Všeobecný popis KV zosilnovaca OM2500
Contents
1. 28 Example of connection with Antenna switch and 29 Example of connection USB micro KEYER II with 1678500 0r 17700 30 Example of connection USB micro II WithaHother ICOM et dodan ho td ras 31 Example for connection USB micro KEYER II With Yeasu or etos 32 Example of connection PA with MicroHAM MK2R etc rH Bb 33 Block Diagram of OM2500A Power Amplifier USA version 34 1 GENERAL INFORMATION Introduction The OM Power model OM2500A 1s a fully automatic power amplifier designed for use on all short wave amateur bands from 1 8 to 29 7 MHz including bands and all modes It 15 eguipped with one GU84b ceramic tetrode THE ADVANTAGES OF OM2500A Full compatibility with ICOM ELECRAFT KENWOOD TEN TEC ORION YAESU Icom transceive protocol using by devices CI V output Automatic switching between bands Automatic tuning within the band according to segments Automatic switching of band pass filter Automatic switching of antenna switches The possibility to use 2 different antennas within one band or segment 1 2 Specification 1 2 1 Parameters Freguency Coverage Power Output Input Power Input Impedance Power Gain Ou2. O LMS HADOL HOLOW VOOSZ WO 34
3. VOOSCINO 1 1 U21I S INV GNO XL viva CINVS diINOOOLLA 7 5 Example of connection USB micro II with 7800 1 7700 yod gsn MAA VOOSCINO YADL AID LNO NI A3M INV OHINOO OV LAdLNO INV 03 ALOWSY O ld L OV cov AVIAN 310NW3H 20260584 AGO VINY LNY cLNV LINY 008401 00 2221 Example of connection USB micro II with another Icom 7 6 gsn VOOSCINO AID LNO NI 60 ddd INV 1 1 INV ALOWSY NAD 5 OQ wooo 31 Example for connection USB micro KEYER II with Yeasu or V EN LIGIHNI Vivd ddd 3 INV LAVYDAI3 NSAVA VOOSZINO INV 32 7 8 Example of connection PA with MicroHAM 2 with CI V output HV3H VOOSCINO gsn LAdLNO AID LNO NI A3 IE IO 8 INV LAdLNO INV 03 SU OOO QN9 XL 1 NSAVA 33 Block Diagram of the OM2500A Power Amplifier AAS
4. Instruction Manual 2500 SHORTWAVE POWER AMPLIFIER OM POWER s r o 93030 126 SLOVAKIA E mail om power om power com TABLE OF CONTENTS 1 1 12 1 2 1 12222 12253 2 SP 3 2 3 3 4 1 4 2 4 3 4 4 4 5 4 6 Sol 9 21 2 21 2 2 2 2 219 5 2 4 5 2 3 5 2 6 232 T GENERAL INFORMATION OQ LOB REESE ATE t desk tenes 4 4 led M E HH 4 Probecton CGS 4 WCC UTE 5 DARE LX INSTRUCTIONS Gass sate sites ts 5 GENERAL DESCRIPTION T PIE DAL 7 POWCP UDD 9 DEVICES 8 INSTEALEATION 8 enn AA RA whi VE 9 oko a a kt be 9 VOBoxand Interfaee xis 9 NAS UDP rc 12 eap c M 12 COMUOL E voi rem a EE ERES 12 OPE RATION DUI I ME 12 Operan EMEN oexaqucesc dee Ex e PE d Ue NR PUE dunes 13 Configuration of Power Amplifier 15 TC MI 15 Connection with
5. be used in WET or HUMID environment nor to be exposed to RAINFALL WARNING Do not turn the amplifier on without having connected the ANTENNA 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 5 minutes allowing the electrolytic capacitors to discharge fully Disconnect power cord from the outlet 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 the top cover of the PA in these places during operation 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 Make sure that all screws holding the case together are properly in place and tightened before carrying the amplifier with the handles CAUTION Read this manual carefully Fallow all of instructions during installati
6. no supported TCVRS 16 COMMUNICATION LOSS ouxxeveureesin ora m detec tar dU 17 Antenna Switching Menu ERR 17 Bandpass Filter E EIUS 18 Loading Factory Default Settings 2 7 1 18 oer 19 5 2 8 5 2 9 M9 53 2 9 95 6 1 6 2 6 3 6 4 Tal 1 2 gd 7 4 7 6 Tals 7 8 7 9 BCD 20 Operation in MANUAL Mode 2 20 Tunis or POWerunplHer 20 21 Manual Tunne InStEUCHOBS 52 e boh EE ae ORE M 21 aaa iub temo nie m nde 23 MAINTENANCE 24 Indication of Fault Conditions 42 doe EO A deda a A d n da 24 Fuse O 25 Tape N 25 ET 25 APPENDDE 26 Example of connection for ICOM 202 2 26 Example of connection for ELECRAFT 24 Example of connection with YAESU
7. SU Press SET button and scroll using UP DWN to CHOOSE TUNE AUTO MAN UF SET TUNE AUTO MAN 15 Confirm CHOOSE by pressing SET again and scroll UP DWN to your transceiver type Confirm the selection by pressing SET Continue by selecting Baud Rate Press SET button and scroll using UP DWN to BAUD RATE Press SET again Baud rate for TC VR PA communication 15 shown on the LCD display SET AUTO By scrolling UP DWN select desired Baud Rate which must be the same as baud rate used by your transceiver please refer to your transceiver user manual To confirm your selection press SET When using Yaesu TCVR you need to configure the STOP BIT parameter correctly and confirm selection with SET The communication settings menu can be left by pressing the AUTO button amplifier will enter AUTO mode only if all settings are correct and connection has been established with your transceiver You can verify that the correct frequency and transceiver type is shown on the LCD display 5 2 2 Connection with not supported TCVRs For communication with TCVRs that are not supported by OM2500A for example JST 245 and older types of Kenwood an external IF 232 converter is to be used You can also use devices from several companies that produce compatible CI V output which deliver frequency information in ICOM format through the CI V output Then the PA will be connected in the following config
8. ansmit and increase driver power to cca 10W oo aem CAUTION If the input power is higher than 15W and the power amplifier is not correctly tuned the safety devices will switch to STBY The amplifier will automatically reset and switch back to OPR mode after approximately 2 seconds Meanwhile reduce the input power 8 Set TUNE knob in such a way that the TUNE LED lights up maximum left multimeter 1n TUNE position 9 Set LOAD knob in such a way that the TUNE LED on the TUNE scale lights up under the V sign If it 15 possible to obtain the LOAD 2 positions set the position that 15 further to the right 10 Repeat tuning several times according to 8 and 9 output power should be abt 500W 11 Increase the input power to about 50W until an output power of approximately 2500 will be reached 12 Repeat steps 8 and 9 13 Set TUNE knob to maximum output power RF POWER LED lights up max right After this procedure the amplifier 1s tuned correctly and ready to give 2500W output power in all operation modes At optimal tuning and full output power a positive max 50mA current goes through the second grid On 24 and 28 MHz bands optimal tuning can be achieved when one or two LEDs are lit up to left from the position If less output 15 desired you can simply decrease the load of the transceiver 22 CAUTION Should the amplifier demonstrate any malfunctions during tuning or should it not behave in accordance witch
9. d for switching of external HP or external Antenna Switch Maximum switching of 30V 0 5A 1s possible PIN OUT antenna port antenna port 2 antenna port 3 antenna port 4 antenna port 5 antenna port 6 antenna port 7 antenna port 8 9 antenna port 9 10 antenna port 10 11 COMMON port of ANT SW 12 NC 13 GND 14 BPF 160m 15 BPF 80m 16 BPF 40m 17 BPF 30m 18 BPF 20m 19 BPF 17m 20 BPF 15m 21 BPF 12m 22 BPF 10m 23 COMMON BPF port 24 NC 25 GND z 11 4 4 Mains Supply WARNING The power Amplifier OM2500 HF has to be connected TO THE MAINS WITH BOTH CABLES The amplifier reaches optimal parameters in the system with 2 phases Every phase has to be able to deliver 2 5 If you do not have 2 phases system connect both mains cords into the same phase In such a case system has to be able to deliver 4 5 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 T
10. d fuse fuses inside the power amplifier contact your dealer please 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 tube and how to preset proper parameters too Be very careful you will do it only on your own risk If you are not comfortable to replace vacuum tube itself contact your Service Center please 6 4 Cleaning To prevent damage of amplifier surfaces 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 25 APPENDIX 7 1 Example of connection for Icom 7 VOOSCINO INV 0 22719 1 03 gt Q 0 XUL 26 Example connection for 72 VOOSCINO INV IOHINOO 1144110 INV 122 XUL 27 Example of connection with Yeasu 7 3 zez SU WOO PATHE YADL AID LNO NI ddd I NY IOYLNOD OV MIIA VOOSCINO 1 1 LNV 03 dINOOOLLSA 28 7 4 Example of connection with antenna switch and 19 ssedpueg 5 INV 104 41 MIIA
11. e connected to the input of the amplifier via RG58 similar cable For the connection between the power amplifier and the antenna RG213 similar coaxial cable suited for high power is recommended Both the INPUT and OUTPUT SO 239 sockets with Teflon insulation 15 used Rear view of the amplifier OM2500A AC Sockets Fuses OUTPUT REMOTE I O Interface INPUT 4 3 Box and Interface Control of Amplifier and communication with TCVR as well as Antennas BPF switching can be done via the rear panel I O Interface 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 15 connected to the ground The relays of the OM2500A have to be switched earlier than HF is applied cold switching Modern transceivers they have a time delay between PTT switching and power output CAUTION If you are using and 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 amplifier The KEY OUT socket is to be connected with the PTT socket at the transceiver The amplifier is equipped with two safety devices which ensure that the output relay 1s not switched under power mistakenly hot switch
12. e safety devices switch the PA to STBY You must decrease the input power CAUTION In SSB mode you will have good output power if the green LED lights up a bit The current of screen grid is measured and shown in a Bar graph Indicator The amplifier has to be tuned in such a way that the current is between 20 mA to 50 mA At currents beyond these values the operating point will be shifted and IM products will be rapidly increased If a value of 70mA is exceeded the safety devices will switch the amplifier to STBY mode 5 3 1 AUTO or MANUAL There are two possibilities of operation mode in OM2500A AUTO or MANUAL Normally when you are using CAT interface connection between TCVR and PA in AUTO mode PA will tune automatically to the TCVR frequency If you do not have or use CAT connection you will use MANUAL mode You must manually select proper band and segment corresponding to 5 band and frequency Then OM2500A will tune automatically to this manually selected band segment 5 3 2 Manual tuning instructions OM2500A has been design to deliver maximum output power at 50 Ohms load Parameters for PA auto tuning using real 50 Ohm loads are stored in the memory factory default To deliver maximum output power to a real load you need to adjust the tuning according to your real antenna impedance This has to be done manually in TUNE mode see 5 3 3 for details First off all PA must be switched on 1 Set the multimeter
13. en Ig2 10 LED Anode voltage anode current tuning 30 LED LED Indicators Current at control grid 181 2 LED WAIT preheating of tube 150 sec SIBY standby OPR operation condition FAULT failure switching off for abt 4 sec INHIBIT operating condition ANT 1 which ANT is in use ANT 2 which ANT is in use ANT ANT selection Buttons UP DWN listing in menu MAN manual operating AUTO automatic operating TUNE tuning SET confirms selected parameter OSD Indicator LCD Display 2 x 16 characters 2 SAFETY INSTRUCTIONS WARNING DANGEROUS HIGH VOLTAGE The power amplifier is using high voltage up to 2800V 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 play around to touch power amplifier or connected cables in working condition or to push anything into the case holes WARNING The amplifier contains hich voltage circuits Never turn the amplifier on without the upper lid in place DO NOT ATTEMPT TO SHORT OR BYPASS safety switch under upper lid WARNING OM2500 HF amplifier can be operated ONLY if both of supply cables are connected The amplifier reaches optimal parameters 2 5 system if you do not have 2 phases connect both mains cords into the same phase WARNING The 2500 amplifier is neither to
14. f anode currency by bar graph FAULT fault OPR amplifier in operation mode STBY amplifier in standby mode WAIT heating of tube after switching on the amplifier NOTE Should a fault condition appear during the tuning or operation of the amplifier the safety circuits of OM2500A will react The amplifier will be turned to STBY mode After approx 4 sec the control circuits will switch the amplifier back to OPR CAUTION If the fault will repeat 3 times after each other the control circuits will turn the amplifier to STBY mode Bringing the amplifier back to OPR mode is enabled by using the OPR STBY switch only After reaction of safety circuits the FAULT LED will be lit up for approx 5 sec depending on the nature of the fault Flashing LED signalizes IP anode currency exceeded HV low anode voltage FAULT reflected output exceeded GRID MAX first grid currency exceeded screen grid currency exceeded GRID HV maximum load power exceeded GRID MAX IP zero output power during tuning IP tuning fault incorrect tuning of the P1 L output circuit In case your OM2500A amplifier is not working correctly please contact the manufacturer or your dealer Manufacturer s contacts OM POWER s r o 930 30 126 SLOVAKIA Email om power om power com 24 6 2 Fuse Replacemeent The user 15 allowed to change mains fuses 6 3 x 32mm accesible from the rear panel only In the case of interrupte
15. h SET configuration continue to the other antenna selection port selection To finish Antennas switch configuration you can either press AUTO or MAN 5 2 5 Bandpass filter switching Switching of external band pass filters 15 automatic and needs to follow pin out of BPF connector For more details see Example of connection with antenna switch and in Appendix 5 2 6 Loading factory default settings In the rare case of needing to restore factory default settings press SET and scroll using UP DWN to LOAD DEF VALUES and confirm by SET 18 SETTINGS DEF VALUE LOAD DEF VALUES TES PUSH SET SET TUNE AUTO MAN SET AUTO Then select if you want to erase all settings pressing TUNE just one setting value SET button In the case of resetting a single parameter use UP DWN to select which option and confirm by SET TO PUSH FUSH 5 SET TUNE AUTO 5 2 7 MUTE option When operating the OM2500A with an Icom transceiver without TX INHIBIT for disabling TX we recommend blocking of the TX while tuning using ALC control mainly while operating RTTY AM ALC Input of your transceiver should be connected to the ALC Out of OM2500A Using SET and scrolling UP DWN select SET MUTE and confirm it by SET Then configure MUTE LEVEL for each band so results in no power being transmitted by when perfor
16. he centrifugal blowers provide the necessary cooling of the amplifier even during long contests The main blower 15 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 The supplemental fan is turned on depending on the temperature of the air exiting from the amplifier It is switched on at 70 C and switched off at 60 C 4 6 Remote Control Control of the amplifier is possible remotely by using REMOTE BOX optional Connection is done by REMOTE socket maximum cable length of 10 meters 5 OPERATION WARNING Before switching PA on make sure that amplifier is grounded antenna or dummy load is connected line cord is putted to the outlet CAUTION Before switching PA on check all connections between PA and TCVR 12 CAUTION Do not turn PA for at least 2 hours after unpacking it and locating 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 avoid warranty loss NOTE When you decide to have a short operating break place the amplifier in the standby mode rather than switch off 5 1 Operation Elements There 15 couple of operational elements accessible or visible on the f
17. ing KEY IN KEY OUT ALC RCA Phono Input signal PTT switching voltage current 5V 2 mA Phono Output signal maximum switching of 30V 50mA Mono 3 5mm Jack for connection of ICOM or devices that provide compatible CI V protocol Correct baud rate 15 important DB9 serial port RS232 for KENWOOD YAESU and ELECRAFT TCVRs Correct baud rate and type is required for successful operation If both CI V and TCVR cables are connected then CI V disables RS232 Otherwise selection of interface is done via TCVR type DB 9 RS232 port is used for communication with your PC Please use setting you would normally use if using direct TCVR PC connection RCA Phono Automatic Level Control is used when tuning the PA to block drive level CAUTION We only recommend using ALC feature while operating RTTY FM and other 100 duty modes CONTROL The CONTROL socket is a single DB 15 connector that provides many connections to the amplifier from your transceiver Use shielded cable for all connections to this connector You will need to fabricate a cable with the proper connector for your transceiver or use individual connectors as described below 10 1 ALC Out 2 3 INHIBIT Control voltage 4 TX INHIBIT for Yaesu and Elecraft this supersedes ALC output 5 NC 6 KEY OUT 7 NC 8 KEY IN 9 1 5 GND amp BPF SW DB 25 is use
18. l stay lit until the KEY IN 15 released and the tuning process will start After that PA 15 automatically ready for operation ANT ANT1 ANT2 The amplifier is capable of automatic antenna switching 80m CW and 80m SSB be split between two antennas The amplifier will automatically select desired antenna by selecting last used antenna on a given frequency SET button for MAIN MENU Confirmation of selection Saving of selected value Saving of tuning parameters 14 TUNE Push button for selection of TUNE mode AUTO Push button for selection of AUTOmatic mode MAN Push button for selection of MANUAL mode DWN UP Push button for selection of band segment or parameter 5 2 Configuration of Power Amplifier When the ON button is pressed the amplifier will start to heat the final amplifier tube During the warm up period the STBY and WAIT LEDs will be illuminated If a transceiver 15 connected to the correct port and all communication settings are right the operating frequency AUTO and the type of transceiver will be indicated on the alphanumeric display After successful heating of the TUBE you can enter operating mode by pressing the OPR button Example of Automatic mode with ICOM TCVR Type of supported TCVR and working frequency are visible on the display SET AUTO DWN UP AUTO LED 15 ON 5 2 1 TCVR Support Settings Supported transceivers ICOM ELECRAFT KENWOOD TEN TEC ORION YAE
19. ming TUNE procedure SETTINGS MEHL 3 5 MHz SET OF MUTE 0 SET TUNE AUTO MAN DWN UP SET TUNE AUTO MAN DWN UP 5 2 6 LCD Settings Menu pressing SET and scrolling UP DWN and selecting LCD CONTRAST Confirming SET and pressing Up or DWN you can vary the Contrast of the LCD display Press SET for confirm the setting SET TUNE AUTO ja AUTO 5 2 9 Operation in MANUAL mode SET TUNE AUTO Li To enter Manual mode of the PA please press MAN By pressing MAN repeatedly you select BAND and band segment You can control the segment or band by scrolling the UP DWN buttons 5 3 Tuning of Power Amplifier The OM2500A amplifier is operated 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 WARNING Before starting tuning you have to check if the right antenna or a 50 Ohms load resistance is connected at the antenna output CAUTION The operation of a mistuned PA will cause malfunctions the increase of grid current the GRID MAX LED will light up and problems with TVI BCI 20 CAUTION The grid current is shown with 2 LED diodes It s normal if the green LED is flashing or may be shining a little bit during peak operation If you overload the amplifier the output power increases the grid current at very small rates and red GRID MAX LED is shining and th
20. on 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 In this amplifier a tetrode GU 84b is used in a grounded cathode circuit input into control grid This 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 grid using a broadband input circuit with an input impedance of 50 Ohms This adaptable input circuitry ensures a good input SWR better than 1 2 1 on all amateur bands 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 the opened 2500 Tetrode GU84B PWR meter Blower Switch on board A pe E UNH Output Pi L Circuit Tuning capacitor Power supply board Subpanel 3 2 Power Supply Power supply of the amplifier 1s comprised of two of 2 0 kVA toroidal transformers A soft start is provided using relays and resistors The high anode voltage 15 made by combining 8 x 350 V total 2800V 2A Each has its own rectifier and filter In the high voltage circuit safety re
21. ront panel FAULT TUNE Anode capacitor for tuning tuning of higher frequencies to 0 lower frequencies to 100 LOAD Output capacitor tunes antenna load resistance to amplifier Capacity 15 low at 100 and high at 0 on the scale OFF You switch off amplifier by pressing this button ON You switch on the amplifier by pressing this button After 3min of warm up delay the amplifier will be ready for operation 13 OPR STBY OPERATE sets the amplifier ready for transmit operation In STBY if WAIT LED 15 on amplifier is OFF the amplifier is in bypass mode and your transceiver is directly connected to the antenna Maximum allowed power in bypass mode 1s 400 Watts RF OUTPUT Bar graph shows output power REFLECTED POWER Bar graph shows reflected power from the antenna Maximum level is 350W otherwise amplifier switches to STANDBY mode Ig2 Bar graph measures the current of second grid from 20mA 80mA graph measure anode voltage anode currency or tuning of amplifier Fa INHIBIT ANT i ANT 2 SET TUNE AUTO J ANT M INHIBIT Indicates interruption of transmission during the tuning process of the PA If indicated by RED LED then PA 5 in STBY mode If during a retune operations within the same BAND then the PA will retune according to the freguency of transceiver When changing the BAND INHIBIT wil
22. sistors are employed to protect the amplifier against overload The source for screen grid is regulated by parallel stabilization with BU941 NPN Darlington transistors and delivers a voltage of 350V at 100mA The 120V for the control grid 15 regulated with zener diodes 3 3 Safety Devices Control and monitoring circuits ensure control and safety during malfunctions of the PA These are on the Control board which is located on the chassis subpanel 4 INSTALLATION NOTE Read this chapter carefully prior you will start installation Before unpacking inspect shipping woody container first if it 15 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 next parts 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 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 b
23. switch to the HV position 2 Set the OPR STBY switch to the STBY position 3 Press the ON button The amplifier is prepared for operation with the following automatic steps Toroidal transformers are switched on step by step The cooling blower for the final tube is switched on The multi meter bar graph measures the high voltage the normal value 1s 2 8 kV The WAIT LED lights up 21 CAUTION After switching on please confirm that the blower is operating properly Air must be flowing from the ventilating aperture above the tube If there is any concern or no air flow press the OFF button immediately Heating of the tube takes about 150 seconds After this time the WAIT LED goes out and amplifier 15 ready for operation Enter TUNE mode Depending on the input power level and antenna parameters two situations can occur First when your antenna parameters are close to real 50 Ohms input power not exceeds allowed maximum PA stay in OPR mode and you will see the output power You have to do just little adjustment steps 8 9 12 13 to get maximum output power Second if your antenna parameters are not very good and input power 15 higher than 15watts safety devices will switch PA automatically to STBY In such a case start with step 4 go thru all next steps Reduce the power output of your transceiver to the minimum Switch OPR STBY to OPR position OPR LED lights up Choose the TUNE position of multimeter Tr
24. the description interrupt the tuning procedure immediately and check the amplifier Be sure to have not done 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 5 3 3 Tuning Adjustment Entering the TUNE mode is done by pressing the TUNE button The OM2500A then switches the transceiver to RTTY and sets the frequency to corresponding segment By changing the values of TUNE and LOAD capacitors we tune the PA as per manual tuning instructions see 5 3 2 The optimally tuned amplifier will deliver full output without approaching the maximum Screen Current of 50mA After tuning the amplifier save the settings by pressing SET and PA will automatically tune frequency of your transceiver to next band segment Follow the same procedure for all bands and segments if needed SET TUNE AUTO MAN gt pressing MAN AUTO buttons and will return to standard operating mode Dividing of bands into segments 1 8 Width of the segments 15 30 30 30 30 50 60 60 70 23 6 MAINTENANCE 6 1 Indication of fault conditions OM2500A has the following indication LED on the front panel GRID MIN indication of first gird current GRID MAX max First grid current exceeded HV measuring of anode voltage by bar graph IP measuring o
25. tput impedance Maximum output SWR SWR protection Intermodulation distortion Suppression of harmonics Tuning Response speed of AUTO Tube Cooler Power supply Transformers Parameters Weight Amateur Bands 1 8 29 7 MHz including WARC 2500 W SSB and CW 2000 W in RTTY AM and FM Usually 60 to 80W for full output power 50 Ohm VSWR lt 1 2 1 17 dB 50 Ohm unbalanced 21 Automatic switching to STBY when reflected power 15 350Wor higher 32 dB below nominal output lt 50 dBc Manual or AUTO Less than 0 5 sec within the same band Less than 3 sec if out of the band GU84b Ceramic tetrode Centrifugal blower axial blower 2 x 230 V 50 Hz one or two phases 2 pcs of toroidal transformer 2 0 kVA 485 mm x 200 mm x 455 mm width x height x depth 40 kg 1 2 2 Protection Circuits There 8 special protection circuits used the amplifier They are activated when one more of next parameters exceed defined values or some unwanted occasion occurs VSWR too high Anode current too high Screen current too high Grid current too high Mistuning of PA Hot switching protection Soft start for protecting your fuses switch on blocking at opened amplifier 1 2 3 Indicators There are couples of LED and bar graph indicators visible on the front panel to inform you about value of some parameters or operation status Bar graph indicators Power output 50 LED Reflected power 20 LED Current at scre
26. uration JST 245 lt gt DB37 JST 245 cable lt gt or other device which has a CI V output lt gt OM2500A 15 connected to the CI V output of the CI V device MicroHam for example 16 Example of communication SET TUNE AUTO MAN SET TUNE AUTO 5 2 3 Communication loss If TCVR is not connected communication settings are incorrect the message COMMUNICATION LOST will be displayed You can still use PA by entering MANUAL mode MAN Button or by correcting the transceiver connection problem Example of Communication loss message SET TUNE AUTO MAN 5 2 4 Antenna Switching Menu If you have 3 party external antenna switch connected to your amplifier i e MicroHAM TEN SWITCH you need to configure the assignment of each port to a specific band or antenna By pressing SET and scrolling to ANTENNA SETTINGS confirming by SET you get current band and its antenna selection By scrolling UP DWN you can select BAND which you want to assign to current ANTENNA selected 17 SET TUNE AUTO MAN Then select how many antennas you want current band 1 2 and always confirm your selection by pressing SET The by scrolling UP DWN you assign which PORT 15 used your external antennas switch for this particular antennas ANT 1 ON PORT 01 DWN Ul AUTO Shall you decide to use 2 antennas for this band then after confirming that wit
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