User Manual External Radio Frequency Power Amplifier
Contents
1. MAINTENANCE 6 1 Indication of Fault Conditions If a fault condition appears during the operation of the amplifier the safety circuits of OM2000 will react There are several warning or fault messages possible to appear on the display when some of the protection will be activated The OM2000 power amplifier can report one of the following messages Page 28 from 35 Power Out is too high Refl power too high Power In is too high Low output power tune Plate current too high Grid current is high Screen current error N A Heating voltage error HARD FAULT Plate voltage error Grid voltage is low Screen voltage error SWR is too high Amplifier is too hot TM M OO PLOOSN OU BU N FE l NOTE Most of safety circuits are preset for two levels of exceedances First level is a warning level In such a case a warning message appears on the display fault LED will flash but power amplifier will stay in normal operation See the table below for warning and fault conditions NOTE When a fault condition appears during the tuning or operation of the amplifier the safety circuits will block transmitting and FAULT LED starts blinking The amplifier stays in OPER mode After approx 1 sec the control circuits will automatically switch the amplifier back to the transmitting mode If problem persists safety circuit will react again CAUTION If the fault will repeat 3 times during 10 seconds the safety circuit2. is too SWRistoohiph ma Amplifier is too hot 80 deg mo 90 Ha 1 This fault indicates mistuning of the PA It works for Input power higher than 10W If output power decreases more than 3dB below value corresponding with the applied Input power fault message Low output power appears You have to tune the PA correctly 2 When the heating voltage exceeds boundaries 9V 2V warning message Heating voltage error appears Check proper position of AC selector page 25 Heating voltage without RF signal should be between 8 5 and 9V 3 HARD FAULT appears if the plate current exceeds 2 5 A In such a situation hardware will immediately disconnect high voltage from the plate Fault is signed with the letter A in the memory If error occurs frequently consult this situation with the manufacturer please 4 If temperature sensor inside the PA detects of 80 deg Celsius warning message Amplifier is too hot appears on the display At 90 degrees protection circuit will automatically block transmitting fault condition You have to decrease the power or wait couple of minutes to be ready transmitting again Fault is signed with the letter F in the memory An example shows situation when Input ON AIR STBY FAULT ON power is too high By pressing PTT safety circuit will react quickly error message appears and FAULT LED starts blinking In this case screen current exceeds limited value 60mA
3. to switch PA ON OFF RESET Short press to reset faults or warnings 0 Power ON small 12V APU for logic and protection circuits You can switch Antenna ports even if PA is switched OFF ON AIR STBY FAULT ON S1 S2 93 S4 Page 13 from 35 ON AIR STBY FAULT ON S1 S2 S3 S4 Transmitting mode LED Standby mode LED Failure LED PA is ON LED OPER STBY Press to switch between Standby and Operation mode ESC Return to the previous level MENU Enter the Menu DOWN Scroll down DSP Change display DSP1 DSP2 DSP3 UP Scroll up ANT Change Antenna output ANT1 ANT2 ANT3 ENT Confirm the selection More functions of S1 S4 buttons will be described in next parts of this manual 5 2 Preparation for use The first necessary thing after connecting AC to the power amplifier is switching main green switch to 1 Welcome message and then starting information appears on the display After switching main switch ON welcome message appears shortly Starting message shows which antenna is connected To switch PA ON press ON OFF button for abt 1 second Warming time takes abt 210 seconds It is possible to enter MENU during this time but with limited possibilities display settings can be changed for example You can change ANT output if necessary Page 14 from 35 If you change DSP during warming time you lost count down information Press BACK S1 to
4. 6 3 x 32mm accessible from the rear panel only In the case of fuse fuses interruption inside the power amplifier exchange can be carried out only by professionally qualified person Internal fuses are located mainly on the SWITCH on board next to the HV transformer One special fuse is used in the model OM2000 In the case of an accidental discharges in the tube this fuse saves HV supply circuits Fuse 6 3 Tube Replacement In the case of vacuum tube damaging contact the manufacturer or your dealer for ordering new one You will get instructuions how to change it Exchange can be carried out only by professionally qualified person After tube replacing automatic BIAS adjustment must be done Read Service menu 5 2 3 and pictures on page No 20 for more details 6 4 Cleaning To prevent damage to amplifier surface and plastic components do not use aggressive chemicals for cleaning Do not open the amplifier for cleaning Outer surface may be safely accomplished by using piece of soft cotton cloth moistured with clean water or window cleaner Page 32 from 35 TUNE es Km MA LAN 77 Ww MM AUC A A jd T s LOAD NE K TLA Ld i F 2 100 e 7 APPENDIX 7 1 Primary AC voltage selection Primary section of the HV transformer is switchable for three values of AC voltage 220 230 240V Factory settings is 230VAC Before first starting of the PA we recommend to check the correct va
5. AO 20 5 3 Operation mode ebussueiqibitmedabieui ee Oo SE E DER ater roD 23 5 4 Tuning of the Power Amplifier esee 24 6 MAINTENANCE J 242 Lesser enne enhn nnne nnn ed sen Ge ee tanken enne innare n 28 6 1 Indication of Fault Conditions esses eene nennen 28 Page 2 from 35 6 2 Fuse Replaceii nt uu via UM Ee tua ee deut 32 6 3 TubeRheplacement N EE EE Ge star ee 32 6 4 Cleaning os eet O torte aeos 32 7 APPENDIX d esaisitsbitnnsieidvetusdr EP ee ee 33 7 1 Primary AGSselecuOD aunoa E T SEN 33 7 2 Removing the HV Transformer unirea nnns 34 7 3 Block Diagram of the OM2000 Power Amplifier 36 Page 3 from 35 1 GENERAL INFORMATION 1 1 Introduction he OM Power model OM2000 is designed for all short wave amateur bands from 1 8 to 29 7 MHz T including WARC bands plus 50 MHZ and all modes It is equipped with a ceramic tetrode FU 728F 1 2 Specification 1 2 1 Parameters Frequency Coverage Amateur Bands 1 8 29 7 MHz including WARC 50 MHz Power Output 1500 W in SSB CW on HF bands 1500 W in CW SSB on 6m 1500 W in RTTY Input Power Usually 70 W for full Output Power Input Impedance 50 Ohm VSWR lt 1 5 1 Power Gain 15 dB Output Impedance 50 Ohm unbalanced Maximum Output SWR 2 1 SWR protection Automatic switching to STBY when reflected power is 250W or higher Intermodulation distortion 32dB below nominal outpu
6. blower area Antenna switch above is installed inside the metal box Page 11 from 35 5 OPERATION WARNING Before switching PA on make sure that amplifier is grounded antenna or dummy load is connected and line cord is putted to the outlet Be sure you selected AC input by 7 1 CAUTION Before switching PA on check all connections between PA and TCVR CAUTION Do not turn PA on for at least 2 hours after unpacking it and locating in its operating location Especially when amplifier is moved from a cold place to a warm one because not visible condensation may develop and this could result in damage to the high voltage circuits of the PA CAUTION Never try to change antenna output during a transmission to avoid warranty loss NOTE When you decide to have a short operating break place the amplifier to the standby mode rather than switch it off 5 1 Operation elements There is couple of operational elements accessible or visible on the front panel ON AIR STBY FAULT OW N T s c z 0M 2000 1 8 52MHz AMPLIFIER Page 12 from 35 BAND Band selector switch TUNE Anode capacitor for tuning higher frequencies to 0 lower frequencies to 100 LOAD Output capacitor tunes antenna load resistance to the amplifier Capacity is low at 100 and high at 0 on the scale WATMETER Analog double system meter for forward and reflected power measuring ON OFF Long press abt 1 sec
7. carefully Use minimum length cables and make certain that the connections are both physically and electrically sound With poor grounding you may risk damaging your equipment having problems with TVI BCI or your transmitted signal may be distorted 4 2 Coaxial Cable The output of the transceiver is to be connected to the input of the amplifier via RG58 or similar cable For the connection between the power amplifier and the antenna RG213 or similar coaxial cable suited for high power is recommended All the INPUT and three OUTPUT ANT1 ANT2 ANT3 SO 239 sockets with Teflon insulation are used Rear view of the amplifier OM2000 Fuses Mains Plug HF Outputs Auxiliary fan Grounding point Control HF Input 4 3 Control Cable Control cable maintains TX RX switching of the PA TX GND The cable is shielded On the side of the power amplifier a CINCH socket is used On the side of your transceiver you have to use a socket suitable for this transceiver During transmitting the middle pin is connected to the ground The relays of the OM2000 have to be switched earlier than HF is applied cold switching Modern transceivers they have a time delay between PTT switching and power output Page 10 from 35 CAUTION If you are using an older transceiver or transmitters without time delay we recommend to connect the PA in such a way that the transmit receive switch foot switch for example is connected with the KEY IN socket of the amp
8. input At the moment when RF signal comes to the input of PA bias will automatically change to its working value EBS level means level of the Input power where EBS starts working Default EBS value is 0 2 W We recommend using EBS ON Significant accompaniment of used EBS is temperature reducing To enter Settings menu go to MENU first then press SET button Use UP or DOWN button to select EBS ON OFF Press ENT to enter EBS status settings Press ON or OFF to set status of EBS Press ENT to confirm selection Press ESC to go one level back Use UP or DOWN button to select EBS level parameter Press ENT to enter EBS level settings Use UP or DOWN button to set EBS level value Press ENT to confirm EBS level value Press ESC to go one level back Page 18 from 35 SETTINGS Restore default rar ESC DOWN UP EHT Change Farametres Lo default values Press YES for 1 sec ESC VES HO ENT SETTIHGS Set LCD contrast ESC DOWN UP EHT Set contrast for disrlay Contrast 88 ESC EE N UP EHT SETTINGS Set blower ESC DOWN UF ENT SETTINGS Blower with temrera ESC NORM PTT Wn If you wish to restore factory default parameters use UP or DOWN button to select Restore default parameters Then press ENT Press YES for 1 second to confirm restoring Use UP or DOWN button to select LCD contrast Press ENT Use UP or DOWN button to set contrast value Press ENT to confirm settings Use UP or DOWN butt
9. the PA as most operators accustomed In every case we recommend adjust the display for both of methods so it shows two parameters important for fine tuning TUNE and Is graph gt 72 1500 Press OPER to enter operation mode Apply low input power and press PTT Be sure you selected right BAND TUNE and LOAD knob positions If you made some mistake fault message appears ON AIR STBY FAULT ON zd B 1 5 safety circuit stopped transmitting fault LED is ON Fault code 4 is saving to the memory Release PTT set proper positions of BAND TUNE and LOAD according to the table and press PTT again Page 25 from 35 Another mistake can occur if you have antenna connected to the wrong output In such a case SWR is too high error message appears Change antenna output using S4 button This is not an optimal result TUNE indicator must go between both arrows Use TUNE knob to get maximum output power and LOAD knob to get indicator between arrows Another example of not optimal result TUNE indicator must go between both arrows Use TUNE knob to get maximum output power and LOAD knob to get indicator between arrows in arrows direction This is a good result of tuning w tamem m Cp nm umor App L xa il TY T ASAF i ae Sees EE PR Erxl Now increase the input power slowly and watch the display Two of important information is visible screen current increased but still is within the allow
10. AIR STBY FAULT ON Using foot switch in KEY IN we activated transmitting mode of the PA first ON AIR LED is ON EBS is active Ip 20mA In the transmitting mode all 4 buttons S1 S2 S3 and S4 are blocked An example of standard tuning procedure using Analog wattmeter 5 4 Tuning of the Power Amplifier The OM2000 power amplifier is operated in class AB Thus it s possible to obtain a maximum output power at excellent linearity For this purpose the amplifier has to be tuned carefully CAUTION The operation of a mistuned PA will cause malfunctions the increase of grid current and problems with TVI BCI CAUTION If the input power is higher than 10W and the power amplifier is NOT correctly tuned the safety devices will switch it to STBY After switching the amplifier to STBY you need to switch it back to the OPER mode by pressing RESET button shortly Page 24 from 35 A tuning table is delivered with the power amplifier For coarse tuning select a band with BAND switch and choose the setting of TUNE and LOAD capacitors according to the table WEN WEN NN WE MEN NOTE Delivered tuning table was made for 50 Ohm loading of PA dummy load Each amplifier should have different values depending on used frequency and used type of antenna Make your own table valid for your real conditions There are two ways how to do fine tuning The first method uses a gradual increase in the input power when tuning
11. After abt 1 sec PA returns to TX mode Reduce Input power to avoid fault repeating Page 30 from 35 ON AIR STBY FAULT ON This is the situation when problem with high Input power persists Safety circuits reacted 3 times and then switched PA to STBY mode Permanent fault appears To return PA to the normal operation decrease Input power first then reset fault status and go back to the OPER mode If resistor R1 or fuse F3 is damaged safety circuit stops starting of the PA and fault message appears on the display It is necessary to replace the damaged component T 9 TRAFO Fuse F3 Resistor R1 If there is a fault condition always try to remove the cause first If it is not a hardware failure it usually succeeds For example high VSWR high Input power mistune of PA high temperature etc In the case of some hardware failure or if your power amplifier is not working properly please contact the manufacturer or your dealer WARNING Never try to change or move any part inside the amplifier except of tube or fuses Substitution of parts may void intrinsic safety Manufacturer s contacts OM POWER s r o 930 30 Bac 126 SLOVAKIA Email om power om power com Page 31 from 35 Dealer in USA Array Solutions 2611 North Belt Line Road Suite 109 Sunnyvale TX 75182 Tel 214 954 7140 Email sales arraysolutions com 6 2 Fuse Replacement The user is allowed to change mains fuses
12. Automatic set up anode current BIAS no need to adjust manually after changing the tube Temperature controlled 2 speed centrifugal blower turbine axial blower Full QSK with silent relay Many operational parameters to display Easy transport due to detachable HV transformer The smallest and lightest 1500 W PA on the market Page 5 from 35 2 SAFETY INSTRUCTIONS WARNING DANGEROUS HIGH VOLTAGE INSIDE The power amplifier is using high voltage up to 3000V DC which is very dangerous for human life Read next safety instructions carefully first before you will start to install and operate power amplifier NEVER VIOLATE NEXT RULES WARNING NEVER ALLOW CHILDREN to play around PA or to touch power amplifier or connected cables in working condition or to push anything into the case holes WARNING Never turn the amplifier on without the upper lid in place DO NOT ATTEMPT TO SHORT OR BYPASS safety switch under upper lid WARNING The OM2000 amplifier is neither to be used in a WET or HUMID environment nor to be exposed to RAINFALL WARNING Do not turn the amplifier ON without having connected the ANTENNA or properly rated DUMMY LOAD A hazardous HF voltage may build up on the antenna connector after turning the amplifier on with no antenna or dummy load connected WARNING Before opening the upper lid of the amplifier make sure that power supply has been disconnected AT LEAST 10 minutes allowing the electrol
13. User Manual External Radio Frequency Power Amplifier Model OM2000 FCC IDENTIFIER X8NX8NOM2000 Array Solutions 2611 North Beltline Rd Suite 109 Sunnyvale Texas 75182 USA Tel 214 954 7140 fax 214 954 7142 E mail info arraysolutions com Page 1 from 35 TABLE OF CONTENTS 1 GENERALINFORMATION esse ee esse sedes see see ee ee ee ee Ee ee ee ee Ee ee ee ee Ee ee 4 2 1 Hodud o NE 4 2 2 SDECHICAUOM M N N 4 2 21 Parameters EER EER OE EEDEN EDOM Ee tas IND SRM UE 4 22 2 SPROUGCHOD CIPCUIES suspected EE REDE DES dM CRI RUD MOI 4 223 Iacat EE tuit bd bM URN 5 2 2144 Features euetesstuneHisissiesssU Musis EE ONE Ut In ag EP 5 2 SAFETY INSTRUGCTIONS usspxastxxisquisivi Vp Ris Geek inin aa TEN HER UU IRE RAE DONE E bI DA 6 3 GENERAL DESCRIPTION eene enne nennen nnne nnne Ge AA Ge ee 7 3 1 nmi EE EO EE 7 3 2 Power Supply eswasteririmsssndinivitiatisdonisetieniise vie uv od eds ee 8 3 3 iS DEVICES N N EE eden ad N N 9 4 INSTALLATION oeste esse es see ee se ee nennt ntn Ge ee AA Ee sas AE ee aas ee Ge 9 4 1 Grouiiding m 10 4 2 6e ike o ME EO OI 10 4 3 Bose ke ME EE TR 10 4 4 Mamou EEA 11 4 5 Gee a A NE E Ne 11 2 OPERATION EE EE N LE DUE 12 5 1 Operation Elements ateis REEDE EE EN IIS tere EpL EI AR G 12 o Preparation for operation essent 14 Al Display Men NM 15 9 4 Settings MENU iss EE ERG Ms es De Ge ee taie Eaa 17 N ape NE RE EE
14. ck software version Page 20 from 35 SERUICE Time DOM ESC DOWN UP ENT PA switched OH Times 21h 3 N N ESC DOWH UP EHT SERUICE Faults ESC DOUH UP SERUICE Warnings ESC DOWH UP ENT LAST 36 WHRHINGS 323333535353 Use UP or DOWN button to select Time ON parameter Press ENT to see total operating hours of the PA Press ESC to go back to the Service menu Use UP or DOWN button to select Faults Press ENT to see fault numbers or letters see the table in chapter 6 Press ESC to go back to the Service menu Use UP or DOWN button to select Warnings Press ENT to see warning numbers or letters see the table in chapter 6 Press ESC to go back to the Service menu Page 21 from 35 SERVICE EBS1 automat DOWH UP EHT SERUICE EBS1 26 52A Ug 95 3U set to IP 26mA SERUICE EBS automat DOWH UP EHT SERUICE EBS 65 B 25H La 68 4U set to IP 256mA SERVICE Calibration Ir ESC DOWN UP SERVICE IF and Is is OK ESC DOWN UP ENT Use this procedure after replacing the tube This is step No 2 Scroll UP or DOWN to select EBS1 settings Press ENT to start automatic adjustment of EBS1 20 mA Automatically increasing of the grid voltage decrease of the negative value causes a gradual increase in the plate current In the moment when Ip reaches 20mA adjustment Stops Press ESC after stopping Use this procedure after replacing the tube This is
15. ctor position one step down for example from 230 to 220 VAC To start the second method of fine tuning press S2 TUNE button in OPER mode PA is in the operation mode After TUNE button S2 was pressed it changes its function Now STOP is blinking Do not press STOP button yet Apply input power according tune table or lower for selected band and press PTT Use TUNE knob to get maximum output power Use LOAD knob to get Is graph indicator within the boundaries Page 27 from 35 Display shows properly tuned PA TUNE indicator is in the middle Screen current is higher but still inside the limits After proper fine tuning release PTT and press STOP button PA is now prepared for operation View on the properly tuned PA Analog wattmeter shows forwarded and reflected power After this procedure the amplifier is tuned correctly and ready to give 1500 W output power in all operation modes At optimal tuning and full output power a positive max 50mA current goes through the second grid CAUTION If the amplifier demonstrate any malfunctions during tuning or it does not behave in accordance witch the description interrupt the tuning procedure immediately and check the amplifier Be sure not to do any mistakes in choosing bands or TUNE LOAD values Be sure that VSWR is not higher than 2 1 and input power is LOW After excluding possible human mistakes you will be able to work for long time with this amplifier 6
16. ed limits Turn LOAD knob slightly in arrows direction to get TUNE indicator between arrows RE EE HA UI EE ed Display indicates correct tuning of the Power amplifier Page 26 from 35 Remember Always use TUNE knob to get maximum output power Use LOAD knob to get TUNE indicator on the display to the middle position between both arrows Simultaneously check if Is graph indicator stays within the boundaries Repeat both steps more times Proper operation mode of FU 728F requires the plate voltage to be close to 3 kV If anode voltage without RF power is much lower watch the heating voltage too Normally heating voltage must be in boundaries from 8 5 to 9 V without RF signal DSP3 Heating voltage level is a reliable indicator of correct AC selector adjustment If you see heating voltage lower than 8 5V without RF signal change primary AC voltage selector one step down if possible Conversely if the voltage is higher than 9V try to move AC selector one step up for example from 220 to 230 VAC Check heating voltage under full load full output power also If the heating voltage without RF signal is OK but under full load drops more than 1 5 V this relates to the soft AC network and is solvable only by changing the AC network Without RF power the plate voltage is OK Without RF power the plate voltage is 2 85 kV Check the heating voltage too If it is below 8 5 V this indicates the need to change AC sele
17. ircuitry ensures a good input SWR better than 1 5 1 on all amateur bands Te amplifier is using a ceramic tetrode FU 728F in a grounded cathode circuit input into control Page 7 from 35 The output of the amplifier is a Pi L circuit The ceramic capacitor for TUNE and LOAD are divided This enables the amplifier to be tuned exactly and makes it possible to easily return to the previously set positions after band changes Top view on the opened OM2000 Tetrode FU728F Antenna Switch Blower Power Supply Board Switch ON Board TIE me fuu N m En amp X 1 PC B P x 4 a EA v ao nor I EMI d LJ pal Wy f N N WY aM LL 1 i q t v et 7 ue ye L S PTT a ina eri TREIN IN N n ELLE OD DOG E Output Pi L Circuit Tuning Capacitor Subpanel HV transformer 3 2 Power Supply Power amplifier is using one 3 KVA toroidal transformer A soft start is provided using relays and resistors placed on the switch ON board The high voltage is made by combining 4 x 530V AC total abt 2950V DC 1 2A Each has its own rectifier and filter In the high voltage circuit safety resistors are employed to protect the amplifier against overload placed on the power supply board The separated supply for screen grid is regulated by stabilization with MOSFET and delivers abt 330V DC at 100mA Control grid voltage is also stabilized 120V DC Change of stabili
18. lifier The KEY OUT socket is to be connected with the PTT socket at the transceiver The amplifier is eduipped with safety devices which ensure that the output relay is not switched under power mistakenly hot switching KEY IN RCA Phono Input signal PTT switching voltage current 5V 2mA KEY OUT RCA Phono Output signal PTT maximum switching of 30V 50mA 4 4 Main Supply CAUTION Be sure you got PA with properly terminated line cable corresponding with your power system s outlet If not contact your dealer In such a case you should make the necessary changes using a licensed electrician WARNING Be sure that your power system is correctly wired and properly rated To use adequately sized and connected grounding system is also very important 4 5 Cooling CAUTION The amplifier must be installed in such a way that free flow of hot air from the tube is allowed Do not obstruct air intake and exhaust areas of the PA The centrifugal blower provides basic cooling of the amplifier Blower is activated by switching the PA on and it is turned off when cooling is finished approx 1 5 min after switching off the PA depending on the temperature of the tube Blower speed 2 steps is setting automatically according to the tube temperature For long time operation contests the PA is equipped with an auxiliary fan which can operate in three modes go to Settings menu for more details Detailed view on the tube and
19. lue according to the AC voltage in your network Change the settings if necessary Side view on the opened OM2000 HV Transformer AC Selector Page 33 from 35 Remove the upper lid first On the right side of the PA next to the HV transformer there are two PCBs mounted On the left upper side of the front Switch ON board connector J6 is located Use flat screwdriver or finger and press carefully the white stick to release contact and move upper end of the white jumper to the proper position if necessary Jumper must be connected between bottom contact and one of remaining contacts AC voltage is marked next to every contact NOTE AC selector range can be changed in the production according to the specific conditions in individual countries 7 2 Removing the HV Transformer For simpler and easier transport of the PA HV transformer can be removed and taken separately This distributes the weight of the PA 24 kg about half and half Follow next steps to do it Remove upper lid from the PA Turn the PA on the left side transformer is up Disconnect 3 connectors from the front board and 1 connector from the rear board Release 4 screws from the bottom side of the PA Use Philips screwdriver P2 During the release of the last 2 screws hold the transformer by hand Do not worry about its weight it will move down just 1 cm and remains on the central rung of the PA 5 Use both hands to take transformer away from
20. on to set auxiliary fan working condition Press ENT to confirm settings Use UP or DOWN button to set first mode The fan will activate at a fixed temperature programmed in uP Press ENT to confirm settings Page 19 from 35 5 2 3 Service menu Use UP or DOWN button to set second mode The fan will activate together with PTT Press ENT to confirm settings Use UP or DOWN button to set the third mode The fan will turn always when PA will be ON Press ENT to confirm settings Press ESC twice to release Settings mode In the Service menu it is possible to verify software version This menu allows user to check total operating hours and listing in the memory where reported faults and warning messages are stored You can display particularly warning messages and particularly error messages See chapter 6 for more information regarding to warnings and faults occurrence There you can find a coding table together with a limited values for the safety circuits activation also In the Service menu a value of EBS1 and EBS2 can be automatically adjusted This is used for example when it is necessary to make adjustment after replacing the tube Automatic control of EBS however can be done at any time EBS1 default value is 20mA of Ip EBS2 default value is 250mA of Ip Use Service menu after replacing the tube This is step No 1 To enter Service menu go to the MENU first then press SERV button Use UP or DOWN button to che
21. r _ Reflected Power e Forward Power SWR e Plate voltage Up Plate current Ip Second and third line are divided to the left and the right side editable independently To each of these positions one of the 15 different parameters should be set If you finish first line settings press ESC to go back to the row selection To start edit second line press 2Row button Page 16 from 35 Second and third line programmable parameters are e Forward Power e Reflected Power e Input Power e SWR e TUNE e Temperature e Frequency e Plate voltage Up e Plate current Ip e Screen voltage Us e Screen current Is e Screen current graph e Grid voltage Ug e Grid current lg e Heating voltage Uf Settings menu S2 and S3 now changed their functions To edit left side of the second line press LEFT button Go UP or DOWN to select desired parameter Press ENT to confirm selection If you finish left side settings press ESC to go back to the side selection To start edit RIGHT button etc right side press Settings menu offers EBS settings factory default parameters restoring and display contrast settings software version 6 1 or higher Page 17 from 35 Electronic Bias Settings EBS is one of significant feature of the power amplifier It allows to set low plate current after pressing the PTT regardless of whether you have CW or SSB mode until RF signal is no present at the
22. restore starting message B x ON AIR STBY FAULT ON When warming time expires PA switches itself automatically to the STBY mode You have two possibilities now switch PA to OPER mode and start operation OR to go thru MENU and submenus to set display parameters some hardware parameters or to enter the service menu In the STBY or OPER mode Antenna output can be changed ANT1 ANT2 ANT3 by pressing S4 This feature is active also if PA is switched OFF However the main switch green must be ON in order to switch the antenna Display information can be changed too Press 3 to do it There are 3 different display settings possible in the OM2000 To set display parameters go to the next part of this manual for more details 5 2 1 Display menu The OLED display shows couple of parameters or texts Display has 4 lines Three of them are editable In every line user can select different parameters using MENU See next pictures Page 15 from 35 After pressing MENU S2 S1 S4 buttons changed their functions To edit display parameters press DISP button Press DIS1 to edit first display Now you can define parameters for first three rows Start with first line press 1Row button Go UP or DOWN to select desired parameter Press ENT to confirm selection There are 4 possible settings for the first line one bar graph or three pairs of different parameters e Forward bar graph e Forward Powe
23. s will turn the amplifier to STBY mode FAULT LED stays ON To cancel fault status press RESET shortly Power amplifier will stay in STBY mode All the warning and fault messages are stored in the memory You can display particularly warning messages and particularly error messages See the Service menu in the 5 2 3 how to select service display All of messages are stored and displayed as a numbers or letters as indicated in this chapter 1 9 A F They are stored one by one to the memory You can see them on the display in three lines on every second display position maximum 10 per row maximum 30 messages for warnings and 30 messages for errors If memory is full every new message will delete oldest one and move rest of them one position back It means that every time last 30 messages are visible on the display Next table shows limited values for the safety circuits activation Fault code Warning level Fault level 1 Power Output is too high 2200W 2300W 1700W 50MHz 1800 SOMHz Reflected power is too high 250W 300W Power Input is too high 100 W 120W LEN Low output power tune p 3dB below Page 29 from 35 6 Grdcwrntistoohgh ioma Xm 7 Swemcwrentitohgh soma eoma sd NR ENE TE ENTE Spa HARD FAULT from 3 1 version Plate current gt 2 5A K K Ok K Plate voltage error Min 1800V Min 1500V SOO NI Ma MN C Gidvotapisw Screen voltage error Min 250V Min 220V Ulo ER EE E SWRistoohigh
24. step No 3 Scroll UP or DOWN to select EBS2 settings Press ENT to start automatic adjustment of EBS2 250 mA Automatically increasing of the grid voltage decrease of the negative value causes a gradual increase in the plate current In the moment when Ip reaches 250mA adjustment stops Press ESC after stopping Use UP or DOWN to select Calibration Ip amp Is Press ENT to do it Ip and Is calibration runs in the background Result only is visible on the display Press ESC to go one level back Page 22 from 35 5 3 Operation mode CAUTION In STBY the amplifier is in bypass mode and your transceiver is directly connected to the antenna Maximum allowed power in bypass mode is 100 Watts Passing RF power is measured with analog wattmeter only It is not displayed if PA is either in standby mode or turned OFF 4 3 10 1 1 Pres OPER to activate operation mode fee STBY LED switched OFF ON AIR STBY FAULT ON Changing of DSP allows user to watch couple of basic parameters of the PA in operation mode without input RF signal Notice These are three default display settings software version 6 1 Check all connections again Set BAND selector TUNE and LOAD capacitors according to TCVR parameters and delivered tuning table see next part for more details Apply low input power and press PTT Check Analog wattmeter first Try to tune PA for maximum output power and minimum SWR Page 23 from 35 E a ON
25. t Suppression of harmonics lt 50 dBc Tubes FU 728F Ceramic tetrode Cooler Centrifugal blower Axial fan Power supply Switchable 220V 230V 240V 50 60 Hz Transformers One toroidal transformer 3kVA Dimensions 390 x 195 x 370 width x height x depth Weight 24 kg 1 2 2 Protection Circuits There are several protection circuits used in the amplifier They are activated when one or more of next parameters exceed defined values or some unwanted occasion occurs e VSWR too high e Anode current too high e Anode voltage error e Screen current too high Page 4 from 35 Screen voltage error Grid current too high Grid voltage error Heating voltage error Mistuning of PA Temperature to high Soft start for fuses protection switch on blocking at opened amplifier 1 2 3 Indicators Number of indicators visible on the front panel will inform you about value of some parameters or operation status OLED display 4 x 20 characters Analog Wattmeter Double system meter for forward and reflected power measuring LED Indicators ON AIR amplifier in transmitting mode STBY standby mode FAULT failure switching off for abt 4 sec ON ON status 1 2 4 Features Manufacturer implemented some of the company s current development results with most wanted operating and safety features into this new model High level of protections Antenna switch for 3 different antennas Memory for faults and warnings easy maintenance
26. the chassis xb add LE cm Watch the released terminals when moving the transformer Do not damage transformer insulation during removing and transportation Page 34 from 35 Weight of the PA was distributed transformer has 12 kg rest of the PA has cca 12 kg too When refitting the transformer watch to the correct location of individual sections and wires NOTE Manufacturer reserves the right to make future changes in the way of connecting the transformer to the board Allways mark the position of the terminals before disconnecting the transformer Page 35 from 35 Block Diagram of OM2000 Power Amplifier 7 3 CLOT SE OL TAH weiBeip 49019 0002 INO J824f13 Kx er quvosN338255 L OUYDBE LndN Af id NI by UL 3 Page 36 from 35
27. ytic capacitors to discharge fully Disconnect power cord from the outlet WARNING Any work inside the PA internal fuses replacement tube replacement etc can be carried out only by professionally qualified person Page 6 from 35 CAUTION The amplifier must be installed in such a way that free flow of hot air from the tube is allowed The amplifier must not be installed in a constrained surrounding i e tight shelves etc During long time operation ventilation grid can reach high temperature Do not touch it CAUTION The amplifier must be properly grounded during operation CAUTION During operation the amplifier must be installed in such a way that the rear side remains accessible CAUTION The amplifier is an A category product In a household it can influence other electric appliances In such cases the user is to take proper actions to mitigate this disturbance CAUTION Read this manual carefully Fallow all of instructions during installation and operation to avoid damage to the amplifier not covered by manufacturer s warranty Do not attempt to perform any change of hardware or software 3 GENERAL DESCRIPTION 3 1 HF part grids The OM2000 amplifier achieves excellent linearity by the voltage stabilization of the control grid bias and the screen voltage The power input is given to the control grids using a broadband input circuit with an input impedance of 50 Ohms This adaptable input c
28. zed first grid voltage is controlled by the software EBS for example Page 8 from 35 3 kVA toroidal transformer is visible on the left side Switch ON board is in the front Power supply board behind it CAUTION Primary section of the transformer is switchable for 220 240 VAC Factory setting is 230VAC If the AC voltage in your network is 220 or 240 Volts you need to set the correct value before first starting of the PA See part 7 1 for more information 3 3 Safety Devices Control and monitoring circuits ensure control and safety during malfunctions of the PA These are placed on the Control board which is located on the chassis subpanel One of the important safety element is mechanical switch for AC blocking at opened amplifier 4 INSTALLATION NOTE Read this chapter carefully prior you will start installation Before unpacking inspect shipping carton first if it is not damaged Keep all of packing parts for possible future shipment Check unpacked power amplifier If you find some damaging contact your dealer immediately to keep full warranty During installation go step by step according to the next parts Page 9 from 35 4 1 Grounding CAUTION The amplifier has to be grounded properly Connect the screw on the rear panel of the amplifier to your local grounding system with a copper cable use a cross section of 4 mm at least Connect your transceiver to the same grounding system of your shack
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