Kenwood TL-922A User manual

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 TALtNEALRAMP.gLlFlER,,,,,,, INSTRUCTlONMANUAL'KENWOODCORPORATlON8cg/p1R2IN1T1E1DogINgJA1pANB5o-258-4o(K2)(G)

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AFTER uNpAcKING CAUTlO N
ItjsadvisabletosavealIoriginalpackingcartons(innerand Read Operating ManualSection 2 before proceeding to
outer) to protect your valuable Linear Amplifier from unpackandassembleyourampIifier.
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damage should youwishtotransportitforremoteopera- wA RNING !!,
tion orship itforafter-salesservice. !,
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ThefoIlowing explicitdefinitionsapply in thism anual.Be LETHA L VOlTAGES PRESENT.
l,suretoreadthesedefinitions.
NOTE = If disregarded,inconvenience only - no
daMage orperSOnalinjUry. j
CAUTlON = equipment damage m ay occur, but not
personalinjury.
WARNING m personal injury may occur- do not dis-
regard.
CoNTENTS
rL.g22A spEclFlcATIoNs...................3 SECTlON 6 MAINTENANCE .........,......15
Ecrlo N 1 FEAruREs ...................4 6.1 InternalCleaning
sEcr oN 2 pREpARArloN fOR USf .........5 6.2 Replacing Pow erFuses
2.1 Accessor;es 6.3 Replacing Pow erTubes
2,2 lnstallationofPowerTubes 6,4 lnpUt MatChin9CirCUit
2.3 ceneralTipson lnstallation SECTlON 7 TROU BlESHOOTIN G HlNTS .,,... 16
2.q AC pow erSource PA CKING ................................ 17
2.5 Line VoltageChange lNTERNAL PA RT LOCATlONS ..,.,,.,.,.,,,, 18
2.6 pow erCable SCHEMATIC D IAGRAM ..................., 19
2.7 Excìter
2.8 Antenna
2.9 Interconnection
2.g.1 cround;ng
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erCaseCoverAssembly/
2.9.2 Cable Connection Disassembly ,.................... 5
sEcrloN 3 CoNrRoLs AND THElR FUNCTlONS .9 Fig.2-2 CorrectPow erTube Handling ........ 5
3.1 Frontpanel Fig.2-3 Parasìtic SuppressorCoilMounting .... 6
3.2 RearPanel Fig.2-4 lnputVoltage Term inalBoards ....... 7
sEcTIoN 4 opERArloN ........,.........11 fig.2-5 PowerCable ColorCode ............ 8 '
q.1 prechecks Fig.2-6 ExciterConnections forRLand A LC
q.2 CW Operation Controls ........................ 8
q.3 SSB operat;on Fig.2-7 Interconnection oftheTL-922A ...... 8
q,q RTTY Operation Fig.3-1 FrontView ...................... 9
-q.5 Sett;ngtheA LC ADJControI Fig.3-2 RearView ...................... 1O
q.6 Ad;ustingtheRfOutputMeter Fig.5-1 LinearPowerAmplifierCircuit ....... 13
q.7 High-Voltage Transform erProtection Fig.5-2 TransformerPriMarY Current Flow ..... 14
 .8 Carrying YourTL-922A Fi9.5m3 Fan MOtOrDelaY StOp CirCUit ........ 14
sEcrloN 5 c Rculr 0EsCR prlo N ...........13 Fig.5-4 M eterDrive Circuit................ 14
5.1 LinearpowerAmplifjer Fi9.7-1 PaCkín9 fOrShipment .............. 17
5.2 PowerSupply
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7-2,3TOp,BOttOm View S...,,.,......... 18
5.3 FanMotorDeIayStop Circuit
5.Q MeterDrive Circuit 1.frOntPanelCOntrOIS Set-Up .............. 1
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15. 5 SparkSuppressor 2 TUne and LOad InitialSe in9S
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,TL-922A SpECIFICATIO S =--
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Transm it Frequency Range". 160 m through 15m Am ateur Bands
Excitation Energy Required". 80 W nom inal,120 W maximum
Mode and Duty Cycle. SSB,continuousfor30 m inutes.
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CW and RTTY,key own continuousfor1O m inutes.
Rated Platelnput.. 2kW P.E.P.SSB,1kW CW RTTY
PlateVoltage".(athlo signal) 3.1kV SSB,2.2 kV CW RTTY
CircuitType: CIassAB2 grounded grid linearamplifier
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3rd OrderJnterm oduIationDistortion; Below -30dB.
lnputlmpedance". 50 n ,unbalanced atbetterthan 1.5SW R
Outputlm pedance.. 50 to 75 n ,unbalanced.
Cooling". Forced Air.
lnterlock Satety Features; Prim ary high voltagecircuitcut-off.
Secondary high-voltage circuitgrounding.
Therm alProtector; Locks outtransm itrelays ifH.V.pow ertransformeroverheats.
fan MotorDelay StopTime; 140 +- 30 seconds. (atroom temperature)
ALC; Negativegoing,adjustablethreshoId -8V C maximum output(typical).
powerTubesUsed. Eimac3-500Z,tw o pieces
Q m iconductors: ' i
odes,18 pieces
lenerdiode,1 piece
powerRequ;rements.. 120V,28A;240V,1qA;50/60H ;formaximum SSBinput.
Cablegsuppl;ed.. Signalcable (coaxial)withUHF-type connector,1.5m.
Controlcable,1.5m .
Dimensions; 390mm x19Omm X407mm (15-3/8X7-1/2X16'')
Weight.. Net3tkg (68 Ibs.)
Shipping38 kg (83 Ibs.)
Theabovespecificationsare subjecttochangewithoutnoticeduetotechnicalim-
provement.

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sECTIO N 1. FEATU RES =-
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1. The T L-922A is a ClassAB2,grounded grid linear linearity,and the CW Modeforlow powerconsum p-
am plifier developed by Trio-Kenwood through ad- tion and heatgeneration during extended periodsof
vanced high-power technology using tw o high-per- operation. '
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formance Eim ac 3-500l power tubes. lt covers all :
bands 160 m through 15 m forSSB,CW and RTTY 8. linearAmpIification ControlSw itch '
modesofoperation. ThisswitchiscapableofsettingyourT L-922A inthe
straight-through state irrespective of the standby
2. Unprecedented Reliabjli control on the exciter. !
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The T L-922A isdesigned to providestable,high RF
tputpowerrorextended per;odsorcont;nuoususe. 9. VariabIe Threshold Level(ALC Detector) ,
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;neered w;thTr;o_Kenwood,sadvanced c;rcu;tand TheA LC circuitwiIlaccomm odateexciterSof80w
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an;caItechnoIogy,the TL_922A empIoystwo to 120 w (nominal)by varying the ALC threShold
d3_5oozpowertubestothe;rruIIadvantage. I
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evel.This effectively prevents overdriving the final
owertubes, ;m ;t;ng theAm pI;f:erto :tsl:nearrange
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3. low ntermod,lat;onD ;stort;on andgUaranteein9lOW diStOrtiOnatMaXim UM POWef i.
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Intermodulation distortion (lMD) is minimied
throughtheuseofnegativeR.f.feedback. 1O. TwoPanelM etert i
lnadjustingormonitoring yourTL-922A,onemeter
q. Qu;c Turn.on aIwaysindicatesthe(lp)platecurrent;while,with'the
Warm-up isnotnecessary.The3.500Z tubesarefast other,you may read (Ig)grid current,(RF)relative
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heatjng. output,or(HV)highvoltage. Thisfacilitatesease of !'
operation ofyourTL-922A.
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5. FullSafetySystem !!,
Toprotectyouagainstanypossible high voltageelect- 11. RigidMechanicalStructure
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r;c shock,yourTL-922A hasadouble safety system Thedie-castsidepanelseffectiveIysupporttheweight t
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comprised of interlocking switches.One interrupts of the amplifier against shocks and jarring during ,
the high voItage primary circuit w hile the second transportation.Recessed side panelhandles are pro-
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directly grounds the secondary high voltage circuit. vided so the AmpIifiercan be easily carried.
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Also provided arebleederresistorsfordischargingthe
high voltage capacitorsand ''DA NGER''warningsat 12. VernierPlateTuning 0ial
high voltage positions. Please observe allwarnings, The PLATE tune dial is equipped with a reduction :
they are for your protection. gear thatfacilitates easy tuning,particularly forthe '.
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higherbands. ltalso effectively preventsaccidental í'
6. hlewly-0eveIoped fanMotor0elayStopCircuit miss-tuning during operation. Controls and panel '
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To reduce power tube deterioration,yourT L-922A arrangement
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designed to hum an engineering
has a newly-developed fan motor delay-stop circuit standards
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provide superior ease of operation. !
com prised of a thermaldelay relay.The cooling fan
wiIInormally runfor1QO seconds(Typ)afterpower 13. eat,ContemporaryAppearance
is rem oved from the un;t and w iII measurably ex- M echanjcalarrangementand sophisticated design tO
.tended tube life. m atch any Trio-Kenw ood tranSCeiverOrtranSm itter.
YourTL-922A can aIso be used as a high-quality,
7. ModeSwitch forEffic;entLinearOperation generalpurpose Amateurband IinearampIifierWith j
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MODf switching js provided to select between the any excitercapableof80W to 12OW Rf OUtpUt,
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SSB Modefor the maxim um PEPoutputwith good i
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5. spareruse,15AFo5-1533-o5 2p;eces .. ,,,SiITCHPLUNGER
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7. Scr$ws,4 x 12m m long N30-QO12-46 2 pieces 3,m F,A,
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8. Platgcap F02-0407-04 2 pieces sELF-TAppN, \ ' \'\\ g l - '
g. paras;t;csuppr$ssor ;I,,;ghih,nd 1p;ece scREw (4pcs) '
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below. Prepare the following mounting \"\? /
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hardware and iools. ,'
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re^,3x6mm long 4pieces
Ptainwasher 4 pieces
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Spring^asher Q pieces !
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Phillipsscrewdriver 1piece i \ \S
mallstandard screwdriver lpiece
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NOTE. A partstray to preventlossofm etric hardware is ,
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WARNlNG.Betoreproceeding,makesurethat. )!i'!'ii,iiI!!,rhgpow0rc$bl0;sNoTplugg0d;nth0w8llout- \ 11
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l$t.Th0METERswitchis$tth0HVposition ',
8nd th0 m ultím $t$r r0$ds OV.
Proceed asfollows. (Referto Fig.2-1) h???
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1. Remove the four4 m m Phillips scre^sholding the
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upper case cover.
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2. Removetheuppercasecover. .
ph.iI.
Figur0 2-2 - 0 rre Po
R'MOV' !h' tOUr 3 ? M S'l!-"PP'n9 ' !P'SCr'^S ru Handl;n
and fOU,fl,theadSelf-t,ppin9 PhillipSSCrewShOldin9
theinsideshield onthepowertubeenclosure.

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CAUTIO N TubelnstallationCheckout
part;cular care should be taken not to strike and 1. To avoid daM age neCeSSitating tUbe reptaCeMent,
break the glasstubesduringinstallation.Tube break- pleaSeCheCk;
ageduetonegligenceisnotw arrant a. Powertubes are freefrOM SCratCheSorOthef
physicaldefects
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efertoFig.2-3)TeMpOrarilyfiXeaChparaSitiCSUp- b i b r I, .' d. , .
rco;,onthe piate capw ;ththe,etter,,R,,or,,L,, U ''ar' U Y '?S'r'' 'n'O ' ''r'O'k'''
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Oup Att,,st,, e donott,g,te,,,eq , , s,rew C PlateCaPSCreW St'l9htenedSeCUfeIYt
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adjusted. wCO,S
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8. mount,,ep,a,ecap w;th paras;t;csuppressorcoiton ' "' 'r','Cr'w', f'V'r''n 'nY O' 'rU'n''''- i
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ach ,ube observ;ng the r;ghthand and ,erthand co:, S'rY Ma''f'''iSnO'''!'i?Sid''h'U?i'
2 Referto Fig 2-1 Theinsideshield plate includesthe
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esignationslfthescrewhoIeSdonOtali9n,Shape ' '' ,' highvoltagesecondaryprotectionswitchplunger(a,theCoiIbySli9htbe'din9OreXtendiD9byhandfOr bakelitebar)PositiontheplatesothatthepIungerwipreciseinstallation,keepingtheCoilbeIOWtheteVel 'securelyengagethespringplateforungroundingthel
of the pIate cap. , h.
cAuTloN..pait;cularcare shouId beexerc:sed Jn not
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apply;ngexcess;veforceto thetubes. l?S"
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g. careru,iyi;ghien,hescrewsa,eachendortheco:, i';'.'d'PPr;XiM,a,";.,M~,n'O'.'rO?'P'Ç',.'P
whileholdingtheplatecap by hand. .'S
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screwdriver. en9a9e eM ICrOSW 'C '
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11, CheCk to assure correct installation by reference to
F:g.3-3. 2-
Installin a dry, well-ventilated area,shaded from direct
Sun light. Your TL-922A m ust h8v$ 8 m inim um
clearanc$ oF15 cm to th$ r$8rto 8IIow hot8ir8t50 to
70^C to exh$ust. ,
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; Choose an operating position capable ofsafely supporting
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Be
EfOre 'l?Stallat'lO?,CheCk eaCh PafaS'lt'ICSUPPfeSSOrCO'llfOr
,,e ,e.,ght or the TL.g22A (31 kg),pIus a,,,he o,he,
good alignmenttopreventthe application ofexcessiveforce
tothetubes. station eaUipm ent.
2; Letters''R''and ''L''onthecoiIsshouIdfaceup. . . T, d ,
3.Temporar;Iy ;nstaIIeachco;Ion the;rpIatecapsbeforet;naI LeVelyOUrTL922A InOperatlOn. eheate eeCtrOdeSin i
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tightening. Use# Philipsscrewdriver. each powertube willbe distorted by gravity resultingin
shortened service life,ifslanted beyond 100.
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aspRINc wAsHER 2.q Ac pOW ER SOU RCE
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F,ATwAsHER USe an AC PoWer line haVi?9 SUffiCientCUfrent CaPaCitY
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or the performance of your TL-922A will be adversely
IiI11l!, ! ii,'I'IIllll arrec,ed by ;nadequateI;neregu,at;on. In,hewors,Case,
do no, devía,e ,ore than +_1OO/o froM the rated input
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?/ hmm? ?? TheinpUtVoltageCanbeChan9edtOeither240VOr120VaS
II -_.__. requ;red,bychang;ngt,epowertransrormer:nput,:nks ,.,,
ocated in the ducton the rearpanel. '
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NOTE; TheTL.922A w asfactorysetinthe 240V position. !
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figur$ 2-3 - P$r8sitic Suppr$ssor CoilM ountin9
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ExcITER  qToomTGoARR2EoqoLuA/N1y20ov+L1D,oNcoEvTo,hangelinkpositions,removetheaccess,overbytheTrio-Kenwood'stransceiversSeriesTS-930,TS-940,twoblacksnapfasteners.loosenthescrewsholdingtheTS-830,TS-820,TS-530,TS-520,TS-430,TS-440S,shortin;bars,afewturnsonly.(0onotloosenexcessivelyTS-180,TS-130,TS-t20andTS-900andtransmittersastheycoulddropintotheAmplifier.)DraweachshortingSeriesTX/T-599areallsuitabteexcitersandwillmatchbarupwardforremoval.ReplacetheshortingbarsforthetheTL-922Aindesignaswellasappearance.Operatin9VOlta9edeSiredaSilIUStratedinFi9.2-4.Ti9htenorE..whentheTsqqos;sused,themod;r;c,t;on;sne_firmly.Also,besuretotightenthescrewsfromwhichthecess,.ShOin9barSwerereMOVed. Rerertorsqqos;nstruct;onm,nu,I.hlOTE..FusesneednotbechangedincúrrentratingwhentheinPutvolta9eiSchan9ed.2.gANTENNACAUTlOExCeSSfOrCeMaYbreaktheterminalStriP.yourTL_g22A,eq,;,esa,a,,,,,,h,v;,ga5oto75nimpedanceandprovidingitis.2T.h6POWERCAlE (1)Ratedfor2kWp.E.p.inputpower,edw,thyourTL_g22Ah,snopIug(2)and,exhibitalowanding-waveratio(SWR),tsDOeW,'df.'acbol',,SUe,PtPlapIugm,t;,gw;ththewaIo,tIet.DesiredSWRis1.5to1.orIess.AhigherSWR,2OfaTthebueandbrownIeadsa,epower,thegreenIeadground3tOl,MaYCauSediftiCUltrnatChin9WithYOUrTL-as,IIust,a,ed;,F,gu,e2_5. 922A.ExCeSSiveSWRCouldmeltthecoaxialcable
and antenna. To protect your TL-922A against
adverseSW R effects,usean antennatuner. Notethat
feeder radiation due to m ism atching willcause TV l,
An HF AmateUrband SSB OrCW tranSm itterOrtranSCeiVer BCI
,
orsj, ;lar RfI.
having anRFoutputim pedanceof5O© andoutputpowerof
80W to 120W is sutficientto drive the TL-922A. Exciter
output exceeding 120W w illcause overdrive,resulting in
sho ened pow ertube lite anddistorted output.To lim itthe BLACK
pow erlevelabove 120W ,use anexciterhaving an external
ALc ;nputterm ;naI. W HlTE
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 GREENCAuTION.BESURETOTIGHTENALLSP''''hO"'n9b'''LoosENEDscREws.F;g,,g2.5-powgrcgblgcoIo,codga'eteCU'ed'tterminaIS3'ndQ.use#ph;I;psscrewdr;ver.a.240Vsettingg'!oo'o?i'2sq5678ExC,TERTL-g22Ao;!.!,-!TRANsM,T!iRLCONTROL!ib.11ovsettingR,,,,,E,,,,!!!!!,,,g''ogTCOIRACULCT!!ALCCONTROL!!!ALCiO-20l2St5678,, ,Figurg2-6Figurg2-4-InputVolt8ggT$rminglBo8rdsfcit0rConionIforRLaALC0mrolI.

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2.g INTERcoNNEcTIoN (The ALC output atno signalinDutis
2.g.1GRou ING normallypositivewhen notconnectedto
conneci ihe GN0 posts of the TL-922A and theexciter.)
exciter to prevent posSibIe eleCtriC ShOCk and TheRL,
orst,ndby control,;n theexc;termustbe .
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RFl. The Wire USed ShOUld be aS thiCk and sw;tched tog,ou,d ;,t,ansm;tmode,
as;II,strated
shortaspossibleand runto agood earth9roUnd. ;n F;gure 2_6.
2.9.2 CABLE CONNECTlON NorE,
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use Rc_g/u, Rc.11/u or heav;er as
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Interconnect yourTL-922A and exciterw ith the ,
,te,,,c,bIe
supplied cables as illustrated in Figure 2-7. '
NOTE; If an SW R meteris COnneCted betWeen !i
NorE. Ir you use an exc:ter ot anotherbrand, ihe iL.g22A a,diheexc;ier,iotaIco- t
replace the supplied conneCtOr With One ax;alcab e engih mustnotexceed 1.7 m.
appropriatetoyourexciter.Theeciter j
used m ustacceptthe negative-goingA LC t
voltagefrom theTL-922A. '
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T ?,JJJ,.,J,JJ,.,JJJJ,.,JJJJ,.tJJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.JJJJ,.JJJJ,.,JJJJ,.tJJJJ,.,JJJJ,.JJJJ,.JJJJ,.JJJJ,JJJJ,JJJJ,tJJJJ,.lJJJJ,IlJJJJ,lllll,lJlll,llllI,.llIll,lIlIJ,lllll,lJlll,lJllI,lllll,llJllIIlllll,'llIll,'lJlll,'llllll'lllll,'lllIl,'lllJl,'lllll!----.sEcTlo3coTRoLsADTHElRFucTlOhlS'-_--_-'-''i,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.JJJJ,.,JJJJ,.,IJJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,.,JJJJ,JJJJ,,JJJJ,lJJJJ,lJJJJ,tJJJJ,.lJJJJ,IlllllI.lllll,t,tllIll,tlIllIlllll,llJllIlllll,lllll,lllll,tllllll'lllJl,'llIlJl'llJll,'lllJl,'llJlJ,'q11215316
7 8T
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Figurg 3-1 Front P8n$IVi$w
3.1 fRONT PAN EL
1. IPM eter 9. M ETER Switch
The lp meterreadstheplatecurrentflowingthrough SelectsIg(gridcurrent).RF(relativepoweroutput),or
thepowertubes. HV (plate voltage).
2. O A lR lndicator 1O. BAhl0 Selector
The ON AlR indicator lightsup in the on-the-air, Set for the Amateur band in w hich operation is
ortransmit MODE. desired.
3. PLATE TuningControl 11. LIhlEAR Switch
Thiscontrolperm itsyou to tune theplatecirCUitto ln the STBY position
,
the exciter runs straight
thedeSiredtranSM itfre nm ,and iSeaUipped w ith a through.ln the O pERATE position, the Am plifier
redUctiongearforeaSy tUnin9. autoM atically kevsw iththeexciter
.
4. M ultimeter
The Multimetercan read the lg (grid current),RF
(relative power output), or HV (plate voltage)as
.
selected bv the M ETER switch.
5. STBY lndicator
W ith the unit turned on,shows unkeyed or receive
state.
6. lOA0 Control
lmpedancem atchesthepinetworktotheantenna.
7. POW ER Switch
A double pole sw itch com pletely disconnectstheAC
inputtrom thetransformers.
8. MO 0E Switch
t for SSB orCW.For RTTY operation,setthe
switchtotheCW position.
9

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Ti'.r''''''T'''''d'^T,!g'''gp''''.T'''',,..,,,,,..,,,,,,,r.,,',''''', '!,,
5 6 7 1o 8 9 11 12
Figur$ 3-2 R$8rP8n$lVi$w
3.2 REAR PAN EL
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1. Cooling fan 8. RF lNPUT Connector
TheCoolingFancoolsthepoWertubesandeffectively ThisUHf-typeconnectorinputstheRFsignalfed
keeps the insíde tem perature from increasing. Be from theexciter
.Usethesupplied ,abIe.
carefulofhotair(500to700C}attheexhaustPort. g.RFourpuT Co,,e,tor ..,
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2. LineVoltageChangeTerm inals This U Hf-type connector feedsthe RF output to
These term inals are tocated behind the rear cover, the antenna.
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WhiCh iS reMOVed bY PUllin9 the tWO SnaP faStenefS. 1o.cN post
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FOfinPUtVOlta9eChan9e,PleaSerefertOSeCtiOn 2.5 use th;spostto ground the TL_g22A to yourexc;ter '
3. SerialNo.Plate and station ground.
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ThiSPlate iSStaM Ped W ith the SefialNUM berOfYOUr 11
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FusEHoIde,s(2} '''';
TL-922A, E,,hco,t,;nsa 15A ruse.
Ire;the,o,both r,sesa,e !.,
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4. RF M ETER Control blow n,determ inethecause beforerepJacement. '''
Thiscontrolisused to calibratetheRf outDutread- 12 pow ER cabIe ''!
.
ing.Forcatibration,seeSection 4.6. '
Ac pow er,.ssuppl,.ed to the ampI,.F,.erby, three_w .,re '.
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5. ALC A DJCOntrOl cabIe.
(See section2.6) '''
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Thiscontrolisused to adjusttheALC voltage.for ,.'"
adjustment,seeSection4.5. '',,
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6. ALC OUT Jack '
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ThisjackfeedstheALCvoltageout.
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7. RL CONT Jack
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