OM POWER OM2000A+ User manual

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MADE IN SLOVAKIA
e-mail : [e-mail]
WWW.OM-POWER.COM
OM Power, s.r.o. 93030 Báč 126,
SLOVAKIA
Contact : [phone]
e-mail : om[email protected]
OM2000A+
SHORTWAVE PLUS 50 MHz
POWER AMPLIFIER

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TABLE OF CONTENTS
1. GENERAL INFORMATION ..................................................................... 5
1.1. Introduction …………………………………………………………………. 5
1.2. Specification …………………………………………………………………. 5
1.2.1. Parameters …………………………………………………………………. 5
1.2.2. Protection Circuits …………………………………………………………………. 6
1.2.3. Features …………………………………………………………………. 6
1.2.4. The Advantages of OM2000A+ ………………………………………………… 6
2. SAFETY INSTRUCTIONS …………………………………………………………………. 7
3. GENERAL DESCRIPTION …………………………………………………………………. 8
3.1. HF part …………………………………………………………………. 8
3.2. Power Supply …………………………………………………………………. 10
3.3. Safety Devices …………………………………………………………………. 10
4. INSTALLATION …………………………………………………………………. 10
4.1. Grounding …………………………………………………………………. 11
4.2. Coaxial Cable …………………………………………………………………. 11
4.3. Control Cable …………………………………………………………………. 12
4.4. Cooling …………………………………………………………………. 12
5. OPERATION …………………………………………………………………. 13
5.1. OM2000A+ Front Panel …………………………………………………………………. 13
5.2. OM2000A+ Control ………………………………………………………………… 14
5.3. Preparing for operation ………………………………………………………………… 21
5.4. Operation mode …………………………………………………………………. 28
6. MAINTENANCE …………………………………………………………………. 32
6.1. Indication of Fault Conditions ……………………………………………………… 32
6.2. Fuse Replacement …………………………………………………………………. 34

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6.3. Tube Replacement …………………………………………………………………. 34
6.4. Cleaning …………………………………………………………………. 34
7. APPENDIX …………………………………………………………………. 34
7.1. Primary AC selection …………………………………………………………………. 34
7.2. Removing the HV Transformer …………………………………………………….. 36
7.3. Controlling OM200A+ with FLEX Radio Series 6xxx …………………………. 37
7.4. OM2000A+ Remote Control …………………………………………………………. 39
7.5. Remote Control using own public IP Address .................................... 44
7.5.1. Changing OM2000A+ connection settings ................................ 44
7.5.2. Setting up in the Remote software ............................................. 45
7.5.3. Remote Control without own IP Address, behind a router ....... 46
7.6. OM2000A+ firmware upgrade ……………………………………………………… 47
7.7. Icom connection with OM2000A+ ………………………………………………… 53
7.8. Yaesu plus BPF plus ANT Switch connection with OM2000A+ ………. 54
7.9. Control panel connectors pin-out …………………………………………………… 55
7.10. Block Diagram of the OM2000A+ Power Amplifier ………………………… 59
7.11. Troubleshooting ……………………………………………………………………………. 60
FCC ID: X8NX8NOM2000 for US Market

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1. GENERAL INFORMATION
1.1. Introduction
he OM Power model OM2000A+ is designed for all short wave amateur bands from 1.8 to 29.7 MHz (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 2000+ W in SSB/CW on HF bands, 1500 W in CW/SSB on 6m
1500 W in RTTY, 1500W for US models
Input Power Usually 40 to 60W for full Output Power
Input Impedance 50 Ohm, VSWR < 1.5 : 1
Power Gain 15 dB
Output Impedance 50 Ohm unbalanced
Maximum Output SWR 3 : 1
SWR protection Automatic switching to STBY, when reflected power
is 350W or higher
Intermodulation distortion 32dB below nominal output
Suppression of harmonics < -50 dBc ; <-70dBc on 50 MHz
Tubes FU-728F Ceramic tetrode
Cooler Centrifugal blower + Axial blower
Power supply switchable 220V, 230V, 240V, 50/60 Hz or other primary
voltages…. (200V 50/60Hz for Japan, 230, 240, 250V for US models)
Transformers One toroidal transformer 3kVA
Dimensions 390 x 195 x 370 (width x height x depth in mm), 15.3” x 7.7”x 14.5”.
Weight 24 kg (53 lb)
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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.
VSWR too high
Anode current too high
Anode voltage error
Screen current too high
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. Features
The manufacturer implemented some of the company’s newest development results with most wanted
operating and safety features into this new model:
High level of protection
Memory for faults and warnings, easy maintenance
Automatic set-up anode current (BIAS) –no need to adjust manually after changing the tube
Three programmable working modes of the 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 2000 W Power Amplifier on the market
1.2.4. The Advantages of OM2000A+
Full compatibility with: ICOM, ELECRAFT, KENWOOD, TEN-TEC ORION, YAESU, Icom
transceive protocol using by MicroHAM devices ( CI-V output ), FLEX Radios and Anan.
RF sensitive, that is why the PA is usable also with radios, which doesn´t have CAT. By NO
CAT using we recommend to use BAND DATA information due to the much faster band
changing. Possibility of using BAND DATA information.
Automatic switching between bands. Automatic tuning within the band according to segments.
Automatic switching of Band Pass Filter –BAND DATA output compatible with YAESU radios (BCD
code).
Automatic switching of Antenna switches. The maximum number of antennas is 10, controlled by BCD
output code.
Remote control possibility (remote software as accessory –no extra price) http://www.om-
power.com/download/HF PA_Manager_

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2. SAFETY INSTRUCTIONS
DANGEROUS HIGH VOLTAGE INSIDE!
The power amplifier is using high voltage up to 3200V 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!
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!
Never turn the amplifier on without the upper lid in place. DO NOT ATTEMPT TO SHORT OR BYPASS safety
switch under upper lid!
The OM2000A+ amplifier is neither to be used in a WET or HUMID environment nor to be exposed to RAINFALL!
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!
Before opening the upper lid of the amplifier make sure that power supply has been disconnected AT LEAST 10
minutes allowing the electrolytic capacitors to discharge fully. Disconnect power cord from the outlet!
Any work inside the PA (internal fuses replacement, tube replacement, etc.) can be carried out only by
professionally qualified person!

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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!
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.
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.
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
his amplifier is using a ceramic tetrode FU-728F in a grounded-cathode circuit (input into control grids). The
OM2000A+ 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 circuitry ensures a good input SWR (better than 1.5 : 1) on all
amateur bands.
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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 OM2000A+
Tetrode FU728F Blower Power Supply Board Switch-ON Board
Output Pi-L Circuit Tuning Capacitor Front Subpanel HV transformer

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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 575V AC (total abt. 3200V 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 stabilized first grid voltage is controlled by
the software (EBS for example).
Primary section of the transformer is adjustable for 220 - 240 VAC (230 –250VAC for US). 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. Other primary voltage is possible on request
(for example 200V 50/60 Hz for Japan).
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
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.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.

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4.1. Grounding
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 mm2 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 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. At the INPUT and OUTPUT SO-239 sockets with Teflon insulation are used.
Rier view of the amplifier OM2000A+
Fuses Mains Plug HF Output
Blower Grounding point Control HF Input