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