Thrane&Thrane TT-3020B Product manual

TT-3020B
Maritime
Capsat Transceiver
for the
Inmarsat-C Network
Technical Reference Manual
Version 2.20
© Copyright Thrane & Thrane A/S June 1995
Tobaksvejen 23, DK-2860 Soeborg. Denmark

Information in this document is subject to change without notice and does not represent a commitment on the part of Thrane &
Thrane A/S.
© 1995 Thrane & Thrane A/S. All right reserved. Printed in Denmark.
Document Number TT-99-103373-220. Release Date: 19JUN95

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
19JUN95 Page i
Table of Contents
1. Introduction 1
2. The Maritime facilities 2
2.1 Scanning and Login 2
2.2 Distress 2
2.3 Link Test 2
2.4 Message transmission 3
2.5 EGC message reception 3
3. System Generation 4
3.1 The system generation menu 4
3.2 Entering your mobile number 5
3.3 Initialising system parameters 5
3.3.1 Write protection 6
4. Built-in GPS 8
4.1 Introduction to the GPS System 8
4.1.1 The basic idea - Satellite ranging 8
4.2 The GPS module 10
4.2.1 Feature list 10
4.3 Satellite Navigation 12
4.3.1 Four Satellite Navigation (3D) 12
4.3.2 Three Satellite Navigation (2D) 12
4.3.2.1 Constant Altitude with Unknown Value 13
4.3.2.2 Constant Altitude with Known Value 13
4.3.2.3 Variable Altitude with Known Values 13
4.3.3 Basic Modes of Three SV Navigation 13
4.3.3.1 Auto Hold Mode 13
4.3.3.2 Amended Hold Mode 14
4.3.4 Almanac 14
4.3.5 Error Outputs 14
5. Antenna switch 17
5.1 Introduction 17
5.2 Commands 18
5.2.1 Timer 1 18
5.2.2 Timer 2 18
5.2.3 Nominal Threshold 19
5.2.4 Minimum Threshold 19
5.2.5 Scanning 19
5.2.6 Fixed antenna 20
5.2.7 Remote unit list 20

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
Page ii 19JUN95
5.3 Status information 21
6. Using a Reader/Puncher in the Capsat system 22
6.1 Introduction 22
6.2 Connections and setup 22
6.3 TT-1610A High speed Reader/Puncher 22
6.4 Receiving and punching messages 24
6.4.1 Setup of reception 24
6.4.2 Punching paper tape messages 25
6.4.3 Punching tapes in binary mode 25
6.5 Reading and transmitting messages 26
6.5.1 Reading paper tape messages 26
6.5.2 Reading tapes in binary mode 27
6.5.3 Transmitting messages 27
7. Transceiver Software Details 28
7.1 EGC Message header format 28
7.2 Provider Name Mapping 30
7.2.1 Introduction 30
7.2.2 Map technique 30
7.3 Baudot Characters 32
7.4 Use of the Transceiver built-in speaker 33
7.5 T-Bus Software Interface Description 35
7.5.1 TT-3042A and TT-3042B Remote Alarm 35
7.5.1.1 Introduction 35
7.5.1.2 Status command 36
7.5.1.3 Print command 37
7.5.1.4 Msg_info command 37
7.5.1.5 Send_nmea command 38
7.5.1.6 Position command 38
7.5.1.7 Time command 39
7.5.2 Antenna Switch 40
7.5.2.1 Introduction 40
7.5.2.2 Status Poll 40
7.5.2.3 Switch Antenna 40
8. Capsat Transceiver Service 41
8.1 Service 41
8.1.1 CPU board: TT 37-102819 41
8.1.2 Power supply: TT 37-102120 43
8.1.3 Demodulator / down converter board: TT 37-102019 44
8.1.4 Built-in GPS Module: TT 88-300421 45
8.1.4.1 Test Summary Word 45
8.2 Replacements 46
8.2.1 How to replace a CPU board: TT 37-102819 46
8.2.2 How to replace an FGU board: TT 37-100522 46
8.2.3 How to replace a demodulator board: TT 37-102019 46
8.2.4 How to replace a power supply: TT 37-102120 47
8.2.5 How to replace an antenna unit: TT 69-102881 47
8.2.6 How to replace the Built-in GPS Module: TT 88-300421 47

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
19JUN95 Page iii
8.3 The TT-3020B status screen information 48
8.3.1 Hardware information 48
8.3.1.1 Synth's 49
8.3.1.2 LO 1/2 49
8.3.1.3 Corr.A/C/R 49
8.3.1.4 Dif/Temp 49
8.3.1.5 RX/TX/AGC/FIFO 50
8.3.1.6 R/C-B/B/S 50
8.3.2 Software information 51
8.3.2.1 Synchronisation 51
8.3.2.2 Logged in 51
8.3.2.3 TDM type 52
8.3.2.4 TDM channel number 52
8.3.2.5 Current channel 52
8.3.2.6 Current protocol 52
8.3.2.7 TDM origin 53
8.3.2.8 TDM frame number 53
8.3.2.9 BB error rate 53
8.3.2.10 Serial number 53
8.3.2.11 Mobile number 53
8.3.2.12 Preferred ocean 53
8.3.2.13 Activities in queue 53
8.3.3 Printing the information 54
8.3.4 Storing the information in a file for transmission 54
9. Handling of communication-error situations 55
9.1 No synchronisation 55
9.2 Protocol errors 56
9.2.1 List of Link Error Messages 57
9.2.1.1 LES messages in case of a pending or rejected call 57
9.2.1.2 LES messages in case of an aborted call 58
9.2.1.3 Transceiver Messages 58
9.3 Login impossible 61
9.4 Tuning fails 62

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
19JUN95 Page 1
1. Introduction
This manual explains some of the details of a model TT-3020B Maritime Capsat Transceiver and provides
instructions for using non-standard equipment together with the Transceiver and servicing and testing the
Transceiver.

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
Page 219JUN95
2. The Maritime facilities
2.1 Scanning and Login
The unique Maritime features are:
Automatic scanning every 24 hours of the preferred ocean region.
Automatic scanning at a BBER of 80.
Automatic scanning when turning on an uncommissioned Transceiver.
The Maritime version scans the preferred ocean (or all oceans) every 24 hours to keep the Transceiver tuned to the
strongest NCS signal as your Transceiver position is changed.
The bulletin board error rate BBER is an indication of the satellite link quality. The Maritime version starts a scan
when this value exceeds 80 (after 80*8.64 seconds = 11.5 minutes).
When turning on the power of an uncommissioned Transceiver the Maritime version will start a scan and then start a
login, if the unit is not logged in.
2.2 Distress
When in the Maritime mode the user can send a distress alert to an LES by means of the Message Handling Program
distress menu, by pressing the TT-3020B Set and Alarm front panel buttons or when using the TT-3042B Remote
Alarm, by pressing the Alarm button here.
2.3 Link Test
A manual distress alert test is possible.
The Maritime Transceiver will ask the user during a Link Test (Performance Verification Test) to manually send a
test distress alert.
If the request is ignored the Transceiver will automatically send the Distress Test after 2 minutes.

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
19JUN95 Page 3
2.4 Message transmission
The Maritime Transceiver will allow you to send your text messages with distress priority in case of an emergency.
Such messages will be routed to a default destination that is pre-programmed in the LES. This destination is
normally the Search And Rescue (SAR) authority in the country where the LES is located.
2.5 EGC message reception
EGC System and SafetyNet calls can not be turned off.

Thrane & Thrane
TT-3020B Capsat Transceiver
Technical Reference Manual
Page 419JUN95
3. System Generation
The procedure is as follows:
1. Turn on your Transceiver while you press the Set button. You must depress the button for at least 10 seconds or
at least until you can hear the connected printer being initialised.
2. Now hit the ENTER key and watch the System Generation menu appear on your screen. If this does not happen,
repeat steps 1 and 2.
3.1 The system generation menu
Having followed the instructions in the previous section you should now see the menu on your screen:
Thrane & Thrane system generation menu: Capsat Transceiver
0 Quit
1 Init system parameters
2 EGC settings
3 Filerouting
4 Reporting service
5 NCS Table
6 Preferred ocean
7 Console settings
8 Mobile Number
Enter number >
To perform an action on the list you just type in the appropriate number. If you want to see the menu again just type
CTRL+C (Hold the CTRL key down while typing a C).
The CTRL+C combination also acts as a Cancel facility. It will always bring you back to the menu without
changing any parameters.
Note: Do not hit the ESC key if you use the Thrane & Thrane Message Handling Program. If you hit the ESC
key you will go back to the menu of the Message Handling Program and an error will occur as the
Transceiver will not respond to the normal commands while in the System Generation.
If you do hit ESC, then turn off both units and proceed as in section 3on page 4.