ASSEMBLYMANUALFOR
R3500DDIRECTIONFINDINGRECEIVERKIT
Rev.A
May24,2015
WrittenbyCRKITS
Thanksforyourpurchasefromus.ThismodelistheupgradeofPJ-80–an80-mARDFdirect
conversionreceiverkit.Itkeepsthecharacteristicsofsimple,lowcost,easytobuild,andsuitable
forthefoxhuntingandelectronichomebrewingactivitiesamongyoungsters,especiallyforthe
studentsofelementaryandmiddleschools.
Cautions
?Thepowersupplyisswitchedbytheearphoneplug.Afteruse,pleaseunplugtheearphone
toswitchoffthepowersupply.
?Monophonicearphoneisnotcompatiblewiththisreceiver.Usethestereoearphone
insteadasattached.
?Paycloseattentiontodifferthe3diodes:VD1(1N60),VD2(FV1043)andVD3(3V6).They
lookverysimilar,butthelettersprintedonthebodyofdiodecaneasilytell.
?TheEnglishmanualisforyourreferenceonly.PleaserefertotheattachedChinesemanual
formoreinformation.
A.MainSpecifications
1.Frequencycoverage:nonarrowerthan3.5-3.6MHz
2.Sensitivity:Nolessthan600meters(whenreceivesT3500Bfoxtransmitterwithvertical
antenna)
3.Directivity:Theminimumdistanceforexhibitingdirectivityislessthan3meter
4.Powersupply:DC6V(4xAAsizebatteries)
B.CircuitDiagrams
1.BlockDiagram
Seetheprintedmanual.
(Boxesfromlefttoright:Antenna,RFamplifierV1,BeatingfrequencydetectorVD1,AFpre-amp
V2,AFpoweramplifierTDA2822M,earphone.Thelowerbox:Variablebeatingfrequency
oscillatorV3)
2.SchematicandPCBlayout
Seetheprintedmanual.
C.AssemblyInstruction
1.CheckandsolderpartsonPCB
Beforesolder