Tait T889 Bedienungsanleitung

M889-00 1

T889 Power Amplifier

UHF FM 800-870MHz

Issue 100 October 1995

M889-00-100

2M889-00

02/10/95 Copyright TEL

Head Office

New Zealand

Tait Electronics Ltd

558 Wairakei Road

P.O. Box 1645

Christchurch

New Zealand

Phone: 64 3 358-3399

Fax: 64 3 358-3636

Australia

Tait Electronics (Aust) Pty Ltd

275 Toombul Road

Northgate 4013

P.O. Box 679

Virginia

Queensland 4014

Australia

Phone: 61 7 3260-7799

Toll Free: 1800 077-112

Fax: 61 7 3260-7990

Canada

Tait Mobile Radio Inc.

Unit 5, 158 Anderson Avenue

Markham

Ontario L6E1A9

Canada

Phone: 1 905 472-1100

Toll Free: 1 800 890-8248

Fax: 1 905 472-5300

France

Tait France Sarl

2 Avenue de la Cristallerie

92 316 Sèvres, Cedex

France

Phone: 33 1 41 14-05-50

Fax: 33 1 41 14-05-55

Germany

Tait Mobilfunk GmbH

Willstätterstraße 50

D-90449 Nürnberg 60

Germany

Phone: 49 911 96 746-0

Fax: 49 911 96 746-79

New Zealand

Tait Communications Ltd

Unit 4, 75 Blenheim Road

P.O. Box 1185

Christchurch

Phone: 64 3 348-3301

Fax: 64 3 343-0558

Singapore

Tait Electronics (Far East) Pte Ltd

4 Leng Kee Road

SIS Building #05-11A

Singapore 159088

Phone: 65 471-2688

Fax: 65 479-7778

United Kingdom

Tait Mobile Radio Ltd

Ermine Business Park

Ermine Road

Huntingdon

Cambridgeshire PE18 6YA

United Kingdom

Phone: 44 1480-52255

Fax: 44 1480-411996

USA

Tait Electronics (USA) Inc.

9434 Old Katy Road

Suite 110

Houston

Texas 77055

USA

Phone: 1 713 984-8684

Toll Free: 1 800 222-1255

Fax: 1 713 468-6944

M889-00 3

About This Manual

Scope This manual contains general, technical and servicing informa-

tion on the T889 Power Amplifier.

Revision Control Each page in this manual has a date of issue. This is to comply

with various Quality Standards, but will also serve to identify

which pages have been updated and when. Each page and its

publication date is listed in the “List of Effective Pages”.

Any portion of text that has been changed is marked by a verti-

cal line (as shown at left) in the outer margin of the page. Where

the removal of an entire paragraph means there is no text left to

mark, an arrow (as shown at left) will appear in the outer mar-

gin. The number beside the arrow will indicate how many para-

graphs have been deleted.

The manual issue and revision status are indicated by the last

three digits of the manual IPN. These digits start at 100 and will

increment through 200, 300, etc., as the manual is updated and

republished, e.g:

The last two digits are used for manuals published in an updata-

ble ring binder format and do not apply to this manual.

PCB Information PCB information is provided for all current issue PCBs, as well

as all previous issue PCBs manufactured in production quanti-

ties, and is grouped according to PCB. Thus, you will find the

parts list, grid reference index (if necessary), PCB layouts and

circuit diagram(s) for each individual PCB grouped together.

Errors If you find an error in this manual, or have a suggestion on how

it might be improved, please do not hesitate to contact the Tech-

nical Writer, Radio Infrastructure Division, Tait Electronics Ltd,

P.O. Box 1645, Christchurch, New Zealand.

Technical Information

Any enquiries regarding this manual or the equipment it describes should be addressed

in the first instance to your nearest approved Tait Dealer or Service Centre. Further

technical assistance may be obtained from the Customer Support Group, Radio Infra-

structure Division, Tait Electronics Ltd, Christchurch, New Zealand.

Updating Equipment And Manuals

In the interests of improving performance, reliability or servicing, Tait Electronics Ltd

reserve the right to update their equipment and/or manuals without prior notice.

1 0 0

issue status revision status

4M889-00

02/10/95 Copyright TEL

All information contained in this manual is the property of Tait Electronics Ltd. All

rights are reserved. This manual may not, in whole or part, be copied, photocopied,

reproduced, translated stored or reduced to any electronic medium or machine readable

form without prior written permission from Tait Electronics Ltd.

Ordering Tait Service Manuals

Service Manuals should be ordered from your nearest Tait Branch or approved Dealer.

When ordering, quote the Tait Internal Part Number (IPN) and, where applicable, the

version.

Date Of Issue

IPN M889-00-100 T889 Power Amplifier Service Manual

Issue 100 published October 1995

M889-00 5

Table Of Contents

This manual is divided into seven Sections as listed below. There is a detailed table of

contents at the start of each Section.

Section Title

1 General Information

2 Circuit Operation

3 Introduction To Servicing

4 Initial Tuning & Adjustment

5 Fault Finding

6 Installation

7 PCB Information

6M889-00

02/10/95 Copyright TEL

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The total number of pages in this Manual is 64, as listed below.

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M889-00 General Information 1.1

1 General Information

This section provides a brief description of the T889 PA, along with detailed specifica-

tions and a list of variants available.

The following topics are covered in this section.

Section Title Page

1.1 Introduction 1.3

1.2

1.2.1

1.2.2

Specifications

Introduction

General

1.4

1.3 Versions 1.6

1.2 General Information M889-00

02/10/95 Copyright TEL

M889-00 General Information 1.3

1.1 Introduction

The T889 is an FM base station power amplifier designed for single or multichannel

operation within the frequency range 800 to 870MHz. The output power capability is 20

to 100W.

The PA comprises a broad band, two stage drive amplifier whose output is split to drive

four separate output stages. The outputs from these final stages are then recombined

and filtered before being fed to the output socket. This type of balanced output stage

offers two advantages over single ended types:

- improved intermodulation performance in the presence of high signal levels

from adjacent transmitters;

- enhanced reliability: if one of the four output stages fails, the transmitter can

still produce half its rated power.

VSWR and thermal protection is incorporated into the basic design, while monitoring

and alarm signals are available for both forward and reverse power. The output power

is adjustable from the front panel.

The main PCB is mounted directly on a die-cast chassis/heatsink. For long-term relia-

bility, four high quality, low loss Teflon PCBs are sweated to the main PCB in areas of

high RF current. Extensive use is also made of the latest surface mount technology.

Forced air cooling for the heatsink is provided on the T889 by a fan, which is activated

whenever the transmitter is keyed. Thermal sensors will also activate the fan automati-

cally if the internal temperature reaches an unacceptable level.

The T889 has a width of 120mm, occupying a double module in a Tait rack shelf

(T99-770) which will accommodate up to seven standard modules to give an attractive

and convenient installation.

1.4 General Information M889-00

02/10/95 Copyright TEL

1.2 Specifications

1.2.1 Introduction

The performance figures given are minimum figures, unless otherwise indicated, for

equipment tuned with the maximum switching band and operating at standard room

temperature (+22°C to +28°C).

Where applicable, the test methods used to obtain the following performance figures are

those described in the EIA specification. However, there are several parameters for

which performance according to the CEPT specification is given.

Details of test methods and the conditions which apply for Type Approval testing in all

countries can be obtained from Tait Electronics Ltd.

1.2.2 General

Power Output:

Rated Power .. 90W

Range Of Adjustment .. 20 to 100W (typical)

Duty Cycle Rating: .. 90W continuous to +60°C

Intermodulation .. -70dBc or -40dBi1with 25dB isolation

(PA with output isolator) & interfering signal of -30dBc

Mismatch Capability:

Ruggedness .. infinite VSWR

Stability .. 5:1 VSWR (all phase angles)

Supply Voltage:

Operating Voltage .. 10.8 to 16V DC

Standard Test Voltage .. 13.8V DC

Polarity .. negative earth only

Polarity Protection .. diode

Supply Current:

Standby .. 50mA

Transmit .. 27A (20A typical @ 850MHz)

1. dBi denotes the level of the intermodulation product relative to the interfering signal.

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