OM POWER OM2501A Manuale utente

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

OM2501A

( OM3501A)

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 OM2501A …………………………………… 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. OM2501A Front Panel ……………………………………………. 12

5.2. OM2501A 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 OM2501A with FLEX Radio Series 6xxx ……………. 34

7.3. OM2501A Remote Control ………………………………..………. 36

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

7.4.1. Changing OM2501A+ 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. OM2501A firmware upgrade …………………………..………… 43

7.6. Icom connection with OM2501A ……………………………….… 47

7.7. Yaesu plus BPF plus ANT Switch connection with OM2501A … 48

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

7.9. Block Diagram of the OM2501A Power Amplifier …………..… 53

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

GENERAL INFORMATION

1.1. Introduction

he OM Power model OM2501A and OM3501A are designed for all short wave amateur bands

from 1.8 to 29.7 MHz (including WARC bands) and all modes. OM2501A is equipped with a FU-

728F or GU84B ceramic tetrode and OM3501A is with GU78b ceramic tetrode.

1.2. Specification

1.2.1. Parameters

Frequency Coverage Amateur Bands 1.8 – 29.7 MHz including WARC

Power Output OM2501A 2500+ W in SSB/CW on HF bands

2000 W in RTTY and DIGI modes

Power Output OM3501A 3500+ 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 FU-728F or GU84B in OM2501A

GU78b in OM3501A

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 2 kVA ( 3 kVA for OM3501A)

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

Weight 42 kg ( OM3501A 45kg )

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

1.2.4. The Advantages of OM2501A

•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/downloads

2. SAFETY INSTRUCTIONS

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 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 OM2501A 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 ceramic tetrode in a grounded-cathode circuit (input into control grids).

The OM2501A (OM3501A) 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 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 OM2501A

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 2 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 410 V (total

3280V) @ 2,0 A . 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 120mA. 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 OM2501A

Mains PlugsFuses HF Output

Grounding point Blower Control HF Input

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