OM POWER OM2000+ Manuale utente

MADE IN SLOVAKIA

OM2000+

SHORTWAVE PLUS 50 MHz

POWER AMPLIFIER

WWW.OM-POWER.COM

OM POWER, s.r.o. 93030 Báč 126,

SLOVAKIA

Contact : +421 905 321 410

e-mail : om[email protected]

TABLE OF CONTENTS

1. GENERAL INFORMATION ..................................................................... 3

2.1. Introduction …………………………………………………………………. 3

2.2. Specification …………………………………………………………………. 3

2.2.1. Parameters …………………………………………………………………. 3

2.2.2. Protection Circuits …………………………………………………………………. 3

2.2.3. Indicators …………………………………………………………………. 4

2.2.4. Features …………………………………………………………………. 4

2. SAFETY INSTRUCTIONS …………………………………………………………………. 5

3. GENERAL DESCRIPTION …………………………………………………………………. 6

3.1. HF part …………………………………………………………………. 6

3.2. Power Supply …………………………………………………………………. 7

3.3. Safety Devices …………………………………………………………………. 8

4. INSTALLATION …………………………………………………………………. 8

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

4.2. Coaxial Cable …………………………………………………………………. 9

4.3. Control Cable …………………………………………………………………. 9

4.4. Main Supply …………………………………………………………………. 10

4.5. Cooling …………………………………………………………………. 10

5. OPERATION …………………………………………………………………. 11

5.1. Operation Elements …………………………………………………………………. 11

5.2. Preparation for operation ………………………………………………………………. 13

5.2.1. Display menu …………………………………………………………………. 14

5.2.2. Settings menu …………………………………………………………………. 16

5.2.3. Service menu …………………………………………………………………. 19

5.3. Operation mode …………………………………………………………………. 22

5.4. Tuning of the Power Amplifier ……………………………………………………… 23

6. MAINTENANCE …………………………………………………………………. 27

6.1. Indication of Fault Conditions ……………………………………………………… 27

6.2. Fuse Replacement …………………………………………………………………. 31

6.3. Tube Replacement …………………………………………………………………. 31

6.4. Cleaning …………………………………………………………………. 31

7. APPENDIX …………………………………………………………………. 32

7.1. Primary AC selection …………………………………………………………………. 32

7.2. Removing the HV Transformer ……………………………………………………. 33

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

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

(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

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 2 : 1

SWR protection Automatic switching to STBY, when reflected power

is 250W or higher

Intermodulation distortion 32dB below nominal output

Suppression of harmonics < -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.

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. 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

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 2000 W PA on the market

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 electrolytic 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!

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

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

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 circuitry 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 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

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 stabilized first grid voltage

is controlled by the software (EBS for example).

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.

Type of supported TCVR and working

frequency are visible on the display.

AUTO LED is ON.

Type of supported TCVR and working

frequency are visible on the display.

AUTO LED is ON.

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 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. All the INPUT and three OUTPUT (ANT1, ANT2, ANT3)

SO-239 sockets with Teflon insulation are used.

Rier 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.

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