Transmitter Brochure - TRANSRADIO

ALL
UNDER ONE ROOF
TRANSRADIO – We have your Solution

CONTENT
DRM (Digital Radio Mondiale) – Radio goes future – we show IT ............4
❙ Overview of the DRM Solution ...............................................................5
❙ TRANSRADIO Rides on DRM Potential ...............................................6/7
❙ DRM – The Economical Way to reach your Listeners.............................8
❙ SFN – Extend the Coverage ....................................................................9
❙ Fraunhofer DRM ContentServer R4.............................................10/11
The new DRM DMOD3 – The All in One Solution....................................12
❙ Features..................................................................................................13
❙ Supported DRM Modes.........................................................................13
❙ Harddisk-free Design, VSWR Measurement ........................................14
❙ DRM Reserve and Fall Back Systems....................................................15
❙ Optimization of the DRM Spectrum ......................................................16
❙ Automatic Equalizer Adjustment – Speed up your Business..............17
TRAM Premium Line – Pure Efficiency in all Modes ...............................19
❙ TRAM Premium Line Highlights ......................................................20/21
❙ Paralleling Unit ......................................................................................22
❙ Riding the Longwave.............................................................................23
❙ Fraunhofer DT 700 DRM Monitoring Receiver......................................24
❙ Remote Control and Error Tracking via SNMP and HTML ...................25
AM Antennas from TRANSRADIO – Designed for DRM .........................26
Antenna Tuning Devices, Diplexer, ENW ................................................27
DRM Consulting – Ask the Experts...........................................................28
Turnkey-ready Solution from the Market leader......................................29
Technical Data DRM DMOD3....................................................................30
Ports and Connectors DRM DMOD3 ........................................................31
3

DRM (DIGITAL RADIO MONDIALE) –
Radio goes future – we show IT
The major advantage of LF, MF and HF broadcasting in the
frequency range below 30 MHz is the huge achievable
coverage. While all other technologies need an extensive network
with a high number of transmitters, AM broadcasting requires just
a few transmitters, providing a program to particular target groups
in a large geographical area. Because listeners were accustomed
to the high quality of VHF/FM broadcasting, upgrading AM with a
new technology was required to deliver the same high standards.
Implementing the digital broadcasting technology DRM gives
substantial improvements in audio and reception quality.
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Robustness in fading channels
Significant improvement in audio quality
Power savings at the transmitter site
Service related data (service labels, alternative frequencies and
language information)
Data services (pictures, text- and traffic information)
News Service Journaline TM
Optional Fraunhofer
DRM
ContentServer TM R4
MDI
data
Digital Radio Mondiale (DRM) is the name of the
international consortium, which defined the standards
for digitalisation of AM broadcasting. DRM was founded
in 1998 and developed a digital radio standard which is endorsed
by the IEC, ETSI and ITU. TRANSRADIO, formerly TELEFUNKEN
SenderSysteme Berlin, as a founding member of this consortium,
has tremendously influenced this standard with its experience and
knowledge in broadcasting. TRANSRADIO has established itself as
the leading DRM provider. Today TRANSRADIO has the highest
number of installed DRM transmitters in service.
Audio
4

OVERVIEW OF THE DRM SOLUTIONS
GPS-antenna or
external clock
TRAM TX1
RF drive
DRM DMOD3
ENV1
RF out
Paralleling
unit
Antenna
Antenna
RF
ENV2
TRAM TX2
RF out
RF drive
RF back
(directional
coupler)
Optional
Fraunhofer DRM
Monitoring Receiver
DT 700
RF back
5

TRANSRADIO RIDES ON DRM POTENTIAL
TRANSRADIO has
established itself as the
world’s leading DRM provider.
Today, TRANSRADIO has
the highest number of
installed DRM transmitters
in service.
DRM Medium Wave Transmitting Station
Cremlingen MW 800kW
MW transmitter
TRAM/P 800
Carrier power
of 800kW
(>400kW DRM)
in Cremlingen/
Braunschweig
(Germany)
Marnach MW 600kW
MW transmitter
TRAM/P 600
Carrier power
of 600kW
(>300kW DRM)
in Marnach
(Luxembourg)
Heusweiler MW 400kW
MW transmitter
TRAM/P 400
Carrier power of
400kW
(>200kW DRM)
in Heusweiler
(Germany)
6
Please find more references on our

DRM Long Wave Transmitting Station
Zehlendorf LW 500kW
LW transmitter
TRAM/P 500L
Carrier power
of 500kW
(>250kW DRM)
in Zehlendorf
(Germany)
Donebach LW 500kW
LW transmitter
TRAM/P 500L
Carrier power
of 500kW (>250
kW DRM)
in Donebach
(Germany)
Summerhill LW 300KW
LW transmitter TRAM 300L
Carrier power of 300kW
(>150 kW DRM)
in Summerhill (Ireland)
website www.transradio.de/references
7

DRM – THE ECONOMICAL WAY TO REACH YOUR LISTENERS
The DRM power is normally given as the
average power of the digital modulation.
Because of the high modulation peaks of
the DRM signal, the average power is
significantly lower than for the same
transmitter operating in the analog AM
mode. In general a DRM COFDM
waveform has a peak to average ratio
of about 10 dB. Thus a standard DRM
transmitter with a carrier power of
100kW and 100% modulation reaches a
peak power of 400kW. The DRM power
of such a transmitter is only 40 kW.
As a result, for the same coverage, up to
60% of the power can be saved running
an AM transmitter in DRM.
In contrast to standard transmitters,
TRANSRADIO’s TRAM family of transmitters
attain a DRM power of up to 73%
of their nominal power with all quality
requirements fulfilled: the MER value
is well above the minimum DRM
requirement and the out-of-band
emissions are considerably within the
DRM spectrum mask. This is possible
due to the overmodulation capability
of the TRAM transmitters and a
peak-to-average ratio reduction scheme
implemented in the DRM DMOD3.
Thus, TRANSRADIO’s TRAM family of
transmitters produce nearly two times
the DRM power compared to a standard
transmitter.
8

SFN – EXTEND THE COVERAGE
SFN-Berlin: 3 TRAM 10, 1485 kHz
A single frequency network (SFN) is
a radio network that operates several
transmitters on a single frequency and
has overlapping coverage areas. SFN’s
are an efficient method of extending
the coverage area without the need for
additional frequencies. Signals arriving
from transmitters outside the local transmitter
area can reinforce reception and
recover losses through local anomalous
propagation effects. Any receiver in the
coverage area of these transmitters will
receive the signal from more than one
transmitter. Different paths that arrive
from distant transmitters in the SFN
must arrive with a delay separation that
is less than the guard interval duration,
or otherwise inter-symbol interference
occurs. To avoid interference, each
station is run synchronously with the
others using GPS as a reference clock.
The built-in GPS receiver of the DRM
DMOD3 from TRANSRADIO is
implemented for single frequency
networks. Tests in the medium wave
band, conducted in cooperation with
MEDIA BROADCAST GmbH and in the
short wave band, in cooperation with
the DRM consortium demonstrated the
readiness of the DRM DMOD3 for all
types of SFN's.
9

OVERVIEW
FRAUNHOFER
DRM CONTENTSERVER R4
Optional Fraunhofer
DRM
ContentServer TM R4
MDI
data
Audio
Overview of the DRM ContentServer TM R4
GPS
The system has
3 major interfaces:
Audio
Data
DRM
AudioServer
DRM
Multimedia
DataServer
The Fraunhofer DRM ContentServer
R4 is designed to meet all the demands
of DRM broadcasters, DRM network
providers and DRM transmitter
operators with regard to DRM Multiplex
generation. The system is typically
located in the studio or a playout center
or at the transmitter site – with full
remote control for administration and
data provision. The Fraunhofer DRM
ContentServer R4 is based on robust
and redundant 19” server hardware for
reliable 24/7 operation.
The Fraunhofer DRM ContentServer
R4 provides triple functionality:
DRM Multiplex Generator
Config
Interface
FAC
SDC
MSC
MDI / DCP
Interface
Remote
Configuration/
Administration
DRM
Modulators
DRM Audio Server
With multi-stream real time audio
encoding
DRM Multimedia Data Server
Providing all standardized as well
as proprietary mechanisms for
data application import, preparation,
encoding and broadcast
DRM Multiplex Generator
Managing the extensive DRM
signalling capabilities, generating
the full digital DRM Multiplex and
providing standard MDI/DCP output
streams.
The system can easily be scaled to
match individual requirements and to
support proprietary data applications.
Configuration and Administration:
The system is designed to be administered
remotely using any modern HTML
browser. The system status is available
via remote HTML interface (including
detailed status information), automatic
e-mail report system, local status monitor,
relay board signalling and SNMP.
Audio and Data Input:
For audio input, the system supports up
to 4 digital AES/EBU or up to 4 analog
stereo signals. In addition, playlists and
mp3 files can be uploaded to the system
for offline audio encoding. Data for
multimedia applications can be provided
using a variety of standard protocols
(e.g. FTP, HTTP, RSS, UECP, Leitungsprotokoll,
Funkhaustelegramm). Powerful
mirroring features provide automatic
and scheduled data updates e.g. from
FTP, HTTP and RSS sources on the web.
DRM Multiplex Output via MDI/DCP:
The complete digital DRM multiplex
generated by the Fraunhofer DRM
ContentServer R4 can be fed
simultaneously to any number of DRM
modulators or monitoring stations for
multi-frequency or SFN broadcasts.
The output stream uses the standardized
MDI/DCP protocol supported by all
standard compliant DRM modulators
and monitoring equipment via UDP/IP
based or serial connections.
10

Features of the DRM ContentServer TM R4
Public Network
Content Contribution
Firewall /
Security
Protected Privat Network
Broadcast Distribution Chain
Administration
(Webbrowser)
Time sync
GPS, ntp
Audio 1-4 Streams
(live/playlist)
Data Application
DRM Text Messages
News Service Journaline
MOT Slideshow
MOT Broadcast Website
TPEG Traffic Information
EPG-Electronic Program
Guide
TOP News
TMC-Traffic Message
Channel
DRM Audio
Server
4 x (AAC, CELP,HVXC)
DRM Multimedia
Dataserver
TM
SNMP
DRM Multiplex
Generator
Analoge/ Email Relay Local status/
ISDN notification
Modem
card Config menu
System Status
MDI / DCP
Local / long distance
Any number of
simultaneous
outputs (SFN)
IP uni-/multicast
RS-232
11

THE NEW DRM DMOD3 - THE ALL IN ONE SOLUTION
12

OVERVIEW
DRM DMOD3
E
E
The aim of the new DRM DMOD3
is to offer highly automated
configuration procedures, maximum
reliability, low power consumption, low
heat dissipation and a compact and
ergonomic design. All broadcasting
modes are possible. The DRM DMOD3
offers easy and fast switchover facility
between analog AM, pure DRM, single
channel or multi channel simulcast.
Core features of the new DRM exciter
are the automatic equalizer adjustment
and the integrated antenna voltage
standing wave ratio (VSWR) measurement
capability, which offers a very
precise and fast method to set up
DRM equipment. The DRM DMOD3
is designed for mounting in standard
19” racks of 4U height.
It eliminates the requirement for a
separate RF processor and offers
a significant reduction in external wiring.
Low power consumption, reduced
operating temperature and a higher
MTBF have been achieved by
implementing notebook technology
components and a harddisk-free design.
New Features:
Operation modes
❙ Operation modes AM, DRM, SCS and
MCS
Fast switchover
❙ Fast switchover is accomplished in
less than 5 seconds between all
operation modes
Automatic Equalizer Adjustment
❙ Easy signal correction with automatic
equalizer adjustment
VSWR Measurement of the Antenna
Integrated RF Processor
❙ The DRM DMOD3 fits into a single
4RU Case
❙ Significant reduction of external wiring
Low Power Consumption
❙ Harddisk-free design
❙ Use of notebook components
Now all DRM-Modes fully supported!
Ergonomic Design
❙ Increased display size of 8.4”
❙ Provides a resolution of 800x600 for
easy readability
❙ Simple to operate without the need
of a external keyboard
Improved Reliability
❙ Harddisk-free design for better MTBF
❙ Wide ambient temperature range
up to 50 °C
Mode A Mode B Mode C Mode D
Nominal Bandwidth (9/10 kHz) ✔ ✔ ✔ ✔
Half Bandwidth (4.5/5 kHz) ✔ ✔ ✔ ✔
Double Bandwidth (18/20 kHz) ✔ ✔ ✔ ✔
64QAM MSC, all Code Rates ✔ ✔ ✔ ✔
16QAM MSC, all Code Rates ✔ ✔ ✔ ✔
16QAM SDC ✔ ✔ ✔ ✔
4QAM SDC ✔ ✔ ✔ ✔
Standard Modulation ✔ ✔ ✔ ✔
Hierarchical Modulation ✔ ✔ ✔ ✔
Equal Error Protection ✔ ✔ ✔ ✔
Unequal Error Protection ✔ ✔ ✔ ✔
Long/Short Interleaving ✔ ✔ ✔ ✔
✔ = supported
13

VSWR MEASUREMENT, HARDDISK-FREE DESIGN
Dual-flash storage architecture: Safe like a safe
Harddisk-Free Memory Architecture
The new memory architecture of the DRM
DMOD3 offers maximum reliability due
to the harddisk-free design. All necessary
data to boot up and to run the DMOD3
are stored on a static permanent storage
(flash1), which has read only access.
Inessential dynamic data for logging
and configuration, which are written
occasionally, are stored on a second
flash memory (flash 2). This separation
of the essential and inessential data
on two flash storage devices was made
to increase the reliability of the
architecture, since the likelihood of
failure of a flash memory is determined
mainly by the number of write cycles.
Example of an Antenna VSWR
VSWR Measurement
of the Antenna
The DRM broadcast must be compliant
with the ITU spectrum mask and
requires low antenna VSWR. The DRM
DMOD3 is capable of measuring the
VSWR of the antenna during DRM
operation and to show the result on the
screen. This enables the broadcaster to
monitor antenna matching during
regular operation without additional
measuring equipment.
Furthermore the DRM spectrum is measured
and is visualized by the integrated
DRM DMOD3 web server.
Mandatory
- Read only
Static permanent
storage
Startup
Programs
Permanent config
Flash1
Dynamic permanent
storage
Inessential
for normal
operation
Log files
Dynamic
configuration
Flash2
Data Processing
Memory Architecture
Dynamic volatile
storage
Temporary data
Fast logging
RAM
Disk
14

DRM RESERVE AND FALL BACK SYSTEMS
Active DRM Reserve
MDI
DRM DMOD3 -A
The active DRM reserve offers a
maximum of reliability for a DRM
system. Two DRM exciters supervise
each other during normal operation.
In the unlikely event of failure of
one DRM exciter, the remaining
exciter takes over the service and
keeps the transmitter(s) on air.
In an active reserve, double
exciter system the test points of
the transmitter(s) are switched as well.
MDI
Audio
Audio
Supervision
Link
RF, Envelope
Control
Unit
RF, Envelope
TX
Antenna
DRM Exciter
Fall-Back Solution
The exciter fall-back solution gives
the opportunity to fall back from
DRM transmission to AM, DAM or
AMC modulation in the unlikely
event of failure of the digital exciter.
In fall back mode the audio signal
bypasses the digital exciter.
The internal synthesizer of the transmitter
provides the RF signal and the
transmitter is kept on air by means of
the internal AM modulator.
MDI
Audio
DRM DMOD3 TX Antenna
RF
Envelope
Audio
Control Unit
RF from
TX-Synthesizer
RF
Envelope
Audio
Combination of Active DRM Reserve and DRM Exciter Fall-Back
In order to further increase the reliability of the DRM system, the Active DRM Reserve and the Exciter Fall-Back Solution can be
combined. In the unlikely case of the failure of both DRM exciters the internal synthesizer of the transmitter provides the RF signal.
15

OPTIMIZATION
OF THE DRM SPECTRUM
The DRM DMOD3 provides automatic functions to pre-equalize the transmitted signal in order to minimize the out-of-band emissions.
The aim of the pre-equalization process is to reduce the influence of linear and non-linear distortions on the DRM signal.
The following pre-equalization functions are supported by the DRM DMOD3:
Optimisation Process
AM/AM AM/PM H (j) , DC
Compensation of
Non-linear Distortion I
Compensation of
Non-linear Distortion II
Compensation of
Linear Distortions
Adjustment of the Time
Delay and the DC Offset
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❙
Measurement of the
amplifier characteristic
(AM/AM characteristic)
Calculation of a
correction curve
Pre-equalization of the
transmission signal
❙
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❙
Measurement of the
incident phase
modulation (AM/PM
characteristic)
Calculation of a
correction curve
Pre-equalization of the
transmission signal
❙
❙
Measurement of the
envelope frequency
response
Calculation of an
equalization filter to
compensate the
amplitude frequency
response and the group
delay distortions
❙
The DRM DMOD3
offers a sophisticated
algorithm for optimal
adjustments between
the delay differences
of the amplitude- and
phase signal as well
as the DC offset.
❙
Pre-equalization of the
transmission signal
16

SPEED UP YOUR BUSINESS
One Button Automatic Equalizer Adjustment
Broadcast operators demand an automated
configuration procedure for
DRM equipment and the DRM DMOD3 is
the answer. The DRM DMOD3 provides
automated functions to pre-equalize
the transmit signal in order to reduce
out-of-band emissions. The equalizer
adjustment can be performed
automatically just by the push of a
button.
The DRM DMOD3 auto-adjust of the
equalizer offers:
❙ Automatic initial equalizer adjustment
❙ Equalizer optimization during DRM
operation
❙ Adaptive equalization
❙
❙
Automatic switching of up to three
different test points
Crucial parameters like time delay,
DC offset and envelope frequency
response are optimized in order to
minimize out-of-band emissions
DRM DMOD3
MDI
MDI Decoder
&
OFDM Generator
I,Q
Equalizer
I-Q
to
A-Phi
Conversion
Phi
A
Delay
Adjustment
Envelope
Filter
Upsampling
&
RF-Output
Phase
modulated
RF
Envelope
TX
A-Phi
Delay
Filter
Coefficients
DC-Offset
DRM DMOD3
Auto - Adjust
Test
Point 1
RF-Input
&
Downsampling
Measuring Point
Switching device
Test
Point 2
Test
Point 3
Block Diagram of the Automatic Equalizer Adjustment
17

TRAM PREMIUM LINE – PURE EFFICIENCY IN ALL MODES
18
TRAM 10 TRAM 50
TRAM 100

OVERVIEW
TRAM TX1
TRAM TX2
Many years of experience in the
field of high power transmitters in
conjunction with the latest state of the
art transistor technology has paved the
way for a future oriented and meanwhile
well established solid state transmitter
concept. As opposed to conventional
transmitters the simple modular system
of solid state medium wave transmitters
from TRANSRADIO offers a maximum
of flexibility and unsurpassed audio
quality. The TRAM Premium line based
on the new developed power modules
secures optimized DRM parameter while
achieving an outstanding overall
efficiency in all operation modes.
The TRAM Premium Line –
optimized for DRM Transmission
All TRAM Premium line transmitters are
optimized for digital transmission and
exceed the DRM recommendations.
The layout, in standard 19" racks, allows
for easy and comfortable access to all
components and modules and results
in exceptionally low space requirement
for the respective power classes.
The power amplifier stage offers true
modular redundancy through the use of
standardized 1 kW amplifier modules.
Each individual module is equipped with
an on-board PDM modulator and no
quantization problems occur. Designed
with a high power reserve capability,
each module provides full signal quality
on its own.
TRAM 400
19

TRAM PREMIUM LINE HIGHLIGHTS
TRANSRADIO
TRAM-transmitters, prefered models
Type
No. of 50kW- Power blocks
No. of identical power modules
No. of driver modules
Output power (other power classes on request)*)
Frequency range
LW
MW
Operation modes
RF Output
Modulation system
AF range
Connector
Load impedance
VSWR
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❙
❙
❙
❙
❙
❙
❙
❙
❙
Outstanding efficiency and excellent performance
data
≥125 % positive peak programme capability
DAM operating mode for further energy saving
(standard for all models, DCC by jumper setting)
Compact and service-friendly design, extremely
low space requirement
Modular design of the power amplifiers: standard
1 kW plug-in power module, broadband over the
whole MF range, no tuning of the modules is
required. Integrated supervision and protection
circuits are standard features.
All transmitters are exclusively air-cooled utilising
a unique internal air-flow system. Recycled air
cooling by means of air-water heat exchangers
available.
Factory fitted and tuned to the desired operating
frequency.
Rugged construction with emphasis placed on high
mechanical strength and stability.
Combining stand alone transmitters by utilising an
innovative paralleling unit (PU). No need for a highpower
reject load.
TRAM Premium line transmitters are also available
as long wave broadcast transmitters (150 to 300
kHz) and long wave communication transmitters
(14 to 148 KHz)
All TRAM Premium line transmitters are optimized
for digital modulation techniques such as DRM.
TRAM – Essentials at a Glance
LW communication transmitters:
LW broadcast transmitters:
MW broadcast transmitters:
Output power range:
AF Frequency response
AF harmonic Distortion (THD)
Modulation capability
Carrier shift (amplitude drop)
RF harmonics and spurious emissions
Signal to noise ratio
Frequency stability
AF Input
Power supply
Voltage
Frequency
Voltage variations
Power factor
Power consumption m = 0
m = 1
Overall efficiency**)
Control
Local
Environmental
conditions
Cooling system
Dimensions [mm]
(LW TXs require more filter racks)
Remote
Temperature
Relative humidity
Installation altitude
Width
Depth
Height
14 kHz to 148 kHz
150kHz to 300kHz
525 kHz to 1710 kHz
stand-alone version 5kW to 600 kW
combined up to 2000 kW
20

AM TRANSMITTERS – A SECURE INVESTMENT INTO THE FUTURE
TRAM 5 TRAM 10 TRAM 25 TRAM 50 TRAM 100 TRAM 200 TRAM 300 TRAM 400 TRAM 500 TRAM 600
1 2 4 6 8 10 12
5 10 24 48 96 192 288 384 480 576
– – 1 1 2 4 6 8 10 12
5 kW 10 kW 25 kW 50 kW 100 kW 200 kW 300 kW 400 kW 500 kW 600 kW
150 kHz to 300 kHz
525 kHz to 1710 kHz
Factory fitted and tuned to the determined operating frequency
Components for change to other frequencies on request
AM (A3E) – AM reduced power P/4 – DAM (X3E), i.e. dynamic carrier control – AM stereo capability, prepared for DRM
7/8“ EIA 1 5/8“ EIA 3 1/8“ EIA 4 1/2“ EIA 6 1/8“ EIA 9“ EIA
50 unbalanced
VSWR 1.3 tuneable, automatic power reduction as a result of increasing VSWR during operation
Pulse Duration Modulation (PDM)
30 Hz to 10 kHz
Changeover between a maximum of 2 band limiting filters on request
0.5 dB, 30 Hz to 10 kHz, with band limiting filters switched off
1% at m = 0,8
100% continuously, + 125% peak programme capability
1% with voltage regulation
Standard: according to ITU-R SM 329 or better ( 50mW), FCC requirements on request
60 dB referred to 100% Modulation
Deviation 5Hz, external synchronisation of synthesizer possible
600 balanced (can be changed inside the unit by jumper to 2000 )
Adjustable from –10dBm to +10dBm referred to 100% modulation, switched coarse increments (5dB), fine adjustment by potentiometer
Standard mains configuration: 3 N 400V;TN-S or TN-C, other voltages on request, TRAM 200 or higher MV supply preferred
50Hz (60 Hz on request)
5% with full performance; ± 10% with minor performance degradation
0.9 0.95
6.7 kW 12.2 kW 29,8 kW 57,5 kW 114,9 kW 229,9 kW 344,8 kW 459,8 kW 574,7 kW 689,7 kW
10,0 kW 18.3 kW 44,6 kW 86,2 kW 172,4 kW 344,8 kW 517,2 kW 689,7 kW 862,1 kW 1034,5 kW
> 75% > 82% > 84% 87%
OFF/ON, full power/on, reduced power(P/n) – AM/DAM – selection local/remote
Changeover between 2 AF band limiting filters – various status indications by LED
Command input by floating contacts, same commands as for local control, indications by floating contacts
RS 232 standard and BIT BUS, SNMP, HTML optional
Standard: –10 °C to +50°C, other environmental temperatures on request
maximum 95%, non-condensing
Standard: maximum 2000 m, higher altitudes on request
Air cooling (intake air from the room, exhaust air to the room, air duct system with blowers on request)
600 600 1200 1800 3000 4800 6000 9600 10800 12000
1000 1000 1000 1000 1000 1000 1000 1000 1000 1000
2000 2000 2000 2000 2000 2500 2500 2500 2500 2500
*) All other power ranges on request **) with standard cooling
TRANSRADIO – RF and Power are our Strength
21

PARALLELING UNIT
The paralleling unit (PU) serves to
combine two single transmitters to
double the output power. Furthermore,
it provides an active redundancy system
to avoid a loss of transmission during
maintenance schedules.
The PU equipment contains a central
control unit, a combining network and
a compact balancing resistor.
The load regulation of the central control
unit ensures that both transmitters are
levelled automatically to equal RF output
powers and a minimum of power is
lost on the balancing resistor. In the
unlikely event of failure of one of the
transmitters, a motorised RF switch will
automatically switch the unaffected
transmitter directly to the antenna and
the faulty transmitter to a dummy load.
The transmission continues and the
faulty transmitter can be repaired whilst
connected to the dummy load.
OVERVIEW
RFout
Paralleling
unit
A
RFbac
(direct
couple
PU Control Unit
22

RIDING THE LONGWAVE
Long Wave Transmitter
TRAM/P 500L (500kW)
from TRANSRADIO
in Zehlendorf
Longwave is well known for excellent
ground wave coverage hence, offering a
stable reception. DRM on LW combines
the advantages of digital transmission
with very good longwave propagation.
On the other hand, narrow band
longwave antennas with considerable
mismatch even inside the transmission
bandwidth are posing a big challenge to
the broadcast industry. TRANSRADIO
has accepted this challenge and has
successfully modernized several LW
transmission stations with its DRM
solution. The DRM installation on LW
needs completely to fulfill the
requirements concerning the out-ofband
emissionsof ETSI EN 302 245-1 and
ITU SM.1541. Therefore, TRANSRADIO
implements an Extension Network
(ENW) to eliminate the disadvantages of
the asymmetrical antenna impedance
and to reduce mismatch. This results in
a reduction of the standing wave ratio
and a significant mask reserve. A world
premier was achieved when the
TRANSRADIO transmitter in Zehlendorf
(Germany) broadcast for the first time
DRM on long wave in accordance with
the ETSI/ITU standard. Since then
TRANSRADIO reconfirmed impressively
its leading position with respect to LW
and has modernized LW transmitting
stations, for example, in Donebach,
Aholming (Germany) and Summerhill
(Ireland).
Spectrum of the transmitted Signal in Zehlendorf
Burg
Mainflingen
Kalundborg, DK
Long Wave-Antenna
in Zehlendorf (360m)
Burg, Mainflingen and Kalundborg are Signals received from other Stations
23

OVERVIEW
FRAUNHOFER DT 700
DRM MONITORING RECEIVER
rive
(directional
coupler) Optional
Fraunhofer DRM
Monitoring Receive
DT 700
Concept
The DRM Monitoring Receiver DT 700
is a professional monitoring receiver
perfectly suited for DRM reception and
transmitter monitoring. It features
a high performance front-end based on
the latest direct sampling reception
technology. Together with a 12-band
fix-tuned preselector filter bank, the
DRM Monitoring Receiver DT 700
guarantees an outstanding reception
performance and low phase noise.
The receiver's signal processing is based
on a Software Defined Radio (SDR)
construction. Its core is an embedded
Linux PC. The latter features an easy
software update via built-in DVD drive.
The highly reliable hardware is built
for 24/7 continuous operation as is
necessary for a professional broadcast
environment. Based on the embedded
Linux platform a web server allows easy
remote access to all of the receiver's
control functions. The DRM Monitoring
Receiver DT 700 is available with two
different reference oscillator accuracies –
standard oscillator (5ppm, Option B1) or
high precision OCXO (

REMOTE CONTROL AND ERROR TRACKING VIA SNMP AND HTML
TRAMtransmitter
SMS-messages
Ethernet
Client with
standardwebbrowser
SNMPmanagement
system
Ethernet
Interface
Card
ISDN/
PSTN
router
Mailserver
NTP-server for
time-synchronisation
This function gives broadcast operators
the freedom to control their equipment
from any place in the world. Each
individual transmitter or paralleling unit
(PU) is optionally accessible via SNMP
and HTML. The network access can be
via dial-in (PSTN, ISDN) or Ethernet
connection (TCP/IP). The web server
and the SNMP MIBs (management
information base) offer all necessary
functions to remotely control
the transmitter and display failure
messages.
SNMP
As a result of standardized SNMP-MIB
implementation, the SNMP functions
can be seamlessly integrated in a SNMP
management system. If a failure occurs,
traps are sent by the SNMP agent. SNMP
traps can be collected and presented by
a central management system.
Also transmitter parameters can be
modified via set commands. In addition,
SMS messages and emails can be sent
to the operator and the clock can be
synchronized by an NTP-server.
Web Access
via HTML
Based on a
web server,
all necessary
functions of
a transmitter
system can be
monitored and
controlled by
a standard
browser – no
proprietary
software is
required.
Standardized SNMP-MIB
of a TRAM Transmitter
Webinterface of a TRAM Transmitter
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AM ANTENNAS FROM TRANSRADIO – DESIGNED FOR DRM
TRANSRADIO is
dedicated to the design
and development of AM
antennas and related
systems for broadcasters
and to provide consultation
to adapt and improve existing
AM antennas especially for DRM.
High quality DRM transmission
without violating the specified
spectrum mask requires high demands
on antenna systems.
In particular, broad impedance bandwidth
is needed as well as symmetric characteristics
of impedance related to the carrier frequency.
TRANSRADIO stays at the forefront of the
latest DRM technologies through innovative
solutions to technical challenges.
Horizontal Cross Dipole
Antenna for MW Broadcasting
in Mainflingen (Germany)
Our product portfolio
includes:
❙ Directional and omni-directional antennas
❙ Antenna tuning devices including
(diplexers, triplexers, quadplexers,
filters …)
❙ Extension Networks (ENW)
❙ Antenna switching matrix’s
❙ RF feed lines
❙ Dummy loads (air-cooled,
water-cooled)
❙ Optimisation of existing antenna
designs especially to improve
bandwidth and static grounding
of all antenna parts
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Computer Model of the Cross
Dipole Antenna Mainflingen
Vertical Pattern
of Cross Dipole Antenna
for Suspension Height
of 0.4 Lambda

OVERVIEW
ling
Antenna
Antenna
RFback
Antenna Tuning Unit (ATU)
in Szolnok (Hungary)
Extension Network
(ENW) in Donebach
(Germany)
The Extension Network
is the Key
The quality of the DRM signal in the
coverage area depends significantly
on a well designed antenna system.
Bandwidth and radiation characteristics
are important criteria for good
performance when choosing an antenna
type. Years of experience with industry
standard tools has given us the
capability to design all types of
antennas.
In order to adapt existing AM antennas
especially for DRM, narrow band AM
antennas with considerable mismatch
even inside the transmission bandwidth
are posing a big challenge to the
broadcast industry. TRANSRADIO has
accepted this challenge and modernises
AM transmitting stations for DRM
according to the requirements with
respect to the out-of-band emissions
of ETSI EN 302 245-1 and ITU SM.1541.
The key to fulfill the requirements
is the Extension Network (ENW).
The ENW is implemented to eliminate
the disadvantages of the asymmetrical
antenna impedance and to reduce
mismatch.
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DRM CONSULTING – ASK THE EXPERTS
DRM Upgrade Kits
Many broadcasters still use transmitters
built in the 1970s and 1980s. Securing
investments is an important issue for
broadcasters. Therefore an increasing
number of broadcasters made the
decision to upgrade their transmitters
with DRM exciters. TRANSRADIO
delivers the solutions to upgrade these
systems with DRM exciters and offers
site surveys to define the best upgrade
solution. The TRANSRADIO DRM
exciters have not only proved their
compatibility to transmitters built by
TRANSRADIO but also their ability to
operate with transmitters from other
manufactures.
DRM Antenna Tuning
TRANSRADIO provides consulting to
develop complete AM antenna systems
and to deliver, adapt and improve
AM antennas especially for DRM.
In general, TRANSRADIO employs
Extension Networks (ENW) in order
to reduce unwanted phase modulation
in the antenna and the mismatch of the
load. The transmitters have a maximum
of transmission quality because they
operate on a wide-band matched load.
DRM Planning
Guidance
The calculation of the necessary
DRM power of the transmitter depends
amongst other things on the ground
conductivity, the robustness of the
DRM mode, frequency and the required
electrical field strength.
The TRANSRADIO consultant service
provides the necessary information to
dimension your DRM system.
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TURNKEY-READY SOLUTION FROM THE MARKET LEADER
TRANSRADIO delivers custom-tailored
solutions to meet the needs of
broadcasters. Our professional service
encompasses the delivery of the
transmitter and the management of
turnkey-ready projects including all
facilities to operate a broadcasting
system.
Buildings
Containers
Overview of the
Professional Service
Transmitter
installation
Medium voltage
Low voltage
Antenna installation
Antenna tuning
Ventilation
Air-conditioning system
Fire detector systems
Emergency power supply
29

TECHNICAL DATA DRM DMOD3
Inputs for DRM Modulation Data
Inputs for Audio Signals for AM, DRM
or Simulcast Transmissions
Remote Control
Modulator
Supported DRM Modes
RF Signal
Amplitude Signal
Power Supply
Synchronization
❙ V.24/RS232 asynchronous serial port with MDI protocol
❙ 10/100/1000 Mbit Ethernet port for UDP data transfer using MDI protocol
❙ Standard XLR connectors for analog signals with normal line level
(+2dBV max.) at 10 kOhm
❙ Standard XLR connectors for AES/EBU digital audio input
❙ Toslink connectors for ADAT optical audio input
❙ V.24/RS232/Network connection with Bitbus syntax
❙ Graphical user interface over IP
❙ Web interface
❙ Industrial 19” 4U rack mountable; Linux OS
❙ Modes A, B, C and D with bandwidths of 4.5, 5, 9 and 10 kHz for
A/Phi transmitters; 18/20 kHz in addition for linear transmitters
❙ Error protection: EEP and UEP
❙ Standard and hierarchical modulation
❙ Direct-Digital-Synthesis signal generation
❙ Tuneable frequency range from 9 kHz to 26.1 MHz
❙ Output level 5 Vpp at 50 Ohm
❙ Sampling rate of 192 kHz
❙ Frequency range from 0 Hz to about 80 kHz
❙ Output level 2 Vpp at 600 Ohm
❙ 100 ... 240 V single phase
❙ integrated GPS synchronization
Environmental Conditions ❙ Temperature: –10 ... +50 °C
Humidity: 10 ... 80 % RH, non condensing
Fast Switchover
Other
❙ Fast switchover is accomplished in less than 5 seconds between all
available modes (DRM, AM, Simulcast …)
❙ RF input for measurement and equalization functions
with three selectable input connectors
30

PORTS AND CONNECTORS DRM DMOD3
Rear View DRM DMOD3
GPS
RS-232
Synchronisation
via GPS or
external clocks
RF
output
to TX
sin
and
square
RF input
probes
from TX
Envelope
output to TX
RS-232 serial ports
for remote control,
MDI data and UPS
Signalling
relays
Digital audio
inputs AES/EBU
Analog
audio inputs
Network
interface
ADAT digital
optical audio
USB
Mains
100-240V ~
31

TRANSRADIO
SenderSysteme Berlin AG
Mertensstraße 63
13587 Berlin
Germany
Phone: +49 30 33978-0
Fax: +49 30 33978-599
E-mail: info@tsb-ag.de
Internet: http://www.transradio.de
design: HUSS-MEDIEN GmbH
photos: Transradio SenderSysteme AG, Wolfgang Korall, Kluwe-Yorck
32