ProTelevision PT 5780 User manual

ProTelevision Technologies A/S
Marielundvej 16
DK-2730 Herlev
Denmark
PT 5780
DVB-T Modulator (ASIC)
Instruction Manual

Trade Mark of the DVB Digital Video Broadcasting Project
PROTELEVISION technologies
An ISO 9001 Certified Company
PT 5780 DVB-T Modulator, Instruction Manual: Total number of pages: 95
Copyright 2003 ProTelevision Technologies A/S, Denmark
All Rights Reserved
Printed in Denmark 2003-08-25
Revision: 3.11
Publication number: 9499 493 12611

PT 5780 DVB-T Modulator ProTelevision Technologies Contents
Instruction Manual Revision 3.11
i
Contents
1SAFETY..................................................................................................................1-1
1.1 INTRODUCTION........................................................................................................1-1
1.2 SAFETY PRECAUTIONS .............................................................................................1-1
1.3 CAUTION AND WARNING STATEMENTS ........................................................................1-1
1.4 IMPAIRED SAFETY PROTECTION .................................................................................1-2
1.4.1 Technical Specifications ..............................................................................1-2
1.4.2 Equipment Ratings ......................................................................................1-3
1.5 ELECTROSTATIC SENSITIVE DEVICES ..........................................................................1-3
1.6 SYMBOLS...............................................................................................................1-4
2INTRODUCTION AND APPLICATIONS...........................................................2-1
2.1 APPLICATIONS.........................................................................................................2-1
2.1.1 Block Diagram (PT 5780 features)................................................................2-3
2.2 TRANSMISSION MODES SUPPORTED...........................................................................2-3
2.3 TRANSPORT STREAM INPUTS.....................................................................................2-4
2.4 ALARM CIRCUITS.....................................................................................................2-6
2.5 OPERATION............................................................................................................2-6
2.6 FREQUENCY REFERENCES ........................................................................................2-6
2.7 TEST FACILITIES ......................................................................................................2-7
3INSTALLATION.....................................................................................................3-1
3.1 INITIAL INSPECTION..................................................................................................3-1
3.2 SAFETY INSTRUCTION ..............................................................................................3-1
3.2.1 Earthing......................................................................................................3-1
3.3 MAINS VOLTAGE CORD AND FUSES ............................................................................3-1
3.4 RACK MOUNTING.....................................................................................................3-2
3.5 CLEANING ..............................................................................................................3-2
3.6 CONFIGURATION......................................................................................................3-3
3.6.1 Wiring schemes for RS 232 (handshake not implemented) ............................3-3
3.6.2 Alarms........................................................................................................3-3
3.6.3 Mute...........................................................................................................3-4
3.6.4 Reset .........................................................................................................3-4
3.7 ACCESS TO AND REPLACEMENT OF PARTS ..................................................................3-4
3.7.1 Safety.........................................................................................................3-4
3.7.2 Access to the Units......................................................................................3-4
4OPERATING INSTRUCTIONS...........................................................................4-1
4.1 FRONT PANEL .........................................................................................................4-1
4.1.1 Front Panel Indicators..................................................................................4-1
4.1.2 Front Panel Controls (The menu system)......................................................4-1
4.1.3 Front Panel Display .....................................................................................4-3
4.2 REAR PANEL...........................................................................................................4-3
4.2.1 Rear Panel Connections ..............................................................................4-3
4.3 MENU SYSTEM –DESCRIPTION AND OPERATION..........................................................4-5
4.3.1 Power Up ...................................................................................................4-5
4.3.2 Operating Menu System Chart .....................................................................4-6
4.3.3 Status Menu System ...................................................................................4-6
4.3.3.1 Description of Status Display Windows...........................................4-7

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4.3.4 Configuration Menu System.......................................................................4-11
4.3.4.1 Top-level configuration menu access............................................4-12
4.3.4.2 Context sensitive menu access....................................................4-13
4.3.4.3 TRANSMISSION Menu System (Menu ID 1000) ...........................4-14
4.3.4.4 SIGNAL Menu System (Menu ID 2000)........................................4-15
4.3.4.5 ALARM Menu System (Menu ID 3000).........................................4-18
4.3.4.6 PRESET Menu System (Menu ID 4000) .......................................4-22
4.3.4.7 CONFIGURE Menu System (Menu ID 5000) ................................4-22
4.3.4.8 TESTSIGNAL Menu System (Menu ID 6000)...............................4-24
4.3.4.9 RECEPTION Menu System (Menu ID 7000) .................................4-25
4.3.4.10 EVENT LOG Menu System (Menu ID 8000) .................................4-27
4.3.5 Configuring Parameters .............................................................................4-27
4.3.5.1 Selection from Enumerated Values ..............................................4-27
4.3.5.2 Editing of Numerical Values .........................................................4-28
4.3.5.3 Editing of Text.............................................................................4-29
4.3.5.4 Editing of Percentage Values .......................................................4-30
4.4 FACTORY RESET ...................................................................................................4-30
4.5 SFN MODE OF OPERATION.....................................................................................4-31
4.6 FATAL ALARMS......................................................................................................4-32
4.6.1 Modulator Board Controller Not Responding...............................................4-32
4.6.2 Instrument Too Hot....................................................................................4-32
4.7 ERROR HANDLING AND CODES ................................................................................4-32
5REMOTE INTERFACE.........................................................................................5-1
5.1 GENERAL DESCRIPTION............................................................................................5-1
5.2 GENERAL DESCRIPTION OF THE INTERFACE SYNTAX.....................................................5-1
5.2.1 General Information.....................................................................................5-1
5.2.2 Syntax of Program Messages ......................................................................5-2
5.2.3 Syntax of Response Messages ....................................................................5-2
5.2.4 Long and Short Form...................................................................................5-3
5.2.5 Syntax Elements.........................................................................................5-3
6RS232 COMMUNICATION..................................................................................6-1
6.1 REFERENCES..........................................................................................................6-1
6.2 COMMANDS EXPLANATION........................................................................................6-1
6.2.1 Mandated Commands .................................................................................6-1
6.2.2 Required Commands...................................................................................6-2
6.2.2.1 SYSTem commands .....................................................................6-2
6.2.2.2 STATus commands.......................................................................6-2
6.2.3 Instrument Commands ................................................................................6-3
6.2.3.1 DIAGnostic commands..................................................................6-3
6.2.3.2 SYSTem commands .....................................................................6-3
6.2.3.3 USER commands .........................................................................6-5
6.2.3.4 DISPlay commands.......................................................................6-6
6.2.3.5 INPut commands ..........................................................................6-6
6.2.3.6 OUTPut commands.......................................................................6-8
6.2.3.7 MONitor command......................................................................6-13
6.2.3.8 PRECorrect (Nonlinear Pre-corrector) commands .........................6-13
6.2.3.9 LPRecorrect (Linear Pre-corrector) commands .............................6-17
6.2.3.10 SFN commands ..........................................................................6-18
6.2.3.11 ALARM commands .....................................................................6-20
6.2.3.12 EVENT commands......................................................................6-23

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6.2.3.13 TEST commands ........................................................................6-23
6.2.3.14 FACTORY commands.................................................................6-24
6.3 COMMANDS SUMMARY ...........................................................................................6-25
6.3.1 Mandated Commands ...............................................................................6-25
6.3.2 Required commands .................................................................................6-25
6.3.2.1 SYSTem subsystem....................................................................6-25
6.3.2.2 STATus subsystem.....................................................................6-25
6.3.3 Instrument commands ...............................................................................6-26
6.3.3.1 DIAGnostic subsystem................................................................6-26
6.3.3.2 SYSTem subsystem....................................................................6-26
6.3.3.3 USER subsystem........................................................................6-26
6.3.3.4 DISPlay subsystem.....................................................................6-26
6.3.3.5 INPut subsystem.........................................................................6-27
6.3.3.6 OUTPut subsystem.....................................................................6-27
6.3.3.7 MONitor subsystem.....................................................................6-29
6.3.3.8 PRECorrect (Nonlinear Pre-corrector) subsystem .........................6-29
6.3.3.9 LPRecorrect (Linear Pre-corrector) subsystem..............................6-29
6.3.3.10 SFN subsystem ..........................................................................6-30
6.3.3.11 ALARm subsystem......................................................................6-30
6.3.3.12 EVENt subsystem.......................................................................6-31
6.3.3.13 TEST subsystem ........................................................................6-31
6.3.3.14 FACTory subsystem....................................................................6-31
6.4 ERROR CODES......................................................................................................6-32
6.4.1 Command errors [-199, -100] .....................................................................6-32
6.4.2 Execution errors [-299, -200] ......................................................................6-33
6.4.3 Device specific errors [-399, -300] ..............................................................6-34
6.4.4 Query errors [-499, -400] ...........................................................................6-34
6.4.5 Device specific errors [1, 32468] ................................................................6-34
APPENDIX A…...........................................................................................….A-1
APPENDIX B………………………………………………………………………..A-2

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PT 5780 DVB-T Modulator ProTelevision Technologies Safety
Instruction Manual Revision 3.11
1-1
1Safety
Read this chapter carefully before installation and use of the instrument.
1.1 Introduction
The instrument described in this manual has been designed for use by properly trained
personnel only.
Adjustment, maintenance and repair of the exposed equipment should only be carried out by
qualified personnel who are aware of hazards involved.
1.2 Safety Precautions
For the correct and safe use of the instrument, it is essential that both operating and servicing
personnel follow generally accepted safety procedures in addition to the safety precautions
specified in this manual. Specific warning and caution statements, where applicable, are found
throughout this manual. Note that warning and caution statements and/or symbols are marked
on the instrument as well.
This manual provides technical information important for safe operation of the equipment.
Please refer to the relevant sections of the manual for technical specifications, installation and
operating instructions.
Special attention must be paid to the following issues:
♦Protective earthing of the instrument is required for the accessible terminals to be safe.
(IEC 1010-1 Safety class I instrument)
♦The actual environmental conditions must be checked against the specification
♦Mains voltage must be inside the specified range
The opening of covers or removal of parts, except those to which access can be gained by
hand, is liable to expose live parts and terminals.
If adjustment, maintenance, or repair of the opened instrument is unavoidable, it must only be
carried out by a skilled person who is aware of the hazards involved.
1.3 Caution and Warning Statements
Caution
Used to indicate correct operation or maintenance in order to prevent damage to, or destruction
of equipment or other property.
Warning
Used to indicate a potential hazard that requires correct procedures or practices in order to
prevent personal injury.

Safety ProTelevision Technologies PT 5780 DVB-T Modulator
Instruction Manual Revision 3.111-2
1.4 Impaired Safety Protection
1.4.1 Technical Specifications
This manual provides technical information important for safe operation of the equipment.
Please refer to the Chapter Product Data for information regarding technical specifications and
the Chapter Installation and Operating Instructions regarding instructions for use.
Technical assistance may be obtained from your local ProTelevision Technologiescustomer
support organization or from:
ProTelevision Technologies
Marielundvej 16
DK-2730 Skovlunde
Denmark
Phone : [phone]
Fax : [phone]
E-Mail : [email protected]
Website : http://www.protelevision.com

PT 5780 DVB-T Modulator ProTelevision Technologies Safety
Instruction Manual Revision 3.11
1-3
1.4.2 Equipment Ratings
The instrument can be used with a mains voltage supply of:
Voltage range:
90 –132VAC / 180 -250 V AC
Frequency:
47 -63 Hz
The power consumption:
Does not exceed 50 VA
The instrument is designed for the following environmental conditions:
♦Indoor use
♦Altitudes up to 2000 m
♦Temperatures between 5oC and 40oC
Maximum relative humidity of 80% for temperatures up to 31oC, decreasing linearly to 50%
relative humidity at 40oC.
The instrument is equipped with a number of input and output terminals as described in the
Chapter Product Data.
The terminals are protected from becoming hazardous live by means of basic insulation and
protective screening.
Whenever it is likely that safe operation is impaired, the instrument must be made inoperative
and secured against unintended operation. The appropriate servicing authority must be
informed.
For example, safety is likely to be impaired if the instrument fails to perform the intended
measurements or shows visible damage.
WARNING: Protection provided by the equipment may be impaired, if the equipment is used in
a manner not specified by this manual.
ATTENTION
1.5 Electrostatic Sensitive Devices
All ICs and many other semi-conductors are susceptible to electrostatic discharges ESD).
Careless handling during repair can reduce lifetime drastically.
When repairing, make sure that you are connected to the same potential as the mass of the set
via a wrist wrap with resistance. Keep components and tools also at this potential.

Safety ProTelevision Technologies PT 5780 DVB-T Modulator
Instruction Manual Revision 3.111-4
1.6 Symbols
Symbol Colour: Explanation:
Red High voltage terminal: a terminal at which a voltage, with
respect to another terminal or parts exists or may be
adjusted to 1000 V or more. (High voltage > 1000 V).
Black/Yellow Live part shock risk of electric shock.
Black/Yellow To preserve the instrument from damage the operator
must refer to an explanation in the instruction manual.
White/Black Protective earth (grounding) terminal.
~
Black Alternating current (placed on the identification plate).
White/Black
Off (supply -mains switch).
On (supply -mains switch).

PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications
Instruction Manual Revision 3.11
2-1
2Introduction and Applications
Designed to meet the most demanding requirements of today’s Digital Terrestrial Television
Broadcast Market, the DVB-T Modulator PT 5780 from ProTelevision Technologies is ranked
number one in its class. A key factor in the products success is the quality of the coding and
modulation process. The unit is furthermore highly flexible and therefore easily tailored to
provide the exact features required in a specific application. This means that you will only have
to pay for the functional features that you need. Retrofitting of features is easy. Normally, the
retrofitting only involves uploading new firmware and software by means of a standard PC.
.
2.1 Applications
The performance and flexibility of the PT 5780 allows it to excel in any application related to
DVB-T modulation. Being a DVB-T modulator the core function of the PT 5780 is to modulate
an MPEG-2 transport stream (input) onto a DVB-T compliant COFDM spectrum (output) in
accordance with the rules for channels coding and modulation specified in the DVB-T standard
ETSI EN 300 744.
Basic version
The basic version of the PT 5780 delivers the COFDM spectrum on a user-defined frequency
between 35 and 37 MHz. The default polarity of the spectrum is ‘Inverted’ as normal for a DVB-
T IF signal. However, the user can freely switch the polarity to ‘non-inverted’ if required. The
spectrum bandwidth may be user configured to 8 or 7MHz as required. This flexibility will allow
the user to interface the IF signal to a wide range of transmitters and frequency converters.
The basic unit has two MPEG-2 inputs (ASI format). Switching between the two inputs can be
done manually and automatically. The latter option provides near seamless switching to a
secondary transport stream in case the primary transport stream source fails (a truly valuable
feature for broadcast applications.)
The user can configure the basic version to any transmission mode listed in ETSI EN 300 744
(excluding hierarchical mode and SFN mode.)
Optional features
A broad range of optional features allows tailoring the modulator for the specific application.
If the output COFDM spectrum is required on a frequency not covered by the basic version (35-
37MHz) the RF Converter option PT 8715 is the answer. This high performance converter
covers the entire frequency range from 30MHz to 1GHz in steps of just 1Hz. The user can freely
set the polarity of the spectrum to inverted or Non-inverted as required. With this converter the
PT 5780 will cover any spectrum application and frequency requirement that you will come
across in the field of DVB-T.
To upgrade the PT 5780 for SFN transmission you will only need to add the SFN option PT
8732. This option provides the PT 5780 with market leading SFN performance with respect to
basic timing accuracy and extent of the local delay offset range. Also, even when the SFN
option is installed you can still select MFN mode via the front panel controls. A convenient
feature when conducting pre-testing and alignment of RF parameters on transmitter installations
before the timing references and transport stream with MIP are in place (as a general rule SFN
modulators must mute the output if either of these signals is absent).

Introduction and Applications ProTelevision Technologies PT 5780 DVB-T Modulator
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To extend the standard range of transmission modes to include support of hierarchical
modulation the Hierarchical Modulation option PT 8733 must be added. Hierarchical
modulation allows simultaneous transmission of two MPEG-2 transport streams. The
compromise between data rate and ruggedness can be set differently between the two virtual
channels. For example:
•a highly protected channel for transmission to mobile and/or portable receivers and
•a high capacity channel, at the expense of ruggedness, for transmission to rooftop
antennas.
Another typical application is simulcasting of the same program in high definition resolution and
standard definition resolution. A significant benefit of hierarchical modulation is that the total
data-rate available in a system with two hierarchically modulated RF channels is higher than
what is available for a two-channel non-hierarchical system where one RF channel is strictly
dedicated to mobile/portable receivers and the other RF channel is strictly dedicated for
transmission to rooftop antennas.
The hierarchical option itself is often supplemented by adding also an extra set of ASI inputs
(dual input option PT 8716) thereby upping the total to four ASI inputs. Access to four ASI
inputs will preserve the possibility also in hierarchical mode to switch almost seamlessly to a
secondary transport stream source in case the primary transport stream source fails (HP
primary input, HP secondary input, LP primary input, LP secondary input).
By adding the 6MHz BW option PT 8735 the PT 5780 will, in addition to the standard 8 and 7
MHz BW, also support transmission in the 6MHz bandwidth mode that is intended for
applications in North and South America, Korea, Japan and elsewhere where 6MHz channel
raster is standard. Including this option for T&M and R&D applications is also highly attractive
as the user simply executes the switching between the three bandwidths via the instrument front
panel (one instrument covers all bandwidths defined by the ETS for DVB-T transmission).
To maximise the performance of the transmitter in which the modulator is installed the Digital
Linear and Non-linear Pre-corrector PT 8731 option is recommended. The Non-linear pre-
corrector balances out gain and phase non-linearity in the transmitter RF power amplifier
thereby reducing significantly the in-band as well as out of band intermodulation generated by
the amplifier. This optimisation of the performance will extend the transmitters coverage area
and ease the performance requirement from the transmitter output filter used for suppressing
the radiation in adjacent channels below the maximum allowed level. The linear pre-corrector
balances out level and group delay variations over the channel bandwidth caused by the
transmitter antenna filter and/or channel combiner filers. The linear optimisation of the signal
radiated from the transmitter means that the channel equalizer of the DVB-T receiver may focus
all its correction capacity on level and group delay errors originating from the actual
transmission path. The characteristics of the linear and non-linear pre-correction curves are set
by means of an easy to use and highly intuitive graphical user interface, the IMD Buster
software package (Windows compatible).
Two options for remote control of the PT 5780 exist. The WebLink option PT 8717 allows
remote control of the PT 5780 via Ethernet (TCP/IP). The system is based on a Web server
mounted inside the PT 5780. The Web pages stored on the Web server are designed as a
complete graphical user interface (GUI) for testing the status and setting the parameters of the
modulator. The WebLink concept is popular because remote control with this system only
requires a standard PC with a network interface card (NIC) and a Web browser (Microsoft
Explorer 5.0). The SNMP client option PT 8727 allows remote control of the PT 5780 in

PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications
Instruction Manual Revision 3.11
2-3
accordance with the SNMP protocol (Get, Set and SNMP traps). This remote control option is
intended for systems solutions where it is desired to integrate the control of a range of (SNMP
compliant) equipment in a common management system, the SNMP manager. The
management system must be adapted/designed to the specific systems requirements and it is
therefore not included with the supplied SNMP client option.
2.1.1 Block Diagram (PT 5780 features)
Rev3.023.01.2003 u/5780/work/hso/manual V3/drawings/5788 block diagram (features).vsd
COFDM
modulator
(8+7MHz BW,
MFN)
OPTION PT 8715
RF converter
(RF
30-
1000
MHz)
ASI input-A
IFmonitoring
36 MHz
MPEG-2 TS
DVB-T Modulator
PT 5780
ASI input-B
TS source selector
HP
LP
RS232 for SCPI
control
or
Optionally RJ45
for Ethernet
RS232 for SCPI
control
OPTION PT 8717
WebLink for Web
browser control OPTION PT 8727
SNMP Client
OPTION PT 8731
Digital Linear
and
Non-linear
Pre-correction
System controller
(Local and remote)
OPTION
PT 8732
SFN Support
OPTION
PT 8733
Hierarchical
modulation
OPTION
PT 8735
8-7-6 MHz BW
OPTION PT 8720
Precision TCXO
0.01ppm
IF
35-
37
MHz
OPTION PT 8723
SPI LVDS input
2.2 Transmission Modes Supported
♦MFN mode and SFN mode (SFN requires option PT 8732)
♦6, 7, 8 MHz (6MHz requires option PT 8735)
♦FFT size: 2k or 8k
♦Guard Interval: 1/4, 1/8, 1/16, and 1/32
♦Code Rates: 1/2, 2/3, 3/4, 5/6, and 7/8
♦Modulation Constellations: QPSK (4 QAM), 16 QAM, and 64 QAM
♦Hierarchical α1, 2, 4 (hierarchical mode requires option PT 8733)

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2.3 Transport Stream Inputs
The standard version of the PT 5780 DVB-T modulator is provided with two serial (ASI) inputs.
By non-hierarchical mode the active input is selected either via the front panel or the remote
control. By hierarchical mode one input is assigned to the high priority stream and the other
input is assigned to the low priority stream. The inputs accept an MPEG transport stream
according to the DVB recommendation. Both 188 and 204 byte transport packets are supported
(in the 204 byte mode the last 16 bytes are always overwritten by the Reed-Solomon
redundancy data generated by the modulator). The available data rate for transmission is stated
in the tables below in accordance with the selected constellation, code rate and guard interval.
Please notice that separate tables applies to 8MHz , 7MHz, and 6MHz bandwidth respectively.
By hierarchical mode 64 QAM constellation and 16QAM constellation can be selected. The
available data rate is divided between the high priority channel and the low priority channel. The
bit rate for the high priority channel is equal to the capacity stated in the QPSK section of the
applicable table irrespective of the constellation chosen. For the low priority channel the
capacity depends on the chosen constellation (64Qam or 16QAM). By 64QAM constellation the
capacity of the hierarchical low priority channel is equal to the capacity stated in the 16QAM
section of the applicable table. By 16QAM constellation the capacity of the hierarchical low
priority channel is equal to the capacity stated in the QPSK section of the applicable table.
In Table 2-1the maximum useful bit rates are indicated for all valid transmission modes in an
8 MHz system.
Modulation
Code rate
Guard interval
1/4 1/8 1/16 1/32
½4,98 5,53 5,85 6,03
2/3 6,64 7,37 7,81 8,04
QPSK ¾7,46 8,29 8,78 9,05
5/6 8,29 9,22 9,76 10,05
7/8 8,71 9,68 10,25 10,56
½9,95 11,06 11,71 12,06
2/3 13,27 14,75 15,61 16,09
16-QAM ¾14,93 16,59 17,56 18,10
5/6 16,59 18,43 19,52 20,11
7/8 17,42 19,35 20,49 21,11
½14,93 16,59 17,56 18,10
2/3 19,91 22,12 23,42 24,13
64-QAM ¾22,39 24,88 26,35 27,14
5/6 24,88 27,65 29,27 30,16
7/8 26,13 29,03 30,74 31,67
Table 2-1Available data rate for 8MHz DVB-T

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2-5
In Table 2-2the maximum useful bit rates are indicated for all valid transmission modes in a
7 MHz system.
In Table 2-3the maximum useful bit rates are indicated for all valid transmission modes in a
6 MHz system.
With 204 byte packet input the maximum bit rates are increased accordingly.
Modulation
Code rate
Guard interval
1/4 1/8 1/16 1/32
½4,354 4,838 5,123 5,278
2/3 5,806 6,451 6,830 7,037
QPSK ¾6,532 7,257 7,684 7,917
5/6 7,257 8,064 8,538 8,797
7/8 7,620 8,467 8,965 9,237
½8,709 9,676 10,246 10,556
2/3 11,612 12,902 13,661 14,075
16-QAM ¾13,063 14,515 15,369 15,834
5/6 14,515 16,127 17,076 17,594
7/8 15,240 16,934 17,930 18,473
½13,063 14,515 15,369 15,834
2/3 17,418 19,353 20,491 21,112
64-QAM ¾19,595 21,772 23,053 23,751
5/6 21,772 24,191 25,614 26,390
7/8 22,861 25,401 26,895 27,710
Table 2-2 Available data rate for 7MHz DVB-T
Modulation
Code rate
Guard interval
1/4 1/8 1/16 1/32
½3,732 4,147 4,391 4,524
2/3 4,976 5,529 5,855 6,032
QPSK ¾5,599 6,221 6,587 6,786
5/6 6,221 6,912 7,318 7,540
7/8 6,532 7,257 7,684 7,917
½7,465 8,294 8,782 9,048
2/3 9,953 11,059 11,709 12,064
16-QAM ¾11,197 12,441 13,173 13,572
5/6 12,441 13,824 14,637 15,080
7/8 13,063 14,515 15,369 15,834
½11,197 12,441 13,173 13,572
2/3 14,929 16,588 17,564 18,096
64-QAM ¾16,796 18,662 19,760 20,358
5/6 18,662 20,735 21,955 22,620
7/8 19,595 21,772 23,053 23,751
Table 2-3 Available data rate for 6MHz DVB-T

Introduction and Applications ProTelevision Technologies PT 5780 DVB-T Modulator
Instruction Manual Revision 3.112-6
With Multi Frequency Network operation (MFN) the built-in Transport Stream Adapter (TSA)
performs the function of discarding any stuffing present on the input stream, inserting new
stuffing (0-packets) to adjust the bit rate and finally recalculating the PCR values of the MPEG2
transport stream. Thus the modulator will accept any transport stream with a useful bit rate
lower than the maximum indicated in the table.
When operating in the single frequency network mode, the bit rate must be exact. The applied
transport stream must furthermore include valid MIP information.
2.4 Alarm Circuits
Two independent alarm circuits are provided. Each circuit may be “armed” for a number of
conditions important for correct operation. Alarm output is via floating contacts on the rear panel
as well as via the remote control. A red LED on the front panel indicates an existing alarm
condition while the display will show the nature of the alarm.
2.5 Operation
The DVB-T Modulator may be configured and operated from either the front panel or via the
remote control port. The front panel control is implemented as a menu system. The status or
configuration menu of interest is displayed on a 2-line LCD display. Navigation between the
menus is done by means of a set of cursor keys (UP, DOWN, LEFT, RIGHT and an EXECUTE
key). To facilitate the remote control of several transmitters each modulator may be individually
named (16 characters). This “name” appears on the front panel display and is available on the
remote port.
Also the modulator may be controlled by data embedded in the incoming MPEG transport
stream itself. If this mode is enabled, it will have highest priority and other controls will be
inhibited. Note this will be the normal mode of operation in a Single Frequency Network (SFN).
When not assisting in configuration or mode selection, the front panel display will show the
status and operational modes of the modulator. In case of an alarm the nature of the cause of
the alarm will be shown.
All settings are always saved in an internal non-volatile storage. This means that the last saved
configuration will automatically be recalled at power on.
2.6 Frequency References
The modulator is equipped with an internal frequency reference with stability of ±
1ppm,adequate for many applications including multi frequency applications. Where higher
accuracies are required, an external 10 MHz frequency reference input is provided.
In Single Frequency Networks (SFN) this input must be connected to an external 10 MHz
reference typically obtained via GPS. In SFN mode the separate 1 pulse per second reference
input must also be connected to the special 1 PPS output of the GPS reference.

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2.7 Test Facilities
The DVB-T Modulator PT 5780 features a range of useful test signal for both off-line and on-line
testing.
Single carrier:
The single carrier test signal is an off-line test signal (i.e. it interrupts the modulators data
transmission). When the single carrier test signal is activated the normal DVB-T spectrum is
substitutes for a single continuous sine wave located at the centre frequency of the normal in-
service DVB-T spectrum. The RMS level of the sine equals the average RMS level in the full
bandwidth of the normal DVB-T spectrum. The signal is therefore excellent for adjusting
transmitter level and/or verifying frequency accuracy or phase noise performance for the
modulator output.
-1 Carrier test signal
For special tests any single one of the carriers in the DVB-T spectrum can be switched off. This
test signal is in principle an off-line test signal. However, as the FEC of the COFDM coding will
normally cope with the loss of a single carrier without difficulty the signal can be activated during
normal transmission with marginal influence to the performance (slight increase in BER may be
noticed).
-50 Carrier test signal
To allow analysis of in-band intermodulation in a transmitter system 50 consecutive carriers in
the DVB-T spectrum can be switched off. The location of the 50-carrier hole can freely be
selected but typically the hole is placed at the centre of the spectrum. It is recommended to use
this test signal only for off-line tests. However, in most cases the transmission service is
maintained despite the loss of 50 carriers thanks to the FEC of the COFDM coding.
TS Stuffing
This test signal facilitates testing of a transmission systems IF and/or RF parameters even when
no MPEG-2 input is available (MFN mode only). When the TS Stuffing signal is activated a
pseudo random bit sequence as described in section 9.16.1 of the DVB-T Measurement
Guidelines ETR 290 is transmitted.

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PT 5780 DVB-T Modulator ProTelevision Technologies Installation
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3Installation
3.1 Initial Inspection
Check the contents of the shipment for completeness and possible transport damage. If the
contents are incomplete or damaged, a claim should be filed with the carrier immediately, and
the ProTelevision Help Desk should be notified in order to facilitate the repair or replacement of
the instrument.
3.2 Safety Instruction
3.2.1 Earthing
Before any other connection is made, the instrument must be connected to a protective earth
conductor in one of the following ways: via the three-core mains cable via the protective earth
terminal marked.
Before connecting the equipment to the mains of the building installation, the proper functioning
of the protective earth lead of the building installation needs to be verified.
Warning: Any interruption of the protective conductor inside or outside the instrument, or
disconnection of the protective earth terminal, is likely to make the instrument dangerous.
Intentional interruption is prohibited.
3.3 Mains Voltage Cord and Fuses
Different power cords are available for the various voltage outlets.
Note:
If the mains plug has to be adapted for local use, only a qualified person should carry out this
task.
This instrument is equipped with a tap-less switch mode power supply that covers most nominal
voltage ranges in use: 90-132 VAC RMS / 180-250 VAC RMS. This obviates the need to adapt
to the local mains voltage.
The mains frequency is 48-65 Hz.
Warning: This instrument shall be disconnected from all voltage sources when renewing a fuse.
Mains fuse rating: 2 pcs. 1.25A slow blow, 250 V.
The mains fuse-holder is located on the rear panel of the instrument.
If the mains fuse has to be replaced please proceed as follows:
1. Remove the mains cable.
2. Lift the plastic cover (fuse-holder) by means of a small screwdriver.
3. Insert the new fuse into the top of the fuse-holder.
4. Re-insert the cover (fuse-holder).

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Warning: Make sure that only fuses of the required rating, voltage, and of the specified type are
used for replacement. The use of repaired (jumpered) fuses and/or the short-circuiting of the
fuse holder are prohibited. Fuses must only be replaced by a qualified person who is aware of
the hazards involved.
3.4 Rack Mounting
This instrument is delivered in a 19" cabinet. Four self-adhesive rubber feet are supplied
together with this instrument.
If several cabinets are mounted in a 19" rack, special attention must be paid to the temperature
inside the rack.
The DVB-T modulator is equipped with cooling fans and air inlets on the side of the cabinet.
Note: The operation of the fan is temperature controlled.
If the DVB-T Modulator is mounted between other instruments with high surface temperature,
this cooling may not be sufficient. Under these circumstances, it is recommended to make
space between the instruments, and to establish forced circulation (cooling) in the rack.
3.5 Cleaning
-Disconnect the instrument from the mains voltage supply before cleaning
-Use only a damp cloth
-Make sure that no liquid is spilled inside the instrument