OM POWER X8NOM4000A Manuale utente

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Instruction Manual

OM4000A

SHORTWAVE POWER AMPLIFIER

FCC ID: X8NOM4000A

WWW.OM-POWER.COM

OM POWER, s.r.o. 93030 Báč126, SLOVAKIA

Contact : +421 905 321 410

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

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TABLE OF CONTENTS

1. GENERAL INFORMATION 4

1.1. Introduction 4

1.2. Specification 4

1.3. Parameters 4

1.4. Protection Circuits 5

1.5. Indicators 5

2. SAFETY INSTRUCTIONS 6

3. GENERAL DESCRIPTION 7

3.1. HF Part 7

3.2. Power Supply 8

3.3. Safety Devices 9

4. INSTALLATION 9

4.1. Grounding 9

4.2. Coaxial Cable 9

4.3. I/O Box and Interface 10

4.4. Mains Supply 13

4.5. Cooling 13

4.6. Remote Control 13

5. OPERATION 13

5.1. Operation Elements 14

5.2. Configuration of Power Amplifier 16

5.2.1. TCVR Support Settings 17

5.2.2. Connection with not supported TCVRs 18

5.2.3. Communication Loss 19

5.2.4. Antenna Switching Menu 19

5.2.5. Bandpass Filter Settings 20

5.2.6. Loading Factory Default Settings 20

5.2.7. Mute Option 21

5.2.8. LCD Settings Menu 22

5.2.9. Operation in Manual Mode 22

5.3. Tuning of Power Amplifier 22

6. MAINTENANCE 26

6.1. Indication of Fault Conditions 26

6.2. Fuse Replacement 27

6.3. Tube Replacement 27

6.4. Cleaning 27

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7. APPENDIX 28

7.1. Example of connection with ICOM 28

7.2. Example of connection with ELECRAFT 29

7.3. Example of connection with YEASU 30

7.4. Example of connection with Antenna Switch and BPF 31

7.5. of connection USB Micro KEYER II

with IC7800 or IC7700 32

7.6. Example of connection USB Micro KEYER II

with another ICOM 33

7.7. Example of connection USB Micro KEYER II

with YAESU or ELECRAFT 34

7.8. Example of connection PA with MicroHAM MKII, (MK2R+ etc.)

CI-V output 35

7.9. Controlling the OM Power automatic amplifiers with Flex 36

Radios Series 6xxx

7.10. Block diagram of the OM4000A 38

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1. GENERAL INFORMATION

1.1. Introduction

he OM Power model OM4000A is a fully automatic power amplifier, designed for use on

all short wave amateur bands from 1.8 to 29.7 MHz (including WARC bands) and all

modes. It is equipped with a two pieces of ceramic tetrode FU728F.

THE ADVANTAGES OF OM4000A

Full compatibility with: ICOM, ELECRAFT, KENWOOD, TEN-TEC ORION, YAESU, FLEX RADIO

SERIES 6XXX and Icom transceive protocol using by MicroHAM devices ( CI-V output ).

Automatic switching between bands

Automatic tuning within the band according to segments

Automatic switching of band pass filter

Automatic switching of antenna switches

The possibility to use 2 different antennas within one band or segment

1.2. Specification

1.2.1. Parameters

Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC

Power Output 1500W continuous output – no time limit

Input Power Usually 50 to 70W for full Output Power

Input power can not exceed 100W !

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 350W or higher

Intermodulation distortion 32dB below nominal output

Suppression of harmonics < -50 dBc

Tubes 2x FU728F Ceramic tetrode

Cooler Centrifugal blower + Axial blower

Power supply 240V – 60 Hz

Transformers 2 pcs of toroidal transformer 3kVA

Dimensions 485x200x455mm (width x height x depth) (19”x8”x18”)

Weight 46 kg (101.5 lbs)

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1.2.2. Protection Circuits

There are 11 special 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

•Input power too high

•Output power too high

•Plate voltage too low

•Anode current too high

•Screen current too high

•Grid current too high

•Mistuning of PA

•Hot switching protection

•Soft start for protecting your fuses

•“switch-on blocking “ at opened amplifier

1.2.3. Indicators

There are couples of LED and bar graph indicators visible on the front panel to inform you

about value of some parameters or operation status:

Bar graph indicators Power output -50 LEDs

Reflected power - 20 LEDs

Ig2 current -10 LEDs

Anode voltage, anode current, tuning -30 LEDs

LED Indicators Current at control grid (Ig1) -2 LEDs

WAIT - preheating of tube (150 sec.)

STBY - standby

OPR - operation mode

FAULT -failure, switching off for abt. 2 sec.

INHIBIT - operating condition

ANT 1 - which ANT is in use

ANT 2 - which ANT is in use

ANT - ANT selection

Buttons UP – DWN - listing in menu

MAN - manual operating

AUTO - automatic operating

TUNE - tuning

SET – confirms selected parameter

OSD Indicator LCD Display 2 x 16 characters

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2. SAFETY INSTRUCTIONS

WARNING!

DANGEROUS HIGH VOLTAGE INSIDE!

The power amplifier is using high voltage up to 3400V 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!

The amplifier contains high voltage circuits. 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 OM4000A amplifier can be operated ONLY if both of supply cables are connected!

WARNING!

The OM4000A 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 5 minutes allowing the electrolytic capacitors to discharge fully.

Disconnect power cord from the outlet!

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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 the top cover of the PA in these places during operation.

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

Make sure that all screws holding the case together are properly in place and tightened

before carrying the amplifier with the handles!

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 two pieces of ceramic tetrode FU728F in a grounded-cathode circuit (input

into control grids). OM4000A 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 1.2:1) 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 OM4000A

Tetrode FU728F PWR Meter Blower Switch-ON Board

Output Pi-L Circuit Tuning Capacitor Subpanel Power Supply Board

3.2. Power Supply

ower supply of the amplifier is comprised of two of 3 kVA toroidal transformers. A soft

start is provided using relays and resistors.

The high anode 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.

The source for screen grid is regulated by parallel stabilization with BU941 NPN Darlington

transistors and delivers a voltage of 350V at 200mA. The -120V for the control grid is regulated

with Zener diodes.

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3.3. Safety Devices

Control and monitoring circuits ensure control and safety during malfunctions of the PA. These

are on the Control board, which is located on the chassis subpanel.

4. INSTALLATION

NOTE

Read this chapter carefully prior you will start installation. Before unpacking inspect shipping

woody container 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 next parts.

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. Both the INPUT and OUTPUT SO-

239 sockets with Teflon insulation is used.

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Rear view of the amplifier OM4000A

AC Sockets Fuses OUTPUT

REMOTE I / O Interface INPUT

4.3. I/O Box and Interface

Control of Amplifier and communication with TCVR as well as Antennas / BPF switching can be

done via the rear panel I/O Interface.

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 OM4000A have to be switched earlier than HF is applied (cold switching).

Modern transceivers they have a time delay between PTT switching and power output.

CAUTION

If you are using and older transceiver or transmitters without time delay, we recommend

to connect the PA in such a way that the transmit/receive switch (foot switch for example)

is connected with the KEY IN socket of the amplifier. The KEY OUT socket is to be

connected with the PTT socket at the transceiver.

The amplifier is equipped with two safety devices, which ensure that the output relay is not

switched under power mistakenly (hot switching).

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