ACOM 2000A User Manual (oper_man_eng_a2000)
Contents
1. ANTENNA Tl PLATE RELAY RX amp TX S1B C S1A CAPACITIVE DIVIDER C10 PLATE section Pl section L section HC 1 i 1 18 C20 1 C20 8 RF 1 5n 5kV 1 8MHz pos 1 8MHz pos 1 8MHz pos ne A C12A M R6 22k Ser PI COILS L COIL Hee A R9 m ie BW 2x220 3W L5 1 L5 2 L6 PLATE CHOKE 1 8 4MHz 7 30MHz 1 8 30MHz da V1 v2 j RFC5 FV1 4CX800A 4CX800A cad rear front 7 A LXACe 54 29 wew 9 3 53 ws AE 3 4 HlG PHASE i IN DETECTOR i l ON F JP1JP2 g2m G L1 2 4 6 ZS i on 235nH 46 3 i ra o t LED AA l Sop REC3 I ho k T RF l R1 10W C4 C5 C4 C7 10W ce C7 C9 1 i C12B C13 C14 WATTMETER 50 Ohm L2 100n 2 2n 6kV i 12 200p A0gpF 28 780pF 100W RF 795nH 63v i eI p 2v ES dr d edi heh hh Bbh qe Y l 2 2n 6kv CROWBAR a lo p 200pF 2AV SOOpFI2kV 400p jAV H Y l JP11 JP24 JP12 JP1 3 JPt4 JP2 3 JP2 E gt p i RE SECTION TUBE DECK Y 4 LOAD CAPACITOR HTR R htrvmi 13 5V 13 5V HTR F 340VR 340V EXHAUST 2850V TEMPERATURE A SENSORS HA 1 E Frequency counter HT L meas cont M3 TUNE CAPACITOR HV TRANSFORMER pins view ON OFF a any 5 20V 20V 20V om aw 1 1004F 35V T1 f POWER wE HV 1 de I TRANSFORMER HV i I Ll M Yi 4 HV SW1 JP1 2050V GND POWERON M1 EXT DC FAN conrol m E HV OPTIONAL SW FILTER 4 1 COVER INTERLOCK12. 24VST M2 INT BLOWER MOTOR DRIVER MAINS CONSOLE sockets view T2 1 LV TRANSFORMER 100 120VAC 200 240VAC 56V SUE MAINS 1 YELLOW GREEN 9 RFCI 18V LOW VOLTAGE 20A SUPPLY MAINS 2 20V 10 5V MAINS CONTROL T amp VOLTAGE SELECTOR JP6 AC LINE CORD o e e o 10 To HEATERS GU 74B 4CX800A BOTTOM VIEW 18VEXT SVEXT 132V 10V 24V 48V Q sw3 COVER JPS o INTERLOCK2 POWER SUPPLY MOTORS MEASURE amp CONTROL JP1 SENSORS ACON2DBBA REMOTE CONTROL Rem Contr REMOTE U CENTRAL PROCESSOR SIGNAL INTERFACE RS 232 FILTER ANTENNA SELECTOR ORPC INTERPACE MEASURE alc level 1 8MHz position S1A S1B S1C S1D front view rear view front view front view J1 J2 J3 KEY IN KEY OUT ALC aca RCA RCA QSK PROCESSOR Fig 6 1 ACOM2000A Simplified Schematic Diagram
3. If the amplifier remains in the SERVICE sub menu for more than 5 minutes without any further RCU input it will return automatically to the MAIN menu For more information see the TECHNICAL SUPPLEMENT 5 4 CAT SETTINGS Here you set the type of the transceiver connected by CAT to the amplifier Use the UP and DOWN buttons to move the pointer and exit with SET EXIT button Pay attention to the communication speed shown in the brackets next to each transceiver type Set your transceiver serial port to the same Baud rate speed 26 gt ACOM 19200 ELECRAFT K3 38400 FLEX PowerSDR 57600 ICOM TT OMNI VI 19200 KENWOOD NEW 19200 KENWOOD TS 850 4800 TEN TEC ORION 57600 TEN TEC OMNI VII 57600 YAESU FT 1000MP 4800 YAESU FT 1000D 4800 YAESU FT 897 4800 YAESU NEW 19200 E Fig 5 5 RCU display CAT SETTINGS A transceiver that is not included in the list still could be CAT connected to the 20004 if its protocol is compatible with any of the listed transceivers Select KENWOOD NEW if your transceiver is TS 570 TS 870 TS 480 TS 590 TS 990 TS 2000 or newer KENWOOD TS 850 covers also TS 950 as well as TS 440 TS 940 with optional units YAESU FT 1000D can be selected for some FT 1000 and FT 990 versions YAESU FT 897 covers also FT 847 FT 857 and FT 817 YAESU NEW includes FT 450 FT 950 FT 2000 FT 3000 FT 5000 and FT 9000 or newer 5 5 MORE SETTINGS Some more items can be set through this menu
4. FORWARD POWER kW 0 03 01 02 03 0 4 05 06 08 zi 7208 LOCK LOCK UNLOCK GAIN LOW NORMAL HIGH CLEAR THE SEGMENT TUNING fES NO DISPLAY BRIGHTNESS SOUND Fig 5 6 RCU display MORE SETTINGS 27 a LOCK Once locked through this option the amplifier can be switched on but it will not turn into OPERATE state until entering the same menu and choosing UNLOCK This feature is intended to protect the amplifier from children or from other persons not familiar with the equipment The locked state is indicated by a displayed image of a key b GAIN NOTE Inappropriate use of this function may reduce the gain or the maximum undistorted output power In fact this selection controls the tubes plate load resistance achieved by AUTO TUNE procedure When HIGH is selected a next AUTO TUNE will result in a higher than nominal load resistance thus there will be more gain but less maximum attainable output power When available drive power is insufficient or when less output but better efficiency are needed e g for RTTY and SSTV this may be desirable and you may select HIGH also at a nominal mains voltage condition Selecting LOW would lead to the opposite result i e lower than nominal load resistance less gain and more power attainable Of course this requires more drive power more plate current and more plate heat which shortens tubes expected life We do not recommend this selection at normal mains voltage and never a
5. selector antenna and grounding for loose contacts or worsened insulation AUTOMATIC PROTECTION power not removed more than 10 seconds DRIVE POWER REMOVED after the message REMOVE AND REDUCE DRIVE POWER appeared BAND SWITCH SYSTEM MALFUNCTION OFF5 BIAS CONTROL MALFUNCTION OFF5 CCC BIAS TOO LOW AT POWER ON OFF5 CCC BIAS VOLTAGE TOO LOW OFF5 CCC CAT CONNECTION FAULT Check the CAT cable the CAT settings and the transceiver CAT settings COVER INTERLOCK OPEN Check cover OFF5 DETECTED RF POWER AT WRONG TIME Check if there is power in the antenna induced from another nearby transmitter CCC OFF5 FREQUENCY VIOLATION submit to your dealer your license for opera tion in the respective frequency band 37 FRONT TUBE EXHAUST TEMP TOO HIGH check if air intake rear panel and exhaust above tubes openings are clear of obstructions RD amp T HV TOO LOW AT POWER ON check if the power transformer is properly connected see S 2 3 CMV Ip PRESENT SHOULD BE ZERO OFF5 INPUT RELAY CLOSED CCC OFF5 IT SHOULD BE OPEN LOAD CAPACITOR SYSTEM MALFUNCTION OFF5 LOSS OF STORED DATA see S 8 2 CHECK BATTERY PLEASE LOW BATTERY DATA IS IN DANGER LOW AIRFLOW check if air intake rear panel and exhaust above tubes openings are clear of obstructions RD amp T RD amp T check the coaxial cable from transceiver output to amplifier input check if the power transformer is properly connected see
6. INPUT DRIVE RF POWER EXHAUST AIRFLOW TEMPERATURE FRONT TUBE EXHAUST AIRFLOW TEMPERATURE REAR TUBE FILAMENT CURRENT FRONT TUBE FILAMENT CURRENT REAR TUBE FILAMENT VOLTAGE GRID BIAS VOLTAGE GRID DC CURRENT LAST FREQUENCY USED LOAD ANTENNA VOLTAGE STANDING WAVE RATIO LOAD ANTENNA FORWARD POWER MAINS INPUT VOLTAGE PLATE DC CURRENT PLATE HIGH VOLTAGE VALUE POWER REFLECTED FROM LOAD ANTENNA PLATE RF AMPLITUDE PEAK VALUE SCREEN DC CURRENT SCREEN DC VOLTAGE 5 3 SERVICE procedure The procedure SERVICE can be selected and used only in STB mode It is used for adjustment of the zero signal plate current and the optical sensors disks during repair We recommend this procedure to be carried out only by a trained service technician FORWARD POWER kW 0 03 01 02 03 0 4 0 5 0 6 2100 7200 me LOAD MOTOR STEP 87 OPTOSENSOR LIGHT ES CA E CA Fig 5 4 RCU display SERVICE When selecting TUNE LOAD or BAND the respective motor can be moved step by step CCW or CW with the left and right arrow buttons The positions of the motors are shown in a numerical and in a graphical form The status LIGHT or DARK of the respective optical sensors are also displayed When the BIAS function is activated it starts an automatic switching queue over three different grid bias voltages The voltages are shown along with the respective measured DC plate current This is used when the tube idling current adjustment is required
7. S 2 3 CMV QSK BREAK in FAULT OFF5 CCC rocesconconruct 0 Pm REAR TUBE EXHAUST TEMP TOO HIGH check if air intake rear panel and exhaust above tubes openings are clear of obstructions RD amp T 38 REFLECTED POWER TOO HIGH check antenna cable selector antenna and grounding for loose contacts or worsened insulation trim the antenna for minimum VSWR or use an antenna tuner try another antenna check if REFLECTED POWER is induced from another nearby transmitter REMOVE AND REDUCE DRIVE POWER RD amp T RF PLATE V SHOULD BE ZERO OFF5 CCC RF GRID W SHOULD BE ZERO OFF5 CCC SCREEN VOLTAGE ON OFF5 BEFORE TIMEOUT OVER TUNE CAPACITOR SYSTEM MALFUNCTION OFF5 5V TOO HIGH TOO LOW CMV 12V TOO HIGH TOO LOW CMV 24V 48V TOO HIGH TOO LOW CMV Abbreviations OFFS5 Turn the amplifier off for 5 minutes and try again RD amp T Reduce drive power from transceiver do AUTO TUNE see S 4 2 CMV Check the mains voltage and verify that it matches the voltage selector see S 2 2 and table 2 1 CCC Check the control cable from the transceiver to KEY IN input see S 2 4 9 SPECIFICATIONS 9 1 Parameters a Frequency Coverage All amateur bands 1 8 29 7MHz b Power Output 1500W PEP or continuous carrier no mode limit In continuous carrier modes RTTY etc for transmissions longer than 15 minutes up to several hours depending on ambient temperature the opti
8. otherwise be possible with other amplifiers The amplifier is capable of memorizing up to 10 different antenna tunings for each frequency segment irrespective whether they are for different antennas or for different environment conditions for example wet and dry weather on the same antenna NOTE REFLECTED POWER readings and the measured VSWR depend on the load impedance only and not on the amplifier tuning If the impedance is different from the nominal 50 Ohm pure resistive the REFLECTED POWER bargraph will always indicate the reflected power presence even at actual USR tuning The proper USR tuning will however allow you to operate with greater power without distortions and danger to the amplifier The real power in the load is equal to the difference between the FORWARD and REFLECTED bargraph readings For instance at indicator reading for FORWARD 1775W and for REFLECTED 275W the real output power is 1500W At very high VSWR lack of antenna or shortened antenna the FORWARD and REFLECTED readings will be almost equal while the real output power the difference between them will be practically zero The amplifier can operate safely if the following rule is obeyed REFLECTED POWER 500W Matching can be assured for loads with VSWR up to 3 1 for 160m 2 1 Nevertheless for some loads matching is possible even at higher VSWR 19 CAUTION Using a feeder of coaxial cable at VSWR gt 3 1 on HF bands is not recommen
9. power transformer will be mounted There are several individual purchase options available They are 1 An auxiliary EXTERNAL FAN for continuous modes of operation rear panel mount 2 CAT CABLES for connection to the supported transceivers 3 The TECHNICAL SUPPLEMENT to this manual containing electrical diagrams technical details on operation and maintenance as well as a list of command set and local network rules for RS232 operation The Automatic antenna selector ACOM 2000S and Remote antenna switch ACOM 2000SW are especially designed to complete your ACOM system 1 4 Features Automated matching of the antenna impedance to the optimum load of the tubes during initial preparation of user tunings Easy to operate No operator intervention is required when changing antennas or frequency Thus the risk of inadvertent errors such as incorrect antenna selection or failure to change band switch is eliminated 3 TFT color display All amplifier status indicators and comments are presented on the Remote Control Unit RCU display The HELP sub menu gives on board technical assistance and troubleshooting suggestions power on elapsed time hours etc Two color strips display peak forward and reflected power Indicators are provided for OPERATE STANDBY and for fault conditions Easy maintenance Information on the amplifier s internal status is stored in an INFO BOX for the 12 most recent protection faults This information
10. transceiver has not such an input don t worry the amplifier will function normally as well and then the KEY OUT may remain unused 10 NOTE If there is a CAT connection between your amplifier and your transceiver which carries also the KEY OUT signal you don t need a separate KEY OUT cable Please see section 7 f Connect the supplied DB9 DB9 2RCA control cable between the RCU connector marked AMPL and the amplifier REMOTE CONTROL connector Plug in the two Phono connectors marked KEY IN and KEY OUT to the respective amplifier sockets Screw in the knurled screws 9 To control the amplifier via CAT you will need a special cable from the transceiver to the High Density HD 15 connector on the RCU rear panel marked CAT The HD 15 pinout and cable diagrams for various transceivers are shown in section 7 The cable can be supplied as an option with the amplifier or purchased separately or you can assemble your own Check with your dealer for cable options for your transceiver h Automatic antenna selector ACOM 20008 can be connected to the respective connector on the RCU rear panel i The ALC output of the amplifier normally remains unused In case of need of ALC for your transceiver which we do not recommend you may contact your dealer or see the TECHNICAL SUPPLEMENT j The connector on the amplifier rear panel marked RS232 INTERFACE remains unused until you decide to use the amplifier with a computer or in a local network as de
11. valid for the antennas at the old location Of course if the total number of antennas is less than 10 per segment you can do USR tunings with new antenna numbers and thus preserve the USR tunings for the antennas at the old location as well 30 6 6 CLEAR THE MEMORY NOTE Erasing Nonvolatile Memory erases all user data for the amplifier stored in its nonvolatile memory and the INFO BOX This includes the following the elapsed hours on is set to zero the text set for CALL is deleted the information stored for recent 12 protection trips is cleared selection for LOW NORMAL HIGH of GAIN is set to NORMAL the amplifier self address in local network is set to 01 the last segment and antenna in use is set to 1800 1825 ANT1 all USR tuning settings for all segments and antennas are set to DEFAULT the auto antenna change mode is set to ON the AUTO OPERATE selection is set to OFF If you are fully convinced that you want all of these actions to take place choose YES and then leave the menu pressing the SET EXIT button The procedure is now completed and the amplifier remains in OFF state with no user data in it The serial numbers of the RCU amplifier and its tubes as well as the firmware revision code and DEFault tuning settings however are preserved NOTE After this procedure set new data in OFF menu and update the USR tunings for the frequency segments and antennas to be used see S 4 1 T CAT OPERAT
12. 00m above sea level without output deterioration 9 2 Functions a Load Impedance Matching Process automated b Provides Antenna Control Interface for Automatic Antenna Selector and Tuner c User tuning settings memory nonvolatile for up to 10 antennas per frequency segment settings for 50 Ohm default provided d Tubes two 4CX800A GU74B TY74B Svetlana CBernaua high performance ceramic metal tetrodes with plate dissipation of 800W each grid driven forced air cooling e T R System QSK operation with built in vacuum RF antenna relay f Protections cover interlock for operator s safety inrush power on current control all supply voltages control grid screen grid plate and heater currents 40 cooling airflow exhaust air temperature each tube separately motors motion T R sequencing antenna relay contacts including RF power induced in antenna from another nearby transmitter load matching quality reflected power RFarcs including in antenna system overdrive unauthorized access to amplifier g INFO BOX for 12 recent protection trips default selections individual amplifier s data and elapsed power on hours h Up to 20 meters separation between the RCU and the main unit on board assistance and troubleshooting suggestions etc No controls on main unit except for the ON OFF main switch and LED indicator i All functions accessible from a computer via ser
13. 08 70027200 2 ANT 2 4 EL YAGI CAT ACOM USER Fig 5 1 RCU display MANUAL MODE HEATER PLATE DRIVE Now you have access to some functions procedures and settings which are marked on the soft key prompting labels 5 1 MANUAL TUNE CAUTION During the manual tune process be certain to keep transmissions to less than 3 minutes in duration and leave pauses of 1 2 minutes between transmissions for cooling of the tubes If for some reason you prefer to match the antenna impedance manually you can do so through the MAN TUNE procedure The procedure starts the same as for AUTO TUNE but you will need to adjust the LOAD and TUNE settings yourself as described below 23 FORWARD POW 0 03 0 1 0 2 0 3 05 0 6 7100 7200 me ANT 2 4EL YAGI DEFAULT SERTE OIE gt gt gt gt gt Fig 5 2 RCU display MANUAL TUNE In figure 5 2 graphical representations of the physical positions of the Tune STEP 101 and Load STEP 35 capacitors are depicted above their respective TUNE and LOAD dual arrow adjustment buttons The arrows indicate which way the automatic procedure would move the motor they are correct only at drive power of 5 to 50W By pressing the left and right arrow buttons you can increase or decrease the step number which in turn moves the motors and capacitors To end the manual tune procedure and save the tuning as USER remove drive power and press the SAVE button If you decide to leave the procedur
14. 32 gt a cn S l Ja 2 x 510 Ohm TO ACOM 2000A CAT CONNECTOR Fig 7 3 CAT Connection to ICOM CI V interface KENWOOD TS480 TS570 TS590 TS870 TS2000 TS 40 with optional unit or TS 50 with optional unit You need a female DB9 connector and a three conductor shielded cable The wiring should follow Fig 7 4 including the connection between pins 7 and 8 of the DB9 connector If the same port of the transceiver is used for computer control you can use Y cable shown on Fig 7 2 with an addition of a connection between pins 7 and 8 at the transceiver side TO KENWOOD RS 232 CAT CONNECTOR TO ACOM 2000A CAT CONNECTOR Fig 7 4 CAT Connection to KENWOOD RS 232 interface KENWOOD TS450 TS850 and TS950 If an optional RS 232 interface is present you may use the cable of Fig 7 4 Otherwise the built in TTL serial interface can be used as shown on Fig 7 5 Use shielded cable and universal low power NPN transistors TO ACOM 2000A CAT CONNECTOR TO KENWOOD TTL PORT Fig 7 5 CAT Connection to KENWOOD TTL interface Elecraft K3 You can use a shielded cable wired according to Fig 7 6 The RS 232 connector at the transceiver side is a male DBO9 If the same port of the transceiver is used for computer control you can use Y cable shown on Fig 7 2 33 TO K3 CAT CONNECTOR TO ACOM 2000A CAT CONNECTOR Fig 7 6 CAT Connection to Elecraft K3 YAESU FT450 FT847 FT920 FT950 FT1000MP FT2000 FT5000
15. COM LOOOR AUTOMATIC HF LINEAR AMPLIFIER OPERATING MANUAL D ACON ACOM OOD Blvd Nikola Mushanov 151 1330 Sofia Bulgaria phone 359 2 920 96 55 fax 359 2 920 96 56 e mail acom acom bg com acom mail orbitel bg www acom bg com QO ACO Table of Contents 1 GENERAL INFORMATION 2000 2 eee 3 1 1 Introduction and Description 20 vocal daa ida 3 152 COOWnBI ASSISIBIICB 22 2 euer TP peas ceste ES prada Ee 3 1 3 Equipment Supplied and Options liliis 3 T4 ESaIBIBS 3a pues cnet ake chee oa pu arcis Ro afud he 3 1 5 Safety Considerations Explicit Definitions 4 2 INSTALLATION cae exa e EAS E REIR RR C CE 6 2 1 Unpacking and Initial Inspecti0N o o ooooooooo 6 2 2 Line Voltage SelecliOFi ia ia ea oc ee Fee m e e ini 6 2 3 Transformer Installation 22 a conem g Ace foe e e op anie 7 2 4 COnnectiors vos busta cau ded toos oie adusta deci ados 8 2 5 Installation of Optional Fan 0000 cee 12 3 POWER ON RCU CONTROLS INDICATORS AND MENUS 12 4 AUTO MODE Locus ordi Gis ee ees R IC RR ERI DUE Re 15 4 1 MAIN MENU Si AEUEEUS QU IOPUPERS CRUS 15 4 2 AUTO TUNE procedure 0 220 elles 19 4 3 Erasing USER segments return to DEFAULT tunings 22 5 MANUAL MODES 4 vv Eye REL LEVPVELYR a 23 5T MANUAL TUNE nme a qe oer te Dr So ees ORO 23 5 2 MEASURE 1URCHOR 35 rore eU EN EE S vam MIS RE 24 5 9 SERVICE p
16. H340mm 18 3kg Transformer carton W630mm x D590mm x H300mm 20 7kg Amplifier carton c Shipping environments all types of transportation including aircraft baggage section up to 12000 meters above sea level 10 BRIEF MENU GUIDE POWER SWITCH OFF STATE HELP to read serial numbers power on hours suggestions SET EXIT BUTON gt OFF MENU CALL SIGN to change display message while in OFF state AUTO ANTENNA CHANGE to select the logic of the antenna change AUTO OPERATE to select the behaviour of the amplifier after a soft fault SELF ADDRESS to select the address of the amplifier if used in a network CLEAR THE USER TUNINGS to delete all USR tunings CLEAR THE MEMORY to delete all stored data ON OFF BUTTON gt MAIN MENU gt OPR STB BUTTON to activate and use the amplifier AUTO TUNE to match antennas USR tunings preparation e SET EXIT BUTTON gt MANUAL MODE MANUAL TUNE to match loads manually MEASURE to measure various amplifier operating parameters SERVICE to check motors motion and tubes zero signal current CAT SETTINGS to tell the amplifier what transceiver is connected to it via CAT MORE SETTINGS LOCK to protect the amplifier from unauthorized users GAIN to define mains voltage excursions 42 CLEAR THE SEGMENT TUNING to erase a single segment USR tuning DISPLAY BRIGHTNESS SOUND ANTENNAS to set the antennas names ON OFF BUTTON back to OFF STATE END QO ACO
17. Hz has automatic self tune capability and provides up to 1500W output power with less than 60W exciter drive The amplifier can tolerate loads up to 3 1 VSWR 2 1 on 160 meters and the process of matching the antenna impedance to the optimum load of the tubes is automated It features a Remote Control Unit RCU contains nonvolatile memory for settings on up to ten different antennas per frequency segment and offers command capability for use with an external automatic antenna selector and or automatic antenna tuner Transmit receive switching is capable of full break in operation QSK via an internal vacuum relay All indicators and controls except the primary mains switch and indicator are available via the Remote Control Unit RCU All command input to the RCU is menu driven 1 2 Owner Assistance If assistance is needed you should contact your local dealer If necessary your dealer will contact ACOM for additional guidance If you still have an issue you need to discuss with one of ACOM s specialists the contact information is as follows fax 359 2 920 96 56 e mail acom acom bg com acom mail orbitel bg or by mail blvd Nikola Mushanov 151 1330 Sofia Bulgaria 1 3 Equipment Supplied and Options The ACOM 2000A amplifier is shipped in two cardboard cartons One carton contains the power transformer the second carton contains the amplifier The remote control unit RCU is shipped inside the amplifier in the area where the
18. ION AND CONNECTIONS Most of the modern transceivers that have the operating frequency data available on an auxiliary serial port could be connected to Acom2000A by means of a CAT connection This will enable the amplifier to track the frequency of the transceiver and to tune up automatically when entering a new segment without transmitting Because of the variety of CAT protocols the amplifier response could vary when used with different transceivers Some older transceivers use very slow protocol and send the frequency data with delay up to few seconds The amplifier s response will also be delayed In some cases when the transceiver is turned ON after the amplifier you may need to actuate the RCU CAT FREQ button in order for the radio to announce its frequency In other cases the transceiver sends the frequency data only when the frequency changes You may have to move its main dial or change its frequency by another way to let the amplifier know the transceiver frequency after the initial power ON 31 Not all transceivers correctly report VFO A and VFO B when in split mode If your transmit and receive frequencies are in different band segments and the amplifier retunes on every RX TX transition turn off the CAT until the end of the split operation The CAT connector is located on the RCU rear panel Besides the RS232 and TTL compatible serial interface the CAT connector also carries the KEY IN and KEY OUT lines which can be used inst
19. RD which are not to be replaced by the user Should one of these fuses be blown it may be indicative of other more serious failures This is a complex and possibly dangerous operation For this reason we recommend this work be carried out by a trained service technician See the TECHNICAL SUPPLEMENT for details 8 4 Tube Replacement New tubes must be supplied as a Matched Pair with close electrical characteristics Otherwise there may be an imbalance and one of the tubes will bear an excessive share of the operating current which can lead to overheating and reduced tube life Two 4CX800A GU74B l Y745b high performance ceramic metal tetrodes manufactured by Svetlana CBernaua are employed in the amplifier Tube replacement is a complex and possibly dangerous operation For this reason we recommend that this work be carried out by a trained service technician See the TECHNICAL SUPPLEMENT for details 8 5 The ACOM2000A Simplified Schematic Diagram See Fig 6 1 ACOM2000A Simplified Schematic Diagram The two 4CX800A GU74B 1Y74b Svetlana CaBernana high performance ceramic metal tetrodes V1 and V2 with plate dissipation of 800W each are grid driven The input signal from the RF INPUT jack is passed through a broadband input matching circuit which is comprised of components in the PHASE DETECTOR PCB and also L1 L2 C2 C3 and R1 This circuit tunes out the input capacitance of the tubes The resistor R1 is a termination load of this cir
20. TUNE 20 The amplifier will wait for you to apply between 10 and 20W continuous CW carrier signal on the desired frequency If you don t begin transmitting within 40 seconds the amplifier will return back to the MAIN menu The automatic matching process starts the moment power remains constant within the indicated boundaries This is shown by the bottom bar graph which indicates the applied input power and glows in green PLEASE APPLY 10W TO 20W DRIVE POWER If the drive power is less than 10W or greater than 20W the yellow arrows will remind you to correspondingly increase or decrease the drive W 10 2 PLEASE APPLY 10W TO 20W DRIVE POWER The antenna impedance matching process is completed in less than 3 seconds and AUTO TUNE COMPLETED PLEASE REMOVE DRIVE message is displayed as shown in figure 4 5 and the letter S is being sent in CW FORWARD POWER kW 0 03 0 1 0 2 0 3 0 4 7100 7200 e AUTO TUNE COMPLETED PLEASE REMOVE DRIVE Fig 4 5 RCU display end of AUTO TUNE NOTE If the KEY OUT control is used see S 2 4e the above message will be skipped Iffor some reason matching cannot be accomplished successfully for example excessive VSWR or unstable drive power during tune up the process ends up with the choice of DEF tuning and you will hear K being sent in CW 21 FORWARD POWER kW 0 03 01 02 03 0 4 E A ANT 2 4EL YAGI DEFAULT Fig 4 6 RCU display AUTO TUNE fail After remo
21. and FT9000 You need female DB9 connector and a three conductor shielded cable The wiring should be as shown in Fig 7 7 If the same port of the transceiver is used for computer control you can use Y cable shown on Fig 7 2 TO YAESU RS 232 CAT CONNECTOR TO ACOM 2000A CAT CONNECTOR Fig 7 7 CAT Connection to Yaesu transceiver with RS 232 interface YAESU FT 990 FT 1000 and FT 1000D You will need a 6 pin DIN connector 3 wire shielded cable and a 10k pull down resistor as shown on Fig 7 8 TO ACOM 2000A TO FT 1000 CAT CONNECTOR CAT PORT Fig 7 8 CAT Connection to YAESU FT 1000D YAESU FT 817 FT 857 and FT 897 The cable is shown in Fig 7 9 Besides the serial interface wires also the amplifier control lines are included in the same connector This makes possible using of a single cable between the transceiver and ACOM2000A as shown on Fig 7 9 The connector at the transceiver side is a Mini 8 pin DIN You will also need a 5 wire shielded cable and a 10k pull up resistor In case of using this cable you should not connect separate cables to the KEY IN and KEY OUT sockets described in s 2 4 d e 34 TO ACOM 2000A CAT CONNECTOR Fig 7 9 CAT Connection to YAESU FT 897 8 MAINTENANCE WARNING HIGH VOLTAGE The amplifier works with high voltages up to 3000V which are LETHAL For your safety pull the amplifier power plug out ofthe mains wall outlet and WAIT AT LEAST 30 minutes EACH TIME BEFORE you remove the
22. and antenna in Figure 4 2 DEFAULT is shown indicating as factory programmed The amplifier may also be user tuned by means of the AUTO TUNE procedure as explained in Section 4 2 Next to the tune type there is an indication for operate OPR or Standby STB mode At the bottom right there are three indicators available which warn you with yellow light when the heater voltage the plate current or the drive RF power are approaching their limits c ON AIR Ifthe VSWR ofthe antenna is acceptable below 1 5 1 or you have fresh USER TUNINGS readily prepared see S 4 2 you may start operating the amplifier immediately after pressing the OPR Operate button The label STB on the display changes to OPR and you may transmit The bar graph on the upper line indicates the power fed into the antenna forward power and the smaller bar graph below the power reflected from the antenna RFL The difference between 17 the two is the real output power delivered from the amplifier The red TX sign illuminates See fig 4 3 whenever KEY IN input is keyed i e the transceiver goes into transmit mode If the CAT connection is active and the amplifier is in OPERATE mode it will continuously track the transceiver frequency and will automatically tune up when entering a new segment If there is no active CAT connection to the transceiver and you start transmitting on a frequency different from the indicated segment and the amplifier is in OPERATE mod
23. ange only the settings stored in the amplifier memory for each antenna e TURNING OFF In order to turn the amplifier off press the red ON OFF button on the RCU If you are not going to use the amplifier for a long time more than 30 minutes it is best to turn off the amplifier using the Main Power switch on the main amplifier chassis as well 4 2 AUTO TUNE procedure 8 Let us examine the difference between the two types DEFAULT and USER tunings DEFAULT tuning settings are permanently available in your amplifier memory They are normally used when the load VSWR at the input end of the feed line is very low Real loads often have VSWR greater than 1 5 1 which usually requires the use of an outboard antenna tuner Your amplifier will perform adequately with up to a VSWR 3 1 or up to 2 1 on 160m if you prepare USER tunings This is a fully automatic procedure of matching the real load impedance to the optimum tubes load Note This is NOT equivalent to using an external antenna tuner and does not change the SWR your transceiver will see when the amplifier is in STB mode User tuning settings are memorized and stored in a nonvolatile memory They will be retrieved automatically each time you change the operating frequency or antenna number as described in the previous section This may enable you to use the amplifier without an outboard antenna tuner over a wider frequency range and to change frequencies and antennas faster than would
24. can be read directly from RCU display by the operator Less QRM improved Electro Magnetic Compatibility during tuning Retuning can be achieved in three ways manually via the RCU by the transceiver s CAT system or with a very short transmission a single word on SSB or a dot even at 40 wpm on the new frequency is enough to change bands or segments automatically in a second Also the initial process of user tuning settings preparation is done in less than three seconds at a quarter of nominal output power Saves space on the operating table Since the amplifier is controlled by the RCU the main unit can be located up to 20 meters 65 feet from the operating position The supplied 3 meter 10 ft cable may be easily extended to the needed length Operates automatically without special signals from the transceiver ground on TX PTT and 60W RF drive power are sufficient to control and operate the amplifier CAT connection to most transceiver models Broadband input matching circuit resulting in very good load to the transceiver over the entire short wave spectrum e Uses two 4CX800A GU74B 1 Y74b Svetlana CBetnana high performance ceramic metal tetrodes with plate dissipation of 800W each forced air cooling grid driven ACOM maintains strict adherence to the tube manufacturer s specifications for cooling and for the sequence of applying and removing the different tube voltages Starting filament current is limi
25. cover of the amplifier Do not touch any part inside while the amplifier is open as some residual voltages may still be present 8 1 Cleaning WARNING Do not use solvents for cleaning they may be dangerous both for you and for the amplifier paint Do not open the amplifier Cleaning of the amplifier and RCU outer surfaces can be done with a piece of soft cotton cloth lightly moistened with clean water 8 2 Backup Battery Replacement If the RCU displays a message LOW BATTERY DATA IS IN DANGER or LOSS OF STORED DATA CHECK BATTERY PLEASE it is necessary that the nonvolatile memory battery for USR TUNINGS be replaced This is a 3V 38mAh coin type lithium battery with a diameter of 12mm 1 2inch with leads for soldering The following types are suitable BR1225T2 1 made by RAYOVAC USA BR1225 1HC made by PANASONIC This is a complex and possibly dangerous operation For this reason Acom recommends that this work be carried out by a trained service technician See the TECHNICAL SUPPLEMENT for details The expected life of a new battery is at least 5 years 8 3 Fuse Replacement If circumstances require replacement of the mains fuses use only standard ones The two Primary Mains Fuses of the amplifier are located on the rear panel Fig 2 2 They are 20A 250V Quick blow 1 1 4 x 1 4 inch Cartridge Fuses Size 0 Ceramic Besides these primary fuses there are six small glass fuses 5x20mm on the MAINS CONTROL 35 BOA
26. croprocessor as the main system and the Z86E04 Zilog single chip microprocessor which is used as the antenna relay QSK controller They are interfaced through the INTERFACE PCB to all other circuits All voltages delivered from the LOW VOLTAGE and HIGH VOLTAGE SUPPLY PCBs tube currents temperatures and airflow cooling capability are permanently monitored Numerous software derived protection limits are based on this information The SIGNAL FILTER PCB and RFC1 eliminate RF feedback from incoming cables including the 36 mains power cord The Remote Control Unit RCU is based on the ATmega64 microcontroller and uses a 7 color TFT display Detailed electrical schematic diagrams are available in the TECHNICAL SUPPLEMENT Contact your dealer for details 8 6 Troubleshooting Should the RCU display indicate a problem look up the message in the list below and before you contact the service of your dealer see S 1 2 and S 5 3 try the recommendations The messages are listed in an alphabetic order The abbreviations used for some recommendations are decoded after the list In case of necessity of transportation see S 9 3 MESSAGE RECOMMENDATION ADC OVERFLOW OFF5 ANTENNA CONTROL UNIT MALFUNCTION check the control cable from the amplifier INTERFACE connector to ACU Antenna Control Unit if there is one ANTENNA RELAY CLOSED IT SHOULD BE OPEN ANTENNA RELAY OPEN IT SHOULD BE CLOSED ARC FAULT try again check antenna cable
27. cuit and can dissipate up to 100W of drive power Cathode resistors R2 and R5 create DC and RF negative feedback and equalize the gain of the tubes The varistor RV1 in the screen grid circuit protects the tube screen grid and voltage regulator in the events of a flashover The combinations of L3 R3 and L4 R6 in the plate circuits are the VHF UHF parasitic suppressors DC plate voltage is fed through chokes RFC2 RFC3 and the capacitor C10 blocks it from the output The output circuit is comprised of L5 L6 and C12 C16 which form a classic Pi L network and suppresses harmonic frequency emissions It is switched and tuned over the bands by S1A S1D and the stepping motors M3 M5 via the MOTOR DRIVER PCB The output signal is fed through the vacuum antenna relay K1 wattmeter current transformer TA1 and high pass filter RFC5 C20 and finally to the antenna output The chokes RFC4 and RFC5 keep track of the antenna relay contact condition and together with C20 prevent the plate supply from reaching the antenna and RFC5 shunts it to ground if the DC blocking capacitor C10 fails The resistor R9 and FV1 protect the amplifier from static discharge via the RF OUT connector The PHASE DETECTOR together with the PLATE CAPACITIVE DIVIDER RF WATTMETER and three OPTOSENSOR circuits are the main sources of information for the control circuit of the amplifier during the autotune process The control circuit consists of the CENTRAL PROCESSOR UNIT based on the 80C31 mi
28. ded At such high values of VSWR the high voltages high currents and heat associated with line losses risk permanently damaging the coaxial cable Always prefer USER to DEFAULT tunings and update them periodically in particular when you install a new antenna or when a significant change in the environment occurs snow ice newly appeared or removed massive objects power lines etc that would cause significant changes in the antenna impedance b Procedure for preparation of USER tunings We recommend that you prepare USER tunings for the center frequencies of the segments but you can do them for other preferred frequencies NOTE If you use more than one antenna per segment it is necessary that you select the proper antenna number see S 4 1d BEFORE the next step Otherwise you may overwrite some useful tuning for another antenna number The following instructions are valid if your amplifier is not connected to the transceiver by CAT or the CAT connection is of RX only type which is rare but possible if there are other devices connected via Y cable If there is a two way CAT connection between the transceiver and ACOM2000A skip to para 4 2c To begin AUTO TUNE while in the MAIN menu press the TUNE button and you will see the following display FORWARD POWER kW 0 03 0 1 0 2 03 04 05 06 08 TO 12 1 4 7100 7 200 lec ANT 2 4EL YAGI DEFAULT PLEASE APPLY 10W TO 20W DRIVE POWER Fig 4 4 RCU display AUTO
29. e it automatically senses your operating frequency selects the corresponding segment and tunes up on it This retuning takes less than one second and you are immediately ready to operate on the new band Example FORWARD POWER kW 003 01 02 03 0 4 3 650 3 700 me ANT3 AUTO DIPOLE CAT ACOM ATER ATE RIV USER PLATE DRIVE BAND SEGMENT ANTENNA w ms mu dim Fig 4 3 RCU display Main Menu during transmission In the example a signal frequency between 3650 and 3700kHz was applied and antenna No 3 named DIPOLE was last used there with tuning done by the user NOTE Ifin the OFF menu see S 6 2 AUTO ANTENNA CHANGE is set to OFF then the antenna number would not change A new frequency segment can be selected in three ways as mentioned above by the CAT system by the internal frequency counter after a short duration transmission from the transceiver with the amplifier in OPR mode a single word in SSB or a dot in CW even at 40 wpm would be enough manually in the MAIN menu by selecting the desired segment by means of the BAND SEGMENT up and down buttons You can select the automatic segment change mode by means of the CAT FREQ leftmost button d A new antenna can be selected while in the MAIN menu by the means of the ANTENNA up 18 or down buttons If you don t have the Automatic antenna selector ACOM 2000S and ACOM 2000SW remote antenna switch installed pushing these buttons would ch
30. e without overwriting the current tuning push the SET EXIT button If you adhere to the tune up criteria following the arrow prompts you will achieve the same results as AUTO TUNE Because of this the MAN TUNE procedure is only appropriate if you have tune up criteria of your own We recommend you use the AUTO TUNE procedure instead 5 2 MEASURE function The function MEASURE controls the technical state of the amplifier and the parameters associated with it The TFT display is divided into two equal display areas and in either you can monitor any of the 20 parameters provided for measuring for example GRID BIAS VOLTAGE and DC SCREEN VOLTAGE 24 FORWARD POWER kW 0 03 01 02 03 04 7 100 7 200 C user o D EXH AIR TEMP REAR PLATE HIGH VOLTAGE FIL CURRENT FRONT PLATE RF PEAK FIL CURRENT REAR REFLECTED POWER FILAMENT VOLTAGE SCREEN DC CURRENT GRID BIAS VOLTAGE 52 V GRID DC CURRENT AMPL POWER GAIN LAST FREQ USED DC POWER INPUT LOAD ANT VSWR DRIVE RF POWER Fig 5 3 RCU display MEASURE With the up and down buttons you can select the item to be measured listed in an alphabetic order During measuring the amplifier can be used and controlled in OPR or STB modes to transmit and change the frequency segment and antenna if a new frequency is applied to it Return to the MAIN menu is done by the SET EXIT button The following is a list of parameters that can be measured AMPLIFIER POWER GAIN DC POWER
31. ead of using separate cables for those functions from the transceiver to the sockets of the same names See Figure 7 1 below Pin 1 RX RS232 Pin2 RXTTL Pin3 TXTTL RX RS232 Pin4 TXRS232 Pin5 GROUND Pin 10 KEY OUT TX RS232 RX TTL KEY OUT Fig 7 1 CAT Connector pin out front view Many transceivers have different connectors and different signal levels To be sure that your radio will interface properly with the 2000A the connection cable should be prepared according to Fig 7 1 and the corresponding information from your transceiver s user manual Here are some examples Please note that the front view of the cable connectors is shown in these pictures Y serial cable When the CAT port of the transceiver is used for another device such as a computer or an antenna controller a Y cable should be used An example is shown on Fig 7 2 Use only shielded cables for all connections Note that the amplifier will receive correct data only when the CAT connection between the transceiver and the other device for example a computer with running logging software is active TO COMPUTER SERIAL TO ACOM 2000A TO TRANSCEIVER RS 232 PORT OR USB TO CAT CONNECTOR CAT CONNECTOR OR TTL TO RS 232 CONVERTER RS 232 LEVEL CONVERTER Fig 7 2 CAT Connection by RS 232 Y cable ICOM CI V Interface A 3 5mm audio stereo plug a two conductor shielded cable and two 510 Ohm resistors are required The wiring is shown on Fig 7 3
32. fier to rain snow or any liquids AVOID placing the amplifier in excessively dusty environments or in direct sunlight DO NOT OBSTRUCT AIR INTAKE rear panel and EXHAUST top cover areas of the amplifier Keep a minimum distance of 10cm 4 inches to the intake and 50cm 20 inches to the exhaust WARNING Do not undertake on your own repairs or changes in hardware or software of the amplifier in order not to endanger your or other s health and life and not to damage the amplifier and the equipment connected with it not covered by warranty The manufacturer is not liable for another s actions and responsibility shall be assumed by the doer CAUTION To avoid damage not covered under warranty read the Installation Section 2 of this operating manual carefully If you have any doubts about the installation operation or safety of the amplifier please consult your dealer 2 INSTALLATION 2 1 Unpacking and Initial Inspection NOTE Before you start any action on installing the amplifier throroughly read through this manual First carefully inspect both cardboard cartons and their contents for physical damage If damage is apparent notify your dealer immediately Delay may infringe carrier s warranty conditions Keep all packing for possible future transportation In order to take the RCU out of the amplifier remove the cover by removing all screws except the eight located in the tube exhaust areas Remove the plastic tubes holder
33. give a name to each antenna which will be displayed next to its number on the screen First select the antenna number with up and down buttons Use the left and right arrow buttons to choose the character position Then select the character with up and down keys The name can consist of up to 8 characters When finished return to the antenna number with the left arrow button You can return to the first page of MORE SETTINGS menu with the up key or you can exit to MANUAL MODE by pressing the SET EXIT button 5 6 HELP When HELP is selected you can choose one of the help topics by means of the up down and select keys The help topics have the same titles as the sections in this manual Under the title AMPLIFIER INFO you may see the Revision Code of the firmware the Running Time of tubes the Serial Numbers of Amplifier and Tubes front and rear During normal operation of the amplifier information is stored in the nonvolatile memory about the 12 most recent protection trips or irregularities and the time when they have occurred indicated as tube working hours This information can be read if you select LAST 12 PROTECTION TRIPS 6 OFF MENU When the main power switch on the front panel is turned ON but the amplifier is still in OFF state a number of settings can be changed by means of the OFF MENU Fig 3 3 You can enter it by pushing the SET EXIT button Use the up and down buttons to select an item then push left or right arrow b
34. ground path The grounding leads should be at least 8mm AWG 8 or SWG 10 Optional Fan Primary Fuses f fi f j k a c b Fig 2 2 Amplifier Main Unit Connections Fig 2 3 Amplifier Remote Control Unit Connections TRANSCEIVER ACOM 2000A RCU TO ACOM 2000S ANTENNA SELECTOR IF INSTALLED ACOM 2000A MAIN UNIT TO ACOM 2000SW ANTENNA SWITCH IF INSTALLED f k a c OR THE ANTENNA Fig 2 4 Main Unit RCU Antenna Selector and Transceiver connections a Connect the ground stud of the amplifier Main Unit on the rear panel marked GND to the station s grounding system Fig 2 2 Fig 2 3 8 Fig 2 4 b Connect a coaxial cable with a PL 259 plug from the transceiver output to the amplifier rear panel RF INPUT socket CAUTION If this is the first time you will use a high power amplifier in your station pay attention to the coaxial cable type from the amplifier s output It must handle the increased power safely particularly on the higher frequency bands We recommend you use RG213 or better coaxial cable Similar good quality coaxial cable should be used throughout your antenna system Check the power capability of the antenna selector the tuner and the antenna itself especially multiband trap antennas CAUTION Do not use your transceiver s internal tuner with the 2000A this can damage the input of the 2000A c Connect a coaxial cable from the amplifier output on the rear panel marked RF OUTPUT
35. ial port local network functions for more than one up to 15 sets of amplifier antenna units working in a system j Measurement and or constantly monitoring of 20 most important parameters of the amplifier via RCU and or computer k RCU Beep 9 3 Storage and Shipment CAUTION Should you need to transport the amplifier use the original packing as described below First pull the mains plug out of the mains outlet afterwards disconnect all cables from the rear panel of the amplifier and RCU remove the ground connection last and wait 30 minutes Then remove the mains power transformer observing the requirements of S 2 3 but in reverse order Pack the RCU in the box provided for it and put it in the amplifier in the place of the mains transformer Screw in the transport board to the transformer using the four shipping screws pack the four shorter mounting bolts in the polyethylene envelope Finally mount the cover and pack the amplifier and transformer in their original cartons NOTE If transporting for repair you may not need to ship your transformer check with your dealer first 41 a Storage environments the amplifier can be kept packed in dry and ventilated unheated premises without chemically active substances acids alkalies etc in the following climatic environment temperature range 40 to 70 degs Celsius humidity up to 75 35 degs Celsius b Shipping Size and Weight W390mm x D340mm x
36. n order to turn on the amplifier while the Main Power Switch is on press the red button on the RCU and hold it on for about one second and you will hear TEST being sent in CW After successfully passing the INITIAL SELFTEST the following display appears 15 AUTOMATIC HF LINEAR AMPLIFIER PLEASE WAIT i WARM UP IN PROGRESS PNTE EL YAG 150s ANTENNA Eat s Fig 4 1 RCU display during warmup A 2 5 minutes tube warm up period follows during which heater and bias voltages are applied During warm up the amplifier remains in STB so you can operate with the transceiver only You can also change the antennas manually or read the HELP texts during the warm up period NOTE When you intend to have a brief pause in operating e g less than 30 minutes itis better to leave the amplifier in STB mode instead of turning it off Tube life may be shortened by repeatedly turning on and off the tube heater supply If you are concerned about this discuss it with your dealer NOTE However if you unintentionally power off the amplifier it is best to switch it on again immediately When the pause is short up to one minute and the cathodes are still warm the warm up period is shortened significantly which reduces the waiting time and prolongs the tube s expected life b MAIN MENU After the indicated warming up period expires all voltages are automatically applied to the tubes in the correct sequence At the same time the stepper mot
37. ng the amplifier to your mains supply be sure that the supply is correctly wired and is adequate for the current drawn by the amplifier Make certain that the grounding lead is connected properly in the wall outlet for the amplifier It is preferable that you use the wall outlet closest to the source The installation leads should be at least 2 5mm AWG 12 or SWG 15 Check if the respective fuses can handle current up to 20A as well as if the voltage corresponds to the voltage for which the amplifier is set S 2 2 If you connect the amplifier to a different mains outlet be sure that you check it too Make sure the main Power Switch on the front panel is in OFF position so that the red strip on the switch is hidden and insert amplifier s mains plug into the wall outlet prepared for it The amplifier remains switched off 2 5 Installation of Optional Fan This fan is not necessary in SSB and CW modes nor in continuous carrier modes RTTY SSTV etc with carrier down times of maximum 15 minutes and a subsequent pause of 3 minutes For higher duties the fan is recommended The auxiliary fan 119x119mm is supplied as an option with a set of 8 screws nuts and washers It may be mounted by the manufacturer or dealer on request Fig 2 2 Contact your dealer or see the TECHNICAL SUPPLEMENT for details 3 POWER ON RCU CONTROLS INDICATORS AND MENUS CAUTION Before you turn the amplifier on at least 2 hours should have expired since i
38. o directions a you can enter the OFF menu see below or b you can turn on the amplifier and begin the warm up sequence After 2 5 minutes you will enter the MAIN menu see S 4 1 and may start operating the amplifier The OFF menu see also section 6 can be reached by pressing the SET EXIT button 14 CALL SIGN LZ1KCW AUTO ANTENNA CHANGE ON OFF AUTO OPERATE ON OFF SELF ADDRESS 16 CLEAR THE USER TUNINGS YES NO CLEAR THE MEMORY YES NO Fig 3 3 RCU display OFF MENU By means of the UP and DOWN keys you can select one of the listed items Then with the left and right arrow buttons you choose the desired value or move the colored frame on it The call sign character positions are selected by left and right arrow buttons The character in a selected position is changed by means of the UP and DOWN keys Push the left button repeatedly to return to the items list To exit the OFF menu press the SET EXIT button again The purpose and use of the OFF menu settings are described in detail in Section 6 after the description of the basic functions and use of the amplifier 4 AUTO MODE Operation of the 2000A amplifier is simplified a great deal due to the high degree of automation You can start operation immediately after it is installed However to make full use of its possibilities and to fully configure the amplifier we recommend that you thoroughly read the following information 4 1 MAIN MENU a TURNING ON I
39. onal auxiliary fan must be mounted c Intermodulation Distortion Better than 35dB below rated PEP output d Hum and noise Better than 35dB below rated output e Harmonics Output Suppression Better than 50dB below rated output f Input and Output Impedances nominal value 50 Ohm unbalanced UHF SO239 type connectors input circuit broadband VSWR less than 1 3 1 1 8 30MHz continuously no tunings no switching bypass path VSWR less than 1 1 1 1 8 30MHz continuously 39 output circuit matching capability better than VSWR 3 1 2 1 for 160m or greater at reduced output levels automated g Automatic Tuning Load Impedance Matching less than 3 seconds Band Change less than one second Segment Change less than 0 2 seconds h RF Gain 14 5dB frequency response less than 0 5dB 50 to 60W drive power for rated output i ALC grid current derived 11V max rear panel adjustable j Primary Power 90 132V 100 amp 120V nominal taps 1096 tol and 180 264V 200 220 amp 240V nominal taps 10 tol 50 60Hz single phase 3500VA consumption at rated output In USA 240v is strongly recommended k Complies CE safety and electromagnetic compatibility requirements as well as FCC regulations 1 Size amp Weight operating W440mm x D500mm x H180mm 36kg m Operating environments temperature range 0 50 degs Celsius humidity up to 95 35 degs Celsius altitude up to 30
40. ors conduct a self test and finally tune the plate circuit to the frequency segment on which the amplifier was last used You hear R being sent in CW and the MAIN MENU appears on the TFT display see figure 4 2 below 16 FORWARD POWER kW 0 03 0 1 0 2 03 0 4 28 300 28 600 m ANT2 AUTO 4EL YAGI HEATER PLATE DRIVE DEFAULT BAND SEGMENT ANTENNA m Latins gi ne Fig 4 2 RCU display MAIN MENU The RCU display provides information about the current operational condition of the amplifier You can see three bar graphs Forward Power Reflected Power RFL and Exhaust Air Temperature Unless transmitting only the last one is active indicating the Exhaust Air temperature in degrees C The whole HF spectrum is divided into 250 segments Segment width increases with frequency from 25kHz on 160m to 300kHz on 10m You can use up to ten different antennas and tunings per segment This may be useful with narrow bandwidth antennas The frequency segment on which the amplifier is tuned in MHz is indicated on the left hand side on the display 28 300 to 28 600 in Figure 4 2 above Below the frequency segment the number of the antenna in use is displayed along with its name and how the antenna was selected manual or auto If the CAT connection to the transceiver is turned on the transceiver type is shown at the left side under the antenna field At the bottom left it is shown the tune type for the current frequency segment
41. r so that the captive nuts are aligned with the corresponding chassis holes Make sure that the transformer is centered The transformer bolts must be installed NOW for safe operation Holding its two sides front and back simultaneously pull the amplifier towards you just far enough that the two outside transformer captive nuts appear off the table edge Support the amplifier until your assistant loosely screws in the two outside transformer mounting bolts Pull the amplifier a further 12 13cm about 5 inches until the other two captive nuts appear off the table edge Keep supporting the amplifier until your assistant loosely screws them in After checking that the transformer is centered tighten all 4 bolts Now move the amplifier back over the table The transformer s Mains Connector plugs into the AC power console Fig 2 1 The other three connectors HV Motors Voltage 8 Screen Grid Voltage plug into the HIGH VOLTAGE PCB clearly seen on top Replace the cover and carefully reinstall all screws 2 4 Connections The amplifier is now ready to be connected to your station Connection must be accomplished in the order described below before you apply mains voltage to the amplifier WARNING Have in mind that the grounding system may have to withstand currents over 20A with insignificant voltage drop on it Therefore it may be necessary to improve it considerably to become lower resistive i e with heavier leads and lower resistive
42. rocedure ato te da ds LEE ata LL el dei dem pA 26 5A CCAT SETTINGS x50 E ng nU UU QUA O 26 5 5 MORE SETTINGS 03 odas 27 5D BA e a dl ai alee ott 29 6 OFF MENU aan RS ERST Gee CUI a eR ee 29 Bl CALLSIGN tr ant Seed crete eel Ligh leat ep ees 29 6 2 AUTO ANTENNA CHANGE 43x RR dan 30 BO AUTQUOBERATE o cem oem OD SURG a en NR 30 6 4 SELF ADDRESS at os ex E CE EAD LENT EM 30 6 5 CLEAR THE USER TUNINGS o occcccccc 30 6 6 CLEAR THE MEMORY 1224 ais sl dd 31 7 CAT OPERATION AND CONNECTIONS ss 31 8 MAINTENANCE 23 20 cant ERA DEFECT each Clee eee REED 35 o A t bee oe dote sar We hito on dede hed 35 8 2 Backup Battery Replacement 000 eee eee 35 8 3 Fuse Replacement sse sne semanu ipii eee 35 8 4 Tube Replacement o o oooococoooo ee 36 8 5 The ACOM2000A Simplified Schematic Diagram 36 9 6 Troublesnoolrng xxt m tete AA ee a Ee ms 37 9 SPECIFICATIONS sore ces a A a E OR 39 9 1 Parametros tral dear Loca 39 9 2 FUNCIONS 2 2 exe mais uan iui edo y ES alada e lee s 40 9 3 Storage and Shipment cauce ras pad a dale dos 41 10 BRIEF MENU GUIDE 5 423 2o x pr rias a ER 42 1 GENERAL INFORMATION 1 1 Introduction and Description This manual explains the installation operation and maintenance of the ACOM2000A automatic HF linear amplifier The ACOM2000A is a complete and self contained linear amplifier that covers all amateur bands from 1 8 through 30M
43. s but keep them for possible future transportation Do not remove the silicone rubber chimneys WARNING HIGH VOLTAGE Check the HV Crowbar Fig 2 1 it must reliably short the HV lead to the chassis when the cover is removed Take the RCU out and free the compartment for installing the transformer Carefully inspect the RCU and the amplifier main components for any possible shipping damage NOTE Check carefully the serial numbers of amplifier and tubes with the Table of Individual Data Table 2 1 If you find any discrepancies notify your dealer immediately to have your warranty information corrected AMP s n Front tube s n Rear tube s n Voltage Selector Position VAC Optional Fan Output Voltage VDC Table 2 1 ACOM2000A Individual Data 2 2 Line Voltage Selection CAUTION To avoid damage not covered under warranty verify that the voltage for which the amplifier is set corresponds to your mains nominal voltage Most 120V and especially 100V domestic mains installations may not withstand the current consumption and you will have to reduce the output power to about 1000W PEP In USA 240V is strongly recommended Normally the amplifier is supplied with Voltage Selector set for a nominal mains voltage of 240V There might be exceptions in cases of special delivery and then the voltage set is noted in the Table of Individual Data Table 2 1 If your mains has a different nominal voltage it will be necessary for you to contac
44. scribed in the TECHNICAL SUPPLEMENT CAUTION Do not connect to the connector marked RS 232 a standard cable because this may result in damage in both amplifier or connected equipment In order to use the RS 232 interface a special cable must be prepared Contact your dealer or see TECHNICAL SUPPLEMENT for details k Mains plug and fuses WARNING If your amplifier is only fitted with one mains fuse it is suitable for 0 220 240 VAC electricity supplies ONLY these supplies are standard in the European Community Your dealer will check that your amplifier is correctly fused before it is shipped to you Customers should check with a qualified electrician if the amplifier is to be used outside the country in which it was purchased Due to the different standards in different countries the mains plug is supplied and mounted by the dealer He connects to the mains cord end a standard mains plug which meets the Safety Class units standard in your country The ground lead of the amplifier s mains cord is colored yellow with two green stripes and the blue and brown leads are active When the amplifier is to be used with only one mains fuse it is connected in series with the brown lead which must be the active If you have any doubts about the correct way of connecting the wires consult your dealer All amplifiers sold in the USA will have two fused leads Preparation of wall outlet for the amplifier 11 WARNING Before connecti
45. settings in the nonvolatile memory 6 3 AUTO OPERATE Set to OFF by default When ON is selected the amplifier will remain ready to operate even automatically returning from standby after a soft fault protection trip That is after a protection trip e g from an overdrive event the amplifier will normally shift to the STB mode for about four seconds but it will automatically return to the OPR mode after that Even with ON selected however you still may depress the OPR hardware button manually to go to and remain in the STB Stand By mode at any time such as when you leave the station for a while If OFF is selected for AUTO OPERATE the amplifier will go and remain in the STB mode after a soft fault until switched over to the OPR mode manually by the operator or an intended command is received via the local network 6 4 SELF ADDRESS Here you can set the amplifier self address for operation in a network with other systems When the amplifier is not used in a network this address is meaningless 6 5 CLEAR THE USER TUNINGS NOTE If you use this function it is advisable that you update the USR tunings see S 4 1 When selected YES this function clears all USR tunings from the nonvolatile memory but does not change anything else in the INFO BOX The use of CLEAR THE USER TUNINGS is convenient when the amplifier is moved to another operating place to prevent from mixing with the remaining USR tunings which are
46. signed to meet international safety standards and complies with CE safety and electromagnetic compatibility requirements as well as FCC regulations This operating manual contains information precautions indications for cautions and warnings which must be followed by the user to ensure safe operation and to keep the ACOM2000A in safe operating condition PRECAUTIONS The EXPLICIT DEFINITIONS described below apply to this operating manual WARNING notes call attention to a procedure which if not correctly performed could result in personal injury fire hazard or electric shock CAUTION notes call attention to a procedure which if not correctly performed could result in equipment damage not only in the amplifier N O T E notes call attention to a procedure which if not correctly performed could result in inconvenience WARNING HIGH VOLTAGE The amplifier works with high voltages up to 3000V which are LETHAL Also for your safety pull the amplifier power plug out of the mains wall outlet and WAIT AT LEAST 30 minutes EACH TIME BEFORE you remove the cover of the amplifier Do not touch any part inside while the amplifier is open because some residual voltages may still be present WARNING HIGH VOLTAGE Never allow anyone ESPECIALLY CHILDREN to push anything into holes in the case this will cause electric shock NEVER TOUCH AN ANTENNA during transmission this may result in an electric shock or burn NEVER EXPOSE the ampli
47. t increased mains voltage You may use it in conditions with lower than nominal mains voltage Departure from NORMAL selection should be mainly used to compensate for small line mains voltage variations in order to maintain tubes efficiency and linearity at deviated mains voltage However when there is more than plus or minus 5 deviation from the nominal line mains voltage the voltage selector inside the amplifier should be changed see S2 2 A LOW NORMAL HIGH change requires refreshing the USER tunings in order to take place c CLEAR THE SEGMENT TUNING Use this entry if you want to erase a single USER tuning Choosing YES will restore the DEFAULT tuning for the current segment and antenna at leaving the menu d DISPLAY BRIGHTNESS The display brightness can be adjusted through the left and right arrow buttons e SOUND You can turn ON and OFF the RCU internal beeper When turned ON the amplifier will alert you with a beep or CW characters at the start and at end of some procedures as warmup and autotune Every fault that would trip the protection also will be indicated by letter F in CW f ANTENNAS To enter the antenna list press the down button one more time when the marker is on the last line 28 ANTENNA 1 20M AG ANTENNA 6 160 VERT ANTENNA 2 C ANTENNA 7 WET NOOD ANTENNA 3 ae DIPO ANTENNA 8 ANTENNA 4 5E ANTENNA 9 ANTENNA 5 RIBAND ANTENNA 10 Fig 5 7 RCU display MORE SETTINGS ANTENNAS Here you can
48. t was brought in and unpacked in the room where it will be used Pay particular attention when you move it from a very cold into a very warm place condensation is likely and this could result in damage to the high voltage circuits In such a case wait at least 4 hours A similar effect can occur after a rapid warming of the operating room for instance after switching on a powerful heater CAUTION To avoid damage not covered under warranty carefully check that the voltage for which the amplifier is set corresponds to your mains nominal voltage see S 2 2 and table 2 1 After following all instructions in S 2 you can turn ON the Main power switch on the front panel The red LED indicator above it must light and a picture will appear on the RCU Fig 3 1 12 AUTOMATIC HF LINEAR AMPLIFIER LZ1KCW 4E YAGI HELP SET EXIT HF LINERR AMPLIFIER Fig 3 1 Remote Control Unit RCU NOTE The owner s call sign will be only displayed after it has been programmed into the RCU See Section 6 1 for details on programming your callsign In this condition only the RCU is operational while the amplifier itself is still fully off Nevertheless you have access to the HELP feature at the left bottom corner see S5 6 and you can switch antennas if the ACOM2000S automatic antenna selector and the ACOM2000SW remote antenna switch are installed The assigned number and name of the currently used antenna is shown at the right bot
49. t your dealer or see the TECHNICAL SUPPLEMENT for details 2 3 Transformer Installation CAUTION After installing the transformer the weight of the unit is about 35kg 78 lbs which should preferably be handled by two persons An assistant may be needed to hold the amplifier steady during transformer installation Position the amplifier with the transformer not yet installed flat on a table near the place where it will be used During the process described below when the amplifier cover is removed take care not to torque or twist the chassis nor let the amplifier stand on edge Do not lift the unit by only one corner Orient the amplifier on the table so that the transformer compartment is in front of you Fig 2 1 HV PCB HV Crowbar AC Power Console Mains Connector HV Connector Motor Voltage Connector SG Voltage Connector Fig 2 1 Transformer Installation Take the transformer out of the carton and remove the shipping board but do not discard the shipping board or the bolts For transformer mounting four shorter bolts M8x16mm are provided in a polyethylene envelope inside the same carton Use the polyethylene envelope to store the longer shipping bolts Keep the board together with the four long bolts and all packing for possible future transportation of the transformer Move the transformer using its rope sling handle into the compartment Take care not to damage the wiring or components and position the transforme
50. ted and there is constant monitoring and protection of all supply voltages and currents The Bias Optimizer decreases the heat dissipated from the tubes and there is automatic protection against overheating or insufficient air flow A novel and innovative output RF Arc protection is employed It safeguards the amplifier antenna antenna selector and tuner against severe damage in case of possible break down High voltage power supply inrush current protection which eliminates the danger of affecting sensitive devices connected to the same mains circuit The amplifier can be configured for 5 nominal line voltages 100 120 200 220 and 240VAC 50 or 60Hz Other nominal values possible on request Continuous measuring and or monitoring of 20 most important parameters of the amplifier exciter and antennas via RCU and computer as described in the TECHNICAL SUPPLEMENT All functions are accessible from a computer via RS232 serial port connection Also local networking capability exists for more than one set of amplifier antenna units working in a system 1 5 Safety Considerations Explicit Definitions The ACOM2000A Automatic HF Linear Amplifier is a Safety Class unit i e the third grounding lead of its mains cord which is colored yellow with two green stripes and the ground stud on the rear panel of the amplifier marked GND both must be connected to the station s grounding 4 system for safe operation The amplifier is de
51. tom corner of the display just above the antenna change key Except for the main power switch on the front panel the amplifier is controlled via the RCU see Fig 3 1 The amplifier is toggled ON or OFF by pressing the red ON OFF button There are two more fixed function buttons located at the left bottom the OPR button which is used to toggle between OPERATE and STANDBY STB modes and the SET EXIT button to enter and exit the menus The six buttons immediately below the bottom of the display are soft keys and their function can vary depending on what the context is at the time As you explore the various functions of the amplifier the functions of these buttons are explained in detail The control of the amplifier is structured in two menus OFF and MAIN each having several sub menus fig 3 2 13 POWER ON S 3 SET EXIT HELP SET EXIT HELP S 5 6 MANUAL MODES S 5 AUTO TUNE S 4 2 TUNE CALL SIGN S 6 1 MANUAL TUNE S 5 1 AUTO ANT CHANGE S 6 2 AUTO OPERATE S 6 3 SELF ADDRESS S 6 4 CAT SETTINGS S 5 4 CLEAR USER TUNINGS S 6 5 MORE SETTINGS S 5 5 CLEAR THE MEMORY S 6 6 HELP S 5 6 Fig 3 2 Menu Structure see also S 10 NOTE We recommend that before powering up the amplifier for the first time you familiarize yourself with the functions of the RCU in the OFF menu The available controls and indications seen on the RCU are similar in both the OFF and MAIN menus You can proceed in one of tw
52. uttons to choose the value 6 1 CALL SIGN You can select any 9 character text to appear in the OFF MENU for example your own CALL SIGN The up and down buttons select the character in the position indicated by the cursor the characters are in an alphabetic order by the ASCII code The left and right arrow buttons move the cursor left or right to select different character positions When finished return to the CALL SIGN label with the left arrow button 29 Erasing the nonvolatile memory see S 6 6 will blank the CALL sign message until the text is reprogrammed following the procedure described above 6 2 AUTO ANTENNA CHANGE When YES is selected changing frequency segments manually or following the transceiver frequency or by CAT S 4 1c will cause the antenna last used in the respective segment and the tuning settings for it to be selected This is convenient when you have 1 or 2 antennas for each band With more antennas you would have to keep track of which antenna you used last If NO is selected this function is disabled and the currently used antenna is changed only after an intentional command is given for an antenna change manually or via the local network see S 4 1d When changing frequency segments the tuning settings for the antenna currently used will be selected in the new segment This mode is preferred when you have multiple antennas per band Selection of YES or NO does not change any contents for tuning
53. ving drive power the RCU returns automatically to the MAIN menu with USER or DEFAULT indicated C If you are using your ACOM2000A connected by CAT to a transceiver the USER tuning preparation procedure is extremely simple If the transceiver is FT 450 FT 950 FT 2000 FT 3000 FT 5000 FT 9000 IC 756PROIII IC 7410 IC 7600 IC 7700 IC 7800 K3 TS 480 TS 590 TS 990 TS 2000 or another modern CAT protocol enabled radio you need only to push the RCU TUNE button ACOM 2000A will do the rest by itself f your transceiver is not one of those listed above and its output power can t be controlled by CAT you must set the output power to between 10 and 20W and push the TUNE button or reduce the power and adjust it as explained above in para 4 2b after pushing the TUNE button 4 3 Erasing USER segments return to DEFAULT tunings If you wish to clear a USR setting for a frequency segment and or antenna there are two ways this can be accomplished a to clear all memorized USR tuning settings while in OFF MENU select CLEAR the USER TUNINGS see S 6 5 b for separate segments and or antennas select the segment and antenna for which you want to erase the USR tuning see S 4 1c d e enter MANUAL MODE select SETTINGS and choose CLEAR THE SEGMENT TUNING see S 5 5c 22 5 MANUAL MODES Pushing the SET EXIT key while in main menu will get you to the MANUAL MODE FORWARD POWER kW 0 03 01 02 03 04 05 06
54. with a PL 259 plug to the antenna selector or tuner or to the antenna for the respective band NOTE Your amplifier will not work if KEY IN is not connected properly Transceiver producers give different names to this output and they are for instance TX GND SEND T R LINE etc Some transceivers require that ground on transmit is implemented via a software command or by changing the setting of a switch on the rear panel or interior of the transceiver Check your transceiver s manual d Run a cable terminated in a RCA phono plug from the transceiver socket providing ground on transmit to the RCU rear panel KEY IN socket NOTE If there is a CAT connection between your amplifier and your transceiver which carries also the KEY IN signal you don t need a separate KEY IN cable Not all transceivers however have this capability Please see section 7 for more details e The KEY OUT socket on the RCU rear panel provides an extra control signal from the amplifier to the transceiver It could be used to improve the transmit receive switching If your transceiver has a suitable input that disables transmission we recommend that you connect it with a cable terminated in a Phono connector to the KEY OUT socket of the RCU Transceiver producers give different names to this input and they are for instance TX INHIBIT MUTE LINEAR etc Check your transceiver s manual Consult your dealer or see the TECHNICAL SUPPLEMENT for details If your
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