonthe8pinconnecterandsoon.

Afterremovingshell

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AfterremovingthetopweightIreplacedthefrontincandescentheadlightwithaSunny-white3mmLEDandaddedarearheadlight,whichtheoriginaldidnothave,withanotherSunny-whiteLED.CreatefrontandrearLEDlightcircuitswithwhitewireand1.5KOhmresistorconnectedtothecathodeoftheLED,andsimilarlyayellowwireand1.5KOhmresistorconnectedtocathodeofrearLED.Heatshrinktubingcanbeusedtoinsulatethebarewiresfromthemetaloftheleadweightsafterassembly.

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FrontandrearHeadlightcircuitsinstalledinshell

Preparingthemotor:Besurethemotoriscompletelyisolatedfromthemetalchassis.IusedKaptontapeforthispurpose.(SeephotoofmotoranduseofKaptontapeonchassistoisolatethemotor...Page5)Thepolarityofthemotorterminalsisnotclearlymarkedsobesureyouobservewhicharethepositiveandnegativeterminalsbyexaminingwhichterminalconnectedtotherightandlefttracksontheoriginalconnections.(NMRAconventiondefinestherighttrackwheninforwardmotionisthepositivetrack).ThewaythemotorwasinsertedinthislocomotiveIfoundthepositiveterminaltobeatthebottomandthenegativeterminalatthetop.Solderanorangewiretothepositivemotorterminalandagreywiretothenegativemotorterminal.ThesewillconnecttopinsP1andP5onthe8pinplug.Seethe8PinPlugconnectiondiagramandtheschematicwiringdiagramsfromNCEthatfollow.

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TrackPickupsandmotorwireconnectionsNoticethatontherightside(positive)trackpickupsfrontblueandtherearblackwiresjoin,andwillconnecttoP8terminalonthe8pinplug.Usearedwireforthisconnection.Similarlyontheleftside,(negative)trackpickupwires,frontblackandrearbluewireswilljoinandconnecttoP4.Useablackwiretomakethisconnection.Seethewiringschematicdiagramsbelow.

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NMRA8PINPLUGCONNECTOR

AnorangewirewillconnecttoP1thepositivemotorleadandjointothepositivemotorterminalatthebottomofthemotor.AgreywirerepresentingthenegativemotorleadwillconnecttoP5andjointothenegativemotorterminalatthetopofthemotor.(UsuallyDCCconformingsetupshavethepositivemotorterminalontop).Ditchlightassembly:Createditchlightsusing3mmsunnywhiteoryellowLEDbulbsand1500ohm½wattresistorsusingbrownwireforoutput3andgreenwireforoutput4andthesewillconnecttofunction1andfunction2solderpoints/terminalsonthedecoderboard.Useacommonwire(blue)toconnectto

Used with permission from Bruce Petrarca, Mr. DCC; MMR #574

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commonsolderpointforlightslabelled"common"connectionforlightsonthe"addingextralights"diagramatthetopleftofthedecoderboard.SeeNCEwiringschematic.

NCEwiringdiagramfortheNCEP2KSRmobiledecoderDrillholesfortheditchlightsjustbelowtheroofofthefrontlowhoodatthemouldedimpressionsofthefrontditchlights.PhotoofDitchlightassemblyinsertedintoshell

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Thedecoderboardand8pinconnecterassemblywillresidetowardsthefrontoftheShellorinthecabinordertoclearthetopleadweight.Allowenoughlengthofthewireconnectingleadstofacilitatethispositioning.

PhotoofDecoderboardandadditionalLEDconnectionsforDitchLights

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Decoderboardand8pinConnectorfinalassembly

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Aftersolderingalltheconnectionstothe8PinPlug,thePlugisinsertedontothemalecomponentofthe8pinconnectoronthedecoderboard.Placethedecoderboardsuchthatthe8pinconnectoroccupiesthespaceinthecab.Ifeverythingfitswearealldone!

ProgrammingCVs:Nowit’stimetoprogramsomeCVs.ThisNCEmobiledecoderhasgreatcapabilitieswhenitcomestofinetuningamotor.Therearecompleteinstructionsforadjustingmotortorqueandstartvoltagesetc.IntheNCEdocumentation.IfyouarepurchasingthisdecoderfromNCEbesuretogetthelatestversion(3.5),asthenewonehas5functionoutputs.Thedecoderdescribedinthisarticleonlyhas4functionoutputs.Ihaveusedfrontandrearheadlights(functionoutputs1and2)andhaveusedfunctionoutputs3and4fortheDitchLights(activatedwithFunctionbuttons1and2).MycurrentCVsettingsareasfollows.TheseareprogrammedusinganNCEPHPro5AmpcommandstationwithawirelessProCab.CN4497NCEP2KSRDecoder.Installdate:June102018CV30SetthisCVto2ontheprogrammingtrackandthedecoderwillresettofactorysettings.Date:June102018SettingCVsShortaddress=3

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LongAddress=4497CV65=Kickstart(0?)CV2=changedto15onJune102018(was?)128speedstepsManufacturer=11DirModeDecoderversion=35ActiveAddressLongShortAddress=3Dirbit=normSPDSTEP=28DCModeNoStandardSpeedTableActiveAddressLongCV2=30(startvoltage)...now30(June102018)needs20forpullingcarsonY2track11!Notaverypowerfulmotor!Typicalrange0-35CV6midvoltage128CV5MaxVoltage255.(1923/4maxvoltage)Momentum3/9viaNCEMomentumbuttonputsvaluesof24and12intoCVs3and4.5/9putsvaluesof40and20intoCVs3and4.7/9gives56and28.9/9gives72and36inCVs3and4.CV3Accelerate=40now56now40CV4Decelerationrate=20now28..now20(June102018)HavenotsetupKickstartyet.CV116...4.(Kickrate)....Now2(June102018)Rangeis0-6.valueof1applieskickscontinuously.Thesmallerthenumberthemoreoftenthemotorgetsabriefvoltage‘kick’.Factorydefaultis0(off)KickDepth=25?IsthisKickStrengthCV117?CV117...(25)..now30(June102018)(Kickstrength)yesasreadonprogramtrackmanually.Tried25butjerkystartsobackto35whichworksfine.NecessaryforlowervoltagetrackssuchasY2track13and11.Usefulrange0-50StoppedhereJune102018.SummaryoflocotuningCVs:asofJune102018:CV2=30CV116=2CV117=35CV3=40CV4=20CV95...130..(Reversetrim)locoseemedtorunfasterinreversethaninforward?Themotorinthislocomotiveisunfortunatelynotverypowerfulandhassometroublenavigatingtheturntableinyard2,andhasmoredifficultywithitsinitialstartsonlowervoltagetrackssuchasyard2tracks11and13.

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ThenextdayJune112018thelocoperformedwell.ItmanagedtoexitYard2roundhouseTrack#5ontoturntableok.Sofarhavenotchangedanyofthesettingsaslistedabove.DougDyerVictoriaBC