Tait TB8100, TB9100, T801-4 Installation And Operation Manual

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TB8100 base station TB9100 base station

T801-4 GPS Frequency Reference Installation and Operation Manual

MBA-00033-01 Issue 1 September 2007

2 T801-4 Installation and Operation Manual

Contact Information

Tait Radio Communications Corporate Head Office

Tait Electronics Limited P.O. Box 1645 Christchurch New Zealand

For the address and telephone number of regional offices, refer to the TaitWorld website:

We b si t e : www.taitworld.com

Technical Support

For assistance with specific technical issues, contact Technical Support:

E-mail: support@taitworld.com We b si t e : www.taitworld.com/technical

All information contained in this document is the property of Tait Electronics Limited. All rights reserved. This document may not, in whole or in part, be copied, photocopied, reproduced, translated, stored, or reduced to any electronic medium or machine-readable form, without prior written permission from Tait Electronics Limited.

The word TAIT and the TAIT logo are trademarks of Tait Electronics Limited.

All trade names referenced are the service mark, trademark or registered trademark of the respective manufacturers.

Disclaimer

There are no warranties extended or granted by this document. Tait Electronics Limited accepts no responsibility for damage arising from use of the information contained in the document or of the equipment and software it describes. It is the responsibility of the user to ensure that use of such information, equipment and software complies with the laws, rules and regulations of the applicable jurisdictions.

Enquiries and Comments

If you have any enquiries regarding this document, or any comments, suggestions and notifications of errors, please contact Technical Support.

Updates of Manual and Equipment

In the interests of improving the performance, reliability or servicing of the equipment, Tait Electronics Limited reserves the right to update the equipment or this document or both without prior notice.

Intellectual Property Rights

This product may be protected by one or more patents of Tait Electronics Limited together with their international equivalents, pending patent applications and registered trade marks: NZ338097, NZ508054, NZ508340, NZ508806, NZ508807, NZ 509242, NZ509640, NZ509959, NZ510496, NZ511155, NZ511421, NZ516280/519742, NZ519118, NZ519344, NZ520650/537902, NZ522236, NZ524369, NZ524378, NZ524509, NZ 524537, NZ524630, NZ530819, NZ534475, NZ 534692, NZ535471, NZ536945, NZ537434, NZ 546295, NZ547713, NZ521450, AU2003281447, AU2002235062, AU2004216984, AU2005207405, CA2439018, CA2554213, EU 03784706.8, EU02701829.0, EU04714053.8, EU05704655.9, GB23865476, GB2386010, GB2413249, GB0516092.4, US11,232716, US10/597339, US10/ 520827, US10/468740, US5,745,840, US10/547653, US10/546696, US10/547964, US10/523952, US11/

572700.

Environmental Responsibilities

Tait Electronics Limited is an environmentally responsible company which supports waste minimization, material recovery and restrictions in the use of hazardous materials.

The European Union’s Waste Electrical and Electronic Equipment (WEEE) Directive requires that this product be disposed of separately from the general waste stream when its service life is over. For more information about how to dispose of your unwanted Tait product, visit the Tait Electronics WEEE website at

www.taitworld.com/weee. Please be environmentally

responsible and dispose through the original supplier, or contact Tait Electronics Limited.

Tait Electronics Limited also complies with the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive in both the European Union and China.

In China, we comply with the Measures for Administration of the Pollution Control of Electronic Information Products. We will comply with environmental requirements in other markets as they are introduced.

T801-4 Installation and Operation Manual 3 © Tait Electronics Limited September 2007

Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Associated Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Publication Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.2 Mechanical Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1 Identifying the T801-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.2 Mechanical Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.3 Connections and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1.3.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1.3.2 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.4 Back-up Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.1 System Start-up and Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.2 Loss of Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.3 Oscillator Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.4 Valid GPS Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.5 Invalid GPS Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.6 Ageing Correction Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.7 GPS Fix Acquisition Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2.8 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.9 1PPS Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.1 Installing the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.2 Connecting and Logging On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.3 Setting Up the Satsync 7 Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.4 Viewing the Data Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.5 Viewing the GPS Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.6 Upgrading the Satsync 7 Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4 System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

4.1 Setting the Links on the System Interface Board . . . . . . . . . . . . . . . . . . . . . . . . 50

4 T801-4 Installation and Operation Manual

4.2 T801-4 with Internal GPS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4.3 T801-4 with External GPS Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.4 T801-4 with Internal and External GPS Receivers . . . . . . . . . . . . . . . . . . . . . . 57

4.5 T801-4 with a Single QS

RSU Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.6 T801-4 with Dual QS

RSU Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

4.6.1 Connection and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

4.6.2 Alarms and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

5.1 Personal Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.1.1 Explosive Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.1.2 Battery Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.1.3 High Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.1.4 LED Safety (EN60825-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.2 Equipment Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.2.1 ESD Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.2.2 Equipment Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.2.3 Installation and Servicing Personnel . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.3 Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.3.1 FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.3.2 Unauthorised Modifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

5.3.3 Health, Safety and Electromagnetic Compatibility in Europe. . . . . . . 76

5.4 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.4.1 Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.4.2 Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.4.3 Dust and Dirt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.5 Grounding and Lightning Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.5.1 Electrical Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.5.2 Lightning Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

5.6 Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5.7 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5.8 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5.9 Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

5.10 Disposal of Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

7 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Tait General Software Licence Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Directive 1999/5/EC Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . 89

Chinese RoHS Compliance Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

T801-4 Installation and Operation Manual 5 © Tait Electronics Limited September 2007

List of Illustrations

Figure 1.1 High level block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 1.2 Mechanical assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 1.3 Connections and controls on the front panel . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 1.4 Connections and controls on the rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 1.5 Connecting one 1PPS TTL output to multiple TB9100 base stations . . . . . . . . 25

Figure 4.1 Location of links on the system interface board . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 4.2 Connecting the T801-4 to a GPS antenna. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 4.3 Connecting the T801-4 to an external GPS receiver . . . . . . . . . . . . . . . . . . . . 55

Figure 4.4 Connecting the T801-4 to a GPS antenna and external GPS receiver . . . . . . . . 58

Figure 4.5 Connecting the T801-4 to a single QS

RSU . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 4.6 Connecting the T801-4 to dual QS

RSU receivers . . . . . . . . . . . . . . . . . . . . 66

Figure 5.1 Typical antistatic bench set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Figure 5.2 Chassis mounting points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

6 T801-4 Installation and Operation Manual

Preface

Scope of Manual

Welcome to the T801-4 GPS frequency reference Installation and Operation Manual. This manual provides information on programming, installing and operating the T801-4. Also included in this manual are a functional description and specifications.

Document Conventions

“Options > Connect” means “click Options on the menu bar, then click Connect on the list of commands that pops up”.

Small capitals are used when quoting text which is printed on the front or rear panels, e.g.

MASTER OSCILLATOR LED, DIP SWITCHES, or I/O PORT.

Within this manual, four types of alerts are given to the reader: Warning, Caution, Important and Note. The following paragraphs illustrate each type of alert and its associated symbol.

Warning!! This alert is used when there is a potential risk

of death or serious injury.

Caution This alert is used when there is a risk of minor or

moderate injury to people.

Important This alert is used to warn about the risk of equipment dam-

age or malfunction.

Note This alert is used to highlight information that is required to

ensure procedures are performed correctly.

T801-4 Installation and Operation Manual 7 © Tait Electronics Limited September 2007

Associated Documentation

The following associated documentation is available for this product:

■ The Dalman 40742 GPS antenna/receiver manual is provided in PDF

format on the Product CD.

■ Additional GPS information is available on the Dalman website

(www.dalmants.co.uk/GPSRx/GPSRx-HintsTips.html).

■ Additional information on the Trimble Bullet III active antenna is

available on the Trimble website (www.trimble.com/bullet3.shtml).

■ T805-26-0000 Remote Site Unit Service Manual (MNA-00016-xx,

Chapter 4).

Technical notes are published from time to time to describe applications for Tait products, to provide technical details not included in manuals, and to offer solutions for any problems that arise.

All available T801-4 product documentation is provided on the Product CD supplied with the unit. Updates may also be published on the Tait Technical Support website (www.taitworld.com/technical).

Abbreviations

Abbreviation Description

CTCSS Continuous Tone-Controlled Squelch System

DAC Digital-to-Analog Converter

DCE Data Communications Equipment

DOP Dilution Of Precision

ET Engineering Terminal

GGA GPS fix data

NMEA 0183 data message

GPS Global Positioning System

GSA GPS DOP and active satellites

NMEA 0183 data message

GSV GPS Satellites in View

NMEA 0183 data message

NMEA National Maritime Electronics Association

(www.nmea.org)

NMEA 0183 a standard which specifies the messaging format used for

communicating with marine devices/components (www.nmea.org/pub/0183)

PMR Private Mobile Radio

8 T801-4 Installation and Operation Manual

Publication Record

PPM Parts Per Million

PPS Pulse Per Second

TaitNet QS2 simulcast system

RMC Recommended Minimum Specific GPS/transit data

NMEA 0183 data message

RSU Remote Site Unit

RTC Radio Technical Commission for Maritime services

SN Signal-to-Noise

SV Space Vehicle (satellite)

TPS A proprietary NMEA 0183 data message determined by the

manufacturer of the GPS receiver.

TTL Transistor– Transistor Logic

UTC Coordinated Universal Time

VCO Voltage Controlled Oscillator

Abbreviation Description

Issue Publication Date Description

1 September 2007 first release

T801-4 Installation and Operation Manual Description 9 © Tait Electronics Limited September 2007

1 Description

This chapter provides a brief functional and mechanical description of the T801-4 GPS frequency reference. It also provides detailed information on the controls and connections on the front and rear panels.

10 Description T801-4 Installation and Operation Manual

1.1 Functional Description

The T801-4 GPS frequency reference is an essential frequency reference for all TB8100 and TB9100 base station products when they are used in simulcast applications (for example, TaitNet QS

). It is based o n the Dalm an Satsync 7 module, which uses the Coordinated Universal Time (UTC) pulses derived from the US Global Positioning System (GPS) as an accurate and stable reference source. Frequency stability is achieved by locking an internal “master” oscillator to a 1 Pulse Per Second (1PPS) timing standard derived from the GPS via a GPS receiver. The T801-4 is fitted with one or two Satsync 7 modules, depending on the model (refer to “Identifying the

T801-4” on page 12).

The T801-4 provides up to eight frequency outputs in the range 50Hz to 25MHz. It has the option of using an internal and/or external GPS receiver. The internal receiver is the Trimble Lassen iQ GPS receiver module, and the external receiver is the Dalman 40742 GPS antenna/ receiver

, which has the GPS receiver integrated with the antenna. If both options are used, the T801-4 has the ability to change over to the “standby” receiver if the primary GPS receiver fails.

The T801-4 also provides the 1PPS signal from the GPS receiver(s) as TTL (50Ω) and RS-485 signals. These 1PPS outputs can be disabled if the GPS “fix” becomes invalid.

The Satsync 7 module is programmed and monitored with the Dalman Engineering Terminal (ET) PC software. Program access to the module is provided by an RS-232 port on the front panel.

Internal DC-DC converters take the externally provided 10.5VDC to 28VDC input and convert it into the 12VDC required by the internal modules. One converter is provided for each Satsync 7 module.

The T801-4 is packaged in a standard 19 inch 1U chassis. The programming port and alarm LEDs are on the front panel, while all other inputs and outputs, including DC power, are on the rear panel.

1. Available under the product code T801-40-0000.

T801-4 Installation and Operation Manual Description 11 © Tait Electronics Limited September 2007

Figure 1.1 High level block diagram

SMB2

SMB3

SMB4

SMB1

JP1

JP3

Satsync 7

Module 1

(standard)

CON1

SMB2

SMB3

SMB4

SMB1

JP1

JP3

Satsync 7

Module 2

(optional)

Front Panel

Board 2

CON1

J101

J100

Front Panel

Board 1

DC-DC

Converter 1

J206

SMA

J205

DC-DC

Converter 2

GPS

Receiver

BNC1

BNC2

BNC3

BNC4

BNC1

BNC2

BNC3

BNC4

Ground

Connector

J107

J106

J105

J104

J2J102 J3

J103

Rear Panel Connector Board

plug-socket

System Interface Board

Frequency Reference

Outputs Module 1

Frequency Reference

Outputs Module 2

1PPS TTL OutputsGPS

Antenna

Port A

Dalman GPS

I/O PortPort B

QS RSU

DC Inputs

Programming Port

Module 1

Programming Port

Module 2

12 Description T801-4 Installation and Operation Manual

1.2 Mechanical Description

1.2.1 Identifying the T801-4

You can identify the model and hardware configuration of a T801-4 by referring to the product code printed on a label on the rear panel. The product codes are explained in the table below.

Product Code Description

T801-41-8000 one Satsync 7 module fitted

internal GPS receiver not fitted

T801-41-8100 one Satsync 7 module fitted

internal GPS receiver fitted

T801-42-8000 two Satsync 7 modules fitted

internal GPS receiver not fitted

T801-42-8100 two Satsync 7 modules fitted

internal GPS receiver fitted

T801-4 Installation and Operation Manual Description 13 © Tait Electronics Limited September 2007

1.2.2 Mechanical Assembly

The main components and modules of the T801-4 are identified in

Figure 1.2 below. Note that Satsync 7 module 2 and its associated DC

converter and front panel boards are optional.

Figure 1.2 Mechanical assembly

Satsync 7 module 1 (standard)

DC input filter

Satsync 7 module 2 (optional)

system interface board

front panel

chassis

front panel board for Satsync 7 module 2

rear panel connector board

front panel board for Satsync 7 module 1

3V battery for optional internal GPS receiver (refer to “Back-up Battery” on page 26)

DC converter for Satsync 7 module 2

optional internal GPS receiver

DC converter for Satsync 7 module 1

14 Description T801-4 Installation and Operation Manual

1.3 Connections and Controls

1.3.1 Front Panel

There are two front panels available, depending on whether one or two Satsync 7 modules are fitted. Figure 1.3 identifies the controls and connections on a T801-4 fitted with two Satsync 7 modules.

PROGRAMMING PORT

This is a 9-way female D-range connector which is used to connect each Satsync 7 module to a PC running the ET software (refer to

“Programming” on page 35). It is a standard RS-232 interface (DCE). Use

the supplied TBA0P10

cable or a standard straight through cable to connect

the T801-4 to the PC. The pin allocations are given in the following table.

Figure 1.3 Connections and controls on the front panel

programming port

master oscillator status LED

GPS status LED

d bcd

Satsync 7 module 1 Satsync 7 module 2

1. This is the same cable that is used for programming TB8100 and TB9100 base stations.

Pin Description

1 not connected

2 receive data

3 transmit data

4 not connected

5 ground

6 not connected

7 not connected

8 not connected

9 not connected

cdef

external view

T801-4 Installation and Operation Manual Description 15 © Tait Electronics Limited September 2007

GPS LED This LED has two states:

■ Green indicates that the received 1PPS signal is valid (GPS fix).

■ Red indicates the received 1PPS signal has failed or is invalid.

MASTER OSCILLATOR LED

This LED has three states:

■ Green indicates that the control process is dynamic and that the master

oscillator frequency has reached a state where the accuracy is better than ±1 part in 10

(0.01ppm).

Important It is important to understand that green means that the

oscillator is approaching its specified maximum accuracy, and has passed the ±1 part in 10

level. Green does not necessarily mean that the oscillator has reached its specified maximum accuracy.

■ Amber indicates that the control process is locked because the 1PPS

signal has failed, and the level of accuracy immediately before the 1PPS failure was better than ±1 part in 10

■ Red indicates that it is not safe to assume that the master oscillator

frequency is correct. The LED will be red in the following situations:

■ after the LED has been amber (the control process has been

locked) continuously for 24 hours

■ the 1PPS signal is valid but the level of accuracy is less than ±1

part in 10

■ the 1PPS signal is invalid and the level of accuracy has not yet

reached a level of ±1 part in 10

(usually after initial power-up).

16 Description T801-4 Installation and Operation Manual

1.3.2 Rear Panel

Figure 1.4 Connections and controls on the rear panel

frequency reference outputs from Satsync 7 module 1

DC inputs

frequency reference outputs from Satsync 7 module 2

power LED

RF input from GPS antenna

GPS receiver LED: PORT A GPS receiver selected

I/O port

GPS receiver LED: PORT B or internal GPS receiver selected

RS-485 interface to external GPS receiver (PORT A)

1PPS valid LED

1PPS RS-485 interface to QS2 RSU (PORT B)

1PPS TTL outputs

DIP switches

ground connector

b cdefgh i

T801-4 Installation and Operation Manual Description 17 © Tait Electronics Limited September 2007

FREQUENCY OUTPUT 1 & 2

The frequency reference outputs are available on these BNC connectors. The T801-4 with one Satsync 7 module has two output frequency channels, and the T801-4 with two Satsync 7 modules has four output frequency channels. Each channel has two ports.

The frequency reference outputs have the following characteristics:

These outputs can be used to supply TB8100 and TB9100 reference frequency inputs (input impedance >1kΩ). In this situation the recommended maximum number of daisy-chained loads for each frequency output connector is 8. Each daisy chain must end with a 50Ω termination.

The accuracy of the frequency reference outputs is as follows.

■ With a valid GPS fix and the master oscillator locked, the accuracy tends

to ±1 part in 3 × 10

(depending on the installation).

■ Without a valid GPS fix, but with the master oscillator control voltage

fixed, the accuracy is subject to ±1 part in 5 × 10

(±0.02ppm), over the

quoted temperature range.

■ Without a valid GPS fix, and with the master oscillator following an

ageing trend, the accuracy will be determined by the ageing correction process (refer to “Ageing Correction Process” on page 30) or, if there is insufficient long-term data, by the characteristics of the crystal. The ageing characteristics of the crystal, as specified by the manufacturer, are:

- first year (after initial 30-day running time) ±0.1 ppm

- later years ±0.1ppm/year.

Accuracy is determined by comparing the master oscillator frequency with the GPS-derived 1PPS signal. The figures given here are typical of systems examined in a stable environment, and are subject to variation of the GPS 1PPS signal, which will average out over time.

GPS ANT This connection on the rear panel is a 50Ω female SMA connector. It not

only provides the RF input connection for the optional internal GPS receiver, but also provides the 3.3VDC power to the active antenna. Tait supplies and recommends the Trimble Bullet III active GPS antenna.

b c

■ impedance 50Ω

■ signal type sine wave, levels programmable from

185mVpp to 2Vpp minimum (approx. –10dBm to +10dBm)

■ frequency range 50Hz to 25MHz

■ frequency resolution 0.025Hz

■ maximum coaxial cable length 30m

18 Description T801-4 Installation and Operation Manual

I/O PORT This port is a 9-way male D-range connector. It provides connections for

the following signals:

■ outputs for GPS receiver and master oscillator alarms for both Satsync 7

modules

■ inputs for the CTCSS phase reversal for both Satsync 7 modules (only

available for frequencies ≤260Hz)

■ an output indicating which GPS receiver is active

■ an output indicating whether the 1PPS signal is valid.

The alarm lines can be connected to digital inputs on the TB8100 or TB9100 reciter system interface. Task Manager can be used to generate alarms from these inputs.

The pin allocations for the I/O port are described in detail in the following table.

T801-4 Installation and Operation Manual Description 19 © Tait Electronics Limited September 2007

Pin Signal Name

Signal Type Logic Notes

1 OSC ALRM OSC1 output open collector;

active = 0V; output low level <0.4V for <6mA sink current

oscillator alarm for Satsync 7 Module 1; maximum input voltage = 30V; maximum sink current = 45mA

2 OSC ALRM OSC2 output open collector;

active = 0V; output low level <0.4V for <6mA sink current

oscillator alarm for Satsync 7 Module 2; maximum input voltage = 30V; maximum sink current = 45mA

3 GPS ALRM OSC1 output open collector;

active = 0V; output low level <0.4V for <6mA sink current

GPS alarm for Satsync 7 Module 1; maximum input voltage = 30V; maximum sink current = 45mA

4 GPS ALRM OSC2 output open collector;

active = 0V; output low level <0.4V for <6mA sink current

GPS alarm for Satsync 7 Module 2; maximum input voltage = 30V; maximum sink current = 45mA

5 GPS RX IND output open collector;

high = internal GPS receiver or external port B GPS receiver selected; low = external port A GPS receiver selected; output low level <0.4V for <6mA sink current

maximum input voltage = 30V; maximum sink current = 45mA

6 GND ground

7 CTCSS PHS REV1

input

3.3V TTL; active low (<0.8 V)

maximum input voltage = 9V

8 CTCSS PHS REV2

9 1PPS VALID OUT output open collector;

active = 0V = 1PPS valid; output low level <0.4V for <6mA sink current

maximum input voltage = 30V; maximum sink current = 45mA

cdef

external view

20 Description T801-4 Installation and Operation Manual

PORT A - DALMAN GPS

This 15-way female D-range provides the RS-485 interface between the T801-4 and the Dalman external GPS receiver. This port provides connections for the following signals:

■ a regulated 12VDC output limited to 1.1A

■ a 1PPS signal input at standard TTL levels

■ a 1PPS RS-485 data pair input at standard RS-485 levels

■ a data link input (RS-485 data pair at standard RS-485 levels)

■ a data link output (RS485 data pair at standard RS-485 levels).

Thi s port is general ly refer red to as “

PORT A” in the rest of this manual. The

pin allocations for this port are described in detail in the following table.

Pin Signal Name

Signal Type Logic Notes

1 +12VDC power

output

power supply for Dalman external GPS receiver

2 RXD+ EXTNL A

input RS-485 NMEA data input

3 RXD– EXTNL A

4 1PPS+ EXTNL A

input 1PPS RS-485 input

5 1PPS– EXTNL A

6 1PPS VALID IN input active low (<0.8V) = 1PPS

valid

alternative input connection for VALID signal (from QS

RSU); internal 10kΩ pull-up resistor to 3.3V; maximum input voltage = 9V

7 not connected

8 1PPS TTL IN input 5V TTL maximum input voltage = 9V

9 not connected

10 TXD+ EXTNL A

output

RS-485 data output (not used)

11 TXD– EXTNL A

12 GND ground

13 not connected

14 not connected

15 not connected

external view

FGH

1!1@1#

1$1%

PORT B - RSU This RJ45 connector provides the RS-485 interface to the QS

RSU (remote site unit). It is used as the input for the signal from the GPS module in the RSU. It provides connections for the following signals:

■ a 1PPS RS-485 data pair input at standard RS-485 levels

■ a 1PPS RS-485 data pair output/input at standard RS-485 levels

■ a 1PPS VALID input

■ a 1PPS VALID output/input.

Thi s port is genera lly re ferred to as “

PORT B” in the rest of this m anual . The

pin allocations for this RJ45 connector are given in the following table. They are compatible with the QS

RSU.

Pin Signal Name

Signal Type Logic Notes

1 1PPS+ EXTNL B

input 1PPS RS-485 input

2 1PPS– EXTNL B

3 not connected

4 1PPS VALID I/O output/

input

Output:

internal pull-up resistor to 3.3V; output low = 1PPS valid; maximum input voltage = 8V; maximum sink current = 18mA; output low level <0.4V for 1.8 mA sink current

Input:

maximum input voltage = 8V; input low level (<0.8V) = 1 PPS valid

5 1PPS VALID IN input

active low (<0.8 V) = 1 PPS valid

input connection for VALID signal (from QS2 RSU);

internal pull-up resistor to 3.3V; maximum input voltage = 9V

6 GND ground

7 1PPS RS-485+ OUT

output/ input

1PPS RS-485 output (or input)

8 1PPS RS-485– OUT

a. The factory default is an output. Can be configured as an input using DIP switch 1 (refer to “DIP SWITCHES” on

page 22).

b. Can be configured to accept the pulsed signal from the QS

RSU with version 3.00.00.00 and later firmware (one

pulse per 10 seconds).

c. Compatible with the 1PPS VALID signal from the QS

RSU, whether it is steady or pulsed.

d. The factory default is an output, with the option of disabling when the GPS fix is deemed invalid. Can be config-

ured as an input using internal links (refer to “Setting the Links on the System Interface Board” on page 50). You cannot use the T801-4 to provide a 1PPS signal to the QS

RSU with v3 and later firmware. Although this port provides a 1PPS RS-485 output, the associated VALID signal (TTL steady state level) is not compatible with v3 firmware, which is designed for a pulsed VALID input. Refer to the RSU Service Manual for more information.

12345678

external view

22 Description T801-4 Installation and Operation Manual

DIP SWITCHES The DIP switches are used to change the configuration of the T801-4.

Some switches are used in combination with other switches, and some are used only in certain system configurations (these configurations are described in “System Configuration” on page 49).

The following table describes the function of each switch. The switches are on when in the up position.

Switch State Function

1on

enables the external 1PPS RS-485 input on PORT B (pins 7 and 8) configures the 1PPS VALID I/O signal line on PORT B as an input (pin 4)

off

disables the external 1PPS RS-485 input on PORT B (pins 7 and 8) enables the internal GPS receiver

on external GPS receiver on PORT A is selected

off internal GPS receiver or external 1PPS RS-485 input on

PORT B

is selected

on the 1 PPS RS-485 output PORT B is left running when the 1 PPS signal is invalid (i.e the 1 PPS

signal is not based on a valid GPS fix)

off the 1PPS RS-485 output

PORT B is disabled

when the 1PPS signal is invalid (i.e the 1 PPS

signal is not based on a valid GPS fix)

on the 1 PPS TTL outputs are left running when the 1 PPS signal is invalid (i.e the 1PPS signal

is not based on a valid GPS fix)

off the 1PPS TTL outputs are disabled

when the 1PPS signal is invalid (i.e the 1PPS signal is

not based on a valid GPS fix)

on enables a GPS receiver (1 PPS RS-485 input) changeover whenever GPS and /or oscillator

alarms occur

off disables the GPS receiver changeover

on GPS receiver (1PPS RS485 input) changeover triggered only by an oscillator alarm

off GPS receiver (1PPS RS485 input) changeover triggered by oscillator and/or GPS alarms

on enables the 1PPS VALID IN signal line (pin 5 of PORT B)

off disables the 1PPS VALID IN signal line (pin 5 of

PORT B)

8 on configures the 1PPS VALID IN and 1PPS VALID I/O input lines to accept steady state input

signals

off configures the 1PPS VALID IN and 1PPS VALID I/O input lines to accept pulsed input

signals (from the QS

RSU with version 3 and later firmware)

a. Set this switch on when the T801-4 is supplied by the 1PPS RS-485 input from the QS2 RSU.

b. Set this switch off when the internal GPS receiver is fitted (the 1PPS RS-485 input [PORT B] is disabled).

c. The GPS SELECTED LEDs to the right of the DIP switches indicate which 1PPS source is active.

d. When switch 1 is on.

e. The setting of DIP switches 3 and 4 will depend on which GPS receiver is used. Refer to “1PPS Outputs” on

page 33 for more information.

f. After the fault output delay period (refer to “Fault Output Delay” on page 33).

g. Set this switch on for a system configuration consisting of two 1PPS RS-485 inputs (with associated VALID lines)

from a system with dual GPS receiver QS

RSUs (refer to “T801-4 with Dual QS2 RSU Receivers” on page 65).

h. The options provided by switch 6 are available only when switch 5 is on.

DC INPUTS The DC input is not a floating input. The T801-4 is designed to accept an

input voltage of 10.5VDC to 28VDC with negative ground. There are two sets of inputs, which are diode-isolated from each other. This allows the connection of the primary power supply, as well as a back-up power supply (if required). Reverse polarity protection is also provided by a steering diode, which prevents operation until the correct polarity is applied. Overcurrent protection is provided by an electronic fuse, which triggers with an input greater than 5A (approximately). This fuse can be reset by disconnecting the DC power.

Use the provided connector to connect power to the 4-way DC input on the rear panel. This connector is a Phoenix Contact FKC series which uses a spring cage mechanism to clamp the wire. It also incorporates a test connection. When connecting the DC cables to this connector, proceed as follows:

1. Strip the insulation back 10mm.

Note Do not twist the strands of the conductor before clamping in the

connector. Observe the maximum wire gauges, as listed in the table below.

2. Raise the wire clamp by pushing the orange tab

b inwards with a

suitable tool (e.g. small flat blade screwdriver).

3. Insert the wire into the connector, and release the orange tab, clamping the conductor in place. Observe the correct polarity, as shown in the table below.

Conductor Type

Number of Conductors

Recommended Wire Gauge

Minimum Maximum

flexible (stranded) 1 0.2mm

/ 24AWG 2.5mm2 / 13AWG

solid 1 0.2mm

/ 24AWG 2.5mm2 / 13AWG

flexible with ferrule and plastic sleeve 1 0.25mm

/ 23AWG 2.5mm2 / 13AWG

flexible with ferrule, no plastic sleeve 1 0.25mm

/ 23AWG 2.5mm2 / 13AWG

two conductors with the same cross-section, stranded, twin ferrules with plastic sleeve

20.5mm

/ 20AWG 1mm2 / 17AWG

++–

–

viewed from cable-entry side

external view

+–

–

DC input on rear panel connector

24 Description T801-4 Installation and Operation Manual

POWER LED This green LED is lit when the internal DC supply is active (on).

GPS SELECTED LED PORT A

This yellow LED is lit when the external GPS receiver on PORT A is selected.

GPS SELECTED LED INT/PORT B

This yellow LED is lit when either the internal GPS receiver, or the external GPS receiver on

PORT B is selected. The default setting for this LED is to

indicate whether the internal GPS receiver (if fitted) has been selected. It can be configured to indicate the status of an external GPS receiver connected to

PORT B by using the DIP switches and internal links (refer to

“Setting the Links on the System Interface Board” on page 50).

1PPS VALID LED This green LED is lit when the 1PPS input to the T801-4 from the selected

GPS receiver is valid.

1PPS TTL OUTPUTS These four BNC connectors provide 1PPS outputs at TTL levels. They

have low output impedance, and the output drive is designed to drive a 50Ω load.

When these outputs are used with a load, each output must be terminated with a 50Ω termination, otherwise reflections of the 1PPS pulse may occur. When the outputs are not used, they should be left un-terminated.

When the outputs are used to drive the 1PPS input on TB9100 system interface ports, up to six of these ports can be daisy-chained from a single output (as shown in Figure 1.5 on page 25). The maximum overall cable length in this situation is 30 metres.

If loads are to be daisy-chained, we recommend that the cable length between the first and last load is kept to a minimum. This will reduce any 1PPS propagation variation between base stations. The propagation of the 1PPS pulse is delayed by ≈5 ns for every metre of 50Ω coaxial cable used.

The DIP switches on the rear panel provide the option of disabling these 1PPS outputs when the GPS fix is deemed invalid.

Ground Connector A threaded M5 chassis ground connector is provided on the rear panel. This

stud allows the connection of a ground cable terminated with a “ring” terminal.

Figure 1.5 Connecting one 1PPS TTL output to multiple TB9100 base stations

the longest length of cable must be between the T801-4 and the first TB9100

use short lengths of cable between each TB9100

50Ω termination

maximum of six TB9100 loads on one 1PPS TTL output

T801-4 - rear view TB9100 - rear view

1PPS TTL output

26 Description T801-4 Installation and Operation Manual

1.4 Back-up Battery

A 3V lithium battery (type CR2032) provides back-up power for the optional internal GPS receiver. The battery provides back-up power to keep the module’s RAM alive and to power the real-time clock when the receiver’s prime power is turned off. RAM is used to store the GPS almanac, ephemeris and last position.

Note Configuration data programmed at the factory is stored in non-

volatile flash memory which does not require back-up power.

Although battery back-up power is not essential, using it can reduce the time to acquire the first GPS fix:

■ hot start less than 20 seconds (typical)

■ warm start less than 45 seconds (typical).

Without battery back-up power, the GPS receiver, upon power-up, has no memory of previous navigation data and must perform a cold start. In this case the typical time to acquire a fix is less than two minutes. For more information refer to “GPS Fix Acquisition Times” on page 31.

Battery Life The lithium battery may last for up to two years, depending on how often

the GPS receiver loses prime power. However, we recommend that you check the voltage output of the battery every year. The voltage must be higher than 2.5V.

Replacing the Battery

Follow ESD precautions during this procedure. Refer to “ESD

Precautions” on page 75.

1. Disconnect the power supply from the T801-4.

2. Remove the top cover.

3. Lift the edge of the battery with a thumb or finger.

4. Grip the raised edge of the battery with long-nosed pliers and slide it out of the holder.

5. Slide the new battery into the holder with the positive pole (+) facing up.

6. Refit the top cover and reconnect the power.

2 Operation

This chapter describes the basic operation of the T801-4. It provides information on the following topics:

■ applying power

■ what happens when power is lost

■ the use of UTC pulses (1 PPS) as a stable reference source

■ what happens when the GPS reference is valid or invalid

■ how the ageing correction process works

■ how the GPS fix acquisition time may vary

■ the different types of alarm that the T801-4 may generate

■ the availability of the T801-4 1PPS outputs with different GPS receivers.

+ 63 hidden pages

Tait TB8100, TB9100, T801-4 Installation And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual