TANDBERG TR-2075 User manual

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Contents:
PowerON/OFF switch.................................................................................................. Page3
Extrapowersockets........................................................................................................ Page3
Lightdim........................................................................................................................... Page3
FMAntennas..................................................................................................................... Page4
Tuningon FM.................................................................................................................... Page6
AMAntennas..................................................................................................................... Page8
Grounding....................................................................................................................... Page8
Tuningon AM................................................................................................................... Page9
Volume-Balance .......................................................................................................... Page9
ToneControls.................................................................................................................... Page9
Stereo-mono switching..................................................................................................... Page10
UseofPREAMP OUTand MAINAMP INsockets.......................................................... Page10
Filters................................................................................................................................ Page11
Headphones...................................................................................................................... Page12
Loudspeakers.................................................................................................................. Page13
Roomacoustics............................................................................................................... Page14
Stereotips....................................................................................................................... Page14
Speakerselector.............................................................................................................. Page15
Outputpowerindicator................................................................................................... Page15
Listeningtorecords............................................................................................................ Page16
Playbackfromtaperecorders(TAPE1and TAPE2)....................................................... Page17
Recordingfromthereceiver................................................................................................ Page18
Recordingfromatranscriptionunit..................................................................................... Page19
Copyingtape................................................................................................................... Page20
Recordingonathirdtaperecorderwithorwithoutaudiocontrols...................................... Page21
Monitoringduringrecording........................................................................................... Page22
4Channeluse................................................................................................................. Page22
Simultaneousrecordingofaradio/transcriptionprogramandplaybackof
anotherprogramfromtape............................................................................................ Page23
Plugs.................................................................................................................................. Page24
Usefuldata......................................................................................................................... Page24

3
PowerON/OFF switch
Makesurethatthereceiverismarkedwiththecorrect
a.c.voltageforyoursupply.
SwitchthereceiveronbydepressingtheON/OFF-button.
Anotherpushonthebuttonwill releaseit andswitchthe
receiveroff.Thisbuttonalsocontrolsthepowertooneofthe
extrapowersocket, markedSWITCHED,atthehackofthe
receiver(moredetailsbelow).
NOTE!
Whenswitching onyou will notice thatnothinghappensuntil
about3secondsafteryou havepushedtheON/OFF button.
Thenyou will hearaclickfrominsidethecabinetand the
receiverbecomeslivesmoothlywithoutaudibleswitching
transientsinthespeakers.
Extrapowersockets
Threeextrapowersocketsareprovidedatthebackofthis
receiver.TheseextrasocketsareintendedforotherHi-Fiunits
and reduce thenumberofuntidypowercables.
Twoofthesocketsby-pass theON/OFF-buturn
and areliveassoonasthereceiverpowerplugislive.These
socketsaremarkedUNSWITCHEDand thetotalcombined
powerdrawnfromthem mustnotexceed200 W. These
socketsareusefulforconnecting Hi-Fiunitshavingtheirown
powerON/OFF switches.
ThethirdextrapowersocketismarkedSWITCHEDand is
controlledbytheON/OFF switchonthereceiver.Thissocket
issuitableforaHi-Fiunit thatdoesnothaveitsownON/OFF
powerswitchand thetotalpowerdrawnfromit mustnot
exceed100 W.
Checkthepowerconsumptionoftheunitsyou connect
totheseextrasocketstoensurethatitfallswithinthe
permissibletotalrating.
NOTE!Whenusing aswitchedwall socketrememberto
releasetheON/OFF-buttononthereceiverbeforebreakingthe
powerwiththeswitchedwall socket. Otherwiseyou will hear
aloudclickinthespeakerswhenswitchingon.
Lightdim
Ifthescaleandmeterlightsaretoo bright, depress the
LIGHTDIMbuttonontheextremerightsideofthereceiver.
Anotherpushonthisbuttonwill restorethelightstofull
brightness.
3

4
FMAntennas
Whattypeofantennadoyou need?
Yourneedforagoodantennawill depend on thereceiving
conditionswhereyou live;thefurtheryou areawayfromthe
transmitterandthemoreobstacles(hillsand tall buildingsfor
example)betweenyou and thetransmitter, thegreaterwill he
yourneedforagoodantenna. Rememberthatit isnotgood
enough justtoreceiveasignal,especiallyifyou areaserious
stereolistener. You needtoreceiveasignalthatismuch
strongerthananyunwantedelectricalnoisethatmightbe
lurking around inyourarea. Furthermore, FMsignalsbounce
off largeobstaclesand causeyou toreceivethesameprogram
fromseveraldirectionsatthesame time, possiblyoutof
phasewithoneanother.Thisgivesdistortionwhichyou do
notwant.Insteadyou needonestrong, clearsignalstraight
fromthetransmitterand thismaycall foranelaborate,
directionalantenna.
Ifindoubtyou canconsult yourdealerwhowill probablybe
morefamiliarwithlocalreceivingconditionsthanmost
people.Inanyeventyou shouldinstall anantennathatis
betterthantheonethatyou thinkyou canjustmanagewith,
becauseunderdoubtfulconditionsagoodantennaisjustas
importantasgoodloudspeakers.
Whetheryou needasimpleantennasuchasafoldeddipoleor
anelaboratemulti-elementarray, thefollowing tipswill be
useful.
Antennaconnections
Thisreceiverisequippedwithabalancedantennainputand
anunbalancedantennainput.
The300 ohmbalancedinputterminals(socketonEuropean
version)areintendedforconnectiontoa300ohmantennavia
aflattwin-leadbalancedfeederhavingthesame impedance.
The75 ohmunbalancedinputterminals(socketonEuropean
version)areintendedforconnectiontoanantennaviaa75
ohmcoaxialcable.Thecenterconductorofthecableshould
beconnectedtotheterminalmarked75 ohmsandtheshield
shouldbeconnectedtothechassisterminaljustbelow.
Ifyou havetheEuropeanversionyou shouldfit the
appropriateplug.

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Asimplefoldeddipoleantenna
Asimplefoldeddipoleforconnectiontothebalancedinput
canbeeasilymadefromflattwin-leadwithanimpedance of
240to300ohms, A135 cm (53")piece ofantennalead
shouldbeusedfortheloop. Stripoff approximately1cm
(1/2'') ofinsulationateachendandsolderasshown. Cutone
ofthewiresinthemiddleoftheloopandconnectanother
twin-leadtoactasfeedertotheinput.Solderasshown.
Thisantennacanbeusedindoorsoroutdoors. Whenused
outdoorsthesolderjointsshouldbeprotectedagainstthe
weatherand theloopcanbefixedtoaflatwoodenboard.
Whenusedindoorstheloopcanbefixedtoanyconvenient
non-metalicstructureoraflatwoodenboard.Theimportant
requirementinall casesisthattheloopshouldbefirmly
fixed,horizontal, and straight.
Toobtaingoodreceptiontheloopshouldbeapproximately
atrightanglestothetransmitter(seediagram)although the
bestorientationmayhavetobefound experimentally.
Typicalmulti-elementantenna
Thediagram shows atypicalmulti-elementantennaforuse
wherereceivingconditionsaredoubtful. Thistypeof
antennawill providetypi-cally6dBmoregaincompared
withafoldeddipole(theantennasignalfedtothereceiver
isdoubled).
Manytypesofmulti-elementarraysareavailableand some
canevenberotatedeverytime you tuneintoadifferent
station.Yourdealerwill adviseyou oryou canbuy
specialistliteratureandbecome anexpertyourself.

6
Tuning on FM
SelectFMreception bydepressingtheFMbutton.
Theredlightoverthebutton will lighttellingyou that
thereceiverisintheFMmode.
Usethelargeknob ontherightsideofthescaleto
tuneintherequiredstation.
NOTE! MakesurethatthePREAMP REC
buttonisreleased.
Correcttuningisimportant,particularlyforstereo,if
distortion istobeavoided. Thisreceiveristhere-fore
equippedwithtwotuningmeters, oneindicatingsignal
strength(SIGNAL)and theotherindicatingmidscale
forexacttuning(TUNING). Firstadjustthetuning
knob formaximumdeflection ontheSIGNALmeter
and thenmakeafinalfineadjustmenttoobtain
midscaledeflection ontheTUNINGmeter.
Thefrequencycalibration ofthescaleisaccurateto
within±200 kHz. Sodonotbeconfusedifastation
transmittingon, forinstance, 103.9MHztunesinat
104.1MHzon thescale. Thisisstill withinthe
tolerance. Thescaleissimplyaguideandwhatreally
mattersisthatyou usethetwotuningmeterscorrectly.
Muting
Thehighamplification necessarytoobtaingood
sensitivityand limitinginhighclass tuners, makes
tuningnoisy. Toavoidthis, amutingcircuit blocksthe
receiverautomaticallywhennosignalisreceivedorif
thesignalistoweaktogivesatisfactorynoise
suppression. Toreceiveastation thatisnotstrong
enoughtocanceltheblockingeffectofthemuting
circuit, thecircuit canbeswitchedoff.
ThemutingfunctionisactivatedbydepressingtheFM
mutingknobontheextremerightsideofthefront
panel. Anotherpushon thebutton will releaseit and
cancelthemuting.

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Stereo/mono
ThisreceiverisfullyequippedforthereceptionofFM
stereobroadcasts.
FMstereobroadcastingisbasedonthepilottonesystem
whichallows theprogram tobereceivedinmonoonmono
receiverswithoutimpairmentofprogram quality.Itisan
inherentpropertyofthissystem thatastrongersignalis
neededinstereotoobtainthesame noisesuppressionasin
mono. TheFMstereodecoderautomaticallyswitchesto
stereooperationwhenastereosignalofsufficientstrengthis
received.Ifthestereosignalfallsbelowapresetthreshold,
theprogram will beautomaticallyreproducedinmono.
However, it ispossibleforthestrengthofastereosignalto
beadequateand yetforthesignaltobetemporarilydisturbed
bynoiseordistortion. Inthiseventdepress theFMMONO
buttonwherebytheprogram will bereproducedinmono
withoutnoiseordistortion.
Becausestereoreceptionrequiresastrong antennasignaland
issensitivetomulti-pathdistortion, agoodantennaisneeded
particularlyunderdifficult receivingconditionsand infringe
areas. Readthepreceding sectiononFMantennas.
Dolby*programsfromFMstations
TheDolbyBnoisereductionsystem offersapossibilityto
combatthehighernoiseinFM stereotransmissions.The
system isintheUSAapprovedbyFCC** forFM
broadcasting.
TheDolbyBsystem useaprogram leveldependent
preemphasis. Athighlevelthepreemphasisis25 sec, at
lowerlevelthepreemphasisincreases.Theutilizationofthe
allowedmodulationcantherebybeimproved.The
compatibilityoftheDolbyBsystem withexistingstandards
isconsideredacceptableastheaveragepreemphasisobtained
intheDolbyBencodermatchesthestandarddeemphasis.To
takefull advantageoftheDolbyBnoisereduction, aDolby
Bdecoderunit mustbeusedand thedeemphasisnetworkin
thereceivermustbecorrectedto25 sec.
ForthosewhomayreceiveDolbyBencodedFMbroadcasts
wehavefound aswitchabledeemphasistobeauseful
feature, Thisservestwopurposes. First: Toenabletheuser
toutilize aseparateDolbydecoder, forinstance thedecoder
alreadyincorporatedinTandbergTapeRecorders3600XD,
9200X.Dand 10XD. Second;Toenableadirectre-cording
oftheDolby Bencodedprogram forlaterdecoding when
playedbackthrough thetaperecorder'sDolbycircuits.
PROCEDURE:
WhenreceivinganFMDolbytransmissionandusing a
DolbyBdecoder,theFM 25 uSbuttonmustbe
depressed.Thebuttonmustalsobe
depressedwhenadirectrecordingofaDolbyBtransmission
iswanted***.
WhenreceivinganFMDolbytransmissionwithoutusing a
DolbyBdecoder, theFM25 Sbuttonmustbereleased.
*ThenameDolbyisaregisteredtrademarkofDolby
LaboratoriesInc.
** FCC standsforFederalCommunicationsCommission, theUSA
broadcastingstandardsorganization.
***IfyouareusingaTandbergTapeRecorderwithDolby, setthe
DolbyknoboftherecordertoDOLBYFM.

8
AMAntennas
Ferrite-rod
Foroperationinthebroadcastbandthisreceiverisequipped
withamoveableferrite-rodantenna.Thisantennaisintended
forlocalreceptionwherethesignalstrengthisnormallyfairly
high,butit canunderfavorablereceivingconditionsalsopick
upmoreremotestationsefficiently.Theferrite-rodantennais
highlydirectionalandpicksupthestrongestsignalwhenit is
atrightanglestothetransmitter.Theantennaishingedand
shouldberotatedtothepositiongivingthebestreception.
Thisisalsopossiblewhenthereceiverisplacedonashelf.
Theferrite-rodantennacanneverperfectlyreplaceagood
outdoorantenna.
NOTE! Theantennacircuit isbuilt intotheferrite-rodcasing.
WhenlisteningtoAMyou shouldalwaysmovetheferrite-
rodawayfromtherearpaneltoavoidde-tuning ofthe
antennacircuit. Thisisalsoimportantwhenusing an
outdoorantenna.
Outdoorantenna
Togivethebestresultsanoutdoorantennashouldbeused.
Suspendawire15 to20 meters(50 to60feet)long atthe
highestpossibleelevation. Thebestresultsmayheobtained
byexperimentation.
ConnectafeedertotheterminalmarkedAMANT(socketon
Europeanversion)andifthefeederislong avoidrunningit
too closetowalls.
Ifyou havetheEuropeanversionconnectthe
appropriateplug.
Grounding
ToobtainbestAMreceptiongroundingofthereceiveris
recommended. ConnecttheAMground terminal(A)tothe
nearestwaterpipe.
Thegrounding terminalBisdesignedforFM
coaxialantennacable(U.S. modelonly).
Thegrounding terminalCispreparedforgroundingof
transcriptionunit orrecordplayerchassiseswhenphono
connectorsareused.
Wiring oftheDINconnectorforphonouseisshownon
thebackcover.

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Tuning on AM
SelectAMreceptionbydepressingtheAMbutton. Thered
lightoverthebuttonwill lighttelling you thatthereceiveris
intheAMmode.Usethelargetuning knobontherightside
ofthescaletotuneintherequiredstation.Tunefor
maximumdeflectionontheSIGNALmeter.
NOTE! MakesurethatthePREAMPREC
buttonisreleased.
Volume-Balance
UsetheVOLUMEknob tocontroltheaudiopowerfedtothe
loudspeakers. UsetheBALANCEknobtocontroltherelative
outputlevelsfromthetwospeakerchannels.Atypicaluseforthe
BALANCEcontrolistocompensatefordifferencesinthe
characteristicsorthepositioning ofleftand rightspeakers.
ToneControls
Thisreceiverisequippedwiththree independenttonecontrolsfor
controlling theBASS, 'PREBLEandMIDRANGEaudio
frequencies.Theeffectsthatcanbeachievedwhenthesethree
controlsareusedmaybeseeninthegraphs.
Theknobsarethesplit typewheretheinnerpartoftheknobisfor
therightchannelandtheouterpartoftheknobisfortheleft
channel.
Tonecontrolscanbeusedtoachieveatonepicturethatispleasingto
theindividuallistener.Theycanalsobeusedtocompensateforlack
of"body"inanyparticulartoneregionwithaprogram fromany
source. Afurtherusefortonecontrolsistocompensateforspeakers
and/orroomacousticsthatdonot. givethedesiredtonepicture,
Othercontrolsaffecting thetoneresponseareLOWFILTER,HIGH
FILTER1, HIGH FILTER2
and LOUDNESS (see page11).

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Stereo-mono switching
Stereo-monoswitching intheaudioamplifiersmaybe
performedforradio, disc, ortapeprogramsbymeansofthe
STEREO,MONO L,MONO R,andMONOL+Rmode
buttons.
STEREObuttondepressed-thetwochannelsareseparated
forstereoreproduction.
MONO Lbuttondepressed-theleftchannelprogram isfed
tobothspeakers.
MONO Rbuttondepressed-therightchannelprogram isfed
tobothspeakers.
MONO LandMONO Rbuttonssimultaneously
depressed—thetwochannelsareseparatedforstereo
reproduction, withthechannelscrossedover.Thisisatwo-
fingeredoperationbecauseyou mustpreventthefirstbutton
jumping outwhenyou depress thesecondbutton,
MONO L+Rbuttondepressed—thetwochannelsare
mixedtogetherandfedtobothspeakers(thisisnormalfull
monooperation).
Thediagramsillustratethefivepossibilities.
Use ofPREAMPOUTandMAINAMPIN
sockets
Thefoursocketsontheextreme leftofthebackpanelgive
access tothepre-amplifieroutputsand thepoweramplifier
inputs.
Thesocketsareintendedforconnectionofexternalnetworks
suchasequalizers, echoboxes,andreverberationunits.
NOTE!
FornormalusethesocketsmusthestrappedtogetherwithU
linksasshowninfigure(a).
WhenanexternalnetworkisrequiredbetweenthePREAMP
outputand theMAINAMPinput, removetheUlinksand
connectaccording tofigure(b).
ThePREAMPoutputprovidesapprox. 2voltsatless than
0.1%distortionand hasasource impedanceofapprox.
1kohms.