SVP HDT-02 User manual

HDT-02 Transmitter Manual
Version V9.9

Accessories included in this manual:
PA / PA Ultralinear
Power Amplifier
Clip-on Amplifier
AVF Flexible Antenna
GPS-01
Antenna
RTC-02
Remote Control
RTC-01
Remote Control

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 3
Contents
Chapter 1: Introduction
This chapter provides a general description of the High Definition HDT-02
camera Transmitter.
Chapter 2: Technical features
This part offers the Transmitter’s physical and environmental characteristics.
Chapter 3: How to order
The third part provides the user with information on ordering and different
configurations available for these receivers.
Chapter 4: Transmitter operation and Menus
This part provides the user with all the necessary information to control and
operate the equipment properly. It is detailed the function of each button on
the keyboard and the information shown on the display, menus, etc.
Chapter 5: GPS Application
In this chapter, the use of the GPS incorporated system and some of its
applications are shown.
Chapter 6: Web Server
This chapter provides a detailed description of the Web Server tool. This
feature allows controlling the HDT-02 Transmitter through a website.
Chapter 7: Block Diagram
This chapter provides a block diagram of the HDT-02 Transmitter internal
performance.
Chapter 8: Equipment Installation
This chapter indicates the available connections of the Transmitter, the
characteristics and the installation.
Chapter 9: Remote Control
The use of the RTC-01 or RTC-02 devices provide a remote connection to the
HDT-02 Transmitter.
Chapter 10: Mechanical Dimensions
In this chapter, the mechanical drawing of the units described in this manual
are included.
Chapter 11: Preventive maintenance
This chapter explain the procedure that should be followed during the
Transmitter's life.
Chapter 12: Warranty
This chapter contains warranty considerations and conditions.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 4
Annex A: PA Power Amplifiers
This annex explains the main characteristics of SVP Broadcast Microwave’s
PA Power Amplifiers.
Annex B: PAC Clip-On Power Amplifiers
This annex explains the main characteristics of SVP Broadcast Microwave’s
PAC Clip-On Power Amplifiers.
Annex C: AVF Flexible Antenna User’s Guide
The different flexible antennas and its characteristics are explained in this
chapter.
Annex D: GPS-01 Receiver
The technical information for the external GPS antenna and receiver is given
here.
Annex E: Modulation Standards
This chapter describes the DVB-T/T2 and DVB-S/S2 standards, as well as
their features and the differences between them.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 5
Dear Customer,
We would like to thank you for selecting this equipment and welcome you to
the SVP’s growing family of products.
We are sure that the addition of this equipment will give you a complete
satisfaction in your existing installation.
Please read these instructions carefully, and keep them in hand in case you
have to refer to them.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 6
About this manual
This user’s guide provides indications and explanations about how to set up
the HDT-02 easily for the most common use cases.
This document is intended to help first time users:
•To find their way around the GUI.
•To understand the different possibilities of the HDT-02.
•To configure the HDT-02 for their specific configurations.
Symbols
The symbols that appear in this manual are:
An information message which indicates explanations for the
proper operation of the equipment.
It advises users that if they do not take, avoid or make specific
actions, damage could appear in the device.
In the places where this symbol appears it means that by pressing
the Down button of the equipment the user can access to the next
screen.
This symbol means that pressing the OK button in the options
where this symbol appears, the user can access the submenu
related to that option or can change the value of the parameter.
These symbols mean that the parameter can be modified on the
same screen with the right and left keys.

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HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 7
Important Notes
•The HDT-02 H.264 High Definition multiband Transmitter is completely
compatible with the DVB-T/T2/S/S2 Standards, included in the
European Standard ETSI EN300744 (DVB-T), ETSI EN300755 (DVB-T2),
ETSI EN302307 (DVB-S2) (optional) and ETSI EN300421 (DVB-S)
(optional). It also complies with the ISDB-T International technical
standard (optional).
•It is important to note that when the Transmitter is switched on, the
selected RF output connection must be connected to a suitable antenna
or charged.
•The HDT-02 H.264 High Definition multiband Transmitter applies a
MPEG-4 compression to either HDMI, composite video or SDI input
signals. An MPEG-1 layer 2 compression is applied to the corresponding
4 analogue Audio channels, the 2 stereo SDI embedded, the HDMI
embedded and the AES digital Audio signals. The resulting multiplexed
signal is transmitted using COFDM modulation.
•The HDT-02 H.264 High Definition multiband Transmitter is available
from 1 GHz to 6.4 GHz, for the DVB-T2, DVB-T and optionally ISDB-T
RF stage. The L band output for the DVB-S2 and DVB-S is optional.
•If the RF output is set to DVB-T2 and the selected bandwidth is 1.7 MHz
then, the device automatically disables the Audio2 and it sets the bitrate
of the Audio1 to 128 Kbps.
•The equipment’s maximum output power for the DVB-T2/T and ISDB-T
is 100 mW in 2 GHz frequency band, (selectable from -5 to +20 dBm)
and for the DVB-S2 and DVB-S is from -50 to + 5 dBm.
•Special care should be taken with SDI cables, quality and length, as
these are very important, especially when HD-SDI or 3G SDI signals are
transmitted.
•If any Audio or data channel are not used in a transmission, they should
be disabled, in order to assign that bitrate to the video and achieve a
higher quality transmitted video signal.
•Only authorized personnel should open the unit and any repair or
warranty will be invalidated if the seals are broken.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 8
Safe Operating Procedures
In this section the safety requirements are shown in order to ensure
awareness of potential hazard to the personnel who is operating and
maintaining the equipment.
FCC
This chapter has been made taking into account the OET bulletin 65, from
August 1997, recommended by the FCC (Federal Communications
Commission).
The HDT-02 H.264 Transmitter designed to provide services for broadcasting,
will not create RF energy exceeding 1.0 mW/cm2, the FCC limit for exposure.
This is known as the Maximum Permissible Exposure (MPE) limit. This
Transmitter follows this law (with the AVF flexible antenna 3 dBi) as long as
the distance between the antenna and the person is at least 4 cm. In the case
the PA-5 (5 W Power Amplifier), the minimum distance is 28.2 cm and if PA-
10 (10 W Power Amplifier) is used, the minimum distance is 39.9 cm. SVP
Broadcast Microwave, in accordance with the requirements set forth by the
FCC, provides this information as a guide to the user. Next are shown the
calculations made to obtain those values:
S = MPE in mW/cm2(milliwats per square centimeters)
To follow the law, S maximum must be 1.0 mW/cm2
 



EIRP=P·G
󰇛󰇜

Where:
EIRP : Equivalent isotropically radiated power
G(dBi): Antenna gain in dBi
P: Output power of the Transmitter (W)
R: Distance from the antenna to the Transmitter (cm)

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 9
1. HDT-02 Transmitter with AVF antenna (3 dBi)
G = 3
Pmax = 100 mW
EIRP = 200 mW
Rmin = 4 cm = 1.57 in
2. HDT-02 Transmitter + PA-5 (5 W) with AVF antenna
G = 3
Pmax = 5000 mW
EIRP = 10000 mW
Rmin = 28.2 cm = 11.1 in
3. HDT-02 Transmitter + PA-10 (10 W) with AVF antenna
G = 3
Pmax = 10000 mW
EIRP = 20000 mW
Rmin = 39.9 cm = 15.7 in

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 10
Declaration of RF Exposure Compliance for Exemption
from Routine Evaluation Limits
SAR Evaluation –AVF-203 antenna
As shown in the point number 2.5.1 from the RSS-102 Radio Standard
Specification, SAR evaluation is not required if the separation distance
between the user and the radiating element of the device is more
than 20 cm.
The equipment, which consists of the HDT-02 Transmitter with the AVF-203
antenna fixed to it, fulfills this requirement. As shown in the figure below, the
distance between the device’s radiating element (situated at the top of the
antenna) and the nearest part of the user’s body is further than 20 cm in
length. If the length from the radiating element to the bottom of the antenna
is 20 cm, then the distance between the nearest part of the user’s body and
the radiating element will be higher than 20 cm. As the camera user always
uses the camera in the same way and the antenna is fixed to the camera, the
distance is always maintained.
Conclusion: This equipment is exempted from SAR evaluation.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 11
RF Exposure Evaluation
As shown in the point number 2.5.2 from the RSS-102 Radio Standard
Specification, RF exposure evaluation is required if the separation
distance between the user and the device’s radiating element is lower than
20 cm, except when the device operates as follows:
-Below 1.5 GHz and the maximum e.i.r.p. of the device is equal
to or less than 2.5 W.
-At or above 1.5 GHz and the maximum e.i.r.p. is equal to or less
than 5 W.
Due to the fact, this equipment is going to operate above 1.5 GHz and the
maximum e.i.r.p. is 200 mW (with the AVF-203L or the AVF-203LB antenna),
this equipment is exempted from the RF exposure evaluation. When this
equipment is operating below 1.5 GHz, it is also exempted from the RF
exposure evaluation because the maximum e.i.r.p. (200mW) is lower than
2.5 W.
Conclusion: This equipment is exempted from the RF exposure
evaluation.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 12
First Aid in Case of Electric Shock
DO NOT TOUCH THE VICTIM WITH YOUR BARE HANDS until the circuit is
broken. SWITCH OFF. If this is not possible, PROTECT YOURSELF with DRY
insulating material and pull the victim clear of the conductor.
If breathing has stopped, indicated by unconsciousness, lack of respiratory
movements and a ‘blue’ look to cheeks, lips, ears and nails, START
RESUSCITATION AT ONCE.
EMERGENCY RESUSCITATION –THE EXPIRED AIR METHOD
(Approved by the Royal Life Saving Society)
1. If possible, lie the victim on his back with his head slightly higher than
his feet. Clear the mouth and throat of any obvious obstruction.
2. Kneel on one side of the victim, level with his head. LIFT THE JAW
AND TILT THE HEAD BACK AS FAR AS POSSIBLE (Figs. 1a and 1b)
3. One of the following may happen:
a. Breathing may begin and consciousness
returns.
b. Breathing may begin but consciousness NOT
returns. Turn the victim on his side and
ensure that the airway is kept clear.
c. Breathing may return but be NOISY which
means that the airway is not fully clear. Try to
clear the airway.
4. IF THERE NO SIGN OF BREATHING:
a. Check that the head is still tilted back.
b. Take a deep breath.
c. Pinch the victim’s nose and blow firmly into
his mouth (Fig. 2). As you do, the chest will
RISE.
d. Turn your head away and take another
breath, watching for the chest to FALL (Fig.
3).
5. Start with four quick breaths and then continue with
one breath every five seconds (i.e. 12 times a
minute). This should be continued until the victim
revives or a doctor certifies death.
6. As consciousness returns the victim will start to breathe on his own,
and a ‘pink’ color replaces the ‘blue’ look: this is the time to stop
resuscitation. Continue to hold his chin up and so keep the airway
clear.
7. In the case of injuries to the mouth, it may be necessary to use
mouth-to-nose resuscitation. Seal the victim’s mouth with your cheek
and blow firmly into his nose, proceeding as above.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 13
8. In the case of severe facial injuries, it may be necessary to do a
manual method of artificial respiration (Silvester-Brosch or Holger
Nielsen). Briefly, these methods apply compression to ribcage with
the victim lying on his back (S-B) or face down (H.N.) with associated
movement of his arms up and out. The cycle of movement should
take about five seconds, i.e. the normal breathing phase.
9. Whatever the method, it is ESSENTIAL to commence resuscitation
WITHOUT DELAY and to send for medical assistance immediately.
TREATMENT FOR BURNS
If the victim is also suffering from burns, then, without hindrance to
resuscitation, observe the following:
1. DO NOT ATTEMP TO REMOVE CLOTHING ADHERING TO THE BURN.
2. If possible, alleviate the pain from the burnt part by immersing in cold
water.
3. If help as available or as soon as resuscitation is no longer required,
the wound should be covered with a DRY clean dressing.
4. Oil or grease in any form should not be applied.
5. If severely burnt, get the victim to hospital immediately.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 14
Chapter 1: Introduction ................................................................. 18
Chapter 2: Technical features ........................................................ 22
Chapter 3: How to order ................................................................ 26
Chapter 4: Transmitter Operation and Menus ................................ 27
4.1 Display.....................................................................................27
4.1.1 Main Screen for the DVB-T2 ..................................................30
4.1.2 Main Screen for the DVB-T ....................................................32
4.1.3 Main Screen for the DVB-S2 ..................................................34
4.1.4 Main Screen for the DVB-S....................................................36
4.2 LEDs........................................................................................38
4.3 Front panel...............................................................................39
4.3.1 ON/OFF Button ....................................................................39
4.3.2 OK Button...........................................................................39
4.3.3 Cross Button .......................................................................40
4.3.4 Left and Right Button ...........................................................40
4.3.5 Up and Down Button ............................................................40
4.3.6 RF Button ...........................................................................40
4.4 Menu Scheme ...........................................................................42
4.5 Menu Navigation .......................................................................47
4.6 Menu Structure .........................................................................48
Chapter 5: GPS Application .......................................................... 115
5.1 Introduction............................................................................ 115
5.2 Main Screen............................................................................ 116
5.3 GPS Transmitter Screen ........................................................... 116
5.4 Application Example 1 –Constant Positioning.............................. 118
Chapter 6: Web Server................................................................. 119
6.1 Introduction............................................................................ 119
6.2 Web Page Overview ................................................................. 122
6.2.1 ENCODER ......................................................................... 123
6.2.2 RF.................................................................................... 130
6.2.3 UNIT ................................................................................ 139
6.3 Web Page Setup Notes............................................................. 143
6.4 SNMP..................................................................................... 144
6.4.1 SNMP commands ............................................................... 144
Chapter 7: Block Diagram ............................................................ 145
7.1 Introduction............................................................................ 145
Chapter 8: Equipment Installation ............................................... 147

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 15
8.1 Introduction............................................................................ 147
8.2 Connections............................................................................ 147
8.2.1 Power supply..................................................................... 149
8.2.2 BUC-PA-CC Connector ........................................................ 150
8.2.2.1 BUC Connection pinout .................................................... 151
8.2.2.2 HDT-02 to PA Control Cable pinout.................................... 151
8.2.3 RTC Connector .................................................................. 152
8.2.3.1 HDT-02 to RTC-01 and RTC-02 Cable pinout....................... 153
8.2.4 GPS-CVBS......................................................................... 153
8.2.5 Video inputs ...................................................................... 155
8.2.6 Audio inputs ...................................................................... 156
8.2.7 Remote ............................................................................ 157
8.2.8 USB ................................................................................. 157
8.2.9 RF output.......................................................................... 158
8.2.10 ASI output ...................................................................... 160
8.3 Mechanical Accessories ............................................................ 161
8.3.1 Battery Fastening .............................................................. 161
Chapter 9: Remote Control .......................................................... 162
9.1 Introduction............................................................................ 162
9.2 RTC-01 .................................................................................. 162
9.2.1 Remote Control Operation................................................... 162
9.2.2 Connections ...................................................................... 164
9.2.3 Alarms.............................................................................. 168
9.2.4 Brightness control .............................................................. 169
9.3 RTC-02 .................................................................................. 170
9.3.1 Remote Control Operation................................................... 170
9.3.2 Connections ...................................................................... 171
9.3.3 Alarms.............................................................................. 175
9.3.4 Brightness control .............................................................. 175
Chapter 10: Mechanical Dimensions ............................................ 177
10.1 HDT-02 Transmitter ............................................................... 178
10.2 PA Standard and PA Ultralinear Power Amplifiers ....................... 179
10.3 PA Standard and PA Ultralinear Power Amplifiers Installation....... 180
10.4 RTC-01 Remote Control.......................................................... 181
10.5 RTC-02 Remote Control.......................................................... 182
10.6 CLTX-01 Support ................................................................... 183
10.7 CLTX-02 Support Installation .................................................. 184

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 16
10.8 GPS-01 Antenna & Receiver .................................................... 185
Chapter 11: Preventive Maintenance ........................................... 186
11.1 Maintenance Schedule............................................................ 186
11.2 Maintenance Procedures ......................................................... 186
11.3 Spare Parts........................................................................... 186
Chapter 12: Warranty .................................................................. 187
12.1 Warranty information ............................................................. 187
12.2 Claim for damage in shipment................................................. 187
12.3 Return procedures ................................................................. 187
12.4 Transportation and packaging ................................................. 188
12.5 Authorization for evaluation .................................................... 188
Annex A: PA Standard and PA Ultralinear Power Amplifiers ........ 189
A.1 Introduction ........................................................................... 190
A.2 PA & PA Ultralinear .................................................................. 191
A.2.1 Technical Specifications ...................................................... 191
A.2.2 Block Diagram................................................................... 193
A.2.3 Equipment Installation........................................................ 195
A.3 Quick User Guide .................................................................... 199
A.3.1 PA Configuration................................................................ 199
A.3.2 Alarms ............................................................................. 202
A.4 Intermodulation ...................................................................... 203
Annex B: PAC Clip-On Power Amplifiers....................................... 204
B.1 Introduction ........................................................................... 204
B.2 Technical Features................................................................... 205
B.3 Connections............................................................................ 206
B.3.1 Power supply..................................................................... 207
B.3.2 RF Input ........................................................................... 207
B.3.3 RF Output ......................................................................... 208
B.4 Amplifier operation tips ............................................................ 208
Annex C: AVF Flexible Antenna .................................................... 209
C.1 Description ............................................................................. 209
C.2 Technical Specifications ........................................................... 210
Annex D: GPS-01 Receiver ........................................................... 212
D.1 Description............................................................................. 212
D.2 Technical Specifications ........................................................... 213
Annex E: Modulation Standards ................................................... 215
E.1 DVB-T.................................................................................... 215

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 17
E.1.1 How Does It Work.............................................................. 215
E.2 DVB-T2 .................................................................................. 216
E.2.1 How Does It Work.............................................................. 216
E.2.2 DVB-T2 New Features ........................................................ 216
E.2.3 DVB-T vs DVB-T2............................................................... 217
E.3 DVB-S.................................................................................... 218
E.3.1 How Does It Work.............................................................. 218
E.4 DVB-S2.................................................................................. 219
E.4.1 How Does It Work.............................................................. 219
E.4.2 Pilots in DVB-S2 ................................................................ 221
E.4.3 DVB-S vs DVB-S2 .............................................................. 222
Glossary....................................................................................... 224

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 18
Chapter 1: Introduction
The HDT-02 is the multifunction and multiband Transmitter developed by SVP
Broadcast Microwave. The features of this equipment, achievable only by
SVP, make this Transmitter the most advanced in the market to date.
Its feature H.264 encodes for 3G, high definition (HD) and standard definition
(SD) signals with ultra-low latency. H.264 transmission is possible using 40%
lower bitrate than conventional MPEG-2 systems.
This new generation Transmitter accepts analogue video, 3G/HD/SD-SDI and
HDMI video input signals. Analogue, SDI embedded, HDMI embedded and
AES Audio inputs are available as standard. User data or GPS data can be
transmitted over the data channel.
The ASI output enables the user to employ the Transmitter as a standalone
encoder.
The HDT-02 Transmitter performs DVB-T2 and DVB-T modulations with a
frequency band from 1 GHz to 6.4 GHz. Optionally it can perform ISDB-T with
interlace. DVB-T enables compatibility with nearly all types of receivers. DVB-
T2 modulation outperforms DVB-T modulation and offers much higher data
rate, which renders a higher signal quality or much more robust signal than
other modulations, achieving longer and more complex links.
Optionally, this Transmitter also performs DVB-S2 and DVB-S modulation. An
L band IF output is available, which enables use of the Transmitter as a
satellite Encoder & Modulator unit.
Control, operation and monitoring of the HDT-02 Transmitter are very
friendly. All the parameters of the Transmitter can be configured in field.
Furthermore, 7 presets are configurable for quick equipment set up. A wide
range of accessories allows the use of this equipment in many different
applications.
Optionally, a bidirectional camera control can be integrated which enables full
control of the camera functions.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 19
General Features
Input video signals such as composite video, 3G–SDI, HD-SDI, SD-SDI or
HDMI are MPEG-4 encoded, together with 4 analogue Audios, 2 stereo
AES/EBU channels, HDMI embedded or 4 digital Audios embedded on the SDI
signal. The video formats can be 1080p, 1080i, 720p, 576i or 480i. This
Transmitter also has a test pattern and a test tone generator available.
This device has a data channel available that allows transmitting user data or
GPS data as well as a Transport Stream ASI input so it can be used as a
repeater.
The encoder uses a H.264/MPEG-4 Part 10 video compression that provides
output bitrates from 1 Mbps to 100 Mbps and a MPEG-1 Layer II Audio
compression which supplies different Audio bit rates (128, 160, 192, 256 or
384 Kbps).
Encoded signals can be encrypted using BISS-1 or BISS-E scrambling system,
and optionally AES 128 and 256. The encrypted signal will only be received
by the receivers that have a valid descrambling key.
It has a display and a keyboard which makes the configuration and monitoring
of every parameter of the equipment possible.
The equipment is fed with DC power supply from 8 to 36V. It can be powered
through DC power supply connector or through the battery mount (optional).
Its excellent design, mechanical and electronic assembly make the HDT-02 a
robust and reliable solution.
DVB-T2 features
It is available from 1 GHz to 6.4 GHz through three different output bands,
being 100 mW the maximum output power. High quality components have
been used to achieve the best output signal quality.
The HDT-02 digital camera Transmitter uses COFDM (Coded Orthogonal
Frequency Division Multiplexing) modulation system (1K, 2K, 4K) which
provides superior signal robustness and a higher link performance. This
technology provides operators with efficient means to overcome the
challenges of NLOS propagation and mobile channels propagation.
COFDM spread spectrum modulation system distributes the data over a large
number of closely-spaced carriers, for example, 1705 carriers in 2K mode.
The data is divided into several parallel data streams, one for each carrier,
so, each carrier transports a lower data rate and the symbol duration is
longer. Each carrier is then modulated with a QPSK, 16QAM, 64QAM or
256QAM scheme. Moreover, the rotated constellation technique is applied in
order to improve the link performance.
A COFDM modulated signal, as it uses a low symbol rate modulation scheme
(i.e. where the symbols are relatively long compared to the channel time
characteristics), suffers less from intersymbol interference (ISI) caused by
multipath propagation. As the duration of each symbol is long, it is feasible
to insert a guard interval between the COFDM symbols, thus eliminating the
intersymbol and co-channel interference. So, if one carrier’s information is
lost, only a small part of the whole information would be lost.

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 20
Besides, in COFDM, the sub-carrier frequencies are chosen so that the sub-
carriers are orthogonal to each other, meaning that cross-talk, interference,
between the sub-channels is eliminated. The orthogonality allows high
spectral efficiency.
On the other hand, COFDM system is invariably used in conjunction with
channel coding (forward error correction). The error correction code used in
this equipment is Reed-Solomon coding, which is concatenated with LDPC,
and there is an additional interleaving between the two layers of coding. Error
correcting codes build redundancy into the transmitted data stream. This
redundancy allows bits that are in error or even missing to be corrected in
the receiver.
The European ETSI EN 300755 standard defines the following LDPC coding
rates: 1/2, 3/5, 2/3, 3/4, 4/5, 5/6. There is a compromise between the coding
rate (signal robustness) and the transmitted bit rate. If the coding rate is
higher the signal transmission is more robust (1/2 is the most robust) but the
bit rate that the system is able to transmit is lower.
Used modulation scheme of each COFDM sub-carrier, QPSK, 16QAM, 64QAM
and 256 QAM is also connected with signal robustness and transmitted bit
rate. QPSK is the most robust and 256QAM is able to transport a higher bit
rate.
Besides the system can define 4 guard intervals: 1/4, 1/8, 1/16 and 1/32.
The guard interval is used to reduce intersymbol interferences due to the
multipath propagation.
In addition, it also provides several bandwidths: 1.7, 5, 6, 7 and 8 MHz in
case there are needed for different applications.
To summarize, with all of these characteristics, the maximum bit rate
achieved is 46 Mbps.
DVB-T features
The RF stage of the HDT-02 Transmitter is the same as the DVB-T2 one. The
difference is found in the modulation part as it is commented below.
The HDT-02 digital camera Transmitter uses COFDM (Coded Orthogonal
Frequency Division Multiplexing) modulation system (2K mode).
The European ETSI EN 300744 standard defines the following convolutional
coding rates: 1/2, 2/3, 3/4, 5/6, 7/8.
Used modulation scheme of each COFDM sub-carrier, QPSK, 16QAM and
64QAM, is also connected with signal robustness and transmitted bit rate.
QPSK is the most robust and 64QAM is able to transport a higher bit rate.
Besides the system can define 4 guard intervals: 1/4, 1/8, 1/16 and 1/32.
In conclusion, with all of these characteristics, the maximum bit rate achieved
is 31.67 Mbps.