ISA BOOMERANG NJD-5 User manual

ENTIRECONTENTSCOPYRIGHT© 2007  INFORMATIONSECURITYASSOCIATES
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Rev: January 8, 2008
InformationSecurityAssociates,LLC
BOOMERANG™
NON‐LINEARJUNCTIONDETECTOR
MODELNJD‐5
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OPERATOR’SMANUAL
ISA
Information Security Associates, LLC.

TableofContents
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Section1BoomerangOverview..............................................................1
RecognitionofFalseAlarms................................................2
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Section2BoomerangComponents........................................................3
ElectronicsPackage.............................................................4
Antenna................................................................................4
Cables....................................................................................5
Headset................................................................................5
HandleandPokeStick..........................................................5
CarryingtheNJD...................................................................5
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Section3InitialSetup.............................................................................  6
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Section4Operation................................................................................  9
ImportantNotesOnFullScaleReadings...............................10
UseofAttenuator..................................................................11
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Section5OperationalNotesandHints...................................................  12
“Phantom”ReturnsandInterferingSignals..........................12
ResolvingIndicationsofSemiconductors..............................13
DevicesHiddeninWalls.........................................................14
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Section6MiscellaneousNotes...............................................................  15
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Section7MaintenanceandAccessories.................................................  16
BatteryCharging...................................................................16
FuseReplacement.................................................................16
ReplacementofAntennaClothCovering..............................16
Accessories............................................................................17
Warranty...............................................................................18

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SECTION1
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BOOMERANG™OVERVIEW
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TheBOOMERANG™utilizesaknownphysicalprinciplethatstatesthatanyrectifying
junctionwithsufficientlengthofconductorattachedtoactanantennawillnotonlydetecta
radiosignalandrectifyit,butalsowillcreateharmonicsofthatsignal.Aharmonicisa
wholenumbermultipleoftheoriginalsignal.SincetheBOOMERANG™transmitsona
frequencyof915MHz,its2ndharmonicisat1830MHz(2times915)andits3rdharmonicis
at2745MHz(3times915).
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Overtheyearsmethodsofdetectingthepresenceorlocationofobjectshavebeen
developedthatusearadiofrequencybeamtoindicatethepresenceoftargetsthatcontain
rectifyingjunctions.Themethodofdetectioninvolvesdetectingchangesmadetotheradio
signalbytherectifyingjunctiontarget.RectifyingjunctionsarePNtypesemiconductorsand
thechangethattheymakeistomultiplythefrequencyofthesignalbeamedatthem.
Semiconductorscreateharmonicsorwholenumbermultiples.Targetsareoftendesigned
intotunedcircuitsformaximumdetectionefficiency.Applicationshaveincludeddevicesto
locateskierstrappedinavalanchesandmorecommonlyareseeninelectronicarticle
surveillancesystemstodetershoplifting.Detectorsofthissortconsistofatransmitterand
areceiverthatistuned,forinstance,tothesecondharmonicofthetransmittedfrequency.
Whenthedetector’sreceiverdetectsasignalattheharmonicfrequency,itcanbeassumed
thatthetargetiswithinthepatternandrangeoftheantenna.
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TheBOOMERANG™utilizesthissameharmoniccreationanddetectionphenomenatolocate
devicescontainingsemiconductors:transistors,diodesandintegratedcircuitsusedin
eavesdroppingdevicesandotherelectronicproducts.Thesesemiconductorsdonothaveto
beoperatinginordertobedetected.
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TargetdetectionrangeoftheNJD‐5isafunctionofseveralthings:thepowerofthe
transmitter,thesensitivityofthereceiverincludingtheantennagain,andthenatureor
designofthedevicesbeingdetected.TheNJD‐5hasatransmitteroutputof500milliWatts.
Itsreceiverhasasensitivitygreaterthan‐105dB,meaningthatitcandetectextremelylow
levelsofsecondandthirdharmonicsignalspickedupbyitsantenna
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TheBOOMERANG™NJD‐5iscapableofdetectingcertaincircuitscontainingsemiconductors
foradistanceofupto20feet.AnattenuatorisbuiltintotheNJD‐5tolimitthedetection
rangewhenitistoogreat.
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RecognitionofFalseAlarms
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TheNJD‐5designisbasedontheanalysisofPNjunctionsandthenon‐linearregionofDC
current/voltagecharacteristics.Thesejunctionsradiateseveralharmonicsofthe
fundamentalfrequencyappliedtothem.Thelevelsofharmonicsradiatedbysuchjunctions
varywithrespecttothetypeofmaterialandaresimilarforspecificclassesofjunctions.
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Thevaluesofelectromagneticfieldintensity(thetotalamountofenergyreflectedas
harmonics)forcommonsemiconductorjunctionssuchasGermanium(Ge)PNjunctions,
Silicon(Si)PNjunctionsandGalliumArsenide(GaAs)PNjunctionsarealldifferentfromeach
other.Therespectivedifferenceinlevelsofthesecondandthethirdharmonicsaresimilar,
butthetotalamountofenergyreturnedasharmonicswilldiffer.Thisparameterwillaffect
therangeatwhichadevicecanbedetected.
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Fortheclassesofjunctionsrepresentedbythesecommonsemiconductors,thelevelofthe
thirdharmonicis20dBlessthanthelevelbeingradiatedbythesecondharmonic.Forour
purposes,thismeansthatalmostalloftheenergyreturnedasharmonicsfromthese
semiconductorswillbesecondharmonic.Onlyasmallamountwillbethirdharmonic.
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Thereisanotherclassofsemiconductor‐likejunctionsthatconsistsofnaturallyoccurring
dissimilarmetallicoxides.Thesemetallicoxidescommonlyoccurinbuildingandfurniture
constructionandarefoundinfurnitureandotheroffice‐typeproductslikethreeringbinders
andpaperclips.Inthistypeofjunction,theratioofthelevelsofsecondharmonictothird
harmonicisinverted.Thatis,thelevelofthirdharmonicisapproximately20dBhigherthan
thesecondharmoniclevel.Commonlyknownas"falsereturns",radiationsfromthisclass
ofjunctionscanberecognizedbythehigherlevelofthirdharmoniccomparedtosecond
harmonic.
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ThenonlinearregionofPNjunctionsisphysicallystable.Thismeansthatjarringorphysical
shock,etc.,doesnotalterthenatureoftheirresponsetoRFillumination.The2ndto3rd
harmonicratioremainsthesameandthesemiconductorremainssteady.Nochangesare
seenontheNJD’smeter.
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Thedissimilarmetallicoxidejunctionsthatcause“false”returnsare,ontheotherhand,
generallymuchlessstable.Physicaljarringwillveryoftenaffectthenatureoftheresponse
ofthejunctiontoRFillumination.Suchchangingresponsesareeasilyrecognizedonthe
NJD‐5'smeteraschangesinthelevelsoftheharmonicsandcanbeheardasstaticinits
headset.
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Thus,theoperatorcanalmostalwaysdistinguishbetweenasemiconductorandafalse
returnthatisinthefieldofviewoftheNJD‐5’santenna.Determinationofthetypeof
junctiondetectedcanusuallybemadebyobservingthelevelsdifferencesbetweenthe
detectedlevelsofharmonicsontheNJD‐5’smeterdisplay.
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SECTION2
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BOOMERANG™COMPONENTS
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ELECTRONICSPACKAGE
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TheNJD‐5'scircuitryiscontainedintheelectronicspackage.Allaspectsofoperationare
controlledhere.
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Therearereceptaclesfortheantenna’scoaxcables,themetercable,andheadphones.
Controlsincludepoweron/off,headphonevolume,andtrip(thresholdforthetarget
detectiontone).
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Ameterforbatterychargelevelislocatednexttotheon/offswitch.Itwillindicatebattery
levelonlywhentheNJDisturnedon.
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Therearealsotwoslideswitches.One,marked“Normal/ReceiverOnly”turnstheNJD‐5
transmitteronandoff.Thisaidsindeterminingifastronginterferingsignalisbeingcreated
bytheNJD‐5interactingwithsomesortofcircuitryintheareabeingexaminedoriftheNJD‐
5isdetectinganothertransmitteroperatingon1830or2745MHz.
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Theswitchmarked“Normal/2ndOnly”isusedtoturnoffthe3rdharmonicreceiver.Thisis
usefulwhenareturnneedstobeevaluatedindepth.TheaudiosectionoftheNJD‐5
switchesbetweenthe2ndand3rdharmonicreceiversatarateofabouttwotimesper
second.Sometimesthereisclear(oratleastperceptible)audioontheharmonicreturns
fromlisteningdevices.Bylisteningtoonlythesecondharmonicreturn,information
regardingthenatureofthedetecteddevicecanbegathered.
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Thebatterychargerjackandthefuseholderarelocatedonthebackpanel.
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TheNJD‐5isequippedwithadialattenuatorin‐linewiththetransmitteroutputtolimitthe
strengthofthetransmittedsignal.Theattenuatorisadjustablein3dBstepsfrom0to30
dB.Setat9dB,thetransmitterwillputoutapproximately62.5milliWatts.Thisisa
recommendedsettingformostuses.Operationathigherpowerlevelsincreasesthe
likelihoodofdetectingelectronicdevicesoutsidetheareabeingsearched.
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ANTENNA
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TheBOOMERANG™antennaassemblyconsistsofarectangularhousingthatcontainsthe
actualantennas.Thedesignandsizeoftheantennaistoeliminateanyreflectionscoming
fromthesideorrear.Theantennahousingalsocontainsbandpassfiltersforthe2ndand3rd
harmonicfrequenciestopreventanyunwantedsignalsfromreachingthereceivers.
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Theantennamaybemountedonthecollapsiblehandleorusedasahand‐heldunit.
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TwoLEDbarographmetersaremountedontheantennainameterbox.Themetersgivean
indicationofthestrengthofthereceivedsignals.TheredLEDindicatorisforthe2nd
harmonicandthegreenLEDisforthe3rdharmonic.Visualcomparisonofthestrengthsof
the2ndand3rdharmonicswillindicatewhethertheNJDhasdetectedasemiconductor(very
high2ndharmonic,low3rd)oracorrodedmetallicoxide(3rdharmonicisequaltoorgreater
than2nd).

TheNJD‐5antennaisconnectedtothehandlebymeansofanadjustableswivel.Theswivel
isscrewedontothethreadsofthemountingbracketontheantenna.theswivelcanbeused
asahandgripwhenusingtheNJDinahandheldmode.

Themalethreadofthebracketontheantennahastwoslotsmachinedintoittobeusedto
locktheantennaincertainorientations.

CABLES

TheNJD‐5electronicspackagecontainsatransmitterandreceiver.Theseareconnectedto
theantennabymeansofcoaxialcables.Thecablesare8feetinlength.Connectorsforthe
variouselementsareconfiguredinsuchawaythatitisnotpossibletoconnectthecables
incorrectly.Thetransmittercannotbeconnectedtothereceiver'santennaandviceversa.

CoaxialcablesusedatBOOMERANG™operatingfrequenciesareverycritical.Careshould
betakenthatthecablesarenotoverlystrainedbybendingattheconnectors,beingstepped
on,etc.

Ifacable‐connectorjunctionbecomesfrayedorifadegradationofperformanceoccurs,
switchtotheothersetofcablessuppliedwiththeNJD‐5untiltheconnectorcanbe
repaired.TheNJDissuppliedwithtwosetsofcoaxialcables.

TheNJD‐5antennamounteddisplayisdrivenfromtheelectronicspackageviathemeter
cable.TheNJD‐5issuppliedwithan8footlongmetercable.Thiscablealsoservesa
batterysavepurpose.PowertooperatetheNJD‐5isroutedthroughthemetercable.
WhenthecableisremovedfromitsjackontheNJDelectronicspackage,thebatteryis
disconnected,makingitimpossiblefortheNJD‐5toconsumebatterypowerwhileinthe
storagecase.



Page5

HEADSET

TheNJD‐5hasoneheadsetjackontheelectronicspackage.Thejackisa1/4"monojack.

HANDLEANDPOKESTICK

Theantennaismountedtoatelescopinghandle.Thehandleisadjustableinlengthfrom
19"to57".CablesareattachedtothehandlebymeansofVelcrostraps.Theantenna
swivelcouplestothehandleinatwistlockmethod.

Thepokestickisatelescopingrodthatisusedtotaponsurfacestotrytodislodgecorroded
metallicjunctions.


CARRYINGTHENJD

TheNJD‐5issuppliedwithabackpackstylecarryingharness.Useofasingleshoulderstrap
isnotrecommendedbecauseitleadstorapidoperatorfatigueanddiscomfort.The
backpackharnessallowstheNJD‐5tobecarriedonthelowerbackwherecontrolsare
accessibleandweightisevenlydistributedacrosstheshoulders.


BATTERYCHARGER

TheNJD‐5issuppliedwithaplug‐inbatterycharger/externalpowersupply.Thesupplycan
operatetheNJD‐5whilechargingitsbattery.Thesupplyoperatesoverarangeof100‐240
VoltsAC,50or60HertzandrequiresnoswitchselectionbytheuserforprimaryACvoltage.

TheNJD‐5isdesignedtooperatefromitsbattery.ContinuedoperationusingtheACpower
supply/batterychargermayoverchargethebatteryandshortenitsusefullife.Donot
chargetheNJD‐5formorethan8hourswhenfullydischarged.



Page6


SECTION3

INITIALSETUP

1.Removetheelectronicspackagefromthestoragecase.

2.Removetheantennaassemblyandswivelmountfromthestoragecase.

3.Attachtheswivelmounttotheantenna.

A.Ontherearoftheantenna,notethe5/8"malethreadbelowthedisplay.
LocatethetwoVshapedslots.Notethattheyare90oapartandremember
wheretheyare.

B.Notethenylonthumbscrewontheswivelassembly.Backitoutfarenoughso
itdoesnotprotrudeintothe5/8"femalethread.

C.Screwtheswivelfarenoughontotheantennasothatthethumbscrewcanbe
seatedinoneoftheslots.Theslotsallowtheusertoselecteitherverticalor
horizontalpolarityandtolocktheantennatokeepitfromrotating.Lineup
thethumbscrewwitheitheroneoftheslotsandtightenitdown.

D.Donotdisassembletheswivelwiththethumbscrewtightened.Itmustbe
loosened.

4.Connectasetofcoaxialcablestotheantenna.Thecoaxialcableassemblyisbuiltwith
maleandfemaleconnectorstopreventincorrectconnectionofantennaelements.

5. Connectthemetercabletotheelectronicspackageandtothemeterdisplayboxon
theantenna.Alsoconnectthecoaxialcablestotheelectronicpackage.

6.Removetheextendibletelescopingantennahandlefromthestoragecase.Itisstored
inthefoampaddinginthelid.

7.Extendthehandletoaconvenientlength,usuallyabout3feet.Todoso,loosenthe
knurledlockringsbytwistingthemtotherightandslideoutthesectionsoneata
time,startingwiththebottomsection.Donotpullthetelescopingsectionsouttoofar
orwithtoomuchforceortheymaybindandmakeithardtocollapsethehandle.
Tightenthelockringsfirmlybyhand.Insertthebayonetfittingontheantennaswivel
mountintothesocketontheendofthehandle.Thefittingisatwistlocktype,and
willclickintoplacewhensecure.Toremove,pushdownandtwisttheopposite
direction.

Page7



8. AttachthecoaxialcablesandthemetercablestothehandleusingtheVelcrostrips
providedwiththeNJD‐5.

9.Inserttheheadsetpluginthejackonthesideofthemeterbox.

10.TochecktheoperationoftheBOOMERANG™,firstturntheVOLUMEcontrolto12
o'clockandturntheTRIPknoballthewayclockwise.

11.SwitchtheON/OFFswitchtotheONposition.

AdjustthevolumeontheheadsettoacomfortablelevelwiththeVOLUMEcontrol.

NowsetthealerttonethresholdwiththeTRIPcontrol:

WhenadjustingtheTRIPcontrol,makesuretheantennaisnotpointedatany
electronicequipmentorattheelectronicspackage,asareturnsignalwillbereceived
andindicated.

TurntheTRIPcontrolcounterclockwise.Asyouturnpastacertainpoint,the800
Hertztonewillcomeon.Turntheknobslightlybackclockwiseuntilthetonestops.

SettheAttenuatortothe9dBsetting

12.Removethetesttargetfromitsenvelope.Holditbetweenthumbandforefingerin
frontoftheantenna.Ifitisheldclosetotheantenna,bothmeterswillgofullscale
andthetoneheardintheheadsetwillbesteady.Asthetargetismovedawayfrom
theantenna,thetonelessensinintensityandthemetersbegintodrop.

13.TheNJD‐5mustbecapableofdetectingthetesttargetheldbetweenthumband
forefingerforadistanceofatleast2feetwhenthetargetisorientedparalleltothe
shortsideoftheantennaandtheattenuatorissetto9dB.Thistestwillgiveyoua
futureindicationastowhetherthesensitivityofyourBOOMERANG™hasdecreased.

14.PracticewithtargetssuchasthetesttargetsuppliedwiththeNJD‐5,portableradios,
telephonesandanyothercommonobjectscontainingsemiconductorstodevelopa
feelfortheperformanceoftheNJD‐5.

Page8



15.Theantennahasadetectionpatternwhichisnotsymmetrical,andexperimentation
withthetesttargetandotherdeviceswillshowyouwhatthepatternis.Ifthe
antennaiswithin2feetofatarget,thepatternisnotasimportant.Thisisthereason
theantennaisheldclosetothesurfacebeingsearched.

16.TheNJD‐5'santennaradiatesapolarizedsignal,meaningthatthesignalfromthe
targetwillgivedifferentresultswhentheantennaisrotated90degrees.Thesignalis
orientedvertically,paralleltotheshortsideoftheantenna.Trydifferentorientations
oftheantennaandthetargettogetthestrongestreturnsignal.

17.Attachthebackpackstylecarryingstrap.Cliptheshortendsofthestraptothering‐
likehandlesontheelectronicspackage.Clipthelongendstothesideoppositethe
shortendssothestrapformsan"x".Connectthestrapssothecablescomeoffthe
rearoftheNJD‐5andwillnotinterferewiththestrapswhentheNJD‐5iscarried.

KeepthestrapfairlylongsotheNJD‐5electronicspackagerideslowontheback.This
waythecontrolscanbereachedwithouthavingtotakeoffthebackpack.

Usetheloop‐likecheststraptoadjusttheshoulderstraplocationontheshouldersfor
morecomfort.

Page9

  
SECTION4

OPERATION

1.RefertoSection3toassembleandactivatetheBOOMERANG™.

2.Investigateeachwallbystartinginonecornerand"painting"thewallwiththeantenna
fromthetopdowninverticalrows,movingtotheothercornerofthewall.Theantenna
canbemovedatarateofapproximately2timestheantenna'sverticalsizepersecond
overthesurface.Responsetosemiconductorsisnearlyinstantaneous.Examineother
roomsurfacesincludingfurnitureinasimilarmanner.

3.Ifa2ndharmonicisreceivedandno3rdharmonicispresent,asemiconductordeviceisin
thesignalpath.Themeterwilllooksomethinglikethis:




 Metershowing
  returnfrom
  semiconductor

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Inmostinstances,whenasemiconductorisdetected,the2ndharmonicmeterwillbefull
scalebeforethe3rdharmonicmeterdisplaysanyreturnatall.

4.Ifthenon‐linearjunctionyouhavedetectedisametal‐to‐metalcontactsuchasa
sheetrockscrewinasteelstudortwodissimilarmetals,therewillbeasignificantamount
of3rdharmonicshowingonthedisplay.Seethefigureonthenextpage.Thumpingthe
wallwithyourfistorthepoke‐stickwillcauseeitheranintermittentnoisysoundinthe
headsetorthesignalmaydisappearaltogetherifyouhavedislodgedthejunction.If
eitheroccurs,acorrosivejointtypenon‐linearjunctionhasbeenencountered.Ifonlya
3rdharmonicsignalisreceived,itshouldbeignored.
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Commonlyencounteredsourcesof3rdharmonicfalsereturnsincludethefollowing:
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 Paperclipsindeskdrawers
Ballbearingdrawerslidesindesks
Filecabinetsandcredenzas
Springsinupholsteredfurnitureandmattresses
Wirehangersusedtosupportsuspendedceilings
Threeringbindertypenotebooks.
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HARMONIC LEVEL
3rd
2nd

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Detectionofcorrodedmetallicobjectswillproduceameterdisplaythatlookslikethe
followingtwodrawings,onewherethemetershowsahighlevelof3rdharmonicwithlittle
2nd,andonewherethemetershowsanequallevelof2ndand3rd.Whatisimportanttonote
isthatthereisahighlevelof3rdharmonicinbothcases.
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  High3rdharmonic
  levelindicates
  corrodedmetallic
  junction
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Bothmetersshowa
strongreturn.This
indicatesacorroded
junctionbecauseofthe
highlevelof3rdharmonic.
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IMPORTANTNOTEONFULLSCALEREADINGS
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Ifboth2ndand3rdharmonicdisplaysarefullscalewhenlookingatatarget,theoperatorcan
notknowwhichisstronger.Allsemiconductorsradiateasmallamountof3rdharmonic.If
theantennaisrightontopofastrongreturn,itisquitepossibletopeakbothmetersor
evenoverloadthereceiver.Theoperatormustthendeterminewhichhasthestrongest
signal.
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
Bothmetersare
fullscale.The
operatorcannot
tellwhichisthe
strongersignal.
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HARMONIC LEVEL
3rd
2nd
HARMONIC LEVEL
3rd
2nd
HARMONIC LEVEL
3rd
2nd

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Todeterminewhichhasthestrongestsignal,keeptheantennaaimedatthetargetand
simplybackitawayfromthetarget.Thefurtherawayitisfromthetarget,theweakerthe
signalsbecome.Keepbackingawayuntilthemetersarebackonscaleandthestrongest
signalcanbedetermined.Orusetheattenuatortolowerthetransmitterpower.
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UseoftheAttenuator
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TheNJD‐5isverysensitiveandcandetectcertaintypesofelectronicdevicesfromseveral
feetaway.OccasionallytheNJD‐5willbeusedinanenvironmentwheretherearealotof
readilydetectableelectronicdevices.Theymaybedetectedinmanydirectionsfromsome
distanceaway.Whenthisisthecase,itmaybedifficulttodeterminewhatexactlytheNJD‐
5isdetecting.
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Thesolutiontothisdilemmaistolessenthepowerofthetransmitter,whichinturnlimits
thedetectionrangeoftheunit.TheNJD‐5hasabuilt‐indialtypeattenuatorthatlowersthe
transmitteroutputin3dBsteps.Eachadditional3dBofattenuationthatisaddedcutsthe
transmitterpowerbyonehalf.ThreedBofattenuationcutsthe500milliWattoutputto250
milliWatts;6dBcutsthepowerto125milliWatts;9dBcutsthepowerto62.5milliWatts
andsoon.
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Keepinmindthatthedetectionrangeatthelowerpowersettingsisreduced.Bemore
painstakingintheuseoftheNJD‐5.
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SECTION5
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OPERATIONALNOTESANDHINTS
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"Phantom"ReturnsandInterferingSignals
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ReflectedSignals
Radiowavesbounceorreflectoffofmetalobjects.Thisistrueforthesignal
transmittedbytheNJD‐5andforsignalsradiatedbynonlinearjunctions.Occasionally,
therewillbeametalsurfaceontheoppositesideofawall,forexample,orperhapsin
thefieldofviewoftheNJD‐5.Thisobject,whichcouldbeamirrororametalcabinet,
willreflecttheNJD‐5'ssignal.Itispossiblethatthesignalcouldilluminateanonlinear
junctionthatisactuallyinbackandofftoonesideoftheantennaandtheradiated
harmonicmightbestrongenoughtoreflectoffthemetalsurfaceandbedetected.If
oneofthese"phantomsignals"isdetected,changingtheangleoftheantennashould
eliminateit.Visuallyinspecttheothersideofthewallifthereisametallicsurfacethat
youcannotseefromtheareabeingswept.
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InterferingSignals
Inrarecircumstances,theremaybeasignalbeingdetectedbytheNJD‐5which
appearstocomefromalldirectionsandchangingthedirectiontheantennaispointing
indoesnoteliminatethesignal.Thisiscausedbyasignalfromanothertransmitter
operatingatexactly1830or2745MHz.
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Todetermineifthisisthecase,placetheNORMAL/RECEIVEONLYswitchonthepanel
oftheelectronicspackageintheRECEIVEONLYposition.ThisturnsofftheNJD‐5's
transmitter.Iftheinterferingsignaliscausedbyatargetcreatingastrong2ndor3rd
harmonicoftheNJD‐5'stransmittedsignal,turningoffthetransmitterwilleliminateit
andtheNJD‐5’sLEDmeterswilldroptoalowposition.
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Iftheinterferingsignalisbeingradiatedbyanothertransmitter,themeterswillnot
dropwhenthetransmitteristurnedoff.Theoperatormustthenlocatethesourceof
theinterferingsignalbyusingRFdetectionequipment.Theoperatormustdetermine
whetherthesignalisemanatingfromtheareabeinginvestigatedorwhetheritis
emanatingfromoutsideofthearea.
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Iftheinterferingsignalcannotbeturnedoff,theeffectivenessoftheNJD‐5willbe
greatlyreduced.
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ReturntheswitchtotheNORMALpositionaftercompletingthisevaluation.

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PagerInterference
Pagersareanothersourceofinterference.Certainpagershavecircuitrythatamplifies
theradiatedharmonicsandcanbedetectedforupto20feet.Wearingapagerwhen
usingtheNJD‐5isnotrecommendedbecauseofthefalsereturnstheycancause.
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Certaintypesofstationaryelectronicequipmentcancausesimilarproblemsoflong
distancedetection.Ifthisisencountered,eitherremovetheequipmentfromthearea
orusetheNJD‐5pointingawayfromtheoffendingequipment.
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ResolvingIndicationsofSemiconductorDevicesHiddeninWalls
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Whensearchingawall,bearinmindtheofficeontheothersideofthewallmighthave
electronicdevicessuchasatelevisionset,telephone,radio,calculator,etc.closetothewall.
TheNJD‐5willoftendetectsuchtargetsfor5‐8feet,eventhroughawall.Ifastrong2nd
harmonicreturnisencounteredwhilesearchingawall,itmustbedeterminedwhetherthe
NJD‐5isdetectinganobjecthiddeninthewalloranobjectintheadjoiningroom.
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Todothis,visuallyexaminetheadjoiningarea,lookingforlegitimateelectronicdevices.
KeepinmindthepointwherethereturnwaslocatedandthattheNJDcanoftenseeseveral
feetintotheadjoiningroom.Ifitissuspectedthatalegitimateelectronicdeviceisthecause
ofthereturn,movethedeviceandusetheNJD‐5tolookfromtheadjoiningareabackinto
theroomunderinvestigationatthespotofthereturn.KeeptheNJD’santennaclosetothe
wall.Ifthereisnoreturndetected,thelegitimatedevicewaswhatwasfound,andnot
somethinghiddeninthewall.
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Ifthereturnisstillpresent,moreinvestigationisrequired.Thefollowingstepsmaybe
taken:
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•Performacarefulvisualinspectionforapinholeopeningatthetargetareawhich
wouldallowamicrophonetopickuptheroomaudio.
•Trytogetaudiofromthereturn.TurntheTRIPknobontheelectronicspackage
fullyclockwiseandsetthereceiverselectionswitchtothe2ndONLYposition.This
willdisablethetone,allowingyoutolistentothe2ndharmonicreceiveronly.
Occasionallyareturnwillcontainroomaudioanditcanbehearditinthe
headset.Whistling,clappingyourhands,ormakingothersharploudnoisescan
helpyouidentifyroomaudiopickup.
•Ifyoumustlookinsidethewall,asmalldiameterborescopecanbeusedwith
littledestructiontothewall.
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Wallsorpartitionsbuiltofsteelorwoodenstud‐wallconstructionoftenextendabovethe
ceiling.Ifthisisthecase,andtheceilingisasuspendedtype,liftoutaceilingtile.Makea
smallopeninginthewallabovetheceilingandinspectthewallcavityfromabove.
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Wallcavitiescanbeinspectedfrombelowbyremovingthebaseboard.Inmanyofficesthis
moldingisarubberorplasticstripthatcanberemovedandre‐installed.
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Ifthewallhasapaperedsurface,makeaslitinthepaperandpeelitbackenoughtocreatea
smallopeningintothecavity.
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Anangledinspectionmirrorandflashlightcanbeusedfortheseinspections.
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SECTION6
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MISCELLANEOUSNOTES

1.IttakesapproximatelysixhourstofullychargethebatterywiththeNJD‐5turnedoff.
Nocables,exceptforthechargercableneedtobeattached.

Shouldthebatteriesrunlowduringuse,theBOOMERANG™canbeusedwiththe
charger/externalsupplypluggedin.

2.ThefullychargedBOOMERANG™willoperateforapproximatelyeighthoursbefore
rechargingisrequired.
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3.BatteryLevelMeter.Nexttotheon/offswitchisameterindicatingthelevelof
chargeinthebattery.Whenthemeterisfullyinthegreensection,theNJDischarged.
Whenthemetermovesfromthegreentotheredsection,thereislessthan1hourof
operatingtimeleft.

TheNJDalsohasafeaturethatturnsofftheLEDmeterswhenthebatteryreachesa
certainlevelofcharge.Thisavoidsthegradualdeteriorationofdetectionabilitythat
occurswhenthebatteryreachesacriticallevelofdischarge.

4.TakecarewhenconnectingcablestotheNJD.Ifthereisanattempttoplugthe
headsetintothechargejack,thebatterywillbeshortedandtheinternalfusewill
blow.

5.TheNJD‐5coaxialcablesuseTNCconnectors.Lookingattheinsideoftheconnector
willshowthatthereareleafspringfingersontheinsideofthemaleconnector.Ifyou
havetroubleattachingtheconnectortothepanelfitting,inspecttheconnectorfora
leafspringwhichmayhavebecomebent;ifso,pressgentlyforcingtheleafspring
backagainstthecenteroftheconnector.

6.TheNJD‐5issuppliedinaruggedfoamlinedcarrying/storagecase.Thecaseprotects
theNJDwhileintransit.Wheninthiscase,itcanbesafelycheckedasairlineluggage
orshippedviaairfreight.
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SECTION7
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 MAINTENANCEANDACCESSORIES

BATTERYCHARGING

Thebatterywillindicateaneedtobechargedbyoneof2ways.

1.Themeternexttothepoweron/offswitchonthefrontpaneloftheelectronics
packageisintheredposition.Chargingisrecommendedwhentheunitisnotinuse
andthemeterishalfwayupinthegreenarea.

2.TheLEDsonthemeterdonotilluminatewhentheunitisturnedonanditwill
notdetectatarget.Ifthereissomedeflectioninthebatterylevelmeterwhenthe
unitisturnedon,butitdoesnotoperate,thisindicatesthatthebatteryhas
dischargedtoalevelbelowoperational.

Tochargethebattery,connectthechargertotheCHARGEjackontherearpaneloftheNJD‐
5'selectronicspackage.PlugthechargerintoanACoutlet.Thechargerisratedfor110‐240
VACprimaryvoltage.Afullchargewillbemadein6hours.Chargingformorethan8hours
canoverchargethebatteryandshortenitsusefullife.

TheBOOMERANG™isdesignedtouseitsbatteryastheprimarypowersource.The
BOOMERANG™maybeusedwhilecharging.Extendedoperationusingtheexternal
charger/powersupplywilldamageorshortenthelifeofthebattery.
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FUSEREPLACEMENT

IftheLEDsontheantennameterboxdonotlightandthemetercableisproperlyconnected
andthepowerswitchisontheONposition,checkthefuse.Thefuseholderislocatedon
therearpaneloftheNJD‐5electronicspackageneartheserialnumber.Sparefusesare
suppliedwiththeNJD‐5.Fuseis2.5amps,TypeGMA(5x20mm).


REPLACEMENTOFANTENNACLOTHCOVERING

1.RemovetheoldcoveringwhichisheldonwithVelcrostrips.DonotremovetheVelcro
fromtheantennaortamperwiththeantennacoverplate.

2.Installthenewcovering.UseonlyanISAreplacementcovering.Someclothmaterial
maycontainmetallicthreadsandwillaffecttheoperationoftheBOOMERANG™.
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ACCESSORIES
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QuantityPartNo. Item
25258Fuse‐2.5amp5x20mm
141068BoomHandle
141077EndBoltandAntennaSwivelMount
141079Target
441069VelcroStrips
141055Manual
141075SmallAccessoriesPouch
141080MonoHeadsetw/1/4"Plug
141085PokeStick
1411663footACCord
141164SwitchingDCPowerSupply/Charger
141165BackpackHarness
2410718ft.CoaxCable
1411408ft.MeterCable
141066Antenna/Meter
142014Storage/CarryingCase
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18
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
Warranty

InformationSecurityAssociates,LLC,warrantstotheoriginaluserthatitsproductsare
freefromdefectinworkmanshipandmaterialforaperiodofoneyearfromthedateof
purchase.InformationSecurityAssociates,LLC,underthiswarranty,islimitedto
correctingorreplacingwithoutcharge,atitsfactory,anypartorpartsthereofwhichshall
bereturnedtoitsfactory,transportationprepaid,anduponexaminationbyInformation
SecurityAssociates,LLC,shallbefoundtohavebeenoriginallydefective.

INFORMATIONSECURITYASSOCIATES,LLC,SHALLNOTBELIABLEFORLOSSORDAMAGE
CAUSEDEITHERDIRECTLYORINDIRECTLYBYUSEOFITSPRODUCTS.THISWARRANTY
SUPERSEDESANDISINLIEUOFALLOTHERSEXPRESSEDORIMPLIED.NOOTHER
LIABILITIESMAYBEASSUMEDUNLESSAUTHORIZEDINWRITINGBYINFORMATION
SECURITYASSOCIATES,LLC.

Forservice,technicalquestionsandproblemscontact:

InformationSecurityAssociates,LLC.
6SpruceBrookRoad
Seymour,CT06483
USA
Tel:203736‐9587
Fax:203736‐9639
www.isa‐technology.com
isa‐[email protected]
