OM POWER OM4001A Manuel utilisateur

MADE IN SLOVAKIA

WWW.OM-POWER.COM

OM Power, s.r.o. 93030 Báč126,

SLOVAKI A

Co n t a ct : + 4 2 1 905 321 410

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

e-mail : om-power@om-

power.com

OM4001A

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

1.2.4. The Advantages of OM4001A …………………………………… 5

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

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

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

3.2. Power Supply …………………………………………………………. 9

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. OM4001A Front Panel ……………………………………………. 12

5.2. OM4001A Control ………………………………………………… 13

5.3. Preparing for operation ………………………………………… 20

5.4. Operation mode ……………………………………………………. 26

6. MAINTENANCE ……………………………………………. 30

6.1. Indication of Fault Conditions ………………………………… 30

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

6.3. Tube Replacement ……………………………………………. 32

6.4. Cleaning ………………………………………………. 32

7. APPENDIX ………………………………………………………. 32

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

7.2. Controlling OM4001A with FLEX Radio Series 6xxx ……………. 34

7.3. OM4001A Remote Control ………………………………..………. 36

7.4. Remote Control using own public IP Address ............................. 40

7.4.1. Changing OM4001A+ connection settings ................................. 40

7.4.2. Setting up in the Remote software ............................................... 41

7.4.3. Remote Control without own IP Address, behind a router .......... 42

7.5. OM4001A firmware upgrade …………………………..………… 43

7.6. Icom connection with OM4001A ……………………………….… 47

7.7. Yaesu plus BPF plus ANT Switch connection with OM4001A … 48

7.8. Control panel connectors pin-out …………………………….…… 49

7.9. Block Diagram of the OM4001A Power Amplifier …………..… 53

7.10. Troubleshooting ………………………………………………………. 54

GENERAL INFORMATION

1.1. Introduction

he OM Power model OM4001A 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 with silent relay

•Many operational parameters to display

•Easy transport due to detachable HV transformer

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

1.2.4. The Advantages of OM40001A

•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 Band and Frequency switching, for use with radios which do not

have CAT. We recommend using CAT and BAND DATA information

due to the much faster band changing whenever possible.

•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 via available PC Application. http://www.om-power.com/download/HF

PA_Manager_

2. 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 OM4001A 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 aprofessionally 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!

3. 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 OM4001A 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 OM4001A

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.

4. 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 OM4001A

Mains PlugsFuses HF Output

Grounding point Blower Control HF Input

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