High-Power Digital TV Transmitter

DTU-52 Series
High-Power　Digital TV
Transmitter
Features
• Small footprint
- 590 (W) x 2,000 (H) x 1,000 (D)mm for 8.7kW
• High efficiency
- Excellent broadband matching circuit at amplifier modules
• New TRPA -UA4000QE
- Using the latest high-power LDMOS　- Output power of TRPA is 1kW average and/or 2kW at sync peak
1st Edition
NEC leads the digital TV broadcasting industry
around the world
NEC is a leading global company which offers world-class know-how and resources in the
technology of broadcasting networks.
O ur n ewest model of d i g i t a l T V t r a n s m i t t e r
The continued evolution and integration of broadcast technology led us to develop a new high-power
Transistor　Power　Amplifier (TRPA) designated UA4000QE which our new high-power digital TV
▲
transmitter, the DTU-52 series, utilizes.
DTU-52 8.7kW Model DTU-52/8R7PQ
The DTU-52 series inherits the technologies and performance of previous model DTU-51, which has
been highly evaluated in the field widely, and adds innovative new technology.
This realizes even higher reliability in a high-quality digital TV transmitter.
Besides the two main features — high reliability and low maintenance — of our existing digital TV
transmitters, we have successfully achieved two additional advantages — high efficiency and a small
footprint — for this new DTU-52 series.
Hi gh e ff iciency
By adopting this new TRPA, the DTU-52 series enables a reduction in power consumption by an
average of 20 to 30% compared with previous models.
Small fo ot pr int
The DTU-52 series provides up to 8.7kW output power (average) by using 10 sets of TRPA units in a
single rack, achieving a footprint of only 590 (W) x 2,000 (H) x 1,000 (D)mm, one of the smallest in the
world.
The latest in digital broadcasting technology
Powe r A mplif ier s (PA )
Our newly developed high-power TRPA, the UA4000QE, utilizes the latest high-power LDMOS.
The output power of this TRPA is 1kW average. It features an excellent broadband matching circuit in
the amplifier modules.
• Size 479 (W) x 105 (H) x 630 (D)mm
• Internal power supply
• Can easily be replaced during operation
• Monitoring and remote control
The compact PA modules each incorporate an RS-485 interface, enabling comprehensive monitoring
and remote control. Furthermore, self-protection circuits for high temperature, reflected power,
overvoltage, overcurrent and low AC voltage are built-in.
UA4000QE
Wid eband design cove r s e n t i r e U H F b a n d
Frequency-agile, so no channel-specific components are necessary.
■ Exciter
The DM-3000A digital exciter is packed with NEC’s state-of-the-art technologies. The integration of
numerous functions into a single unit greatly reduces size and cost. A synthesizer tuned to all UHFband signals enables all-band direct conversion to an RF output. Higher or lower bit rates are modified
to usable bit rates for flexible bit-rate adaptability. Using the MIR created by the SFN adapter, seamless
ASI switching can be performed. The truly impressive characteristic of the DM-3000A is its ability to
work in conjunction with other NEC transmitters as a signal processor — this greatly reduces the
necessity for spare units while simplifying maintenance.
DM-3000A
■ Adaptive Digital Corrector (ADC) (optional)
The ADC board 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
board is installable from the front of the exciter and can be used to generate the correction factor for
preset correction. Furthermore, the ADC board is capable of analyzing feedback signals from the TX
output, including intermodulation level, MER value and other graphical data. And automatic adjustment
of the IMP/MER values greatly reduces the time required for maintenance.
Removable ADC board
(optional)
■ N+1 System
The Versatile III Series DTU-52’s frequency-agile design allows for the construction of an N+1 system,
offering redundancy for maximized reliability and uptime. By using the newly developed N+1
controller, up to 8+1 system is available.
At any given site, 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 with broadcast signals.
■ Liquid Cooling
The liquid cooling system incorporates an automatic air-purge function, and an Adaptive Fault Forecast
function. These features work together to cut noise and installation costs, make maintenance easier
and boost reliability. Coolant feeding and dust removal have been greatly simplified by a hybrid closed
circuit, ensuring the coolant remains clean.
Liquid Cooling System (Single with redundancy)
Fan 1
M
Fan 2
M
Fan 3
M
Heat Exchanger
Passive Reserve
(Reserve)
LS
TS
TS
Water/
Water/
Glycol
glycol
FM
PS
PA
Pump
A
PA
PA
Pump
B
PA
Passive Reserve
Transmitter
Pump Rack
FM: Flowmeter
LS: Level Switch
M: Motor
PS: Pressure Switch
TS: Thermal Switch
Remo te C ont r ol/Mon i t o r i n g
The easy-to-view color LCD screen located on the front of the rack features an intuitive GUI (Graphical
User Interface), making transmitter control, monitoring and maintenance extremely easy to perform.
For monitoring and control capabilities of a single or multiple transmitters from different locations, NEC
offers SNMP and Web server.
TCP/IP
PC
Sample View of Signal Quality Monitoring
IP
Network
DTU-52 Series Transmitter
C on fig ur at ion of D T U - 5 2 ( L i q u i d - c o o l e d ) S e r i e s
D TU -52 S e r i e s L i n e u p
DTU-52/ 1 2 3
1
2
: Output Power
Type
R9
1R8
2R7
3R6
4R4
5R3
6R2
7R0
7R8
8R7
10R0
Output Power
900W
1.8kW
2.7kW
3.6kW
4.4kW
5.3kW
6.2kW
7.0kW
7.8kW
8.7kW
10.0kW
: System Type
S: Single Transmitter with Single Drive
P: Single Transmitter with Dual Drive and Multiple PAs
PE: Single Transmitter with Dual Drive and Single PA
3
: Cooling Type
Q: Liquid Cooling
Transmi t t e r S t a n d a r d Co n f igurati on
S Type
Exciter
Adaptive
Digital
Corrector
Local
OSC
RF
Converter
TRPA 1
PS
n-Combiner
OFDM
Encoding
n-Divider
TS Input 1
TS Input 2
TRPA 2
TRPA n
External Reference Input
Control
Remote Control/
SYS.CONT
AC Input
BPF
(Option)
Output
Status
Pump Rack
& H.EXC
TX CONT
LCD Display
P Type
Local
OSC
RF
Converter
PS
External Reference Input
TS Input 1
TS Input 2
TRPA 1
n-Combiner
Exciter 1
Adaptive
Digital
Corrector
Exciter Switch
OFDM
Encoding
n-Divider
TS Input 1
TS Input 2
TRPA 2
TRPA n
BPF
(Option)
Output
Exciter 2
Control
Remote Control/
SYS.CONT
AC Input
Status
TX CONT
LCD Display
Pump Rack
& H.EXC
Transmi t t e r S t a n d a r d Co n f igurati on Tabl e
Output
900W
1.8kW
2.7kW
3.6kW
4.4kW
5.3kW
6.2kW
7.0kW
7.8kW
8.7kW
10.0kW
Model Name
DTU-52/R9SQ
DTU-52/R9PEQ
DTU-52/1R8SQ
DTU-52/1R8PQ
DTU-52/2R7SQ
DTU-52/2R7PQ
DTU-52/3R6SQ
DTU-52/3R6PQ
DTU-52/4R4SQ
DTU-52/4R4PQ
DTU-52/5R3SQ
DTU-52/5R3PQ
DTU-52/6R2SQ
DTU-52/6R2PQ
DTU-52/7R0SQ
DTU-52/7R0PQ
DTU-52/7R8SQ
DTU-52/7R8PQ
DTU-52/8R7SQ
DTU-52/8R7PQ
DTU-52/10R0SQ
DTU-52/10R0PQ
Equipment Composition (Sets)
Transmitter
Exciter Exciter Switch PA Divider/Combiner TX Control
1
2
1
2
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
2
3
4
5
6
7
8
9
10
12
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
Rack
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
Size　(mm)
590(W) x 2,000(H) x 1,000(D)
1,180(W) x 2,000(H) x 1,000(D)
Weight
359
367
407
415
447
455
487
495
528
536
568
576
608
616
649
657
690
698
730
738
1,166
1,174
E xte rnal View
*Drawings are for P type. For S type, the exciter will be one set.
EXCITER-A
EXCITER-A
EXCITER-A
EXCITER-B
EXCITER-B
EXCITER-B
EXCITER-B
TX CONT
TX CONT
TX CONT
TX CONT
DTU-52/R9PEQ
DTU-52/1R8PQ
EXCITER-A
EXCITER-A
DTU-52/3R6PQ
EXCITER-A
EXCITER-A
EXCITER-B
EXCITER-B
EXCITER-B
EXCITER-B
TX CONT
TX CONT
TX CONT
TX CONT
DTU-52/4R4PQ
DTU-52/5R3PQ
EXCITER-A
DTU-52/7R8PQ
DTU-52/2R7PQ
EXCITER-A
DTU-52/6R2PQ
EXCITER-A
EXCITER-A
EXCITER-B
EXCITER-B
EXCITER-B
TX CONT
TX CONT
DTU-52/8R7PQ
DTU-52/7R0PQ
TX CONT
DTU-52/10R0PQ
S pecif ication s a n d Pe r f o r ma n c e
DTU-52 (Liquid-cooled) Series
Specifications
Output Power
Output Frequency
Output Impedance
Input Signal
Power Supply Voltage
Voltage Fluctuation
Power Supply Frequency
Ambient Temperature
Relative Humidity Standard Performance
Frequency Stability
Amplitude-frequency Response
Intermodulation Products MER (Modulation Error Ratio)
Spurious
900W ~ 10kW
470 ~ 862MHz (Band IV/V)
50Ω
DVB-ASI
380/400/415V, 3-phase, 4-wire
+10%, -15%
50/60Hz±2%
Indoors: 0°C ~ +45°C
Outdoors: 0°C ~ +45°C or
-30°C ~ +40°C (using antifreeze and 3-way valve system)
<
= 90% (no condensation)
<
=
±1 X 10-7 (internal reference use)
(it is also possible to lock to an external 10MHz reference)
<
= ±0.5dB (excluding BPF)
<
= -36dB
>
= 32dB
<
= -60dBc
Specifications, designs, etc. are subject to change without notice.For further information, please contact:
1EC Australia Pty. Ltd.
Broadcasting Systems
649-655 Springvale Road,
Mulgrave, Victoria 3170, Australia
Tel: +61 (0)3 9262-1111 Fax: +61 (0)3 9264-3507
DX.QHFFRP
Cat. No. BBV064 1st 0808
08080000KK
Printed in Japan
©NEC Corporation 2008