OM POWER OM2000+ User manual

MADE IN SLOVAKIA

e-mail : om-power@om-power.com

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

OM2000+

SHORTWAVE

POWER AMPLIFIER

TABLE OF CONTENTS

1. GENERAL INFORMATION .................................................................... 4

1.1. Introduction ……………………………………………………………. 4

1.2. Specification ……………………………………………………………. 4

1.2.1. Parameters ……………………………………………….…………. 4

1.2.2. Protection Circuits …………………………………………………………….. 5

1.2.3. Features ……………………………………………………………… 5

2. SAFETY INSTRUCTIONS …………………………………………………………….. 6

3. GENERAL DESCRIPTION …………………………………………………………….. 7

3.1. HF Compartment ………………………………………………………………… 7

3.2. Power Supply ………………………………………………………………… 8

3.3. Safety Devices ……………………………………………………………...…. 9

4. INSTALLATION ……………………………………………………………... 9

4.1. Grounding ……………….…………………………………………….. 9

4.2. Coaxial Cable …………………………………………………………….. 10

4.3. Control Cable ……………………………………………………………... 10

4.4. Cooling ……………………………………………………………... 11

5. OPERATION …………………………………………………………..…. 12

5.1. OM2000+ Front Panel ………………………………………………………….…. 12

5.2. OM2000+ Control …………………………………………………………..… 13

5.3. Preparing for operation …………………………………………………………..… 17

5.4. Operation mode ………………………………………………………….…. 22

6. MAINTENANCE ………………………………………………………….…. 24

6.1. Indication of Fault Conditions …………………………………………………………….. 24

6.2. Fuse Replacement ……………………………………………………………... 26

6.3. Tube Replacement ……………………………………………………………... 26

6.4. Cleaning ………………………………………………………….…. 26

7. APPENDIX ……………………………………………………………... 27

7.1. Primary AC selection ……………………………………………………………... 27

7.2. Removing HV transformer …………………………………………………………….. 27

7.3. OM2000+ firmware upgrade …………………………..…………………………………. 29

7.4. Control panel connectors pin-out …………………………….……………………………… 31

7.5. Block Diagram of the OM2000+ Power Amplifier …………..……………………. 34

7.6. Troubleshooting ………………………………………………………..……. 35

7.7. Factory reset ……………………………………………………………….. 37

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. 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

1200 W in RTTY and DIGI modes ( 50 MHz 800 W )

Input Power Usually 40 to 60W for full Output Power ( USA )

20 to 30W ( World Gain model )

Input Impedance 50 Ohm, VSWR < 1.5 : 1

Power Gain 15 dB ( USA ), 17 – 18dB ( World Gain model )

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 on HF, <-70dBc on 50 MHz

Tubes 1 x FU-728F Ceramic tetrode

Cooler Centrifugal blower + Axial blower ( external )

Power supply switchable 220 ,230V, 240 V – 50 Hz

(230, 240, 250V - 60 Hz for North America models)

Current max. 20 Amps (recommended minimal IE 20Amps Circuit breaker)

Transformers One toroidal transformer 3 kVA

Dimensions 390 x 195 x 370mm (width x height x depth)

Weight 24 kg (53 lb)

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

• Screen current too high

• Screen voltage error

• Grid current too high

• Grid voltage error

• Heating voltage error

• Mistuning of PA

• Temperature too high

• Soft start for fuse protection

• “switch-on blocking “at opened amplifier

1.2.3. Features

The manufacturer implemented some of the company’s newest development results with the

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

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!

Never turn the amplifier on without the upper lid in place. DO NOT ATTEMPT TO SHORT OR BYPASS

safety switch under upper lid!

The OM2000+ amplifier should not be used in a WET or HUMID environment or 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 removing the upper cover of the amplifier make sure that power supply has been disconnected

AT LEAST 15 minutes allowing for the electrolytic capacitors to discharge fully. Disconnect power cord

from the outlet!

Any work inside the PA (internal fuses replacement, tube replacement, etc.) should be carried out only

by a professionally qualified person!

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.

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 the 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!

GENERAL DESCRIPTION

3.1. HF Compartment

his amplifier is using ceramic tetrode FU-728F in a grounded-cathode circuit (input into control grid).

The OM2000+ amplifier achieves excellent linearity by the voltage stabilization of the control grid

bias and the screen voltage. The power input is fed to the control grid, using a broadband input

circuit with an input impedance of 50 Ohms. This adaptable input circuit ensures a good input SWR (better

than 1.5 : 1) on all amateur bands.

The output of the amplifier is a Pi-L circuit. The variable capacitors for TUNE and LOAD are separate. 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 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). The high voltage is made by combining 4 x 575V AC (total 3200V DC @

1,2A. Each has its own rectifier and filter. In the high voltage circuit, safety resistors and fuse are employed

to protect the amplifier against overload (placed on the power supply board).

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. The factory setting is

230 V AC (230, 240, 250V AC, 60 Hz for USA models, factory setting is 240 V AC)

If the AC voltage in your network is 220 or 240 Volts, you need to set the correct transformer tap before

first starting 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 elements is a

mechanical switch for AC blocking an opened

amplifier.

INSTALLATION

Read this chapter carefully prior to starting installation. Before unpacking inspect shipping

carton for any damage. Keep all of packing parts for possible future shipment. Check unpacked

power amplifier. If you find any damage, contact your dealer immediately to keep full

warranty.

4.1. Grounding

The amplifier must 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.

Type of supported TCVR and working

frequency are visible on the display.

AUTO LED is ON.

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.

4.2. Coaxial Cable

The output of the transceiver is to be connected to the input of the amplifier via RG58 or similar 50 Ohm

cable. For the connection between the power amplifier and the antenna, RG213 or similar coaxial cable

suited for high power is recommended. SO-239 sockets with Teflon insulation are used for the HF INPUT

and OUTPUT connectors.

Rear view of the amplifier OM2000+

Fuses Mains Plugs HF Output

Blower 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 is RCA socket 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

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