Screen SFT 251 U/XE Digital UHF TV Transmitter 250/300 W rms

Screen SFT 251 U/XE Digital UHF TV Transmitter 250/300 W rms

Ring for pris

Model/Varenr.: SR-SFT 251 U/XE

Screen SFT 251 U/XE

Digital TV Transmitters – Revolutionized.

The New FUTURE SFT/XE Series, with its extreme efficiency, is reaching the highest technology level in both TV Digital Signal Processing and RF domain.

The top performances of FUTURE SFT/XE Digital TV Transmitters are possible thanks to:


1) ARK-X: is the evolution of the ARK Series multistandard DTV Drivers, and meets or exceeds all the DTV International Broadcasters requirements.

The improvement of digital adaptive precorrection and configuration flexibility are the main benefits of this advanced product.




2) XET™ (eXtreme Efficiency Technology): the new Screen XET™ is the result of latest generation LDMOS devices (more rugged and efficient compared to the past), with a special low-loss design of matching and combining system, together with extremely high-efficiency power supplies, over 96% efficiency.

The XET™ Technology, applied to the amplifier section, grants up to 42% overall efficiency.


3) Compact-sized: the highest efficiency combined with a new concept of heat sync and ultracompact power supplies, grants the compact size of both amplifier modules with air cooling or liquid cooling systems, and the cooling system.

4) Easy and Fast maintenance: FUTURE SFT/XE SERIES has hot-pluggable RF power modules (both liquid and air cooled versions) for an easy bench testing and quick replacement on site.


All RF power modules are equipped with 3 independent power supplies for maximum redundancy and easy single phase or balanced three phases operation selection. These 3 power supplies are also hot pluggable themselves, for a unique way of smart maintenance.


The latest generation of industry higher class power supplies grants over 96% efficiency with wider input AC range capability and greater ruggedness.


5) Smart System Design: clean and easy to maintain system configuration both for liquid and air cooling equipment thanks to:

– latest generation progressive RF combiner
– with ultracompact unbalancing dummy loads and
– a smart intercommunication interface between RF modules, drivers, and Logical Control System


This new series of Digital TV Transmitter Screen XET™(eXtreme Efficiency Technology) grants RF efficiency over 50% and overall efficiency up to 42% without decreasing performance in terms of modulation error rate and shoulders and with the well-known reliability of Screen products.


The new XET™ Technology allows stunning performances for broadcasting: higher efficiency, compact-sized and cooling systems reduction are just some of the improvements gained.

The Digital TV Transmitters FUTURE SFT/XE feature a built-in SFN adapter and very advanced SWDT® (Software Defined Transmitters) technology, to implement different modulation patterns – either digital or analog – (DVB, ATSC, ISDB-T, DTMB, DAB, DAB+, T-DMB, ATV, etc.) in the same hardware.


Moreover, the SWDT® technology allows an easy selection of the operating modes:
– remotely, using a clean contact;
– via SNMP commands; via TCP/IP, using the Web graphic interface;
– or even via a dedicated command inserted into the transport stream.


Complete remote control of the transmitters can be made by serial protocols or TCP/IP ports, thanks to the internal Web server or built-in SNMP.

Nevertheless, the High Efficiency of this Digital TV Transmitter Series reduces management costs and helps the environment.

Main Specifications

Frequency range:

UHF (Band IV/V): 470 to 862 MHz, in 1 Hz Step

Available standards (all standars are full compliant)

Digital TV and Analog TV


Power Supply

AC Line Voltage: 380 to 415 (3 phases), 208 to 240 Delta or Star; 47 Hz to 63 Hz (specify at order)

AC Line variations: +/- 15%

Power factor: ≥ 0,98

Environmental Conditions

Altitude: 2500 m above sea level (> 2500 m on request)

Operating temperature range: -10°C to +45°C at sea level, upper limit derated of 2 °C per 300m over 1000 m above sea level

Relative humidity: 95 %, not-condensing

Cooling method: Forced Air with external heat exchanger with redundant pump and fan

RF output

Output power range: See selection table 

RF load impedance: 50 Ohm

VSWR: Power reduction after exceeding the set value or switch off after three attempts

RF Output connector: See selection table

Transmitter size

Rack Unit, Weight, Dimensions: See selection table


Reference frequency: 10 MHz, 0.1 V to 5 V (Vpp) or TTL, BNC

Reference pulse: 1pps (1 Hz, TTL, BNC)

Operations Control and Monitoring


Web based Interface


Telnet access via ethernet


Extensive front panel control (color display, keypad)

Local terminal on RS232 or LAN

USB for upgrade

Compliance and Conformity

RoHS: 2011/65/EC

Radio Equipment Directive (RED): 2014/53/EU

Safety: EN 60215

EMC: EN 301-4891-1 - ETSI EN 302 296-2 V1.2.1 (2011-05)

FCC: Part 74

WEEE: 2012/19/EU

Manufacturing: ISO 9001:2015

Selection Table

Model: Screen SFT 251 U/XE

Output band: UHF

Working Class: AB+C

Dimensions: 2 RU compact

N. Amplifiers: -

Output Connector: 7/16"

Cooling: Air

DVB, ISDB-T, DTMB W rms: 250

ATSC W rms: 300

Overall efficiency > 33 dB Mer: up to 36%

Shoulders (@ FO ± 3.5 MHz ATSC) or (@ FO ± 4.3 MHz DVB) or (@ FO ± 3.3 MHz ISDB-T): -36

Overall efficiency > 36 dB Mer: up to 34%

Shoulders (@ FO ± 3.5 MHz ATSC) or (@ FO ± 4.3 MHz DVB) or (@ FO ± 3.4 MHz ISDB-T): -39

Titel Type Størrelse Download
Screen-SFT-XE.pdf PDF 1.33MB Download
Screen-SFT-XE-Selection-Table.pdf PDF 61.15KB Download

Produktets tags

Der er ingen tags registreret.

Mine tags