Model: DTX1200U

Features

• 470 MHz - 860 MHz Broadband Transmitter/Repeater
• LDMOS Power Amplifier provides 120 Watt output for broadcast
of DVB-T/H, CMMB, DTMB, ATSC and ISDB-T/TB waveforms
• Linear and Non-linear Digital Pre-correction
• SFN and MFN support
• Touch screen display for real time user interface
• Remote control and self monitoring via Ethernet and RS485 interfaces
• Built in web server accessible through RJ45 connector with Internet Explorer
• Remotely manageable via SNMP
• GbE Transport Stream Input based on ProMPEG Cop 3
• Occupying only 3 RU of standard 19” cabinet space

Optional Feaures

• Integrated GPS Receiver
• Integrated DVB-S/S2 Receiver
• Integrated DVB-T/H Receiver
• Integrated ISDB-T/TB Receiver
• Adaptive Pre-correction

Description

The DTX 1200U is a compact, solid-state transmitter, designed for digital terrestrial television broadcasting over a UHF frequency range of 470 MHz to 860 MHz.
The DTX 1200U converts an input transport stream (MPEG-2 or CMMB Multiplex) to a COFDM or 8VSB modulated IF signal. The IF signal is then converted to an RF signal at the required transmit channel frequency within the UHF band. Finally, the RF signal is amplified to a digital average output power level of 120 Watts. The power level stability at the transmitter’s RF output is maintained by an internal automatic level control loop.
The transmitter’s operational parameters are monitored and controlled by an embedded system controller that can be accessed from the front panel touch screen LCD or by using one of the remote control interfaces (Ethernet, SNMP, USB or RS232).
With the addition of an integrated DVB-S/S2 Receiver, DVB-T/H Receiver or ISDB-T/TB Receiver, the DTX 1200U can be configured as a terrestrial repeater. The input data stream is received and re-broadcast as a COFDM or 8VSB waveform.
All of the transmitter’s components are enclosed in a standard 19” rack mount chassis, occupying only 3 “RU” of cabinet space. The transmitter is forced air cooled using two compact high performance fans, which are installed on the transmitter enclosure front panel.

The Universal Modulator receives the ASI or GbE (DVB-T/H mode only) transport stream, performs input data processing, generates a COFDM or 8VSB IF output and provides signal synchronization. The modulator also contains a pre-corrector module for both linear and non-linear output signal correction.

The Digital Upconverter with RF Output performs a direct digital upconversion from IF to the required RF channel frequency. The upconverter covers an entire UHF frequency range of 470 MHz to 860 MHz in steps of just 1 Hz.

The Power Amplifier (PA) is the final amplification stage for the transmitter’s output signal. The power amplifier is built using LD-MOS transistor technology, which provides high efficiency and excellent reliability. The PA employs its own microcontroller, which monitors the operation parameters of the PA, provides protection against abnormal operation conditions and communicates with the system controller.

The Output Coupler measures the forward and reverse output power levels and reports data to the PA Controller.

The System Controller monitors and controls the entire transmitter system and also provides local and remote interfaces for all the command and status functions.

The Linear and Non-linear Digital Pre-correctors are used to maximize the performance of the transmitter in which the modulator is installed.

The characteristics of the linear and non-linear pre-correction curves are set by means of an easy to use and highly intuitive graphical user interface: the UBS Corrector GUI software package (Windows compatible).

The DVB-S/S2 Receiver receives and demodulates a satellite signal and outputs an ASI transport stream.

The DVB-T/H Receiver receives and demodulates a terrestrial signal and outputs an ASI transport stream.