R&S®NW7000 (DVB-T) VHF Solid-State TV Transmitters

  • Overview

Key Facts

  • DVB-T coding and modulation according to EN300744
  • IFFT mode: 2k and 8k
  • Useful symbol period: 224 µs (2k) or 896 µs (8k)
  • Modulation: QPSK, 16QAM or 64QAM

Features

  • Power amplifiers
  • Central control unit
  • Transmitter rack

Key Facts

  • DVB-T coding and modulation according to EN300744
  • IFFT mode: 2k and 8k
  • Useful symbol period: 224 µs (2k) or 896 µs (8k)
  • Modulation: QPSK, 16QAM or 64QAM
  • Guard interval: 1/4, 1/8, 1/16 or 1/32 of useful symbol period
  • Inner code rate: 1/2, 2/3, 3/4, 5/6 or 7/8
  • Hierarchical coding: option on request

Features & Benefits

  • The transmitters with a maximum output power of 3.6 kW for DVB-T or 5.8 kW for ATSC are accommodated in a rack 630 mm in width. This means space requirements are at a minimum since also components such as the harmonics filter, the vision/sound diplexer and the colour subcarrier trap for analog TV are accommodated in the transmitter rack. The bandpass filter for DVB-T or ATSC application is mounted outside the transmitter rack. To obtain higher power further racks fitted with the necessary amplifier plug-ins and couplers are required.

    Thanks to MOSFET technology, the power amplifiers feature high linearity, excellent efficiency and compact design. The power supply is integrated into the amplifier module, which is an enclosed unit. There is practically no heat dissipated in the rack since the air circulates within the amplifier module by means of a radial blower and the residual heat is conveyed to the cooling system via a heat exchanger.

    The new exciter comprises the following modules:

    The central control unit accommodated in the exciter rack ensures control and monitoring of the whole transmitter. This central control unit enables the user to access the parameters of the whole system, in particular those of the integrated encoders, via the control panel. In this way, only one remote control interface is required to monitor all functional units of the transmitter.

    The encoder for DVB-T is integrated in a single module. It has four physical ASI interfaces which in pairs form a complete processing path (input interface, FEC and delay). The encoder is thus prepared for hierarchical modulation. For non-hierarchical coding the two paths can be selected as a main and a standby path.

    All versions of the encoder transfer the digital inphase and quadrature signals with a resolution of 12 bit to the digital precorrector. The precorrector is divided in two sections:

    The connectors for modulation lines (TS), for example, as well as the remote control interface etc are located on the top of the transmitter rack.

    Protective circuits against reflection, overtemperature etc are provided. The junction temperature of the transistors is around 120°C under normal operating conditions and at an ambient temperature of 25°C.

    • Encoder for analog TV, DVB-T or ATSC

    The encoder can be used both in multifrequency networks and single-frequency networks. For single-frequency networks a GPS receiver is integrated.

    • The group-delay equalizer can compensate the group delay which occurs, for example, in power filters or vision/sound diplexers

    The connectors for the cooling system can be either on the top or bottom. The tubing used throughout the cooling system is of uniform cross-section to avoid different flow rates and thus blocking.

    • Digital precorrector
  • Central control unit
  • ATSC mode

    The ATSC encoder module comprises data randomizer, Reed-Solomon encoder, data interleaver, Trellis encoder, MUX and pilot insertion. Channel coding and modulation are in line with Doc. ATSC-A53.

    • The linearity precorrector can precorrect the instantaneous signal amplitude and phase
  • Transmitter rack
    • Modulator

    Since the precorrection is digital, the reproducibility is 100% even if modules are replaced.

  • Power amplifiers
    • Synthesizer
    • Controller
    • Control unit
    • Motherboard
    • Power supply

    A NICAM module and a GPS module can be installed as options.

    Since the modules are very compact, two complete exciters including the associated automatic switchover unit can be accommodated in a 19" mainframe of 7 height units. Each exciter has its own power supply so that full redundancy is ensured. The fully digital precorrection can be reproduced to the full. No adjustments are required after module replacement.

    The transmitter is operated with the aid of a PC software under Windows or via a display integrated into the control unit.

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