OM POWER OM2500 A Manuale utente

Instruction Manual

OM2500 A

SHORTWAVE POWER AMPLIFIER

OM POWER, s. r. o. 930 30 Báč126

SLOVAKIA

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

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 ………………………………………………. 7

3.1. HF part ……………………………………………………………………. 7

3.2. Power Supply …………………………………………………………….. 8

3.3. Safety Devices ……………………………………………………………. 8

4. INSTALLATION ………………………………………………………… 8

4.1. Grounding ………………………………………………………………… 8

4.2. Coaxial Cable …………………………………………………………....... 9

4.3. I/O Box and Interface ……………………………………………………... 9

4.4. Mains Supply ……………………………………………………………… 12

4.5. Cooling ……………………………………………………………………. 12

4.6. Remote Control …………………………………………………………… 12

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

5.1. Operation Elements ……………………………………………………….. 13

5.2. Configuration of Power Amplifier ………………………………………... 15

5.2.1. TCVR Support Settings …………………………………………………… 15

5.2.2. Connection with no supported TCVRs ……………………………………. 16

5.2.3. Communication Loss ……………………………………………………… 17

5.2.4. Antenna Switching Menu …………………………………………………. 17

5.2.5. Bandpass Filter Settings …………………………………………………… 18

5.2.6. Loading Factory Default Settings …………………………………………. 18

5.2.7. MUTE Option ……………………………………………………………… 19

5.2.8. LCD Settings Menu ……………………………………………………… 20

5.2.9. Operation in MANUAL Mode ………………………………………….. 20

5.3. Tuning of Power Amplifier …………………………………………….. 20

5.3.1. AUTO or MANUAL …………………………………………………… 21

5.3.2. Manual Tuning Instructions …………………………………………….. 21

5.3.3. Tuning Adjustment ………………………………………………………. 23

6. MAINTENANCE ………………………………………………………. 24

6.1. Indication of Fault Conditions …………………………………………. 24

6.2. Fuse Replacement …………………………………………………….... 25

6.3. Tube Replacement …………………………………………………....... 25

6.4. Cleaning ……………………………………………………………….. 25

7. APPENDIX …………………………………………………………….. 26

7.1. Example of connection for ICOM ……………………………………… 26

7.2. Example of connection for ELECRAFT ………………………………… 27

7.3. Example of connection with YAESU …..……………………………… 28

7.4. Example of connection with Antenna switch and BPF …………………. 29

7.5. Example of connection USB micro KEYER II

with IC7800 or IC7700 ……………………………………………....... 30

7.6. Example of connection USB micro KEYER II

with another Icom ……………………………………………………….. 31

7.7. Example for connection USB micro KEYER II

with Yeasu or ELECRAFT ……………………………………………. 32

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

with CI-V output ....................................................................................... 33

7.9. Block Diagram of OM2500A Power Amplifier (USA version)................. 34

1. GENERAL INFORMATION

1.1. Introduction

The OM Power model OM2500A 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 one GU84b ceramic tetrode.

THE ADVANTAGES OF OM2500A

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

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 2500 W in SSB and CW, 2000 W in RTTY, AM

and FM

Input Power Usually 60 to 80W for full output power

Input Impedance 50 Ohm, VSWR < 1.2 : 1

Power Gain 17 dB

Output impedance 50 Ohm unbalanced

Maximum output SWR 2:1

SWR protection: Automatic switching to STBY , when reflected power is

350Wor higher

Intermodulation distortion 32 dB below nominal output

Suppression of harmonics < -50 dBc

Tuning Manual or AUTO

Response speed of AUTO Less than 0.5 sec within the same band

Less than 3 sec. if out of the band

Tube GU84b Ceramic tetrode

Cooler Centrifugal blower + axial blower

Power supply 2 x 230 V - 50 Hz one or two phases

Transformers 2 pcs of toroidal transformer 2,0 kVA

Parameters 485 mm x 200 mm x 455 mm

(width x height x depth)

Weight 40 kg

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 (150 sec)

STBY – standby

OPR – operation condition

FAULT – failure, switching off for abt. 4 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

2. SAFETY INSTRUCTIONS

WARNING!

DANGEROUS HIGH VOLTAGE!

The power amplifier is using high voltage up to 2800V 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! OM2500 HF amplifier can be operated ONLY if both of supply cables are

connected! The amplifier reaches optimal parameters in 2 phase’s system, if you do not

have 2 phases, connect both mains cords into the same phase.

WARNING! The OM2500A 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!

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

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 1.2:1) 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 OM2500A

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 BU941 NPN Darlington

transistors and delivers a voltage of 350V 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

mm2at 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 OM2500A

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 OM2500A 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)

CI-V Mono 3.5mm Jack for connection of ICOM TCVRs or devices that

provide compatible CI-V protocol. Correct baud rate is important.

TCVR DB9 serial port RS232 for KENWOOD, YAESU and ELECRAFT

TCVRs. Correct baud rate and type is required for successful

operation. If both CI-V and TCVR cables are connected then CI-V

disables RS232. Otherwise selection of interface is done via TCVR

type.

PC DB-9 RS232 port is used for communication with your PC. Please use

setting you would normally use if using direct TCVR – PC connection.

ALC RCA Phono – Automatic Level Control is used when tuning the PA to

block drive level.

CAUTION!

We only recommend using ALC feature while operating RTTY, FM and other 100%

duty modes.

CONTROL The CONTROL socket is a single DB-15 connector that provides many

connections to the amplifier from your transceiver. Use shielded cable

for all connections to this connector. You will need to fabricate a cable

with the proper connector for your transceiver or use individual

connectors as described below.

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