Tait TEL0038, TEL0040 Cct Description Parts List / Manual

M830P-00 1

T830 Series II Paging

Base Station Equipment

148-174MHz

Initial Adjustment Manual

July 2000

M830P-00-1A0

Copyright TEL 01/07/00

2 M830P-00

T800

T800

Head Office
New Zealand

Tait Electronics Ltd
558 Wairakei Road
P.O. Box 1645
Christchurch
New Zealand
Phone: [phone]
Fax: [phone]

Radio Systems Division

535 Wairakei Road
P.O. Box 1645
Christchurch
New Zealand
Phone: [phone]
Fax: [phone]

Australia

Tait Electronics (Aust) Pty Ltd
186 Granite Street
Geebung
Queensland 4034
P. O . B o x 67 9
Virginia
Queensland 4014
Australia
Phone: [phone]
Toll Free: 1800 077-112
Fax: [phone]

Beijing

Tait Mobile Radio (HK) Ltd
Beijing Representative Office
Room 812, Tower A
Beijing Bright China
Chang An Building
No. 7 Jianguomennei Dai Jei
Dongcheng District
Beijing
China 100005

Canada

Tait Mobile Radio Inc.
Unit 5, 158 Anderson Avenue
Markham
Ontario L6E1A9
Canada
Phone: [phone]
Toll Free: 1 800 890-8248
Fax: [phone]

France

Tai t F r an c e S a rl
2 Avenue de la Cristallerie
92 316 Sèvres, Cedex
France
Phone: [phone]
Fax: [phone]

Germany

Tait Mobilfunk GmbH
Willstätterstraße 50
D-90449 Nürnberg 60
Germany
Phone: [phone]
Fax: [phone]

Hong Kong

Tait Mobile Radio (HK) Ltd
Unit 2216, North Tower
Concordia Plaza
1, Science Museum Road
Tsim Sha Tsui East
Kowloon
Phone: [phone]
Fax: [phone]

New Zealand

Tait Communications Ltd
Unit 4, 75 Blenheim Road
P. O. Bo x 1 1 8 5
Christchurch
Phone: [phone]
Fax: [phone]

Singapore

Tait Electronics (Far East) Pte
Ltd
4 Leng Kee Road
SIS Building #05-11A
Singapore 159088
Phone: [phone]
Fax: [phone]

Ta i w a n

Tait Mobile (Taiwan) Ltd
1104, No. 142 Chung Hsiao E. Rd
Sec. 4
Ta ip e i
Ta iw a n
Phone: [phone]
Fax: [phone]

Thailand

Tait Mobile Radio Ltd
14/1 Suwan Tower
Third Floor
Soi Saladaeng 1
North Sathorn Road
Bangrak
Bangkok 10500
Thailand
Phone: [phone]
Fax: [phone]

United Kingdom

Tait Europe Ltd
Ermine Business Park
Ermine Road
Huntingdon
Cambridgeshire PE18 6YA
United Kingdom
Phone: [phone]
Fax: [phone]

USA

Tait Electronics (USA) Inc.
9434 Old Katy Road
Suite 110
Houston
Texas 77055
USA
Phone: [phone]
Toll Free: 1 800 222-1255
Fax: [phone]

Internet

http://www.taitworld.com

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M830P-00 3

About This Manual

Scope This manual contains general, technical, tuning and adjustment

information on T830 Series II 50W and 100W paging base sta­tions which comprise the following equipment:

50W base station T837 paging exciter

T838 50W power amplifier

100W base station T837 paging exciter

T839 100W power amplifier

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

as all previous issue PCBs manufactured in production quanti­ties, 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 Customer
Support, Tait Electronics Ltd, Christchurch, New Zealand (full
contact details are on page 2).

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.

Copyright

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

You can order additional copies of this manual from your nearest Tait Dealer or Cus­tomer Service Organisation. When ordering, make sure you quote the correct Tait prod­uct code ("M" number). Note that only the latest issue of the manual will be available
for order.

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4 M830P-00

Table O f C ontents

This manual is divided into eight parts as listed below, with each part being further sub­divided into sections. There is a detailed table of contents at the start of each part and/
or section.

Part Title

A Introduction To Servicing

B T835 Receiver - not used in this manual

C T837 Paging Exciter

D T838 & T839 Power Amplifiers

E T830 VCO PCB Information

F Installation

G T800-28-0X00 Paging Rack Frame

H T800 Ancillary Equipment

1

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M830P-00 AI

Part A Introduction To Servicing

This part of the manual is divided into the sections listed below. These sections provide
some general and advisory information on servicing procedures, and a brief history of
PGM800Win programming software.

Section Title Page

1

1.1

1.2

1.3

1.4

2

2.1

2.2

2.3

2.3.1

2.3.2

2.4

2.5

3

3.1

3.1.1

3.1.2

General

Additional Technical Information

Caution: CMOS Devices

Caution: Aerial Load

Caution: Beryllium Oxide & Power Transistors

Mechanical

Torx Recess Head Screws

Pozidriv & Philips Recess Head Screws

Disassembly/Reassembly

Exciters
Power Amplifiers

Cover Screw Torques

Chassis & Cover Compatibility

Component Replacement

Leaded Components

Desoldering Iron Method
Component Cutting Method

1.1

1.1

1.1

1.2

1.2

2.1

2.1

2.2

2.3

2.3

2.3

2.3

2.4

3.1

3.1

3.1

3.1

3.2

3.3

4

4.1

4.2

Surface Mount Devices

Cased Mica Capacitors

Software History

PGM800Win V1.0

PGM800Win V2.00

Figure Title Page

1.1

1.2

2.1

2.2

2.3

Typical Product Code & Serial Number Labels

Typical Anti-static Bench Set-up

Torx Screw Identification

Pozidriv & Philips Screw & Screwdriver Identification

Identification Of New-Design Chassis & Covers

3.2

3.2

4.1

4.1

4.1

1.1

1.2

2.1

2.2

2.4

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AII M830P-00

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M830P-00 General A1.1

1 General

1.1 Additional Technical Information

If you have any questions about this manual or the equipment it describes, please con­tact your nearest Tait Dealer or Customer Service Organisation. If necessary, you can get
additional technical help from Customer Support, Tait Electronics Ltd, Christchurch,
New Zealand (full contact details are on page 2).

When requesting information, please quote either the manual product code (e.g.
M830P-00-1TA), or the equipment product code and serial number which are printed on
a label on the back of the product (as shown in Figure 1.1).

this area used for regional
Type Approval information

T838-10-0000

Rev 1

900000

Tait Electronics Limited
Made in New Zealand

Figure 1.1 Typical Product Code & Serial Number Labels

product code
serial number

T835-10-0000 Rev 1

Tait Electronics Limited
Made in New Zealand

900000

If you require information about a particular PCB, please quote the full PCB internal
part number (IPN) which is screen printed onto the top side of the board (refer to the
appropriate PCB Information section in this manual for more details).

1.2 Caution: CMOS Devices

This equipment contains CMOS Devices which are susceptible to damage from static
charges. Care when handling these devices is essential. For correct handling proce­dures refer to the manufacturers' data books, e.g. Philips data books covering CMOS
devices, or Motorola CMOS data books, Section 5 'Handling', etc.

An anti-static bench kit (refer to Figure 1.2) is available from Tait Electronics Ltd under
the following product codes:

• KS0001 - 1 conductive rubber bench mat

- 1 earth lead to connect the mat to ground

• KS0004 - 1 wrist strap.

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A1.2 General M830P-00

conductive

wrist strap

to building earth
(not mains earth)

Figure 1.2 Typical Anti-static Bench Set-up

1.3 Caution: Aerial Load

conductive rubber

bench mat

The equipment has been designed to operate safely under a wide range of aerial loading
conditions. However, we strongly recommend that the transmitter should always be
operated with a suitable load to prevent damage to the transmitter output power stage.

1.4 Caution: Beryllium Oxide & Power Transistors

The RF power transistors in current use all contain some beryllium oxide. This sub­stance, while perfectly harmless in its normal solid form, can become a severe health
hazard when it has been reduced to dust. For this reason the RF power transistors
should not be broken open, mutilated, filed, machined, or physically damaged in any
way that can produce dust particles.

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M830P-00 Mechanical A2.1

2 Mechanical

2.1 Torx Recess Head Screws

Torx recess head screws are becoming the standard screw head type in all T800 Series II
equipment, with Pozidriv and Philips recess head screws being used in fewer applica­tions.

The Torx recess head has the advantage of improved screwdriver tip location, reducing
the chances of screw head damage caused by the driver tip rotating within the recess. In
addition, using a ball-tip Torx screwdriver allows you to drive a Torx head screw with
the driver on a slight angle, which can be useful in situations where access is restricted.

It is important that you use the correct Torx screwdriver tip:

M3 screws - T10
M4 screws - T20.

Figure 2.1 below shows a typical Torx recess head screw (actual hardware may differ
slightly from this illustration due to variations in manufacturing techniques).

"star" shaped recess with
six internal notches

Figure 2.1 Torx Screw Identification

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A2.2 Mechanical M830P-00

2.2 Pozidriv & Philips Recess Head Screws

Pozidriv and Philips recess head screws will continue to be used in T800 Series II equip­ment in a few special applications. It is important that you use the correct type and size
screwdriver for each screw type to avoid damaging the screw head.

It is particularly important that you do not use Philips screwdrivers on Pozidriv screw
heads as the tapered driving flutes of the Philips screwdriver do not engage correctly
with the parallel-sided slots in the Pozidriv screw head. This can result in considerable
damage to the screw head if the screwdriver tip turns inside the recess.

Note:

If you find you need excessive downwards pressure to keep the screwdriver
tip in the Pozidriv screw head, you are probably using the wrong type and/
or size screwdriver.

Figure 2.2 below shows the main differences between typical Pozidriv and Philips screw
heads and screwdriver tips (actual hardware may differ slightly from these illustrations
due to variations in manufacturing techniques).

Pozidriv Philips

internal notches

no special markings

"star" markings
between slots

slots with parallel sides

slots with tapered sides

driving flutes with
parallel sides

driving flutes with
tapered sides

ridges between
driving flutes

Figure 2.2 Pozidriv & Philips Screw & Screwdriver Identification

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M830P-00 Mechanical A2.3

2.3 Disassembly/Reassembly

2.3.1 Exciters

To carry out alignment or change option links, you need to remove only the top cover,
i.e. the one adjacent to the front panel handle and on the opposite side to the main
D-range connector (D-range 1/PL100).

You need to remove the bottom cover to access:

•Q370

• solder link SL501 (fast key option).

2.3.2 Power Amplifiers

You should carry out the tuning and power output level setting procedures with the
cover on.

2.4 Cover Screw Torques

Exciters .. 1.36Nm/12in.lbf.

Power Amplifiers .. 0.9Nm/in.lbf.

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A2.4 Mechanical M830P-00

2.5 Chassis & Cover Compatibility

The chassis and covers used in T800 Series II modules incorporate a number of design
changes to improve Electro-Magnetic Compatibility (EMC) performance. It is impor­tant that only the new-design covers are fitted to the new chassis to ensure correct
mechanical fit and continued compliance with appropriate EMC Type Approval regula­tions.

Figure 2.3 below shows some of the main features which can be used to identify the
new-design chassis and covers.

Chassis

←Top View

loom channel in
top of walls

Rear View

4 holes in
rear panel

→

groove in top
of rear wall

Top Cover

provision for mounting speaker
(future development)

ridge on top
of rear wall

Bottom Cover

additional walls

Figure 2.3 Identification Of New-Design Chassis & Covers

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M830P-00 Component Replacement A3.1

3 Component Replacement

3.1 Leaded Components

Whenever you are doing any work on the PCB that involves removing or fitting compo­nents, you must take care not to damage the copper tracks. The two satisfactory meth­ods of removing components from plated-through hole (PTH) PCBs are detailed below.

Note:

The first method requires the use of a desoldering station, e.g. Philips SBC
314 or Pace MBT-100E.

3.1.1 Desoldering Iron Method

Place the tip over the lead and, as the solder starts to melt, move the tip in a circu­lar motion.

Start the suction and continue the movement until 3 or 4 circles have been com­pleted.

Remove the tip while continuing suction to ensure that all solder is removed from
the joint, then stop the suction.

Before pulling the lead out, ensure it is not stuck to the plating.

If the lead is still not free, resolder the joint and try again.

Note:

The desoldering iron does not usually have enough heat to desolder leads
from the ground plane. Additional heat may be applied by holding a sol­dering iron on the tip of the desoldering iron (this may require some addi­tional help).

3.1.2 Component Cutting Method

Cut the leads on the component side of the PCB.

Heat the solder joint
out from the component side: do

Fill the hole with solder and then clear with solderwick.

Copyright TEL 01/07/00

sufficiently

to allow

not

easy

use undue force.

removal of the lead by drawing it

A3.2 Component Replacement M830P-00

3.2 Surface Mount Devices

Caution: Surface mount devices (SMDs) require special storage, handling,

removal and replacement techniques. This equipment should be serv­iced only by an approved Tait Dealer or Customer Service Organisa­tion equipped with the necessary facilities. Repairs attempted with
incorrect equipment or by untrained personnel may result in perma­nent damage. If in doubt, contact your nearest Tait Dealer or Customer
Service Organisation.

3.3 Cased Mica Capacitors

Cased mica capacitors can be removed by heating the top with a heavy-duty soldering
iron and gently lifting the capacitor off the PCB with a solder-resistant spike or equiva­lent.

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M830P-00 Software History A4.1

4 Software History

28/06/96 PGM800Win Version 1.0
18/08/97 PGM800Win Version 2.00

4.1 PGM800Win V1.0

PGM800Win V1.0 is different in concept from DOS versions of PGM800 in that it is Win-

1

dows
PGM800.

The major changes are outlined below:

based. It also includes many new and improved features over DOS versions of

• The Windows

• PGM800Win includes several new radio models which are not programmable
with DOS versions of PGM800.

• Out of range frequencies will result in warning messages and will not be accepted
for entry into the standard library module. User defined modules can be created,
however, allowing variation from the standard library module.

• Channel numbers default to 0-127 to match the EPROM memory locations. How­ever, the user can change this setting so that the channel numbers run from 1-128
to suit his/her particular needs.

Note:

The data files produced by BASEPROG V1.0 and all DOS versions of
PGM800 are still compatible with PGM800Win V1.0.

 environment makes data entry and editing significantly easier.

4.2 PGM800Win V2.00

PGM800Win V2.00 is an upgraded and expanded version of PGM800Win V1.0. It has
been developed specifically for T800 Series II base stations, but retains the ability to pro­gram Series I equipment.

The major changes are outlined below:

• PGM800Win V2.0 will program T800 Series II base station modules via serial com­munications.

• Deviation and reference modulation settings are written automatically to the
radio.

1. Windows is a registered trademark of the Microsoft Corporation.

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A4.2 Software History M830P-00

• Extra information that is not stored in the radio (but which is still relevant to the
radio) can be saved to a file on disk (e.g. note field, auxiliary pin names, etc.).

Note:

The data files produced by BASEPROG V1.0, all DOS versions of PGM800,
and PGM800Win V1.0 are still compatible with PGM800Win V2.00.

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M830P-00 BI

Part B T835 Receiver

The T835 receiver is not covered in this manual. Refer to M830-00-201 (or later issue) for
servicing information on the T835.

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BII M830P-00

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M830P-00 CI

Part C T837 Paging Exciter

This part of the manual is divided into six 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 Initial Tuning & Adjustment

4 Functional Testing

5 Fault Finding

6 PCB Information

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CII M830P-00

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M830P-00 T837 General Information C1.1

1 T837 General Information

This section provides a brief description of the T837 paging exciter, along with detailed
specifications and a list of types available.

The following topics are covered in this section.

Section Title Page

1.1 Introduction 1.5

1.2

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.2.6

1.2.6.1

1.2.6.2

1.2.6.3

1.3 Product Codes 1.10

1.5 T837 Paging Product Range 1.11

Specifications

Introduction

General

RF Section

Low Speed Paging Modulator

Microcontroller

Tes t S ta nd a r ds

European Telecommunication Standard
Telecommunications Industry Association
Chinese Radio Regulatory Commission

1.6

1.6

1.6

1.7

1.8

1.8

1.8

1.8

1.8

1.9

Figure Title Page

1.1 T837 Main Circuit Block Identification 1.4

1.2 T837 Front Panel Controls 1.4

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C1.2 T837 General Information M830P-00

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M830P-00 T837 General Information C1.3

replace A4 pages C1.3/C1.4 with A3 pages C1.3/C1.4

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C1.4 T837 General Information M830P-00

replace A4 pages C1.3/C1.4 with A3 pages C1.3/C1.4

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M830P-00 T837 General Information C1.5

1.1 Introduction

The T837 is a synthesised, microprocessor controlled, DFSK low speed paging exciter
designed for single or multichannel

1

operation in the 148 to 174MHz frequency range2.
With a standard power output of only 800mW, the exciter is designed for use with the
T839 100W power amplifier. The RF section of the exciter comprises a frequency syn­thesiser which provides 170mW of frequency modulated RF drive to a two stage, wide
band output amplifier. The synthesiser frequency is programmed via the serial commu­nications port.

The low speed paging modulator section provides DFSK modulation. It incorporates a
TCXO frequency reference and uses two point modulation to achieve modulation of
data rates from 2400bps down to DC.

All components except those of the VCO are mounted on a single PCB. This is secured
to a die-cast chassis which is divided into compartments to individually shield each sec­tion of circuitry. Access to both sides of the main circuit board is obtained by removing
each of the chassis lids. There is provision within the chassis to mount small option
PCBs.

The front panel has two indicator LEDs to show when the transmit carrier is on (red)
and when the DC supply is connected (green). The T837 is 60mm wide and occupies a
single space in a Tait rack frame, which has the ability to accommodate up to seven
standard modules.

1. Although you can program the microcontroller with up to 128 channels, you must
carry out the modulation adjustment procedure if you change frequency (see Section

3.5).

2. Although capable of operating over the 148-174MHz frequency range, the T837 has an
8MHz VCO switching range (see Section 1.2.3 and Section 3.1).

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C1.6 T837 General Information M830P-00

1.2 Specifications

1.2.1 Introduction

The performance figures given are minimum figures, unless otherwise indicated, for
equipment tuned with the maximum switching range and operating at standard room

temperature (+22°C to +28°C) and standard test voltage (13.8V DC).

Where applicable, the test methods used to obtain the following performance figures are
those described in the EIA and ETS specifications. However, there are several parame­ters for which performance according to the Chinese specification GB/T 15938 is given.
Refer to Section 1.2.6 for details of test standards.

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

Number Of Channels .. 128 (standard)

Supply Voltage:

Operating Voltage .. 10.8 to 16V DC
Standard Test Voltage .. 13.8V DC
Polarity .. negative earth only
Polarity Protection .. crowbar diode
Line Keying Supply (if required) .. -50V DC

Supply Current:

Tr an s mi t . . < 6 50 m A
Standby - T837-2X-1020 .. <150mA

- T837-2X-1021 .. <200mA

Operating Temperature Range .. -30°C to +60°C

Dimensions:

Height .. 183mm
Width .. 60mm
Length .. 320mm

1

Weight .. 2.1kg

Time-Out Timer (optional) .. 0 to 5 minutes

ond steps

1. Additional channels may be factory programmed. Contact your nearest Tait Dealer or
Customer Service Organisation.

2. Adjustable from 0 to 10 minutes in PGM800Win version 2.12 and later.

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2

adjustable in 10 sec-

M830P-00 T837 General Information C1.7

Tail Timer .. 0 to 5 seconds adjustable in 100ms1

steps

Tra ns mi t K ey Tim e:

T837-20-102X .. <100ms
T837-26-102X .. <30ms

Transmit Lockout Timer .. 0 to 1 minute adjustable in 10 second

steps

1.2.3 RF Section

Frequency Range .. 148-174MHz

Modulation Type .. DFSK

Frequency Increment:

T837-20-102X .. 5 or 6.25kHz
T837-26-102X .. 2.5 or 3.125kHz

VCO Switching Range .. 8MHz

Load Impedance .. 50 ohms

Frequency Stability:

T837-2X-1020 .. ±1.0ppm, -20°C to +70°C

±2.0ppm, -30°C to +70°C

T837-2X-1021 .. ±1.5ppm, -30°C to +70°C

External Reference Frequency .. 100kHz to 25.6MHz in 100kHz steps
(T837-2X-1021)

External Reference Amplitude .. 0 to +10dBm into 50Ω

Adjacent Channel Power .. -75dBc (ETS)
(4.5kHz deviation) -70dBc (GB/T 15938)

Transmitter Side Band Noise:
(no modulation, 15kHz bandwidth)

At ±25kHz .. -95dBc
At ±1MHz .. -105dBc

Radiated Spurious Emissions:

Transmit .. -36dBm to 1GHz

-30dBm to 4GHz

Standby .. -57dBm to 1GHz

-47dBm to 4GHz

1. Adjustable in 20ms steps in PGM800Win version 2.12 and later.

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C1.8 T837 General Information M830P-00

Power Output .. 800mW ±200mW

Transmit Keying Noise .. -70dBc (GB/T 15938)

1.2.4 Low Speed Paging Modulator

Accepted Protocols/Speeds:

T837-20-102X .. POCSAG 512/1200 and FLEX 1600
T837-26-102X .. POCSAG 512/1200/2400 and

FLEX 1600

Input Data Levels .. TTL

Data Rise Time (10% - 90%):

T837-20-102X .. <150µs (GB/T 15938)
T837-26-102X .. <115µs

1.2.5 Microcontroller

Auxiliary Ports:

Open Drain Type .. capable of sinking 2.25mA via 2k2Ω

max. .. 5V

V

ds

1.2.6 Test Standards

Where applicable, this equipment is tested in accordance with the following standards.

1.2.6.1 European Telecommunication Standard

ETS 300 113 March 1996

Radio equipment and systems; land mobile service; technical characteristics and test
conditions for radio equipment intended for the transmission of data (and speech) and
having an antenna connector.

1.2.6.2 Telecommunications Industry Association

ANSI/TIA/EIA-603-1992

Land mobile FM or PM communications equipment measurement and performance
standards.

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M830P-00 T837 General Information C1.9

1.2.6.3 Chinese Radio Regulatory Commission

GB/T 15938 - 1995

General specification for equipment of radio paging systems.

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C1.10 T837 General Information M830P-00

1.3 Product Codes

The three groups of digits in the T830 Series II product code provide information about
the model, type and options fitted, according to the conventions described below.

The following explanation of T830 Series II product codes is not intended to suggest that
any combination of features is necessarily available in any one product. Consult your
nearest Tait Dealer or Customer Service Organisation for more information regarding
the availability of specific models, types and options.

Model

The Model group indicates the basic function of the product, as follows:

T83X

-XX-XXXX T837 exciter
T838 50W power amplifier
T839 100W power amplifier

Type

The Type group uses two digits to indicate the basic RF configuration of the product.

The first digit in the Type group designates the frequency range:

T83X-X

The second digit in the Type group indicates the channel spacing:

T83X-XX

X-XXXX ’2’ for 148-174MHz

-XXXX ’0’ for wide bandwidth (25kHz) - standard
’6’ for wide bandwidth (25kHz) - USA

Options

T83X-XX-XXXX The Options group uses four digits and/or letters to indicate

any options that may be fitted to the product. This includes
standard options and special options for specific customers.
’0000’ indicates a standard Tait product with no options fitted.
The large number of options precludes listing them here.

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