Data sheet Version 01.0004.00 January UHF Transmitter Family ¸NH/NV 7000 2005 Liquid-cooled transmitters for analog and digital TV (DVB-T or ATSC) ◆ Frequency range 470 MHz to ◆ Liquid-cooled ◆ Cost-effective installation 860 MHz ◆ High redundancy ◆ All standby concepts possible (single ◆ Advanced LDMOS1) technology for ◆ Highly compact for minimum space transmitter, active or passive output- power amplifi ers requirements stage standby, exciter standby) ◆ Digital precorrection 1) LDMOS = lateral diffused metal oxide silicon. TELECOMPONENTS NNH-NV7000_HP_en.inddH-NV7000_HP_en.indd 1 110.01.20050.01.2005 114:32:064:32:06 A new generation of transmitters At a glance Transmitter rack The TV Transmitter Family ¸NH/ The transmitters with a maximum out- NV 7000 from Rohde & Schwarz is a new put power of 10 kW for analog TV, 3.4 kW generation of liquid-cooled UHF trans- for DVB-T or 5.4 kW for ATSC are accom- mitters for analog and digital TV (DVB-T modated in a rack 630 mm in width. or ATSC). They consist of the following This means that space requirements are main components: at a minimum since components such as the harmonics fi lter, the vision/sound ◆ Exciter diplexer and the color subcarrier trap for ◆ Power amplifi ers incl. power supply analog TV are also accommodated in the ◆ Transmitter rack transmitter rack. The bandpass fi lter for DVB-T or ATSC is installed outside the The UHF transmitters are available for transmitter rack. To obtain higher pow- analog TV with powers of 3.5 kW to er, further racks fi tted with the neces- 40 kW and for DVB-T with powers of sary amplifi er plug-ins and couplers are 800 W to 6.4 kW or ATSC with 1.3 kW required. to 10.4 kW (higher power ratings on request). Each amplifi er has its own The connectors for modulation lines (VF, power supply that is integrated into the AF or TS), for example, as well as the amplifi er module and thus cooled by the remote control interface etc are located liquid cooling system. on the top of the transmitter rack. The amplifi er module is self-engaging and The connectors for the cooling system can be exchanged during operation with- can be either on the top or bottom of out any loss of liquid from the closed cool- the rack. The tubing used throughout ing system and without impairing the op- the cooling system is of uniform cross- eration of the other modules. section to avoid different fl ow rates and thus blocking. The power supplies are fed with AC sup- ply voltage, i.e. no auxiliary voltage sup- plies are required, which improves the availability of the transmitters. Parts exclusively made of stainless steel, alu- minum or plastic are used for the cooling system in the transmitter rack. All transmitters can be equipped with a second exciter and the associated auto- matic switchover unit, the two units be- ing integrated into the transmitter rack. TELECOMPONENTS 2 UHF Transmitter Family ¸NH/NV 7000 NNH-NV7000_HP_en.inddH-NV7000_HP_en.indd 2 110.01.20050.01.2005 114:32:104:32:10 Amplifier ¸VH602 ASI input Exciter A HP1 DVB-T or I I HP2 Digital I/Q RF ATSC LP1 Q precorrector Q modulator LP2 encoder dB ASI input Exciter B HP1 Built-in power supply I I HP2 DVB-T or Digital I/Q RF LP1 ATSC Q precorrector Q modulator LP2 encoder optional Harmonics Lightning filter protection Channel 2.5 kW (rms) filter 6 × ¸VH602 optional Block diagram of the 2.5 kW DVB-T transmitter or 4.1 kW ATSC transmitter Exciter The new exciter comprises the follow- ing modules: ◆ Encoder for analog TV, DVB-T or ATSC ◆ Digital precorrector ◆ Modulator ◆ Synthesizer ◆ Controller ◆ Control unit ◆ Motherboard ◆ Power supply A NICAM module and a GPS module can be installed as options. Power amplifi ers Since the modules are very compact, two complete exciters including the as- Owing to advanced LDMOS technology, Protective circuits against refl ection, sociated automatic switchover unit the power amplifi ers feature high lin- overtemperature etc are provided. The can be accommodated in a 19“ main- earity, excellent effi ciency and compact junction temperature of the transistors frame of seven height units. Each exciter design. The power supply is integrated is around 120 °C under normal operating has its own power supply so that full into the amplifi er module, which is an conditions and at an ambient tempera- redundancy is ensured. The fully digital enclosed unit. There is practically no ture of 25 °C. precorrection can be reproduced to the heat dissipated in the rack since the air full. No adjustments are required after circulates within the amplifi er module by module replacement. means of a radial fan and the residual heat is conveyed toTELECOMPONENTS the cooling system via a heat exchanger. UHF Transmitter Family ¸NH/NV 7000 3 NNH-NV7000_HP_en.inddH-NV7000_HP_en.indd 3 110.01.20050.01.2005 114:32:174:32:17 The transmitter is operated with the aid The encoder can be used both in Since precorrection is digital, the repro- of PC software under Windows or via a multi-frequency networks and sin- ducibility is 100 % even if modules are display integrated into the control unit. gle- frequen cy networks. For single- replaced. frequency networks, a GPS receiver is Analog mode integrated. Central control unit The encoder for analog TV fi rst digitizes The central control unit accommodated the video and audio input signals. The ATSC mode in the exciter rack controls and monitors processing of these signals in line with The ATSC encoder module comprises the entire transmitter. This central control the associated TV or color coding stan- data randomizer, Reed-Solomon unit enables the user to access the pa- dard is digital which provides high sta- encoder, data interleaver, Trellis rameters of the entire system, in particu- bility and easy correction. encoder, MUX and pilot insertion. lar those of the integrated encoders, via Channel coding and modulation are in the control panel. In this way, only one re- The encoder uses digital fi lters to convert line with Doc. ATSC-A53. mote control interface is required to moni- the processed video signal and the sound tor all functional units of the transmitter. subcarriers separately for signal display Equalizer with inphase and quadrature signal. All versions of the encoder transfer the digital inphase and quadrature signals Cooling system DVB-T mode with a resolution of 12 bit to the digital The encoder for DVB-T is integrated in a precorrector. The precorrector is divided The standard cooling system (as an ex- single module. It has four physical ASI into two sections: ternal unit outside the transmitter rack) interfaces that in pairs form a complete includes a pumping set for each trans- processing path (input interface, FEC and ◆ The group-delay equalizer can com- mitter rack. The pumping set consists of delay). The encoder is thus prepared for pensate the group delay that occurs, two pumps operating in series for full hierarchical modulation. For non-hierar- for example, in power fi lters or vision/ redundancy, a control unit and a mixer. chical coding, the two paths can be se- sound diplexers A cooler is installed outside the transmit- lected as a main and a standby path. ◆ The linearity precorrector can precor- ter room for each pumping set. The cool- rect the instantaneous signal ampli- er is fi tted with two fans operating in ac- tude and phase tive standby for redundancy. The cooling Block diagram of the cooling system agent used is AntifrogenN. TX CP2 VH7 VH8 CP3 Heat exchanger FH1 VR10 FH2 VH3 VH5 Pump 1 Pump 2 TG1 CP1 VH1 VH2 VH4 PI1 ST1 VH6 VH9 CP4 DV1 DV10 DV9 VH11 Expansion vessel Safety valve Liquid filter Pump Ball valve Drain valve PI1 Pressure manometer Air-vent valveTELECOMPONENTS3-way mixer TG1 Temperature sensor UHF Transmitter Family ¸NH/NV 7000 4 NNH-NV7000_HP_en.inddH-NV7000_HP_en.indd 4 110.01.20050.01.2005 114:32:244:32:24 Specifi cations Common data for ¸NH/NV 7000 Frequency range 470 MHz to 860 MHz Optional parallel remote control interface, Power supply 230 V/400 V ±15 %, 50 (60) Hz ±2 % fl oating, for messages and com- Max. installation altitude 2000 m above sea level mands; SNMP interface and/or (>2000 m on request) TCP/IP Web server Operating temperature range +1 °C to +45 °C Analog TV Outside temperature range –30 °C to +50 °C TV standards B, G, D, K, M, N, I Permissible relative air humidity 95 % Color transmission PAL, NTSC, SECAM Inputs Sound transmission dual-sound coding to IRT or FM single sound and NICAM 728 Analog TV 2 × video (BNC, 75 Ω), 2 × sound (–13 dB /–20 dB) (XLR, 3-contact) or FM single sound (–10 dB) DVB-T 2 × ASI (in pairs, prepared for hierar- DVB-T coding and modulation in line with chical modulation) EN 300744 ATSC 2 × SMPTE-310 (BNC, 75 Ω) IFFT mode 2k and 8k Interfaces Useful symbol period 224 µs (2k) or 896 µs (8k) RS-232-C at the front, operation of transmit- Modulation QPSK, 16QAM or 64QAM ter by means of graphical user inter- Guard interval 1/4, 1/8, 1/16 or 1/32 of useful face (GUI) from PC, D-Sub, female, symbol period 9-contact Inner code rate 1/2, 2/3, 3/4, 5/6 or 7/8 RS-485 for remote control of transmitter, at transmitter top, D-Sub, female, Hierarchical coding option on request 9-contact ATSC in line with Doc.