Ten Tec 68FTT416 Amplifier User Manual

Ten Tec Inc Amplifier Users Manual

Contents

Users Manual

♦ TABLE OF CONTENTSTABLE OF CONTENTSLIST OF ILLUSTRATIONSSPECIFICATIONSWARNING NOTICES10 M OPERATIONINTRODUCTIONUNPACKINGi – iiiii – ivv – viviiviiiviiiviiii1. INSTALLATION1.1 INTRODUCTION1.2 ELECTRICAL CONNECTION S1.3 TRANSCEIVER INTERCONNECTIONS1.4 ANTENNA REQUIREMENTS1.5 GROUND CONNECTION1.6 HIGH POWER OPERATION1.7 ALC1-11-11-11-11-11-11-22. OPERATING INSTRUCTIONS2.1 INTRODUCTION2.2 FRONT PANEL CONTROL FUNCTIONS AND INDICATOR 2.2.1 BAND SWITCH 2.2.2 TUNE 2.2.3 LOAD 2.2.4 POWER 2.2.5 OPR-STBY 2.2.6 QSK-PTT 2.2.7 MULTI-METER SWITCH 2.2.7.a EP 2.2.7.b IS 2.2.7.c FWD 2.2.7.d REV 2.2.8 OVERDRIVE 2.2.9 WAIT. 2.2.10 PEAK METER 2.3 REAR PANEL CONNECTIONS AND CONTROLS 2.3.1 TRANSCEIVER 2.3.2 ANTENNA 2 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 12 - 22 - 22 - 22 - 32 - 32 - 3
ii 2.3.3 KEY IN 2.3.4 KEY OUT 2.3.5 PTT – VOX 2.3.6 ALC 2.3.7 ALC CONTROL 2.3.8 A.C. LINE 2.3.9 LINE FUSE 2.4 INITIAL POWER – UP 2.5 TUNE – UP PROCEDURE 2.5.1 CHECKS TO MAKE BEFORE TUNING UP 2.5.2 IMPORTANT POINTS TO REMEMBER 2.5.3 SUGGESTED TUNE – UP PROOPERATING HINTS 3.1 INTRODUCTION 3.1.1 TUBES 3.1.2 INTERLOCKS 3.1.3 FUSES 3.1.4 TRANSFORMER RATINGS 3.1.5 AMPLIFIER CONTROL FROM TRANSCEIVER 3.1.6 120 VAC OPERATION4. TROUBLESHOOTING 4.1 INTRODUCTION 4.2 MAINTENANCE5. CIRCUIT DESCRIPTIONS AND ILLUSTRATIONS 5.1 INTRODUCTION 5.2 INPUT MATCHING BOARD (81811) 5.3 15 M INPUT FILTER (81550) 5.4 POWER AMPLIFIER TUBES 5.5 HIGH VOLTAGE POWER SUPPLY BOARD (81809) 5.6 SCREEN SUPPLY AND GRID BIAS BOARD (81815) 5.7 QSK BOARD (81814) 5.8 SWR BOARD (81816) 5.9 PLATE BOARD (81813) 5.10 METER SWITCH BOARD (81812) 5.11 AC LINE DELAY BOARD (818102 - 32 - 32 - 32 - 32 - 32 - 32 - 32 - 42 - 42 - 42 - 42 - 43 - 13 - 13 - 13 - 13 - 13 - 13 - 24 - 14 - 15 - 15 - 45 - 15 - 15 - 55 - 75 - 95 - 115 - 135 - 145 - 16
iiiLIST OF ILLUSTRATIONS1 - 1 T/R CONNECTIONS FOR TEN-TEC TRANSCEIVERS WITH TX OUT AND TX EN1 - 2 T/R CONNECTIONS FOR OTHER TRANSCEIVERS2 - 1 MODEL 416 FRONT PANEL2 - 2 MODEL 416 REAR PANEL2 - 3 MODEL 416 TOP VIEW2 - 4 MODEL 416 TUNING CHART2 - 5 MODEL 416 TUNING LOG3 - 1 120 VAC OPERATION4 - 1 TROUBLESHOOTING HINTS5 - 1 MODEL 416 MAIN WIRING DIAGRAM 81811 INPUT MATCHING BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81809 H.V. POWER SUPPLY BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81815 SCREEN SUPPLY AND GRID BIAS BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81814 QSK BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81816 SWR BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC1 - 31 - 32 - 52 - 62 - 72 - 82 - 93 - 34 - 15 - 25 - 45 - 45 - 45 - 45 - 65 - 65 - 65 - 65 - 85 - 85 - 85 - 85 - 105 - 105 - 105 - 105 - 125 - 125 - 125 - 12
iv 81813 PLATE BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81812 METER SWITCH BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81810 AC LINE DELAY BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC 81808 LOAD SHUNT BOARD PHOTO CIRCUIT TRACE COMPONENT LAYOUT SCHEMATIC5 - 135 - 135 - 135 - 135 - 155 - 155 - 155 - 155 - 165 - 165 - 165 - 165 - 175 - 175 - 175 - 17
v SPECIFICATIONSBAND COVERAGEPOWER OUTPUTDRIVING POWERDUTY CYCLEEFFICIENCYINPUT AND OUTPUTIMPEDANCE’SHARMONICSFULLY BREAK-IN QSKPROTECTIVE CIRCUITSPRIMARY POWERLINE PROTECTION160, 80,40, 20, 17 AND 15 meters1500 WATTS SSB AND CW , 1000 WATTSCONTINUOUS , RTTY , AND SSTV70 WATTS TYPICAL FOR 1500 WATTS OUTA.) SSB-CONTINUOUS VOICE MODULATION 1500 WATTS PEPB.) CW-50% DUTY CYCLE CONTINUOUSLY 1500 WATTS PEP 30 MIN. KEY DOWN @1500 WATTS61.7% MEASURED @ 40 METERSUP TO 65% DEPENDING ON BAND,FREQUENCY, LINE VOLTAGE , AND LOAD50 OHMS UNBALANCED WITH VSWR <2:1MEETS OR EXCEEDS FCC REQUIREMENTSBETTER THAN FUNDAMENTAL -45dBBUILT IN T/R SWITCHING GUARANTEEDCLOSURE <7mSOPEN ~ 15mSA.) SCREEN GRID CURRENT REGULATION OVER VOLTAGE PROTECTION AND MOV ARC OVER PROTECTION LED OVERDRIVE INDICATIONB.) CONTROL GRID CURRENT REGULATION, OVERDRIVE TRIP , AND LED INDICATIONC.) PLATE CURRENT TRIP AT 1.6 AMP SERIES RESISTOR FOR ARC ABSORPTION240 VAC @ 20 AMPS 50/60 Hz -10%+5%PRIMARY LINE FUSES, INTERLOCK, ANDSTEP START INRUSH PROTECTION
viTUBECOOLINGMETERINGSTATUS INDICATORSPLATE VOLTAGESUPPLYSCREEN SUPPLYCONSTRUCTIONSIZEWEIGHTSVETLANA CERAMIC 4CX1600B POWERTETRODEDUCT FORCED AIR , VERTICAL EXHAUST ,USING CENTRIFUGAL BLOWER TO PRODUCE.50 " PRESSURE DROP IN WATER AT SEA LEVEL25 DEG C AIR TEMPERATURE. OPTIONAL FANAVAILABLE FOR HIGH ALTITUDE ORCONTINUOUS DUTY.FULL TIME PLATE CURRENT METERSWITCH SELECTABLE Ep,Is,FWD, AND REVPOWERPEAK FDW POWER INDICATED ON FULLTIME BARGRAPHPOWER ON , WAIT, STANDBY , OPERATE ,SCREEN GRID OVERDRIVE, CONTINUOUS GRIDCURRENT OVERDRIVESTEP-START INRUSH PROTECTED 3000 VDC @NO LOAD 2700 VDC @ FULL LOADCURRENT TRIP @ 1.4 AMPS6 AMP 1000 PIV DIODES IN FULLWAVECONFIGURATION FILTERED BY 9 EACH400 VDC 220 uF ELECTROLYTIC CAPACITORS10 OHM ARC ABSORPTION RESISTOR300 VDC CURRENT REGULATED TO MIN +23 mA OVER CURRENT TRIP SENSEALUMINUM .125" TRANSFORMER AND TANKCHASSIS. ALUMINUM .062 CONTROL CHASSISAND COVERSH x W x D = 8.2" X 17" X 19"65 LB.143.33 KG
viiWARNING!!!!!!!This amplifier contains lethal voltages when operating.DO NOT operate this amplifier with the covers removed.The power supply circuits in this amplifier produce 3000VOLTS which is LETHAL!!!CAUTION!!!Never attempt to operate the TITAN II without firstconnecting a suitable antenna or 50 ohm dummy load ofsufficient power rating or SERIOUS DAMAGE MAYRESULT!TEN METER OPERATION OF THE TITAN II AMPLIFIERFCC rules permit licensed amateurs to modify their own amplifiers for operationin the 28 - 29.7 MHz band. If you enclose a copy of your valid amateur radiolicense with the warranty registration card for your new amplifier , appropriateinformation and an optional input matching circuit will be sent to you withoutcharge.
viiiINTRODUCTIONThe TITAN II Model 416 is an advanced design linear amplifier using a single4CX1600B high power tetrode in a grid driven configuration. This amplifieruses a ducted forced air cooling system and operates easily at 1500 WATTSoutput with maximum efficiency of 65% . Two panel meters provide system monitoring. One meter dedicated to full timeplate current measurement. The other meter is switchable from plate voltage,screen current, forward power, or reflected power.Two front panel leds indicate overdrive conditions in the control grid andscreen grid circuits are about to be reached.Band coverage includes 160, 80, 40, 30, 20, and 17 meters as shipped from thefactory. With proof of authorization, 12 and 10 meters may be enabled withoptional matching network from TEN-TEC.Primary power of 240 VAC is recommended. Operation on 110 VAC ispossible with modification to the line input AC board. However, REDUCEDOUTPUT POWER is necessary. Remember 1500 WATTS output @240 VACline =20 amps. 1500 WATTS @ 110 VAC = 40 amps. No home line circuitsare capable of 40 amp service. The primary AC lines are fused at 20 AMPS.MBD-20A or equivalent must be used in replacement to protect the tube.Interlocks in the primary line and high voltage line are provided to ensureoperator safety. NEVER DEFEAT THESE SAFETY PRECAUTIONS!!!!
ixUNPACKINGCarefully remove the amplifier from the packing carton and inspect it for signs of damage. Ifthe amplifier has been damaged, notify the delivering carrier immediately, stating the fullextent of the damage. Save all damaged cartons and packing material. Liability for anyshipping damage rests with the carrier.Complete the warranty registration form and mail to TEN-TEC immediately. Save thepacking material for re-use in the event that moving, storage, or reshipment is necessary.Shipment of your TITAN II in other than factory packing material may result in damage.This is not covered under TEN-TEC warranty.The following hardware and accessories are packed with your TITAN II. Make sure youhave not overlooked anything.2 ea. 20 AMP ABS-20 fuses 270382 ea. 4 AMP MDA-4 fuses 270151 ea. .056 allen wrench 380401 ea. .062 allen wrench 380881 ea. # 8 allen wrench 38124If any of the above are missing, contact the repair department at TEN-TEC for replacement.Repair dept. (423) 428-0364Switchboard (423) 453-7172FAX (423) 428-4483E-mail TSALVETTI@TENTEC.COMBefore powering up your TITAN II , visually inspect the unit for possible physical damage,such as dents or parts jarred loose during shipment. Cover removal should not be necessary.If however, you do remove the top , remember the interlocks on both line and high voltageprevent power up. Replace the top cover securely before line voltage is applied to theTITAN II.
1-1 CHAPTER 1INSTALLATION1.1 INTRODUCTION: When setting upthe station, provide adequate ventilation forthe amplifier. Also, select a location thatallows comfortable access to the frontcontrols and adequate clearance for rearpanel connections.1.2 ELECTRICAL CONNECTIONS :The TITAN II amplifier draws up to 18AMPS at 240 VAC. Care should be takennot to overload house wiring circuits usuallyfused or breakered at 15 to 20 AMPS.A straight run circuit with # 10 / 2 withground and breaker or fuses at 20 AMPS isstrongly advised.1.3 TRANSCEIVERINTERCONNECTIONS : When using theTITAN II with TEN-TEC transceivers withTXEN-TXOUT connections, follow thediagram in figure 1-1. The QSK-PTT switchon the TITAN II should be in the QSKposition for all modes of operation. Thishook-up arrangement will work with theOMNI series V, VI , and VI+ as well as thePARAGON I and II.When connecting the TITAN II with otherrigs, use the diagram in figure 1-2. Note thatthe key or keyer must be connected to thekey in jack on the TITAN II, and the linefrom the external T/R N.O. relay contacts onthe transceiver must be connected to thePTT/QSK jack on the TITAN II. Whenusing this configuration, the QSK/PTTswitch on the amplifier must be in the QSKposition for CW, and in the PTT position forSSB.1.4 ANTENNA REQUIREMENTS :The TITAN II amplifier is designed for usewith antennas resonant at the frequency ofoperation and having impedances within thelimits of 25 to 100 OHMS or an SWR of 2:1or less. Note that other than 1:1 impedanceswill result in TUNE and LOAD settingdifferent from those in the reference chart(figure 2-7).The nominal output impedance of theamplifier is 50 OHMS. Many antennasexhibit an SWRof more than 2:1 in some part of the band.For operation under these conditions , werecommend using an antenna matchingnetwork that will enable the TITAN II towork into a 50 OHM load for maximumpower transfer to the antenna. TEN-TECmodels 253,229 or 238 are suitablecompanion tuners.CAUTION!!!Never attempt to operate the TITAN II without first connecting a suitableantenna or 50 OHM resistive load of sufficient power rating orSERIOUS DAMAGE MAY RESULT!
1-21.5 GROUND CONNECTIONS : In theinterest of personal safety an to reduce thepossibility of stray RF pickup oninterconnecting cables, all station equipmentshould be well grounded to earth and tosupply line ground bus. It is important tostrap all equipment chassis together withshort heavy leads. This ground bus may thenbe tied to an external earth grounding rod. 1.6 HIGH POWER OPERATION : TheTITAN II amplifier operates verycomfortably at a maximum of 1500WATTS output. The problem is that othercomponents in your station may not. Beforeoperating at this power level , be certain tocheck the following items :1. The coax from the TITAN II to thefeed point of your antenna must betop quality RG- 8X or better. Werecommend silver plated connectorsrather than chrome platedconnectors. Make sure that all coaxconnectors are tight(snug them upwith a pair of pliers).2. All coax switches or relays in the feedline must be rated at 1500 WATTS orhigher. NEVER ACTIVATE IN-LINE SWITCHES WHILETRANSMITTING.3. Verify that the components in yourantennas are rated for the TITAN IImaximum power levels (dipolecenter insulator, end insulators,balluns , traps , etc.). Make sure thatall radiating sections are well clear ofmetallic objects such as rain guttersand antenna supporting structures. For the first few hours of operation ,check the SWR frequently. Anyincrease in reflected power is anindication that something betweenthe amplifier and the antennaelements ,including the endinsulators, is heating and must becorrected.4. A solid earth ground is essential.Every station will have a uniqueelectrical ground due to location ofequipment , distance between units ,distance from house wiring groundrod , distance from RF ground rodetc. The only common theme shouldbe to keep equipment ground strapsas short and thick as possible and RFground rod as close to the station aspossible.5. If you use an antenna tuner , makeall SWR/matching adjustments withthe TITAN II in the STANDBYmode and use transceiver low poweronly.6. If any of your home entertainmentelectronic devices have RF leaks ,the TITAN II will find them. Theproblem will develop because offundamental overloading , rather thanfrom spurious emissions orharmonics. If you are not familiarwith the standard procedure forcontrolling this type of interference ,consult the ARRL Radio FrequencyInterference Manual.1.7 ALC : Today , most solid statetransceivers provide no connection for ALCinput and it is entirely unnecessary to makeany external ALC connection to these rigs.The ALC output jack is used primarily withtube-type transmitter/transceivers with anegative going ALC system. The ALCADJUST control is used to set the thresholdfor proper ALC action. This is -1 to -15VDC depending on input RF drive level.This negative level will be present at theALC jack even when the TITAN II is in theSTANDBY mode or power off.
2-1TEN-TECTRANS. TITAN IITX OUT KEY INTX EN KEY OUTANTENNA TRANSCEIVERFIGURE 1 - 1 T/R CONNECTIONS FOR TEN-TECTRANSCEIVERS WITH TX OUT & TX ENOTHER TRANS. TITAN IIKEY KEY OUTEXT. T/R N.O. RELAY PTT/VOXANTENNA TRANSCEIVERFIGURE 1 - 2 T/R CONNECTIONS FOR OTHER TRANSCEIVERSTITAN II OMNI VITITAN II OTHER RIGCW KEYER
2-1CHAPTER 2OPERATING INSTRUCTIONS2.1 INTRODUCTION : The followinginstructions will enable the operator toquickly place the TITAN II in operation.included are descriptions of the front panelcontrols and rear panel connections.Followed by a detailed tune-up procedure.Refer to Chapter 3 for further informationand operating hints.2.2 FRONT PANEL CONTROLS :The front panel controls and theirfunctions are described below.2.2.1 BAND SWITCH : This switchselects the desired frequency of operation.This is a six position switch that covers the160 meter to 10 meter bands. NOTE ; Abuilt in switch stop prevents operation inthe 10 and 12 meter bands. For 10 and 12meter operation you must contact thefactory for an authorized modification kit.2.2.2 TUNE : This control adjustsvariable capacitor C1 to provide resonanceat the operating frequency. Figure 2-4(page 2-8) shows the approximate settingsfor both the TUNE and LOAD controlson each band. Keep in mind that thesettings in this chart are for operation intoan ideal 50 OHM load. On page 2-8 thereis a blank log chart that you may use torecord the actual control settings for yourantennas.2.2.3 LOAD : This control adjustsvariable capacitor C2 for the properamplifier output loading. See the chart onpage 2-8.2.2.4 POWER : This switch routes theAC line to the primary of the low voltagesupply. When on , the TITAN II willpower up and the indicator light in theswitch will light.2.2.5 OPR/STBY : This switch , when inthe OPERATE position , places theamplifier online. When in the STBYposition , the amplifier is bypassed andonly the transceiver power is routed to theantenna. When in the operate position theindicator light in the switch will light.2.2.6 QSK/PTT : This switch , when inthe QSK position , configures the keycircuits for CW/QSK operation. For latemodel TEN-TEC transceivers with TXENand TX OUT , this position is used for allmodes of keying. When in the PTTposition , the key circuits are configuredfor voice operation with other than TEN-TEC transceivers.2.2.7 MULTIMETER SWITCH : Thisswitch connects the right hand meter tovarious monitoring sites in the amplifier.A. Plate voltage Ep - When in thisposition the meter reads platevoltage. This voltage is line voltagedependant at the ratio of 10 V plateper 1 V line. Plate voltage is set to3000 VDC at a line voltage of 240VAC. Therefore at a line voltage of250 VAC the meter will be a littlehigher (3100 VDC). Since thevoltage is not critical , the meter ismarked with a general area (box) ofoperation. As long as plate voltage issomewhere in or over this box , theTITAN II is happy.B. Screen current Is - When in thisposition , the meter is paralleledwith a resistor in series with thescreen supply. This monitors screengrid current. The upper limit forscreen current is 75Ma. Alwaysoperate below 75 Ma of screen gridcurrent. In addition to the analogmeter, the screen overdrive LEDindicates excessive screen current.C. Forward power - When in thisposition , the meter is connected to
2-2a bridge circuit at the antennaoutput. This measures forwardoutput RF power. It is, however,more load dependant than anexternal watt meter such as a Bird.If your antenna is far from resonance, the accuracy is not as good andpower measurements should bemade externally.D. Reflected power REV- When in thisposition, the meter is connected tothe other port of the bridge at theantenna output. The meter readsreflected power (500 WATTS fullscale).2.2.8 OVERDRIVE : These two LEDsindicate grid overdrive conditions.A. When the screen overdrive LED is lit,the screen current is approaching or haspassed its limit. Reduce drive from thetransceiver immediately and retune.B. When the control grid overdrive LEDis lit, the control grid current isapproaching or has passed its limit.Reduce drive from the transceiverimmediately and retune.2.2.9 WAIT : This LED indicates a 3minutes warm-up period for the tube atinitial power up. After being turned on for3 minutes, the wait LED goes out and theTITAN II can be placed in the operatemode.2.2.10 PEAK POWER BARGRAPH :This meter is connected to the bridge atthe antenna output through an emitterfollowerto monitor peak RF output power. Whenthe red LED is lit, 1500 WATTS has beenreached.2.3 REAR PANEL CONNECTIONSAND CONTROLS : The rear panelconnections and their functions aredescribed below.2.3.1 TRANSCEIVER : This is a standardSO-239 receptacle designed for a matingPL-259 plug. RG-58U or similar 50 OHMcoax is required to connect the TITAN IIto the transceiver.2.3.2 ANTENNA : This is a standard SO-239 receptacle designed for a mating PL-259 plug. RG-8X or similar 50 OHM coaxrated for 1500 WATTS is required forconnecting to the antenna.2.3.3 KEY IN : This jack is the input forthe TITAN II transmit/receive relaysystem. When used with all late modelTEN-TEC transceivers, this jack isconnected to the TX OUT connector onthe transceiver. When used with othertransceivers, a key or keyer is pluggedinto this jack for CW operation.2.3.4 KEY OUT : This jack is a protectedoutput from the TITAN II which passesthe key in to the transceiver after all relaysin the TITAN II have closed and it isready to transmit. When used with all latemodel TEN-TEC transceivers , this jack isconnected to the TX EN on thetransceiver. When used with othertransceivers, this jack is connected to thetransceiver key input jack.2.3.5 PTT/VOX : This jack is an input tothe TITAN II transmit/receive relaycircuits. When used with late model TEN-TEC transceivers, this jack is not used.When used with other transceivers, thisjack is connected to the N.O. contacts ofthe relay key out jack of the transceiver.2.3.6 ALC : This jack provides a negativegoing ALC voltage , used primarily withtube type transceivers.2.3.7 ALC CONTROL : This controladjusts the ALC voltage fromapproximately -1 to -15 VDCdepending on RF input from thetransceiver.2.3.8 AC LINE : This cable is connectedto a standard 240 VAC. Be sure the lineused to power the TITAN II is capable ofsupplying 20 AMPS of current at 240VAC, and that it is protected by either
2-2fuses or circuit breakers of 20 AMPS. wiresize of the AC feed line should be at least10/2 with groundor larger.2.3.9 LINE FUSES : Primary line fuses(ABS-20) are accessible through thesepanel fuse holders. Replace with ABS-20or comparable fuses only.2.4 INITIAL TURN-ON : Thefollowing steps should be followed whenturning on your TITAN II.A. Set multimeter switch to the Epplate voltage position.B. Place the power switch to ON. If anyof the following do not occur, pressOFF at once and investigate beforeproceeding.1. The power switch light shouldlight.2. The meter lights should light.3. The fan motor should start andair flow should be felt at theexhaust port on top of theamplifier.4. The wait LED should light.5. All meter indications are zero.6. All other LEDs are not lit.2.5 TUNE UP PROCEDURE : Thefollowing section describes importantpoints to observe during tune up. Asuggested procedure for safely tuning upthe TITAN II is included.2.5.1 CHECKS TO MAKE BEFORETUNING UP: Check the load connectedto the amplifier. This can best be done byleaving the TITAN II in the BYPASSmode and using only the transceiveroutput power. Use a reliable SWR bridgeor watt meter to determine the SWR of theload (antenna) connected to the amplifier.If the reflected power is less than 10% ofthe forward power , the VSWR is lessthan 2:1. If the reflected power is 4% orless, the VSWR is 1.5:1 or lower. AVSWR of 2:1 or less is required.2.5.2 IMPORTANT POINTS TOREMEMBER: The most importantparameters to observe during tune up arethe currents in the control grid and thescreen grid. Excessive grid current evenfor a relatively short period of time, canand will damage the tube. If grid currentsare not exceeded, the 4CX1600B tube willdeliver many years of trouble free service.In the TITAN II the control grid ismonitored by front panel LED indicator.When control grid current is exceeded ,the LED lights. Reduce the driveimmediately and retune the TITAN II.Screen grid current is monitored by themultimeter , when in the Is position andby an LED overdrive indicatorcontinuously. Screen grid current shouldbe kept to a minimum during tune up andalways in a positive direction. Whenscreen current is exceeded the screenoverdrive LED will light. Reduce driveimmediately and re tune. After tune up ,erratic lighting of either over driveindicator could indicate breakdown in theload (antenna components). Reduce driveand check for arcing or heating of balluns,coax or other elements.2.5.3 SUGGESTED TUNE UPPROCEDURE : Following is therecommended procedure for safe andproper tune up of the TITAN II .A. Set the band switch to the desireoperating frequency.B. Set the multimeter switch to the Epposition.C. Place the STBY/OPR switch toOPR. The operate LED lights andhigh voltage is indicated on themultimeter (approximately 3000VDC).D. Set the meter switch to the Isposition. Always monitor Is with themultimeter. Use FWD and REVpositions momentarily for checkingoutput power. Always monitor the
2-2Overdrive LEDs and reduce drivewhen either is lit.E. For initial tune up you set the TUNEand LOAD controls to their centerpositions. Alternately you may referto the suggested settings in the chartin figure 2-4. Keep in mind thatthese settings are for operation intoan ideal 50 OHM load and may varyslightly.F. Turn the transceiver RF outputcontrol to minimum. IF AT ANYTIME THE TITAN II DOES NOTRESPOND AS EXPECTEDremove drive immediately andcorrect the problem beforecontinuing.G. Key the transceiver and slowlyincrease the drive power until yousee the plate current increase. NOTE: To prevent sustainedarcs, use a keyer and astring of dits at approximately30 WPM.H. Adjust the TUNE control for a peakin plate current and a peak in RFpower output.Adjust the LOAD control for aminimum grid current. You will findthat these values are not alwayssynchronized. Choose the lowergrid current adjustment even if thepower output is slightly less.Readjust the TUNE control for aplate current peak each time youadjust the LOAD control. There willbe some interaction between thesecontrols.I. Gradually increase the drive levelfrom the transceiver until you reachthe desired output power level whilecarefully touching up the TUNE andLOAD controls for minimum gridcurrent and maximum output power.J. Once you have the amplifier tuned upand operating on the desiredfrequency, you can log the LOADand TUNE settings in the chartprovided on page 2-9. These settingswill be repeatable for the samefrequency , antenna , and SWRwhen used in the future.
2-3CHAPTER 3OPERATING HINTS3.1 INTRODUCTION : The following paragraphs provide additional information forgetting the best performance from your TITAN II amplifier.3.1.1 HIGH POWER TETRODE : The 4CX1600B is very rugged and normally operateswith a large margin of safety in the TITAN II . It will deliver outstanding service for manyyears if not damaged by abuse...especially excessive grid current or blockage of cooling airflow.3.1.2 INTERLOCKS : The TITAN II is equipped with interlock switches intended to shutoff the power and short out the high voltage power supply when the cover is not securelyfastened in place. These protective interlocks are provided to protect you fromPOTENTIALLY FATAL ELECTRIC SHOCK resulting from accidental contact with lethalvoltages inside the amplifier. However , you should never depend on interlocks alone toprotect you by removing dangerous voltages. ALWAYS DISCONNECT THE AC LINECABLE TO THE TITAN II BEFORE REMOVING THE TOP COVER.3.1.3 FUSES : Except in rare instances of component failure , blowing one or both primaryfuses indicates that maximum safe average power capabilities of the amplifier have beensubstantially exceeded.3.1.4 TRANSFORMER RATINGS : The transformer in the TITAN II is rated at 2.5 KVACCS (continuous commercial service). It weighs 42 lbs. The weight of a transformer isdirectly proportional to the capacity of that transformer. A 35 lb. transformer may be ratedhigher by another manufactor but only if different standards are applied, such as heat rise.Just for comparison , if our transformer was rated for IVS (intermittent voice service) or SSBoperation only, It would be 9 KVA. In summary , your power supply is more than adequate.KEEP THE AIR INTAKE AND EXHAUST VENT AREASCOMPLETELY CLEAR !!!WARNING !!! DO NOT ALLOW THE SCREEN GRIDCURRENT TO EXCEED 55 MaWARNING !! THE AMPLIFIER SHOULD NEVER BEENERGIZED WITH THE COVERS REMOVEDDO NOT DEFEAT THE INTERLOCK SAFETYSWITCHES
2-43.1.5 OPERATION ON 120 VAC : TheTITAN II is normally shipped from TEN-TEC wired for operation on 240 VAC. Thepower supplies in the TITAN II can bemodified for 120 VAC operation (but notrecommended). If you operate on 120 VAC ,POWER OUTPUT MUST NOT EXCEED1000 WATTS. To change the TITAN II foroperation on 120 VAC you will need thefollowing tools : 1 - medium size phillips screwdriver 1 - pair long nosed pliers 1 - soldering iron and solderTo perform the modification , refer to figure3-1 and proceed as follows.A. Make sure that the AC line isunplugged and that all other cables aredisconnected.B. Remove both bottom inspection plateof the TITAN II.C. Locate the (81815) Screen supplyboard. There should be two jumperwires already installed . For 120 VACterminals #1 and #4 are jumperedtogetherD. Remove the jumper at #1 and move to#5E. Remove the jumper at #4 and move to#7F. Add jumper #10 between #4 and #1G. Replace the inspection plate andsecure tightly.H. The AC lines are still fused at 20AMPS The internal wiring of theTITAN II is not rated for full output at120 VAC. NEVER EXCEED 1000WATTS.
4-1CHAPTER 4MAINTENANCE AND TROUBLE SHOOTING4-1 INTRODUCTION If you encountera problem , the troubleshooting hintslisted in TABLE 4-1 below will helpisolate the nature of the problem.4-2 MAINTENANCE The amplifiercompartment , particularly areas aroundhigh voltage components should becleaned frequently enough ( using a softbristled brush and vacuum cleaner ) toprevent visible accumulation of dust. DONOT blow air directly into the fan input:this con over rev the motor and damagethe bearingsSYMPTOM POSSIBLE CAUSE/CURE1. Will not turn on: nothing happenswhen the ON switch is activated. A] Fuse missing or open.B] House wiring incorrect or breaker open.C] Power cable to amplifier disconnected.D] Fuse on HV-AC board (81810) open.E] Problem with low voltage power supplyon QSK board (81814)2. Lights turn on but no high voltage,relays do not close. A] Interlock open, cover not tight3. Relays K2 and K3 on HV-AC board(81810) close but relay K1 does not.Plate Voltage drops when RF is applied.A] Q1 ON 81810 HV-AC BOARD ISdefective .B] K1 on 81810 is defective.4. Relays K1, K2, K3 on 81810 HV-ACboard close but no high voltage at turnon.A] K2 , K3 defective.B] HV short to ground.C] High voltage transformer disconnected.D] High voltage bridge open.CAUTION: NEVER TRUST ONLY ONEHV METERING CIRCUIT. THERECOULD BE HV PRESENT BUT THEMETER DOESN’T REGISTER IT.ALWAYS DOUBLE CHECK WITH ANEXTERNAL HV METERTABLE 4-1 TROUBLE SHOOTING HINTS
4-2TABLE 4-1 TROUBLE SHOOTING HINTS ( Continued)5. Relays K1, K2, and K3 close at turn on ,but line fuses blow. A] High voltage at crowbar or elsewhere.B] Shorted tube.C] Leaky electrolytics in high voltagesupply.6. Amplifier won’t drive , zero grid and platecurrent , High input SWR . A] Defective cable from transceiver toamplifier.B] Input relay K2 on 81816 SWR boarddefective.C] Input filter on 81811 input matchingboard loose or damaged.7. Grid over drive led lights with no drive. A] Q7 on 81815 shorted or leaky.B] Shorted or leaky tube.8. Screen over drive led lights with no drive. A] R23 on 81815 board open or increased invalue.B] Low or no high voltage. TURN OFF THEAMPLIFIER IMMEDIATELY.9. Amplifier difficult to drive , little or nooutput , high plate current (may beaccompanied by a “frying sound”).A] Band switch in wrong position.B] Excessively high load SWR.C] Defective output relay on 81816 SWRboard.D] Arcing in tank circuit or antenna feedline.10. Excessive plate current in receive mode. A] Defective bias circuit on 81814 board.B] Shorted grid /cathode in tube.11. Transceiver does not key using key-in/key-out loop. A] Key-in and key-out lines reversed atamplifier or at Transceiver.B] Defective key line cables.C] Defective relay control circuit on 81814QSK board.12. Transceiver stays keyed in receive mode.May be accompanied by loss of receivesignal.A] Relay K1 on 81816 SWR board stuck.B] Shorted key-in or key-out cable.C] Defective relay control circuit on 81814QSK board.
5-1CHAPTER 5CIRCUIT DESCRIPTIONS AND ILLUSTRATIONS5-1 INTRODUCTION The following sections contain detailed circuit board subassembliesused in the Model 416 Linear Amplifier. Also included are circuit trace drawings anddetailed component layout diagrams. These drawings are followed by schematic diagrams foreach circuit board subassembly. In addition , there is an overall wiring diagram for theModel 416 Amplifier.
5-2
5-3INPUT MATCHING BOARD (81811)This board contains the input filter,impedance matching networks , and ALCcircuits. The input filter network (81550) is thestandard input filter shipped with theTITAN II. This is a five pole elliptic filterconsisting of L1,L2,L3,C1,C2, and C3.This filter provides increased roll-off offrequencies above the 15M band. Anoptional 15/10M INPUT FILTERBOARD (81840) is available from TEN-TEC to qualified amateur radio operators,upon receipt of a copy of their amateurradio license. Note: Operation on the10m band will also require additionalmodifications to the bandswitchassembly. Please contact the factory forinstructions or further information. The impedance matching network ofresistors R5 –R40 match the inputimpedance of the 4CX1600B to the inputfilter board. The ALC circuit samples the input RFpower to the amplifier. D1 rectifies thissample and produces a negative voltageproportional to input power for control ofsome exciters.
5-4
5-581809 H.V. POWER SUPPLY BOARD This board contains the high voltage rectifierbridge (D1 – D20),H.V. filters (C1 – C9), and H.V. meter circuits (Voltage and current).
5-6
5-781815 SCREEN SUPPLY AND GRID BIAS BOARD This board contains the screensupply ,grid bias supply, and protective circuits for the 4CX1600B.The screen voltage is rectified by diodes D4 – D7 and filtered by C1 – C4. This DC voltageis then regulated by pass elements Q9,Q5,Q6, and Q8. Load resistors R25 – R27 provide acurrent drain to insure screen current remains in the positive direction.. MOV Z1 protect thepower supply in the event of tube arc and insures the screen voltage can’t surge above 450VDC. R23 provides a voltage drop proportional to the screen current to drive the front panelscreen current meter. The grid bias voltage is rectified by D13 then filtered by C10. Q1 senses the key conditionand switches zener diodes D2 and D8 in during key down and out during key up. This zenersthe bias voltage to –50 VDC during TX and –130 VDC in RX. The circuitry of Q7 sensesgrid current and begins to fold back grid bias toward cutoff as grid current approaches 2watts.Zener diode D1 provides regulation for the negative 16 VDC power supply to run the metercircuits on the meter switch board.
5-8
5-981814 QSK BOARD This board contains the low voltage supply , turn-on relaysequencing circuits , and T/R relay control. The low voltage is rectified by D1 – D4 and filtered by C6. U1 and Q4 provide regulationfor all low voltage circuits except the negative 16 VDC supply. After a 3 minute warm-up period determined by RC time constant of R5 and C5 ,Q12 willfire turning on the pass element Q7. This initiates amplifier power up. When the operateswitch is put in the operate position this voltage is applied to relay sequencing circuits ofQ5,Q15, and Q13.These circuits insure plate and screen voltages arrive at and leave the tube in the properorder. Q18 senses plate current and disables the amplifier when plate current e parameters areexceeded (such as excessive plate current during a tube arc).Both plate voltage and screenvoltage are removed when plate current of 1.2 AMPs is reached. U2 and U3 are the gated array that controls the input and output relays. This circuitsamples input key requests , standby/operate modes, power on/off state and RF presence atthe antenna connection. Hot switch protection is provided regardless of mode. In the QSKmode, using the key in / key out loop , the key in request from the transceiver is tailored byU1 and U2 to insure smooth QSK action of the input and output relays. K1 senses power off and places the key circuit in bypass mode for operation in barefootmode. K2 senses Operate/standby mode and routes the key request either to the amplifier controlcircuit in Operate mode, or to the key out jack in the standby mode.
5-10
5-1181816 SWR BOARD This board contains the input relay, output relay, and the swr bridgefor output power measurement.
5-12
5-1381813 PLATE BOARD This board contains the parasitic suppressors and couplingcapacitors to connect the 4CX1600b plate to the amplifier tank circuit.
5-1581812 METER SWITCH BOARD This board contains the metering circuits for the frontpanel meters. SW1 selects the parameter to be monitored. This selection is then sent to M2.The multimeter has three calibrated scales for measuring either plate voltage, screen currentor RF power (forward or reverse). U1 samples screen and control grid current and drives the appropriate LED to indicateexcessive current of either screen or control grid. Q1 samples forward RF power voltage from the SWR board. This voltage is peaked byC8 and sent to U2 to drive the peak reading display.
5-15
5-1681810 AC LINE DELAY BOARD This board contains the step start relays and associatedcircuitry to control inrush current while the H.V. filter capacitors charge.

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