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http://www.nec.com/global/prod/nw/broadcast/NEC Corporation
Embodying a commitment to quality and eco-friendliness
DTV-80 SeriesHigh-Power Liquid-Cooled Digital VHF TV Transmitter
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
VA3000QE
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.
Power Amplifiers (PA)
Features
3
The DTV-80 Series provides up to 8.7kW output power (average) by
using 10 sets of PA units in a single rack, achieving a footprint of only
590 (W) x 2,000 (H) x 1,000 (D) mm, making it one of the smallest
transmitter foot-prints in the world.
Small Footprint
With the adoption of Hybrid Closed System for cooling, there is the
advantage of excellent cooling liquid exchangeability and automatic
removal of air from the system when an amplifier is changed.
Advanced cooling system
All DTV-80 series transmitters are produced from, and supported by,
one common set of modules, resulting in reduced costs from purchase
to installation and support.
Reduced maintenance costs
To meet customer's ever increasing demands, the DTV-80 Series can
offer wide range of backup options such as redundancy only in the
liquid cooling system, redundant exciter, main/standby configuration
and N+1 configurations.
Wide range of redundancy configuration
The latest in digital broadcasting technology
By adopting the latest MOS FET in the newly developed VA3000QE PA,
the DTV-80 Series are able to achieve high efficiency, enabling to
reduce operation costs.
High Efficiency
The TX control unit of DTV-80 Series is controlled by PLD and thus able
to quick boot as the UHF Digital TV Transmitters - DTU-52 Series. With
it, users are able to monitor both operational status and log data
(including fault record), as well set the controls. For users who prefer
better visual operation, an optional color LCD display is also available.
User friendly monitoring and control
4
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.
Adaptive Digital Corrector (ADC)
N+1 System
Exciter
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.
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.
Functionality Benefits
DM-3000
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
5
Liquid Cooling System (single with redundancy)
Liquid Cooling
The liquid cooling system incorporates an automatic air-purge function
and an Adaptive Fault Forecast function. These failures work together
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
transmitter models.
“S Type” comes with single drive and single pump and heat exchanger.
“P Type” comes with dual drive and redundant pumps and heat
exchangers.
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.
Sample View of Signal Quality Monitoring DTV-80 Series Transmitter
PC IP
Network
TCP/IP
MM M
(Reserve fan)
Tank
Pump Pump PA /
PS
PA /
PS
PA /
PS
PA /
PS
Heat Exchanger
Pump Rack Transmitter
TX Control
6
Type Output Power1R8 1.8kW
2R7 2.7kW
3R6 3.6kW
4R4 4.4kW
5R3 5.3kW
6R2 6.2kW
7R0 7.0kW
7R8 7.8kW
8R7 8.7kW
DTV-80 Series Lineup
Transmitter Standard Configuration
Configuration of DTV-80 (Liquid-cooled) Series
DTV-80/ 1 2 3 1 : Output Power 2 : System Type
3 : Cooling Type
S : Single Transmitter with Single Drive
P : Single Transmitter with Dual Drive and Multiple PAs
(S)Q : Single liquid cooling system
(P)Q : Redundant liquid cooling system
BPF(Option)
PA 1
PA 2
PA n
n-Divider
n-Com
biner
Exciter
RFConverter
Pump Rack& H.EXC
Pump Rack& H.EXC
AdaptiveDigital
Corrector
OFDMEncoding
LocalOSC PS
Control Status
TX CONTLCD Display(option)
TS Input 1TS Input 2
Remote Control/SYS.CONT
AC Input
Output
Remote Control/SYS.CONT
BPF(Option)
PA 1
PA 2
PA n
n-Divider
Exciter S
witch
n-Com
biner
Exciter 1
RFConverter
AdaptiveDigital
Corrector
OFDMEncoding
LocalOSC PS
TS Input 1TS Input 2
External Reference Input
External Reference Input
Output
Control Status
TX CONT
LCD Display(option)
Exciter 2TS Input 1TS Input 2
AC Input
S Type
P Type
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
7
Transmitter Standard Configuration Table
DTV-80 Series Specifications
Equipment Composition[Sets]
Exciter ExciterSwitch
PA Divider/Combiner Rack Size (mm)
TransmitterOutputpower[kW]
Model Name
1.8kW
2.7kW
3.6kW
4.4kW
5.3kW
6.2kW
7.0kW
7.8kW
8.7kW
2
3
4
5
6
7
8
9
10
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
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
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)
Specification
Output Power
Output Frequency
Power Supply Voltage
Voltage Fluctuation
Power Supply Frequency
Frequency Stability
Amplitude -frequency Response
Bandwidth
Intermodulation Products
MER (Modulation Error Ratio)
Spurious Emission
Ambient Temperature Range
Relative Humidity
DVB-T/T2
1.8kW - 8.7kW (measured before mask filter output)
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
< -36dB
> 32dB
-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)
90% (no condensation)
DTV-80 Series High-Power Liquid-Cooled Digital VHF TV Transmitter
© 2011 NEC Corporation. NEC and the NEC logo are registered trademarks of NEC Corporation. Cat.No. H01-11080004E
NEC CorporationAmericas and EMEA Sales DivisionGreater China and Asia Pacific Sales DivisionBroadcast and Video Systems7-1, Shiba 5-chome, Minato-ku, Tokyo,
108-8001, Japan
Tel: +81-3-3798-5463
Fax: +81-3-3798-8476
NEC Europe Ltd.Network Solutions DivisionNEC House, 1 Victoria Road, London
W3 6BL, United Kingdom
Tel: +44-(0)20-8993-8111
Fax: +44-(0)20-8752-3735
NEC Asia Pacific Pte. Ltd.No. 1 Maritime Square
#12-10 HarbourFront Centre
Singapore 099253
Tel: +65 6278 1818
Fax: +65 6271 2088
NEC Latin America S.A.Av. Paulista, 2.300
01310-300 Sao Paulo, SP
Tel: +55 (0) 11-3151-7000
Fax: +55 (0) 11-3151-7218
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.
Safety precautions