OM POWER OM4001HF 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-po[email protected]

OM4001HF

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 ………… ……………….………………………………. 10

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

4.3. Control Cable ………………..………………………………………………. 11

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

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

5.1. OM4001HF Front Panel ……………….……………………………………………. 12

5.2. OM400HF Control ……………………………………………………………… 13

5.3. Preparing for operation ……………………………………………………………… 14

5.4. Operation mode …………….………………………………………………. 20

6. MAINTENANCE ...................……………………………………………. 22

6.1. Indication of Fault Conditions …………………………..………………………………… 22

6.2. Fuse Replacement ………………..……………………………………………. 24

6.3. Tube Replacement ………………..……………………………………………. 24

6.4. Cleaning ……………..………………………………………………. 24

7. APPENDIX ………………………………………………………………. 25

7.1. Primary AC selection ……………….……………………………………………. 25

7.2. OM4001HF firmware upgrade ……………………..…………………………..………… 26

7.3. Control panel connectors pin-out ………………..…………………………….…… 29

7.4. Block Diagram of the OM4001HF Power Amplifier ………….…………..… 30

7.5. Troubleshooting ………………………………………………………………. 31

7.6. Factory reset ….………………………………………………………….. 33

GENERAL INFORMATION

1.1. Introduction

he OM Power model OM4001HF is designed for all short wave amateur bands from 1.8 to 29.7 MHz

(including WARC bands) and all modes. It is equipped with a two ceramic tetrodes FU-728F.

1.2. Specification

1.2.1. Parameters

Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC

Power Output 4000+ W in SSB/CW on HF bands

3000 W in RTTY and DIGI modes

Input Power Usually 40 to 60W for full Output Power

Input Impedance 50 Ohm, VSWR < 1.5 : 1

Power Gain 17 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

Tubes 2 x FU-728F Ceramic tetrode

Cooler Centrifugal blower + Axial blower

Power supply switchable 2 x 220 ,230V, 240 V – 50 Hz one or two phases

Transformers 2 pcs of toroidal transformer 3kVA

Dimensions 485 x 200 x 455mm (width x height x depth)

Weight 46 kg

1.2.2. Protection Circuits

There are several protection circuits used in the amplifier. They are activated when one or more

parameters exceed 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 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

• Many operational parameters to display

• Easy transport due to detachable HV transformer

• The smallest and lightest 4000 W Power Amplifier on the market

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 OM4001HF 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 lid of the amplifier make sure that power supply has been disconnected

AT LEAST 10 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 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!

GENERAL DESCRIPTION

3.1. HF Compartment

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

control grids). The OM4001HF 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 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 variable capacitors for TUNE and LOAD are seperate. 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 OM4001HF

Tetrode FU728F Blower Switch-ON Board

Output Pi-L Circuit Tuning Capacitor Front Subpanel Power Supply Board

3.2. Power Supply

This Power amplifier uses two 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 8 x 420 V (total

3360V) @ 2.5A . 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 separate screen grid supply is regulated and stabilized with MOSFET circuits and delivers abt. 350V

DC at 200mA. 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 or 240V AC.

The factory setting is 230 VAC .

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.

Type of supported TCVR and working

frequency are visible on the display.

AUTO LED is ON.

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, 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.

Rier view of the amplifier OM4001HF

Mains Plugs Fuses HF Output

Grounding point Blower Control HF Input

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