OM POWER OM2500 HF Bedienungsanleitung

Instruction Manual

OM2500 HF

SHORTWAVE POWER AMPLIFIER

OM POWER, s. r. o. 930 30 Báč 126

SLOVAKIA

E-mail: om[email protected]

TABLE OF CONTENTS

1. GENERAL INFORMATION

1.1. Introduction ……………………………………………………………….. 4

1.2. Specification …………………………………………………………….... 4

1.2.1. Parameters …………………………………………………………………. 4

1.2.2. Protection Circuits ………………………………………………………… 4

1.2.3. Indicators ………………………………………………………………….. 5

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 ………………………………………………………………… 8

4.2. Coaxial Cable …………………………………………………………....... 8

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

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

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

5. OPERATION ……………………………………………………………… 10

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

5.2. Tuning of Power Amplifier …………………………………………….. 12

6. MAINTENANCE ………………………………………………………. 14

6.1. Indication of Fault Conditions …………………………………………. 14

6.2. Fuse Replacement . .………………………………………………….... 15

6.3. Tube Replacement …………………………………………………....... 16

6.4. Cleaning ……………………………………………………………...... 16

7. APPENDIX ……………………………………………………………... 16

7.1. Band Blocking …………………………………………………………… 16

7.2. Block Diagram of OM2500 HF Power Amplifier (USA version) ………... 17

1. GENERAL INFORMATION

1.1. Introduction

The OM Power model OM2500HF is a manual tuning, full legal limit amplifier, designed for

heavy duty use on all short wave amateur bands from 1.8 to 29.7 MHz (including WARC

bands) and all modes with no time limit. It is equipped with one GU84b ceramic tetrode.

1.2. Specification

1.2.1. Parameters

Frequency Coverage Amateur Bands 1.8 –29.7 MHz including WARC

Power Output 1500w PEP continuous output all modes - *no time

limit*

Input Power 40 to 60W for full output power

Input Impedance 50 Ohm, VSWR < 1.5 : 1

Power Gain typically 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 36 dB below nominal output

Suppression of harmonics < -52 dBc second, < -65 dBc third

Tube GU84b Ceramic tetrode

Cooler Centrifugal blower + axial blower

Power supply 240 V - 60 Hz

Transformers 2 pcs of toroidal transformer 2,0 kVA

Parameters 485 mm x 200 mm x 455 mm [19.1” x 7.9” x 17.9”]

(width x height x depth)

Weight 38 kg ( 84 lb )

1.2.2. Protection Circuits

There are 8 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

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 LED

Reflected power –20 LED

Current at screen Ig2 –10 LED

Anode voltage, anode current, tuning –30 LED

LED Indicators Current at control grid (Ig1 –2 LED)

WAIT –preheating of tube (180 sec)

STBY –standby

OPR –operation condition

FAULT –failure, switching off for abt. 4 sec

2. SAFETY INSTRUCTIONS

WARNING!

DANGEROUS HIGH VOLTAGE!

The power amplifier is using high voltage up to close 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! 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 OM2500 HF 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!

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.)

CAUTION! The amplifier must be properly grounded during operation.

CAUTION! During operation the amplifier must be installed in such a way that the rear

power supplies are 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

In this amplifier a tetrode GU 84b is used in a grounded-cathode circuit (input into control

grid). This 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 grid, 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 OM2500 HF

Tetrode GU84B PWR meter Blower Switch-on board

Output Pi-L Circuit Tuning capacitor Power supply board

Subpanel

3.2. Power Supply

Power supply of the amplifier is comprised of two of 2,0 kVA toroidal transformers. A soft

start is provided using relays and resistors.

The high anode voltage is made by combining 8 x 350 V (total 2800V) @ 2A. 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 BU508 transistors and

delivers a voltage of 360V at 100mA.

The -120V for the control grid is regulated with zener diodes.

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.

Rear view of the amplifier OM2500 HF

MAINS CABLE FUSES OUTPUT

CONTROL 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 OM2500 HF 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).

KEY IN RCA Phono - Input signal PTT switching voltage / current 5V /2 mA)

KEY OUT RCA Phono - Output signal PTT (maximum switching of 30V / 50mA)

4.4. Main Supply

WARNING!

Power Amplifiers OM2500 HF are manufactured for several different power systems.

For US territory only one mains cable is used for two phases (2x120V) system. Cord is

not removable from PA. Amplifier is equipped with two mains fuses (see rear panel).

CAUTION

Be sure you got PA with properly terminated line cable, corresponding with your power

system’s outlet. If not, contact your dealer. In such a case you should make the necessary

changes using a licensed electrician.

WARNING!

Be sure that your power system is correctly wired and properly rated! To use

adequately sized and connected grounding system is also very important.

4.5. Cooling

CAUTION

The amplifier must be installed in such a way that free flow of hot air from the tube is

allowed. Do not obstruct air intake and exhaust areas of the PA.

The centrifugal blowers provide the necessary cooling of the amplifier, even during long

contests. The main blower is activated by switching the PA on and it is turned off when

cooling is finished (approx. 1-5 min after switching off the PA depending on the temperature

of the tube). The supplemental fan is turned on depending on the temperature of the air exiting

from the amplifier. It is switched on at 70°C and switched off at 60°C.

5. OPERATION

WARNING!

Before switching PA on, make sure that amplifier is grounded, antenna or dummy load

is connected, and line cord is putted to the outlet. Do not allow children or unauthorized

person to go close to PA, to touch cables or connectors, to push anything into the case

holes!

CAUTION

Before switching PA on, check all connections between PA and TCVR.

CAUTION

Do not turn PA on for at least 2 hours after unpacking it and locating in its operating

location. Especially when amplifier is moved from a cold place to a warm one because

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