DTV-80 Series

DTV-80 Series
High-Power Liquid-Cooled Digital VHF TV Transmitter
Embodying a commitment to quality
and eco-friendliness
NEC Corporation
http://www.nec.com/global/prod/nw/broadcast/
The new power in Digital TV
Broadcasting
Built on a solid foundation of experience
NEC transmitters are known throughout the broadcast community for their high reliability and minimal maintenance requirements. NEC's latest
DTV-80 series is based on technology accumulated in many years through broad experience and rich supply record and as well feedback from our
users. Variety of new technologies and useful functions to enhance user's operations and services are provided,including stable operating wideband power
amplifiers, digital linear correctors to reduce distortion and expand service area.
The DTV-80 is also ready to meet future requirements from users - by simply changing the exciter unit from DM-3000A to DM-4000A, the transmitter
is ready for DVB-T2 broadcast.
2
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
Features
Small Footprint
Reduced maintenance costs
The DTV-80 Series provides up to 8.7kW output power (average) by
All DTV-80 series transmitters are produced from, and supported by,
using 10 sets of PA units in a single rack, achieving a footprint of only
one common set of modules, resulting in reduced costs from purchase
590 (W) x 2,000 (H) x 1,000 (D) mm, making it one of the smallest
to installation and support.
transmitter foot-prints in the world.
Advanced cooling system
High Efficiency
With the adoption of Hybrid Closed System for cooling, there is the
By adopting the latest MOS FET in the newly developed VA3000QE PA,
advantage of excellent cooling liquid exchangeability and automatic
the DTV-80 Series are able to achieve high efficiency, enabling to
removal of air from the system when an amplifier is changed.
reduce operation costs.
Wide range of redundancy configuration
User friendly monitoring and control
To meet customer's ever increasing demands, the DTV-80 Series can
The TX control unit of DTV-80 Series is controlled by PLD and thus able
offer wide range of backup options such as redundancy only in the
to quick boot as the UHF Digital TV Transmitters - DTU-52 Series. With
liquid cooling system, redundant exciter, main/standby configuration
it, users are able to monitor both operational status and log data
and N+1 configurations.
(including fault record), as well set the controls. For users who prefer
better visual operation, an optional color LCD display is also available.
The latest in digital broadcasting technology
Power Amplifiers (PA)
The newly developed VA3000QE power amplifier utilizes the latest high power LDMOS, realizing compact design, enhanced efficiency and
producing excellent reliability.
Each PA can produce an output power of 1kW average and incorporates a switching power supply. Furthermore, it features an optimized
combination of wideband matching circuits and controls.
In terms of safety features, the PA is incorporated with a RS-485 interface, enabling comprehensive monitoring and remote control functionality. With
the added benefit of self-protection circuits against external factors such as high temperature, reflected power, low AC voltage and internal factors
such as overvoltage and over current.
Additionally, the PA is equipped with RF over input protection, which has a function of protecting the PA against excessive output power produced
from the exciter due to human mis-operation and from the excessive input power in case there is malfunction in the divider.
VA3000QE
3
Exciter
The compact DM-3000 Series Digital Exciter is packed with NEC's state-of-the-art technology. A synthesizer tuned to VHF Band III signals enables
direct conversion to a RF output. Higher or lower bit rates are modified to usable bit rates for flexible bit-rate adaptability. Using the MIP created by
the SFN adapter, seamless ASI switching can be performed. A truly impressive characteristics of the DM-3000 Series Digital Exciter is the ability to
work in conjunction with other NEC transmitters as a signal processor - which greatly reduces the necessity for spare units while simplifying
maintenance.
By changing the exciter to NEC's DM-4000A Digital Exciter, the DTV-80 Series is able to broadcast in DVB-T2.
DM-3000
Functionality Benefits
Adaptive Digital Corrector (ADC)
The ADC automatically generates correction factors of non-linearity distortion and updates the correction table without interrupting program service.
Optimum signal quality and service coverage are maintained, protected from the effects of ambient temperature, aging and other factors. The ADC
comes integrated in the DM-3000 Series Digital Exciters and can be used to generate the correction factor for preset correction. Furthermore, the
ADC is capable of analyzing feedback signals from the TX output, including inter-modulation level, MER value and other graphical data.
Automatic adjustment of the IMP/MER values greatly reduces the time required for maintenance.
N+1 System
The DTV-80 Series frequency-agile design, allows for the construction of an N+1 system, offering redundancy for maximized reliability and
transmission time. By using N+1 controller, up to 8+1 system are available.
At any given time, there is a transmitter ready to be activated should one of the active transmitters malfunction. When activated, the spare transmitter
adjusts its frequency band accordingly without interfering the broadcast signals.
4
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
Liquid Cooling
The liquid cooling system incorporates an automatic air-purge function
Liquid Cooling System (single with redundancy)
and an Adaptive Fault Forecast function. These failures work together
Heat Exchanger
to cut noise and installation costs, making the maintenance easier and
boosting reliability. Coolant feeding and dust removal have been greatly
simplified by a hybrid closed circuit, ensuring the coolant remains clean.
There are two types of cooling systems that can be selected from the
M
M
M
(Reserve fan)
transmitter models.
“S Type” comes with single drive and single pump and heat exchanger.
TX Control
Pump
Pump Rack
PA / PS
Pump
PA / PS
exchangers.
PA / PS
Tank
PA / PS
“P Type” comes with dual drive and redundant pumps and heat
Transmitter
Optional Color LCD
A color LCD screen can be selected as option, which features an intuitive GUI (Graphical User Interface), making transmitter control, monitoring and
maintenance extremely easy to perform. The log data not only displays changes in operational status, including faults, but also enables verification of
related data in case of system failure, thereby streamlining analysis of abnormal status. Frequency setting can be conducted at the touch of a button
on the color LCD screen.
Remote Control/Monitoring
The DTV-80 Series incorporates a web server and SNMP agent, enabling the transmitter to be conducted to a local area network for monitoring and
control of transmitter operations via a remote PC with a web browser. Whilst also allowing a SNMP manager to monitor and control from a different
location at the same time. Thus, provide a cost-efficient maintenance, whilst the transmitter is in operation and without the requirement of expensive
measurement equipment.
TCP/IP
PC
IP
Network
Sample View of Signal Quality Monitoring
DTV-80 Series Transmitter
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Configuration of DTV-80 (Liquid-cooled) Series
DTV-80 Series Lineup
DTV-80/ 1 2 3
1
2
: Output Power
Type
1R8
2R7
3R6
4R4
5R3
6R2
7R0
7R8
8R7
: System Type
S : Single Transmitter with Single Drive
P : Single Transmitter with Dual Drive and Multiple PAs
Output Power
1.8kW
2.7kW
3.6kW
4.4kW
5.3kW
6.2kW
7.0kW
7.8kW
8.7kW
3
: Cooling Type
(S)Q : Single liquid cooling system
(P)Q : Redundant liquid cooling system
Transmitter Standard Configuration
S Type
Exciter
Local
OSC
Adaptive
Digital
Corrector
RF
Converter
PA 1
PS
PA 2
PA n
External Reference Input
Control
Remote Control/
SYS.CONT
AC Input
n-Combiner
OFDM
Encoding
n-Divider
TS Input 1
TS Input 2
BPF
(Option)
Output
Status
Pump Rack
& H.EXC
TX CONT
LCD Display
(option)
P Type
PS
External Reference Input
TS Input 1
TS Input 2
RF
Converter
PA 1
PA n
6
BPF
(Option)
Exciter 2
Control
Remote Control/
SYS.CONT
AC Input
PA 2
n-Combiner
Local
OSC
Exciter 1
Adaptive
Digital
Corrector
Exciter Switch
OFDM
Encoding
n-Divider
TS Input 1
TS Input 2
Status
TX CONT
LCD Display
(option)
Pump Rack
& H.EXC
Output
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
Transmitter Standard Configuration Table
Output
power
[kW]
1.8kW
2.7kW
3.6kW
4.4kW
5.3kW
6.2kW
7.0kW
7.8kW
8.7kW
Equipment Composition
[Sets]
Transmitter
Model Name
Exciter
Exciter
Switch
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1
1
1
1
1
1
1
1
DTV-80/1R8SQ
DTV-80/1R8PQ
DTV-80/2R8SQ
DTV-80/2R8PQ
DTV-80/3R6SQ
DTV-80/3R6PQ
DTV-80/4R4SQ
DTV-80/4R4PQ
DTV-80/5R3SQ
DTV-80/5R3PQ
DTV-80/6R2SQ
DTV-80/6R2PQ
DTV-80/7R0SQ
DTV-80/7R0PQ
DTV-80/7R8SQ
DTV-80/7R8PQ
DTV-80/8R7SQ
DTV-80/8R7PQ
PA
2
3
4
5
6
7
8
9
10
Divider/Combiner
Rack
Size (mm)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
590 (W) x 2,000 (H) x 1,000 (D)
DTV-80 Series Specifications
Specification
DVB-T/T2
Output Power
1.8kW - 8.7kW (measured before mask filter output)
Output Frequency
Power Supply Voltage
Voltage Fluctuation
Power Supply Frequency
Frequency Stability
Amplitude -frequency Response
Bandwidth
170 - 230 MHz(Band III)
3 x 380/400/415 V, or 3 x 208/230 V
-15%, +10%
50/60Hz ± 2%
±1.0 x 10-7 over a period of 1 year with internal reference
±0.5dB(excluding BPF)
6MHz, 7MHz, 8MHZ
Intermodulation Products
< -36dB
MER (Modulation Error Ratio)
> 32dB
Spurious Emission
Ambient Temperature Range
ɘ-60dBc
Indoors: 0˚C to +45˚C
Outdoors: 0˚C to +45˚C or
-30˚C to +40˚C (using antifreeze and 3-way valve system)
Relative Humidity
ɘ90% (no condensation)
7
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
Safety precautions
To install, make connections and operate this product, please carefully read and observe instructions,
precautions and recommendations in our instruction manuals.
The colours in this brochure may differ from those of the actual unit. Designs and specifications of this product is subject to change without prior notice.
NEC Corporation
Americas and EMEA Sales Division
Greater China and Asia Pacific Sales Division
Broadcast and Video Systems
7-1, Shiba 5-chome, Minato-ku, Tokyo,
108-8001, Japan
Tel: +81-3-3798-5463
Fax: +81-3-3798-8476
NEC Europe Ltd.
Network Solutions Division
NEC House, 1 Victoria Road, London
W3 6BL, United Kingdom
Tel: +44-(0)20-8993-8111
Fax: +44-(0)20-8752-3735
© 2011 NEC Corporation. NEC and the NEC logo are registered trademarks of NEC Corporation.
NEC Asia Pacific Pte. Ltd.
NEC Latin America S.A.
No. 1 Maritime Square
#12-10 HarbourFront Centre
Singapore 099253
Tel: +65 6278 1818
Fax: +65 6271 2088
Av. Paulista, 2.300
01310-300 Sao Paulo, SP
Tel: +55 (0) 11-3151-7000
Fax: +55 (0) 11-3151-7218
Cat.No. H01-11080004E
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