Tait TB8100 User manual

TB8100 base station
TB9100 base station
T801-4 GPS Frequency Reference
Installation and Operation Manual
MBA-00033-01
Issue 1
September 2007

2T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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 s i t e: www.taitworld.com
Technical Support
For assistance with specific technical issues, contact
Technical Support:
E-mail: [email protected]
We b s i t e: www.taitworld.com/technical
Copyright and Trademarks
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, NZ509242,
NZ509640, NZ509959, NZ510496, NZ511155,
NZ511421, NZ516280/519742, NZ519118,
NZ519344, NZ520650/537902, NZ522236,
NZ524369, NZ524378, NZ524509, NZ524537,
NZ524630, NZ530819, NZ534475, NZ534692,
NZ535471, NZ536945, NZ537434, NZ546295,
NZ547713, NZ521450, AU2003281447,
AU2002235062, AU2004216984, AU2005207405,
CA2439018, CA2554213, EU03784706.8,
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

4T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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 QS2RSU Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.6 T801-4 with Dual QS2RSU 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 QS2RSU . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 4.6 Connecting the T801-4 to dual QS2RSU receivers . . . . . . . . . . . . . . . . . . . . 66
Figure 5.1 Typical antistatic bench set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Figure 5.2 Chassis mounting points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

6T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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

8T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
Publication Record
PPM Parts Per Million
PPS Pulse Per Second
QS2TaitNet QS2simulcast 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
© Tait Electronics Limited September 2007
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 QS2). It is based on the Dalman
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/
receiver1, 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
J1
SMB2
SMB3
SMB4
SMB1
JP1 JP3
Satsync 7
Module 2
(optional)
Front Panel
Board 2
CON1
J101
J100
J2
J1
Front Panel
Board 1
J1
DC-DC
Converter 1
J1
J206
SMA
J205
DC-DC
Converter 2
J2
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
2
DC Inputs
Programming Port
Module 1
Programming Port
Module 2

12 Description T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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
bSatsync 7 module 1 (standard) iDC input filter
cSatsync 7 module 2 (optional) jsystem interface board
dfront panel 1) chassis
efront panel board for Satsync 7 module 2 1! rear panel connector board
ffront panel board for Satsync 7 module 1 1@ 3V battery for optional internal GPS receiver
(refer to “Back-up Battery” on page 26)
gDC converter for Satsync 7 module 2 1# optional internal GPS receiver
hDC converter for Satsync 7 module 1
b
cd
e
f
g
h
j
1)
1@
1!
1#
i

14 Description T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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 TBA0P101cable 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
bprogramming port dmaster oscillator status LED
cGPS status LED
bcd bcd
Satsync 7 module 1 Satsync 7 module 2
b
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
hj
b
gi
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 108(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 108level. 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 108.
■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 108
■the 1PPS signal is invalid and the level of accuracy has not yet
reached a level of ±1 part in 108(usually after initial power-up).
c
d

16 Description T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
1.3.2 Rear Panel
Figure 1.4 Connections and controls on the rear panel
bfrequency reference outputs from Satsync 7
module 1
iDC inputs
cfrequency reference outputs from Satsync 7
module 2
jpower LED
dRF input from GPS antenna 1) GPS receiver LED: PORT A GPS receiver selected
eI/O port 1! GPS receiver LED: PORT B or internal GPS
receiver selected
fRS-485 interface to external GPS receiver
(PORT A)
1@ 1PPS valid LED
g1PPS RS-485 interface to QS2RSU
(PORT B)
1# 1PPS TTL outputs
hDIP switches 1$ ground connector
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1! j 1#
1$ 1@

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 50Ωtermination.
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 ×109(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 ×107(±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) ±0.1ppm
- 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 50Ωfemale 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
d

18 Description T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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.
e

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 (<0.8V) 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
hj
b
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external view

20 Description T801-4 Installation and Operation Manual
© Tait Electronics Limited September 2007
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).
This port is generally referred to as “PORT A” in the rest of this manual. The
pin allocations for this port are described in detail in the following table.
f
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 QS2RSU);
internal 10kΩpull-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
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