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1. GOOMN gt rro Ec i ey oe re LO C LINEAR AMPLIFIER L 922A INSTRUCTION MANUAL KENWOOD CORPORATION It is advisable to save all original packing cartons inner and outer to protect your valuable Linear Amplifier from damage should you wish to transport it for remote opera tion or ship it for after sales service The following explicit definitions apply in this manual Be sure to read these definitions NOTE If disregarded inconvenience only no damage or personal injury CAUTION equipment damage may occur but not personal injury WARNING personal injury may occur do not dis regard CONTENTS TL 922A 5 5 3 SECTION 1 FEATURES 4 SECTION 2 PREPARATION FOR USE 5 2 1 Accessories 2 2 Installation of Power Tubes 2 3 General Tips on Installation 2 4 AC Power Source 2 5 Line Voltage Change 2 6 Power Cable 2 Exciter 2 8 Antenna 29 Interconnection 2 9 1 Grounding 2 9 2 Cable Connection SECTION 3 CONTROLS AND THEIR FUNCTIONS 9 3 1 Front Panel 3 2 Rear Panel SECTION 4 OPERATION 11 4 1 Prechecks 4 2 CW Operation 4 3 SSB Operation 4 44 RTTY Operation 74 5 Setting the ALC ADJ Control 4 6 Adjusting the RF Output Meter 4 7 High Voltage Transformer Protection 4 8 Carrying You2. x gt a 0 3 do R2 R3 R4 RS R6 R7 91 9 oe es os os oc o7 272 9 c3 c5 ce MsB cl e 55 R 14 470K Dl 14 VO8J 2 1 14 0 01 2 5 oz METER RE RS RIG RIS RIA wi 3 54 1300 10 quls 299999 PLI 4 METER LAMP Figure 7 4 5 4 Circuits and specifications subject to change for improvement C34 OOI ISKV ATIC DIAGRAM 6 429 575 817 amp 770 DIN PLUG N N 8 70 MS ONYE 1701 48 1 95 x o9 dO4b 4022 v 2 990 RII 04 42 1110 11 RL CONT RL 1 1 E 22 12 dos gt 3 12 HE EL yao 4 gt ANG 022 D v A u zoa 2 0 4022 552 GL eer ZAAO 5 5294 E H AOS 5 1 00 92 220 65 AX9 dOl 5 082 Hs mw 064 89 Oh HO49 27 Er rv 3 3 E 9022 622 T a Hk o sox 022 O 9 J OBR it nuu 2997 oor o NI t Na He 002 E Lk mq 0 N ow gt 05 5 9 8 gt gt S 19 T
3. 1 CAUTION Particular care should be taken not to strike and break the glass tubes during installation Tube break age due to negligence is not warranteed Refer to Fig 2 3 Temporarily fix each parasitic sup pressor coil on the plate cap with the letter Ror 1 facing up At this time do not tighten the 4 mm screw and spring washer but snug them so the coil may be adjusted Mount the plate cap with parasitic suppressor coil on each tube observing the right hand and left hand coil designations If the screw holes do not align shape the coil by slight bending or extending by hand for precise installation keeping the coil below the level of the plate cap CAUTION Particular care should be exercised in not applying excessive force to the tubes Carefully tighten the screws at each end of the coil while holding the plate cap by hand Tighten the plate cap screw using the small standard screwdriver Check to assure correct installation by reference to Fig 3 3 TE Before installation check each parasitic suppressor coil for good alignment to prevent the application of excessive force to the tubes Letters and L on the coils should face up Temporarily install each coil on their plate caps before final F tightening Use Philips screwdriver igure 2 3 Parasitic Suppressor Coil Mounting Tube Installation Checkout 1 To avoid damage necessitating tube replacement
4. RELAY RELAY POWER SOURCE TO ALC CIRCUIT ALC CONTROL ALC d 0 20V Figure 2 6 Exciter Connections for RL and ALC Controls TRANSMIT RL CONTROL RECEIVE l t i 2 9 INTERCONNECTION 2 9 1 GROUNDING Connect the GND posts of the TL 922A and exciter RFI to prevent possible electric shock and The wire used should be as thick and short as possible and run to a good earth ground 2 9 2 CABLE CONNECTION Interconnect your TL 922A and exciter with the supplied cables as illustrated in Figure 2 7 NOTE If you use an exciter of another brand replace the supplied connector with one appropriate to your exciter The exciter used must accept the negative going ALC voltage from the TL 922A The ALC output at no signal input is normally positive when not connected to the exciter The RL or standby control in the exciter must be switched to ground in transmit mode as illustrated in Figure 2 6 NOTE Use RG 8 U RG 11 U or heavier as antenna cable NOTE If an SWR meter is connected between the TL 922A and the exciter total co axial cable length must not exceed 1 7 m 1 gt LER D LI 1 D D LEID 4D LIN HD BL ED LIO LP 4 E EID SECTION 3 CONTROLS AND THEIR FUNCTIONS ET D HR UD uiu Figure 3 1 Front Panel View
5. 3 1 FRONT PANEL 1 IP Meter The IP meter reads the plate current flowing through the power tubes ON AIR Indicator The ON AIR indicator lights up in the on the air or transmit MODE PLATE Tuning Control This control permits you to tune the plate circuit to the desired transmit frequency and is equipped with a reduction gear for easy tuning Multimeter The Multimeter can read the g grid current RF relative power output or HV plate voltage as selected by the METER switch STBY Indicator With the unit turned on shows unkeyed or receive state LOAD Control Impedance matches the pi network to the antenna POWER Switch A double pole switch completely disconnects the AC input from the transformers MODE Switch Set for SSB or CW For RTTY operation set the switch to the CW position 10 11 METER Switch Selects Ig grid current RF relative power output or HV plate voltage BAND Selector Set for the Amateur band in which operation is desired LINEAR Switch In the STBY position the exciter runs straight through In the OPERATE position the Amplifier automatically keys with the exciter 5 6 7 10 8 f rowr ite M y amp 2 2 Figure 3 2 Rear Panel View 3 2 REAR PANEL 1 10 Cooling Fan The Cooling Fan cools the power tubes and effectively keeps the inside temperature from increasing Be careful of hot air 50 to 70 C at the exhaust port Line Volt
6. CURRENT 7 7 SECTION 6 MAINTENANCE WARNING YOUR TL 922A USES VERY HIGH VOLTAGE DISCON NECT ALL POWER FROM THE TL 922A BEFORE RE MOVING OR REPLACING ANY PARTS PARTICULAR LY IN REMOVING THE UPPER AND LOWER COVERS FOR MAINTENANCE ALSO MAKE CERTAIN THAT THE HV METER 05 0 6 1 INTERNAL CLEANING The cooling fan in your T L 922A pulls air in through the bottom and side walls Every three months vacuum clean the bottom vents side escutcheon vents tube glass and sockets and all areas in which dust collects Include the high voltage diodes the electrolytic capacitors the vanes of the plate and load tuning variable capacitors and the fan This is necessary to prevent arcing and overheating 6 2 REPLACING THE POWER FUSES Power fuses are located at the rear of the TL 922A In the event of blown fuses first determine the cause For replacement use only 15 A fuses either in 120V or 240V line operation WARNING Be sure to disconnect the power cable before replacing fuses 6 3 REPLACING THE POWER TUBES Refer to Section 2 2 Installation of Power Tubes 6 4 INPUT MATCHING CIRCUIT The input matching circuit is preset at the factory for broad band characteristics and needs no adjustment There are dangerous high RF and DC voltages in the circuit For readjustment contact your nearest Trio Kenwood authoriz e
7. 1 5kV for CW and below 2kV for SSB Low exciter output b Improper setting ALC ADJ control Different positions of BAND switches between exciter and TL 922A Low line voltage Readjust exciter Readjust control Refer to Section 4 5 Set both BAND switches to same po sition Improve line regulation refer to Sec tion 2 4 1 3 meter swing too hi or low Improper RF control setting Adjust RF control until RF meter reads Approximately 7 on scale Refer to Section 4 6 4 Fuse blows when POWER switch is turned ON Inside shield plate incorrectly installed causing interlock switch to short high voltage line to ground Reinstall inside shield plate and re place fuse Refer to Section 2 2 2 5 Upper case over high voltage trans former too hot Line voltage change terminal cover on rear removed or ajar Replace cover securely 6 Linear amplifier does not key 16 1 Internal connector was not moved 2 REMOTE connector is miswired or has a poor contact Refer to the TS 4408S instruction man ual PACKING MATERIAL PACKING MATERIAL PLASTIC JOINT PACKING CASE Figure 7 1 Packing for Shipment 17 USD GIU HD e ED LES LED COD ILIO HL CUL LI INTERNAL PARTS LOCATIONS POWER SUPPLY CAPACITOR HOUSIN
8. Exciter output exceeding 120W will cause overdrive resulting in shortened power tube life and distorted output To limit the power level above 120W use exciter having an external ALC input terminal CAUTION SURE TO TIGHTEN ALL LOOSENED SCREWS Use Philips screwdriver Spare shorting bars are secured at terminals 3 and 4 a 240V setting b 120V setting Figure 2 4 input Voltage Terminal Boards Trio Kenwood s transceivers Series 5 930 TS 940 TS 830 TS 820 TS 530 TS 520 5 430 5 4405 TS 180 TS 130 TS 120 and TS 900 and transmitters Series TX T 599 are all suitable exciters and will match the TL 922A in design as well as appearance NOTE When the TS 440S is used the modification is ne cessary Refer to TS 4408S instruction manual 2 8 ANTENNA Your TL 922A requires an antenna having 50 to 750 impedance and providing it is 1 Rated for 2 kW input power 2 and exhibits a low standing wave ratio SWR Desired SWR is 1 5 to 1 or less A higher SWR 2 or 3 to 1 may cause difficult matching with your TL 922A Excessive SWR could melt the coaxial cable and antenna To protect your TL 922A against adverse SWR effects use an antenna tuner Note that feeder radiation due to mismatching will cause or similar BLACK WHITE TO 240 120V LINE TO GROUND GREEN Figure 2 5 Power Cable Color Code EXCITER TL 922A
9. please check a Power tubes are free from scratches or other physical defects Tubes are fully inserted into their sockets Plate cap screws tightened securely d Screws at both ends of the parasitic suppressor coils are tightened securely e Washers screws drivers and any other unneces sary material is not left inside the unit 2 Refer to Fig 2 1 The inside shield plate includes the high voltage secondary protection switch plunger a bakelite bar Position the plate so that the plunger will securely engage the spring plate for ungrounding the plate high voitage 3 Install the upper case cover with its leading edge in serted approximately 1 mm into the front panel lip This cover has the high voltage primary protective switch plunger Position the cover so the plunger will engage the microswitch 2 3 GENERAL TIPS ON INSTALLATION Install in a dry well ventilated area shaded from direct Sun light Your TL 922A must have a minimum clearance of 15 cm to the rear to allow hot air at 5O to 70 C to exhaust Choose an operating position capable of safely supporting the weight of the TL 922A 31 kg plus all the other station equipment Level your TL 922A in operation The heated electrodes in each power tube will be distorted by gravity resulting in shortened service life if slanted beyond 107 2 4 AC POWER SOURCE Use an AC power line having sufficient current capacity or the performance of your TL 922A wil
10. 100W Repeat steps 6 and 7 several times for the highest RF output If the Ip exceeds 650 mA reduce the RF input from the exciter by turning the ALC ADJ control on the rear panel Refer to Section 4 5 Set ting the SLC 9 Make certain that the Ig grid current is below 200 mA not adjust the ALC ADJ control to reduce the input level CAUTION Never change the BAND switch while trans mitting TABLE 4 2 Tune and load initial setting 100W input 500 output loading Initial load setting SSB 4 3 SSB OPERATION Tune up as in CW operation Reduce the exciter carrier con trol to minimum and change the linear mode to SSB In crease the exciter carrier control and tune for maximum out put When tune up is complete reduce carrier level to minimum 11 CAUTION DO key the linear in SSB mode with full CW power ALWAYS start and finish this procedure by reducing exciter carrier level to minimum DO NOT under any circumstance OPERATE your exciter in the CW mode while the linear is in the SSB mode Failure to heed this warning may cause immediate exten sive damage to the amplifier repair of which will not be covered by your warranty REPEAT DO NOT OPERATE CW IN THE SSB MODE To improve linearity in the SSB mode adjust the LOAD control 0 5 to 1 0 division clockwise from the maximum RF output position and readjust the PLATE tuning control for maximum reading on the RF scale
11. 8 TABLES 1 Front Panel Controls Set Up 11 2 Tune and Load Initial Settings 11 NE Transmit Frequency Range Excitation Energy Required Mode and Duty Cycle Rated Plate Input Plate Voltage at No signal Circuit Type 3rd Order Intermodulation Distortion Input Impedance Output Impedance Cooling Interlock Safety Features Thermal Protector Fan Motor Delay Stop Time ALC Power Tubes Used Semiconductors Power Requirements Cables Supplied Dimensions Weight HU OLD OLD UD TL 922A SPECIFICATIONS HO HO HUE CHE ENDO 000 10009 CIELOS ADONE 0060 CORDES OR 10000 CHEDD EE UP OLEI 160 m through 15m Amateur Bands 80 W nominal 120 W maximum SSB continuous for 30 minutes CW and RTTY key down continuous for 10 minutes 2 kW P E P SSB 1 kW CW RTTY 3 1 SSB 2 2 kV CW RTTY Class AB2 grounded grid linear amplifier Below 30dB 50 unbalanced at better than 1 5 SWR 50 to 75 unbalanced Forced Air Primary high voltage circuit cut off Secondary high voltage circuit grounding Locks out transmit relays if H V power transformer overheats 140 30 seconds at room temperature Negative going adj
12. G METER UNIT M X54 1300 10 10 eeey INTERLOCK SW SECONDARY HIGH VOLTAGE INTERLOCK SW BEI gt PC2 PRIMARY HIGH i VOLTAGE v2 TE COOLING FAN PLATE CAPS 14 15 PC1 L10 57 TUBE SOCKET L3 L20 TUBE SOCKET POWER SUPPLY CAPACITOR 1 HOUSING fe FUsE 15A T2 Figure 7 3 Botoom View 18 HGUUED UU E D UN CEPOL D dB P HN E E CC ERED UD 3D S nn p jd mp NB D EID d SCHEMATIC DIAC RF 14 14 gOPER 16 HV 9 79 9 pai 210 o7 3 50 03 5 Lauf No 0 8 COM COM oe 1 2 3 50 IG POSITION 1 8 BAND POSITION s V3 DSA 30l LINEAR METER SW BAND SW lt x DI VOSE 54 55 56 1 2 I 8MHz BAND POSITION x 1 BAND SW 57 1 2 869 5 03 51587 8 04 5 6 1 6 07 005 X54 1300 10 L2 l2pH INTER LOCK O 090 TS S5 METER l CONNECTION 1 3 54 13 1G 120 240 4 X43 1280 10 Y
13. L 922A K Model TL 922A Serial No Date of Purchase Dealer KENWOOD CORPORATION Shionogi Shibuya Building 17 5 2 chome Shibuya Shibuya ku Tokyo 150 Japan KENWOOD U S A CORPORATION 2201 E Dominguez Street Long Beach California 90810 U S A KENWOOD ELECTRONICS DEUTSCHLAND GMBH Rembr cker Str 15 6056 Heusenstamm West Germany KENWOOD ELECTRONICS BENELUX Mechelsesteenweg 418 B 1930 Zaventem Belgium KENWOOD ELECTRONICS AUSTRALIA PTY LTD INCORPORATED IN N SW 4 Woodcock Place Lane Cove N SW 2066 Australia ree Anne nna
14. This adjustment should be made only once not repeated and will minimize possible distortion at peak 1 plate current allowing your TL 922A to run at optimum linearity Note that the Ip plate current should not exceed 400 mA for voice peaks Even this low degree of plate current is enough to fully drive the amplifier Do not drive the power tubes excessively turn off the ALC or otherwise run the Amplifier to distortion This will also generate spurious emissions causing interference with local stations Greatest operating efficiency cleanest signal and extended tube life can be achieved by conserva tive operation 4 4 RTTY OPERATION CAUTION Maximum key down 10 minutes To use a radioteletypewriter RTTY with your TL 922A follow CW tune up procedures outlined in Section 4 2 4 5 SETTING THE ALC ADJ CONTROL Some exciters may cause the Ip plate current in your TL 922A to exceed 650 mA in the CW mode or the Ig grid cur rent to exceed 200 mA If this occurs remove the cap nut and adjust the ALC level control on the rear panel to bring current within specified limits If after following the tune up procedures outlined in Sec tion 4 1 1 Ig cannot be reduced to their specified level proceed as follows 12 1 Set the carrier level for 600 to 650 mA maximum Ip plate current and 200 mA or less Ig grid current Adjust plate and load controls for maximum RF output 2 Increase the carrier level until Ip pla
15. age Change Terminals These terminals are located behind the rear cover which is removed by pulling the two snap fasteners For input voltage change please refer to Section 2 5 Serial No Plate This plate is stamped with the Serial Number of your TL 922A METER Control This control is used to calibrate the RF output read ing For calibration see Section 4 6 ALC ADJ Control This control is used to adjust the ALC voltage For adjustment see Section 4 5 ALC OUT Jack This jack feeds the ALC voltage out RL CONT Jack This jack inputs the transmit receive relay switching ground from the exciter 10 11 12 RF INPUT Connector This UHF type connector inputs the RF signal fed from the exciter Use the supplied cable RF OUTPUT Connector This UHF type connector feeds the RF output to the antenna GND Post Use this post to ground the TL 922A to your exciter and station ground FUSE Holders 2 Each contains a 15 A fuse If either or both fuses are blown determine the cause before replacement POWER Cable AC power is supplied to the amplifier by a three wire cable See section 2 6 H i 4 i i i F 4 1 5 If you newcomer to this type of equipment or if you have replaced a power tube you should first assure yourself of the following before connection of power and turn on a Power tubes are installed correctly Verify tube installation checkou
16. d service facility 15 TROUBLE LED GUI ALD OHIO UU ED 9 DUO SECTION 7 TROUBLESHOOTING HINTS 4L CUI CBE D OD OH HD HELD EU OUI mit COMMON CAUSE REMEDY 1 No power output 1 Relay will not activate 2 Relay is activated a Exciter RF meter swings off scale HV meter will not swing no Ip plate current cooling fan inoperative Ip RF meter swings off scale Ip will not change Control cable disconnected Power supply protector in lock due to temperature rise from extended transmission c LINEAR switch at STBY d ALC and RL plugs reversed Defective coaxial cable connection Interlock switch not depressed due to faulty upper case cover installation Antenna coaxial cable disconnected RF INPUT and RF OUTPUT coaxial connectors reversed Secure control cable Allow standby for approximately 15 minutes with power switch on for forced air cooling Refer to Section 4 7 Turn switch to OPERATE Correct reversed cables Correct connection Correct upper case cover installation Refer to Section 2 2 3 Correct connection Correct reversed cables 2 Output power too low 1 Ip plate current below 400mA 2 Hv plate voltage in max drive state below
17. econdary high voltage circuit Also provided are bleeder resistors for discharging the high voltage capacitors and DANGER warnings at high voltage positions Please observe all warnings they are for your protection Newly Developed Fan Motor Delay Stop Circuit To reduce power tube deterioration your TL 922A has a newly developed fan motor delay stop circuit comprised of a thermal delay relay The cooling fan will normally run for 140 seconds Typ after power is removed from the unit and will measurably ex tended tube life Mode Switch for Efficient Linear Operation MODE switching is provided to select between the SSB Mode for the maximum PEP output with good 2o ED OU ED RED UD UD ED TL HOD HE ULL SECTION 1 FEATURES IHID UHD UH OB ED LL EAD EBD RHOD CADROD EOD EID CT MO ALD ED OHIO ID ERO HD CD CUL OLD LED CUR UI CALO D D 10 11 12 13 linearity and the CW Mode for low power consump tion and heat generation during extended periods of operation Linear Amplification Control Switch This switch is capable of setting your TL 922A in the straight through state irrespective of the standby control on the exciter Variable Threshold Level ALC Detector The ALC circuit will accommodate exciters of 80 w to 120 w nominal by varying the ALC threshold
18. ial cable 1 5m with UHF type connectors X42 1100 00 1 piece 3 Control cableW 8Pin Plug 1 piece For TS 520 TS 820 Series X42 1110 10 4 Control cable W 7 Pin Plug 1 piece For TS 120 TS 130 TS 180 TS 430 TS 440 TS 530 TS 830 TS 930 TS 940 Series X42 1110 11 5 Spare fuse 15A 5 1533 05 2 pieces 6 Extension foot JO2 0049 14 2 pieces 7 Screws 4 x 12mm long N30 4012 46 2 pieces 8 Plate cap 2 0407 04 2 pieces 9 Parasitic suppressor coil right hand 1 piece L39 0401 05 10 Parasitic suppressor coil left hand 1 piece L39 0402 05 11 Screw 3 x 6mm long N30 3006 46 4 pieces 12 Plain washer N15 1030 46 4 pieces 13 Spring washer N16 0030 46 4 pieces 2 2 INSTALLATION OF POWER TUBES To protect the power tubes in your TL 922A against vibration and shock during transport they were packed separately from the amplifier For insertion follow the procedures below Prepare the following mounting hardware and tools Mounting Hardware Power tube 3 5002 Plate cap Parasitic suppressor coil right hand and left hand 2 pieces 2 pieces 1 piece each Screw 3 x 6 mm long 4 pieces Plain washer 4 pieces Spring washer 4 pieces Tools Phillips screwdriver 1 piece Small standard screwdriver 1 piece NOTE A parts tray to prevent loss of metric hardware is helpful WARNING Before proceeding make sure that The power cable is NOT plugged in the wall out let The METER switch is at the HV position and the mult
19. imeter reads OV Proceed as follows Refer to Fig 2 1 1 Remove the four 4 mm Phillips screws holding the upper case cover 2 Remove the upper case cover 3 Remove the four 3 mm self tapping Phillips screws and four flat head self tapping Phillips screws holding the inside shield on the power tube enclosure 4P HUD ID HOD 1 0005 0009 UP HUN UND HEU QUUD LU CUN 40100 SECTION 2 PREPARATION FOR USE 4 Remove the shield plate 5 Take the tubes out of their case Refer to Fig 2 2 In handling be sure to hold them by the glass envelope not the plate cap 6 Carefully index the pins of each tube into its socket and insert gently without excessive force INSERT UPPER 4mm CASE COVER Y ff Y SCREWS LEADING EDGE INTO FRONT PANEL TOP LIP CASE COVER HIGH VOLTAGE 7 PRIMARY PROTECTION SWITCH PLUNGER 3mm FLAT HEAD SELF TAPPING SCREW 4 PCS t HIGH VOLTAGE SECONDARY PROTECTION SWITCH PLUNGER INSIDE 5 SHIELD PALTE Figure 2 1 Upper Case Cover Assembly Disassembly USE 2 Phillips Screwdriver INSERT Ow SWITCH PLUNGER Figure 2 2 Correct Power Tube Handling 10 11
20. l be adversely affected by inadequate line regulation In the worst case do not deviate more than 10 from the rated input voltage for which your Amplifier has been set 2 5 LINE VOLTAGE CHANGE WARNING DISCONNECT THE AC INPUT POWER CABLE FROM THE TL 922A BEFORE PROCEEDING The input voltage can be changed to either 240V or 120V as required by changing the power transformer input links located in the duct on the rear panel NOTE The TL 922A was factory set in the 240V position To change link positions remove the access cover by the two black snap fasteners Loosen the screws holding the shorting bars a few turns only Do not loosen excessively as they could drop into the Amplifier Draw each shorting bar upward for removal Replace the shorting bars for the operating voltage desired as illustrated in Fig 2 4 Tighten firmly Also be sure to tighten the screws from which the shorting bars were removed NOTE Fuses need not be changed in current rating when the input voltage is changed CAUTION Excess force may break the terminal strip 2 6 POWER CABLE The power cable supplied with your TL 922A has no plug at its end Connect a plug mating with the wall outlet The blue and brown leads are power the green lead ground as illustrated in Figure 2 5 2 7 EXCITER An HF Amateur band SSB or CW transmitter or transceiver having an RF output impedance of 500 and output power of 80W to 120W is sufficient to drive the TL 922A
21. l relay contact DL1 is still closed DL 1 1 opens after approximately 140 seconds thereby stop ping the fan 54 METER DRIVE CIRCUIT The power tube Ip plate current and 19 grid current can be read on their individual meters Figure 5 4 is the meter drive circuit Ip plate current is measured through shunt resistor R6 10 and deflects the Ip meter through R7 1 5 which adjusts meter sensitivity Similarly 19 grid current is measured on the Multimeter In addition to the lg the Multimeter can selectively read relative RF output which is a rectified RF signal and HV plate voltage Precise plate voltage reading is obtained through three serial voltage dividing resistors of 596 tolerance 5 5 SPARK SUPPRESSOR Your T L 922A contains an oversized relay for conservative operation and its action is slower than smaller relays The TL 922A is momentarily run leaving the antenna circuit open in such operations as VOX This leads to high O at the output circuit which would cause excessive voltage at the plate tuning capacitor This could arc the capacitor To prevent this your TL 922A has a discharge gap device at the antenna relay terminals to dissipate any unusually high voltage During relay changeover you might sometimes hear arcing from the discharge This is not a failure and should be considered normal R7 1 5 9 R6 19 Ip PLATE PLATE VOLTAGE Nous Ig GRID
22. level This effectively prevents overdriving the final power tubes limiting the Amplifier to its linear range and guaranteeing low distortion at maximum power Two Panel Meters In adjusting or monitoring your TL 922A one meter always indicates the Ip plate current while with the other you may read Ig grid current RF relative output or HV high voltage This facilitates ease of operation of your TL 922A Rigid Mechanical Structure The die cast side panels effectively support the weight of the amplifier against shocks and jarring during transportation Recessed side panel handles are pro vided so the Amplifier can be easily carried Vernier Plate Tuning Dial The PLATE tune dial is equipped with a reduction gear that facilitates easy tuning particularly for the higher bands It also effectively prevents accidental miss tuning during operation Controls and panel arrangement designed to human engineering standards provide superior ease of operation Neat Contemporary Appearance Mechanical arrangement and sophisticated design to match any Trio Kenwood transceiver or transmitter Your TL 922A can also be used as a high quality general purpose Amateur band linear amplifier with any exciter capable of to 120W RF output aui aditu 2 1 ACCESSORIES Carefully unpack your TL 922A Linear Amplifier and check that it is supplied with the following accessories 1 Instruction manual B50 2587 20 1 copy 2 Coax
23. lving The Multimeter will read approximately 2 kV on the HV scale If you turn the MODE switch to the SSB position the meter will read ap proximately 3 kV Turn the LINEAR switch to the OPERATE position The exciter now controls the TL 922A for automatic transmit receive operation In the CW transmit mode Ip plate cur rent in the no signal state should be approximately 100 mA in the SSB transmit mode no signal state should be proximately 200 mA AUD HUS CD UID I UD OU HD EL SECTION 4 OPERATION ED 4 2 CW OPERATION CAUTIONS 1 Tune up should be accomplished quickly or power tube life will be shortened Maximum key down 10 minutes 2 Full break in operation is not possible If the exciter operates full break in opera tion TL 922A may be damaged Adjust the exciter for maximum output 2 Set the amplifier Mode switch to the CW position multimeter to RF 3 Adjust the carrier contro on the exciter for a 50 W level 4 Set the LINEAR switch on your TL 922A to the OPERATE position 5 Increase the carrier control the exciter for suf ficient drive to adjust the tuning 6 Quickly switch the amplifier to and dip the plate 7 Switch the amplifler to RF and adjust loading for max imum output 8 Increase exciter output to maximum power about
24. r TL 922A SECTION 5 CIRCUIT DESCRIPTION 13 5 1 Linear Power Amplifier 5 2 Power Supply 5 3 Fan Motor Delay Stop Circuit 5 4 Meter Drive Circuit 5 5 Spark Suppressor CAUTION Read Operating Manual Section 2 before proceeding to unpack and assemble your amplifier WARNING LETHAL VOLTAGES PRESENT SECTION 6 15 6 1 Internal Cleaning 6 2 Replacing Power Fuses 6 3 Replacing Power Tubes 6 4 Input Matching Circuit SECTION 7 TROUBLESHOOTING HINTS 16 PACKING ec ned 17 INTERNAL PART LOCATIONS 18 SCHEMATIC DIAGRAM 19 ILLUSTRATIONS Fig 2 1 Upper Case Cover Assembly Disassembly 5 Fig 2 2 Correct Power Tube Handling 5 Fig 2 3 Parasitic Suppressor Coil Mounting 6 Fig 2 4 Input Voltage Terminal Boards 7 Fig 2 5 Power Cable Color Code 8 Fig 2 6 Exciter Connections for RL and ALC Controls 8 Fig 2 7 Interconnection of the TL 922A 8 Fig 3 1 Front View 9 Fig 3 2 Rear View 10 Fig 5 1 Linear Power Amplifier Circuit 13 Fig 5 2 Transformer Primary Current Flow 14 Fig 5 3 Fan Motor Delay Stop Circuit 14 Fig 5 4 Meter Drive Circuit 14 Fig 7 1 Packing for Shipment 17 Fig 7 2 3 Bottom 1
25. s each of which is fused Note that fuses are not changed when the input line voltage has been changed see Fig 5 2 5 3 FAN MOTOR DELAY STOP CIRCUIT The cooling fan is held on for approximately 2 minutes to cool the power tubes after the POWER switch is turned off This is accomplished by the fan motor delay stop circuit comprised of bimetal thermal relay Figure 5 3 is a schematic diagram illustrating the circuit When the POWER switch is at OFF both the relay RL1 and the thermal relay DL1 are not activated and the fan is off L4 L5 1l 700 13 120V AC LINE 15A FUSE 51 11 120 _ o 15A FUSE 5172 240V AC LINE 15A FUSE 51 1 E 10 240 5 10 15A FUSE Figure 5 2 Transformer Primary Current Flow NOTE Bridge for 120V Line METER UNIT X54 1300 10 FROM 100V TAP ON TRANSFORMER T1 AC LINE Figure 5 3 Fan Motor Delay Stop Circuit 14 By turning the POWER switch to ON RL1 is activated star ting the fan At the same time voltage is applied to DL1 generating heat which makes the contact DL1 1 close in approximately 60 seconds By turning the POWER switch to OFF RL1 is de energized returning contacts RL1 1 and RL1 2 to their home positions But the fan continues operating as the therma
26. t with Section 2 2 b The upper case cover and inside shield plate are cor rectly installed per Section 2 2 The upper case cover controls the high voltage primary protection circuit This circuit also controls the fan motor power The inside shield plate controls the high voltage protection circuit grounding the HV supply which will immediately blow the power fuses if incorrectly installed Particular care should be ex ercised when installing the inside shield plate In addi tion the upper case cover and inside shield plate are needed for heat sinking the interior of your TL 922A For installation of these plates please refer to Section 2 2 How To Install Power Tubes c Line voltage change terminals are properly bridged for your local Line voltage Refer to Section 2 5 Line Voltage Change d Make certain that the exciter antenna and ground wires are connected properly Verify that the POWER switch on your 922 is in the OFF position BE FORE CONNECTING the AC power cable e Set the front panel controls of your T L 9224A as fol lows TABLE 4 1 Front Panel Controls Initial Set Up LINEAR STBY METER HV MODE CW Center of band used Fully counter clockwise Exciter frequency CAUTION Be sure to set the BAND switch to the same band as that of the exciter before operation is attempted Now you may turn the POWER switch Make certain that the fan motor is revo
27. te current and 19 grid current slightly exceed the specified values no more than 750 mA maximum 3 Set the ALC ADJ control until the Ip plate current is 650 mA or the Ig grid current is 200 mA If neither reading is affected by this adjustment re setting is unnecessary High current indicates over drive which results in excessive distortion spurious emissions and shortened tube life 4 6 ADJUSTING THE RF OUTPUT METER The swing of the RF output reading varies with the im pedance of the antenna To adjust remove the cap nut and set the RF METER control on the rear panel to register a 7 division swing when the RF output is maximum on any selected band 4 7 HIGH VOLTAGE TRANSFORMER PROTECTION The high voltage transformer in your TL 922A has a thermal protection circuit which operates only if the inside tempera ture of the transformer rises over 145 C due to either a full power continuous transmission longer than 30 minutes or continuous operation in a high ambient temperature en vironment The protection circuit then locks the TL 922A in the STBY state The standby relay in your TL 922A can not be activated regardless of any switch setting protec tion has occurred it has likely been caused by a continuous run exceeding the rated capacity of the amplifier Leave the POWER switch ON to allow forced air cooling While cooling the exciter will operate straight through Protection lock will be released in approxima
28. tely 15 minutes Resume Amplifier operation with its power lowered appropriately 4 8 CARRYING YOUR TL 922A Your TL 922A weighs 31 kg 68 ibs To carry use the handles on the side escutcheons Do not slide or drop it as the plastic legs could be damaged Do not apply excess stress to the case When being transported repack the unit in its original shipping container as it was delivered upon purchase Whenever your TL 922A is likely to be subjected to vibrations during transport also remove the power tubes and repack in their original boxes See Fig 7 1 Packing for Shipment 5 1 The linear power amplifier in your T L 9224A is a grounded grid class AB amplifier consisting of two Eimac Hi mu zero bias triodes 3 500Z providing the following features 1 Low IMD intermodulation distortion through nega tive RF feedback 2 The grounded grid circuit does not require neutraliza tion 3 Due to its low input impedance no cathode swamp ing resistors are required 4 High stability at any frequency 5 Excitation energy is added to the RF output and is not lost Figure 5 1 shows a circuit diagram of the Linear Power Amplifier The input matching circuit comprised of L9 through 114 Cin 1 and Cin 2 matches the exciter im pedance with the input circuit impedance to efficiently feed exciter energy into the power tubes The tubes are heated by the center tapped filament transformer T2 requiring current only half the us
29. ual preventing voltage drop due to wire resistance The choke coils L20 and L3 high frequency isolate the filaments from the filament transformer The bias voltage which determines the operating point of the tubes is prod uced across zener diode D2 This diode carries the full cur rent of the tubes excepting filaments The grids are DC grounded through L7 and L8 and high frequency grounded by C28 through C33 HMD MD INED HD EE UD UAR HL UTE CULO UD HERD GRE UD OD CH UII QNID np dns SECTION 5 CIRCUIT DESCRIPTION The network comprised of VC1 14 5 2 matches the plate impedance to the antenna The tubes are cut off to stand by through a positive voltage of approxi mately 100 V applied to the filament circuit 5 2 POWER SUPPLY The plate high voltage is supplied from a voltage doubling rectifier comprised of a large capacity small sized trans former T1 fourteen high voltage rectifier diodes rated 800 PIV and eight 200 electrolytic capacitors rated 550 V surge To improve reliability the diodes are P C B mounted and the electrolytic capacitors are held by plastic spacers Filament voltage relay energizing voltage in common with the tube cut off bias voltage and pilot lamp voltage are supplied from transformer T2 Each primary of the power transformers T 1 and T 2 has two winding
30. ustable threshold 8V DC maximum output typical Eimac 3 5002 two pieces Diodes 18 pieces Zener diode 1 piece 120V 28A 240V 14A 50 60Hz for maximum SSB input Signal cable coaxial with UHF type connector 1 5m Control cable 1 5m 390mm x 190 mm x 407 mm 15 3 8 x 7 1 2 x 16 Net 31 kg 68 165 Shipping 38 kg 83 Ibs The above specifications are subject to change without notice due to technical im provement TL 922A is Class AB2 grounded grid linear amplifier developed by Trio Kenwood through ad vanced high power technology using two high per formance Eimac 3 500Z power tubes It covers all bands 160 m through 15 m for SSB CW and RTTY modes of operation Unprecedented Reliability The TL 922A is designed to provide stable high RF output power for extended periods of continuous use Engineered with Trio Kenwood s advanced circuit and mechanical technology the TL 922A employs two rugged 3 500Z power tubes to their full advantage Low Intermodulation Distortion Intermodulation distortion IMD is through the use of negative R F feedback minimized Quick Turn On Warm up is not necessary The 3 500Z tubes are fast heating Full Safety System To protect you against any possible high voltage elect ric shock your TL 922A has a double safety system comprised of interlocking switches One interrupts the high voltage primary circuit while the second directly grounds the s
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