OM POWER OM1002 Manuale utente

Instruction Manual

OM1002

Solid State 145 MHz 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 ………………………………………………. 6

3.1. HF part ……………………………………………………………………. 6

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

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

4. INSTALLATION ………………………………………………………… 9

4.1. Grounding ………………………………………………………………… 9

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

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

4.4. Main Supply ………………………………………………………………. 11

4.5. Cooling ……………………………………………………………………. 11

5. OPERATION ……………………………………………………………… 11

5.1. Operation Elements ……………………………………………………….. 12

5.2. Preparation for operation …...……………………………………………… 13

5.2.1. Display Menu ……………………………………………………………… 14

5.2.2. Settings Menu ……………………………………………………………… 15

5.2.2.1. Own text editing ………………………………………………………….. 16

5.2.2.2. Display delay ……………………………………………………………... 16

5.2.2.3. Bias delay ………………………………………………………………… 17

5.2.2.4. Preamplifier delay ………………………………………………………… 17

5.2.2.5. Bias SSB No.1 ………………………………………………………….. 18

5.2.2.6. Bias CW No.1 ………………………………………………………….. 18

5.2.2.7. Software version ……………………………………………………….. 19

5.2.3. Operating mode ………………………………………………………… 19

6. MAINTENANCE ………………………………………………………. 23

6.1. Indication of Fault Conditions …………………………………………. 23

6.2. Fuse Replacement . .………………………………………………….... 24

6.3. Cleaning ……………………………………………………………....... 25

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

7.1. Block Diagram ………………………………..………................................ 26

1. GENERAL INFORMATION

1.1. Introduction

The OM Power model OM1002 is a single band, solid state amplifier, designed for duty

operation on 2 meter’s amateur band with all modes and no time limit. It is equipped with

a new Freescale high rugged N-channel double MOSFET. This amplifier is characterized by

compact design, small size and a low weight.

1.2. Specification

1.2.1. Parameters

Frequency Coverage 144 – 148 MHz Amateur Band

Power Output 1000W in CW, 800W SSB (linearity), RTTY,

AM, FM and digi, 50% duty cycle.

Input Power 10 to 15 W for full output power 1000W

Input Impedance 50 Ohm, VSWR < 1.3 : 1

Power Gain Typically 19 dB

Output impedance 50 Ohm unbalanced

Maximum output SWR 1,9 : 1 for full output power 1000W

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

100W or higher

Intermodulation distortion - 32 dBc

Suppression of harmonics < -60 dBc

MOSFET MRFE6VP61K25HR6

Cooler 3 axial fans + 2 axial fans (power supply)

Supplying 100 – 250VAC , 50 – 60 Hz

Power Supplies inside 50V DC switch mode PS

12V DC for logic and protection circuits

Size 270 mm x 200 mm x 345 mm [10.6” x 7.9” x 13.6”]

(Width x height x depth)

Weight 12 kg ( 26.5 lb )

1.2.2. Protection Circuits

There is several 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.

·Output power too high

·Reflected power too high

·Drain current too high

·Gain to low

·DC voltage too low or DC voltage error

·Input power too high (hardware protection & software protection)

·Inside temperature too high

·Soft start for power supply protection (PS feature)

1.2.3. Indicators

There are few visible LED indicators on the front panel for information on operating

condition, a few buttons and a graphic display.

LED Indicators STBY - Standby mode

OPERATE - Operation mode

CW - CW mode

PREAMP - Control voltage +12V DC for optional RX

preamplifier switching

FAULT - Failure

ON AIR - Transmit mode

Buttons UP – DWN - Listing in LCD menu

- Scroll trough the alphabet in edit mode

- Changing parameters

OPER - Operation mode

SET - confirms parameters

- Cursor to the right in edit mode

- Settings menu

PRE - Preamplifier ON

- Edit mode start, cursor to the left in edit mode

CW/SSB - mode switch

OSD Indicator 140 x 16 dot graphic display to view:

- Display menu

- Settings menu

- Warning & fault messages

2. SAFETY INSTRUCTIONS

WARNING! Before you will start to install and operate power amplifier, read carefully

next safety instructions!

WARNING! AVOID CHILDREN to play around PA or to touch power amplifier or

connected cables in working condition, or to push anything into the fan holes!

WARNING! Never turn the amplifier on without the upper lid in place.

WARNING! The OM1002 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. Take out power cord from the outlet!

CAUTION! The amplifier must be installed in such a way that free flow of hot air from

inside 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 panel will stay 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! Read this manual carefully. Follow 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

OM1002 power amplifier was designed to achieve the RF performance of the MOSFET,

when applied to the 144 – 148 MHz frequency band. Design was tuned for performance at

1000W CW output, 50VDC. It consists of „no tune“ distributed element matching circuits

designed to be as small as possible.

For operating it is important that adequate heat sinking was provided for the design.

Look at the RF board

The coaxial transformer turns ratio was chosen to meet required impedance level and the

length of the coax was tuned to achieve maximum efficiency and maximum power transfer

between the device and its load impedance.

Top view on the opened OM1002

Input / Output Relay HF Board Output LPF

Supply Board for Control circuits Switch Mode Power Supply

3.2. Power Supply

The amplifier uses two power supplies. A professional switch mode power supply 50V / 32A

for power amplifier, and small 12V power supply for logic and protection circuits.

Main power supply contains special soft start circuits, uses two fans, which are visible from

the rear side of PA. It has its own logic to control these fans speed.

Power amplifier should be connected to any external source of AC in the range from 100VAC

to 250VAC, 50 or 60 Hz. It can be powered by a portable generator, for example.

Switch Mode Power Supply and the

Supply Board. Two fuses are visible.

3.3. Safety Devices

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

These are on the Control board and the Protection board. Control board is located behind the

front panel. Protection board is visible on the right hand side of PA, close to the input/output

relay.

Protection Board at the top

Input/Output Relay in the middle

Communication Board at the bottom

(LAN)

4. INSTALLATION

NOTE

Read this chapter carefully prior starting with installation. Before unpacking inspect shipping

carton 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 of cables and make sure that the connections are both physically and

electrically sound. With poor grounding, you may risk damaging to 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, Belden 9913

or similar coaxial cable suited for high power is recommended. Both the INPUT and

OUTPUT N sockets with Teflon insulation are used.

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.

Amplifier uses one double coaxial relay for input and output (input and output are switched at

the same time). It has to be switched earlier than HF is applied (cold switching).

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

Rear view of the amplifier OM1002

RF Output RF Input AC Power Socket

PS Fans

LAN - Local Area Network connection for REMOTE CONTROL of PA (for future use)

PREAMP -RCA Phono, +12V / 100mA for an external RX preamplifier switching

CAUTION

If you are using an 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 50V / 100mA)

Indice

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