OM POWER OM2000+ Manual
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OM POWER OM2000+ Manual

Shortwave power amplifier
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MADE IN SLOVAKIA
OM2000+
SHORTWAVE
POWER AMPLIFIER
WWW.OM-POWER.COM
OM Power, s.r.o. 93030 Báč 126,
SLOVAKIA
Contact : +421 905 321 410
e-mail
: om-power@om-power.com
1
e-mail
: om-power@om-power.com

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  • Page 1 MADE IN SLOVAKIA OM2000+ SHORTWAVE POWER AMPLIFIER WWW.OM-POWER.COM OM Power, s.r.o. 93030 Báč 126, SLOVAKIA Contact : +421 905 321 410 e-mail : om-power@om-power.com e-mail : om-power@om-power.com...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. GENERAL INFORMATION ..............1.1. Introduction ……………………………………………………………. 1.2. Specification ……………………………………………………………. 1.2.1. Parameters ……………………………………………….…………. 1.2.2. Protection Circuits …………………………………………………………….. 1.2.3. Features ……………………………………………………………… 2. SAFETY INSTRUCTIONS …………………………………………………………….. 3. GENERAL DESCRIPTION …………………………………………………………….. 3.1. HF Compartment ………………………………………………………………… 3.2. Power Supply ………………………………………………………………… 3.3. Safety Devices ……………………………………………………………...….
  • Page 3 6.4. Cleaning ………………………………………………………….…. 7. APPENDIX ……………………………………………………………... 7.1. Primary AC selection ……………………………………………………………... 7.2. Removing HV transformer …………………………………………………………….. 7.3. OM2000+ firmware upgrade …………………………..…………………………………. 7.4. Control panel connectors pin-out …………………………….……………………………… 7.5. Block Diagram of the OM2000+ Power Amplifier …………..……………………. 7.6. Troubleshooting ………………………………………………………..……. 7.7. Factory reset ………………………………………………………………..

  • Page 4: General Information

    GENERAL INFORMATION 1.1. Introduction he OM Power model OM2000+ is designed for all shortwave amateur bands from 1.8 to 29.7 MHz (including WARC bands) plus 50 MHz and all modes. It is equipped with a ceramic tetrodes FU-728F. 1.2. Specification 1.2.1.

  • Page 5: Protection Circuits

    1.2.2. Protection Circuits There are several protection circuits used in the amplifier. They are activated when one or more parameters exceeds defined values, or some unwanted condition occurs. • VSWR too high • Anode current too high • Anode voltage error •...

  • Page 6: Safety Instructions

    SAFETY INSTRUCTIONS DANGEROUS HIGH VOLTAGE INSIDE! The power amplifier is using high voltage up to 3300 V 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 THE FOLLOWING SAFETY RULES! 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!

  • Page 7: General Description

    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 extended operation the tube ventilation grid can reach high temperature. Do not touch it! The amplifier must be properly grounded during operation During operation the amplifier must be installed in such a way that the rear side remains accessible.

  • Page 8: Power Supply

    Top view on the opened OM2000+ Tetrode FU728F Blower Power supply Board Switch-ON Board Output Pi-L Circuit Tuning Capacitor Front subpanel HV transformer 3.2. Power Supply This Power amplifier uses one 3 KVA toroidal transformer. A soft start is provided using relays and resistors (placed on the switch-ON board).

  • Page 9: Safety Devices

    The separate screen grid supply is regulated and stabilized with MOSFET circuits and delivers approx. 330V DC at 100mA. Control grid voltage is also stabilized (-120V DC). Change of stabilized first grid voltage is controlled by the software (EBS for example). The transformer primary is Tap adjustable for 220, 230, 240 V AC, 50 Hz.

  • Page 10: Coaxial Cable

    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, have problems with TVI/BCI or possible distortion of your transmitted signal.

  • Page 11: Cooling

    OM2000+ must be switched earlier than HF is applied (cold switching). Modern transceivers have a time delay between PTT switching and power output, we recommend setting the time delay to 15ms. 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 amplifier.

  • Page 12: Operation

    OPERATION Before switching PA on, make sure that amplifier is grounded, antenna or dummy load is connected, and line cord is plugged into the outlet. Be sure you have selected the proper AC input TAP (Sect 7.1) Do not turn PA on for at least 2 hours after unpacking and located in its operating location. Especially when amplifier is moved from a cold place to a warm one as condensation may develop.

  • Page 13: Om2000+ Control

    OPR/STBY Short press for switching between STBY and OPERATION mode. ON/OFF Long press (hold for a 1 sec.) for switching the PA ON (first start to tube heating), 2 seconds for PA OFF. Always first use the ON/OFF push button as this allows for a predetermined (software controlled) time to cool down the tube and inside the PA compartment.
  • Page 14 Screen shows settings possibilities for ANTENNA, DISPLAY, EBS, BLOWER and other INFO Type of supported TCVR and working Scroll for choose (up or down) and press SET frequency are visible on the display. AUTO LED is ON. Press ANTENNA SETTINGS. First select ANTENNA SWITCH (No switch, Standard).
  • Page 15 Next SETTINGS position is for display parameters. First choose the background Type of supported TCVR and working color. Scroll on it and choose the color frequency are visible on the display. (left/right). AUTO LED is ON. Press SAVE twice, then scroll to OWN CALL. Type of supported TCVR and working Press SAVE for your call sign edit.
  • Page 16 Next lines are for EBS (Electronic Bias Setting) ON/OFF and for EBS level selection. Type of supported TCVR and working We recommend EBS ON. See next comment for more details. frequency are visible on the display. AUTO LED is ON. Electronic Bias Settings (EBS) is a significant feature of this power amplifier.

  • Page 17: Preparing For Operation

    UPGRADE touch button should ONLY be Type of supported TCVR and working used if the EPROM or firmware files (or both) will be upgraded. In such a case see frequency are visible on the display. page 29. AUTO LED is ON. 5.3 Preparing for operation In STBY the amplifier is in bypass-mode and your transceiver is directly connected to the antenna.
  • Page 18 The Menu display allows the user to go deeper into the SETTINGS mode, MEASuring Type of supported TCVR and working mode or SERVICE mode. frequency are visible on the display. Press SETTING button. AUTO LED is ON. The LAST EV button allows the user to see last faults.
  • Page 19 Type in the actual setting of the primary voltage tap and press ENT. Type of supported TCVR and working Press EXIT twice to go back to the Menu frequency are visible on the display. display. AUTO LED is ON. This is not the actual physical setting of the primary voltage tap. It is just information for the processor, which protects the permitted limits (up or down) for a given value of the primary voltage.
  • Page 20 Green graph may show one of the user Type of supported TCVR and working selectable 8 monitored parameters. Select the frequency are visible on the display. wanted parameter from the list at the bottom of the screen and press SAVE AUTO LED is ON.
  • Page 21 We selected last 20 FAULTS to show. Type of supported TCVR and working frequency are visible on the display. Press EXIT AUTO LED is ON. Go to SET EBS1 AUTO and press SET. PA will automatically set 20mA on the tube. Type of supported TCVR and working When finished successfully, you will see SET frequency are visible on the display.

  • Page 22: Operation Mode

    Scroll to SWR PROTECT and press SET. This feature allows the user to switch OFF the Type of supported TCVR and working SWR protection. frequency are visible on the display. We recommend setting it to ON (SWR protection circuit will stay active, max. allowed SWR is 3:1).
  • Page 23 Now try to press PTT (foot switch for example). Type of supported TCVR and working We are now in TRANSMIT mode (without RF). frequency are visible on the display. Note the new TRANSMIT light indicator on the touch screen. AUTO LED is ON. NOTE: The OM2000+ is tested at factory at a maximum output power of 2000W into a 50 Ohm load.

  • Page 24: Maintenance

    • If you reached the desired maximum output power, and the PA Screen current is inside 0 / +20mA , then tuning process is finished. Notice 1: If the tuning process takes more than 1 minute, allow for a short break to prevent temperature overloading of the PA.
  • Page 25 Plate voltage error Grid voltage is low Screen voltage error SWR is too high Amplifier is too hot Most of the safety circuits are preset for two levels of activation. The first level is a warning level. In such a case a warning message appears on the display, but the power amplifier will stay in normal operation.

  • Page 26: Fuse Replacement

    Never try to change or move any part inside the amplifier except the tube or fuses. Substitution of parts may void intrinsic safety! Manufacturer’s contacts: OM POWER, s.r.o. 930 30 Báč 126 SLOVAKIA Email: om-power@om-power.co Array Solutions Dealer in the USA:...

  • Page 27: Appendix

    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 230V AC. Before first starting the PA we recommend checking that the correct value is selected according to the AC voltage in your network.

  • Page 28: Removing Hv Transformer

    AC selector range can be changed according to the specific conditions in individual countries. Default settings is 220, 230, 240V / 50Hz for EU market and 230, 240, 250v / 60Hz for USA market. If you need different settings in the range of 200 – 260V, this should be specified in the order! 7.2.

  • Page 29: Om2000+ Firmware Upgrade

    7.3. OM2000+ firmware upgrade Download the firmware upgrade software and latest firmware file for the OM2000+ from the official OM Power website http://www.om-power.com/downloads. Store it to OM2000+ folder created on your PC. NOTE: Use a serial null modem cable and connect to the PC port on the OM2000+ rear panel with a COM port on the PC.
  • Page 30 Turn on the power amplifier with the black ON switch on the front panel. Press SETTING to enter the SETTING Menu. Type of supported TCVR and working frequency are visible on the display. AUTO LED is ON. Choose INFO The INFO settings allow viewing all of the Type of supported TCVR and working previous PA INFORMATION screen plus the addition of one more touch key to enter the...
  • Page 31 When you see this screen on the PA, go to the PC and the PIC Loader software and press the SEND TO LINE button. Type of supported TCVR and working frequency are visible on the display. AUTO LED is ON. Press the SEND TO LINE button.

  • Page 32: Control Panel Connectors Pin-Out

    You will see this screen after the firmware was successfully loaded Usually, it takes about 30 seconds but Type of supported TCVR and sometimes it might take a little bit longer. working frequency are visible on the display. NOTE: Do not take any action until this screen disappears! AUTO LED is ON.
  • Page 33 KEY IN – RCA connector Input signal PTT switching voltage / current 5V /2mA) KEY OUT – RCA connector Output signal PTT (maximum switching of 30V / 50mA) ANT / BPF Connector - D-sub 15 male 1 - ANT data D - output BCD code - bit 3 for antenna switching 2 - ANT data C - output BCD code - bit 2 for antenna switching 3 - ANT data B -- output BCD code - bit 1 for antenna switching 4 - ANT data A - output BCD code - bit 0 for antenna switching...
  • Page 34 OM2000A+ can address up to 10 antenna port, see antenna BCD code table below Logic value Antenna port UNDEFINED ANT 1 ANT 2 ANT 3 ANT 4 ANT 5 ANT 6 ANT 7 ANT 8 ANT 9 ANT 10 UNDEFINED UNDEFINED UNDEFINED UNDEFINED...

  • Page 35: Block Diagram Of The Om2000+ Power Amplifier

    7.5. Block Diagram of the OM2000+ Power Amplifier...

  • Page 36: Troubleshooting

    7.6. Troubleshooting The OM2000+ power amplifier contains several protection circuits, which constantly monitor operation of the Amplifier. When the firmware defined parameters exceed defined operating levels, a WARNING appears in the LAST EVENTS window of the PA front panel. If some parameters exceed a defined critical level, a FAULT is activated and the PA will automatically switch to STBY mode.
  • Page 37 Check plate power supply High voltage supply fault. Check the fuses on HV board. Plate voltage error Grid voltage is low Check grid power supply Low voltage on the grid. Check fuse F9 on HV supply board. Check fuse F10 and F11 on HV supply board and fuse F1 on Check screen power supply Screen voltage error the Screen...

  • Page 38: Factory Reset

    7.7. Factory reset: In the case of very abnormal behaviour of the OM2000+ it is possible to do a factory reset. This will reset all the amplifier parameters back to the factory default values. Press and hold the ON/OFF button and press the green Main power switch for several seconds until the following display appears.

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