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          您现在的位置:国产精品视频二区不卡,中文字幕无线在线视频观看,亚洲av久播在线观看,手机看片av永久免费 > 视频/音频和电视测试 > 电视/视频信号发生器 > 高功率发射机Nx8600,低功率发射机XLx8000
           

          Output power of the R&S®XLx8000 UHF/VHF transposers1)
          Height units
          Frequency band DVB-T, DVB-T2,
          DVB-H, ISDB-T
          ISDB-TB, DTMB, 
          CMMB (RMS)
          ATSC, ATSC Mobile 
          DTV (RMS)
          ATV 
          (sync peak)
          DAB(+), 
          T-DMB (RMS)
          2 3 4
          UHF
            2 W 3 W    
            5 W 8 W 12 W    
            10 W 16 W 25 W    
            25 W 40 W 60 W    
            50 W 80 W 125 W    
            100 W 150 W 250 W    
          VHF
            25 W 40 W 60 W 30 W    
            50 W 80 W 125 W 60 W    
            100 W 150 W 250 W 125 W    
            250 W    

          Key Facts

          • UHF/VHF low-power transmitters for analog and digital TV and digital audio broadcasting
          • Retransmitter in multifrequency networks for DVB-T, DVB-T2 and DVB-H
          • Compact equipment of only two to four height units
          • Broadband precorrection for digital standards with set & go function
          • Simple conversion from analog to digital TV (without hardware modifications)
          • Top Rohde & Schwarz quality with excellent price/performance ratio
          • Features & Benefits

            • Flexible concept and wide range of applications
               
              • Compact solution
              • Convenient operation, on-site or remote diagnostics
              • Transposer in multifrequency networks
              • Retransmitter in multifrequency networks for DVB-T/DVB-H
              • Gap filler in single-frequency networks
            • Always on air
               
              • Convenient supply with different rated voltages
              • Self-monitoring power output stages
              • Standby systems for high availability
              • Maximum synchronization in single-frequency networks
            • Special features for operation
               
              • Precorrection for digital standards with set&go function
              • High adjacent-channel selectivity
              • DVB-T/DVB-H receiver for signal monitoring
            • Custom tailoring
               
              • Desktop unit or rack installation
              • Integratable options
              • Other accessories

          Brief Description

          R&S®XLx8000 UHF/VHF transposers offer compact, flexible solutions to reliably fill coverage gaps in transmitter networks.

          The R&S®XLx8000 family includes UHF and VHF transposers for digital and analog TV as well as for digital sound broadcasting. The compact devices can be used as transposers or retransmitters. Due to the short processing time, R&S®XLx8000 transposers can also be integrated into digital single-frequency networks (SFNs). Feedback is eliminated by high-quality, two-level echo cancellation. Intelligent operating functions reduce the transposers' setting times. For example, the automatic set&go function does away with a time-consuming manual precorrection of the output stages for all digital standards. The compact but flexible all-in-one-box concept allows various options to be integrated, which simplifies logistics and handling when sites are difficult to access.

          Specifications

          General data
            Transmitters with 2 HU Transmitters with 3 HU Transmitters with 4 HU
          Frequency range UHF (band IV/V) 470 MHz to 862 MHz 470 MHz to 862 MHz -
          Frequency range VHF (band III) - 174 MHz to 240 MHz 174 MHz to 240 MHz
          Available standards
          Analog TV B/G, D/K, I, L, M, N -
          Digital TV DVB-T, DVB-T2, DVB-H, ISDB-T, ISDB-TB, DTMB, CMMB, ATSC, ATSC Mobile DTV -
          Digital audio broadcasting - DAB, DAB+, T-DMB DAB, DAB+, T-DMB
          Supported network types MFN, SFN (only for digital TV and digital audio broadcasting)
          Supply voltage 100 V to 240 V, ±10 % 230 V AC, -10 % to +15 %
          Supported AC frequencies 50 Hz, 60 Hz
          Option -48 V DC -
          Synchronization
          Reference frequency 10 MHz, 0.1 V to 5 V (Vpp) or TTL, BNC
          Reference pulse 1 pps (1 Hz, TTL, BNC)
          Operation
          Local control display, keypad and status LEDs, web interface (via Ethernet port)
          Remote-control interfaces web interface (via Ethernet port) and SNMP (option), flaoting contacts (option)
          Input interfaces
          Sensitivity, digital TV -70 dBm to 0 dBm
          Sensitivity, analog TV -53 dBm to 0 dBm
          Sensitivity, DAB(+), T-DMB -80 dBm to -10 dBm
          Internal processing time (depending on filter)
          for DTV 6 μs to 13 μs
          for DAB/T-DMB 20 μs to 28 μs
          Echo cancellation
          Permitted echo at input
             Without echo cancellation <–10 dB relative to input signal
             With echo cancellation ≤+5 dB relative to input signal
             With enhanced echo cancellation ≤+15 dB relative to input signal
          Echo cancellation between 
          input and output
          35 dB
          SAW filter (option)
          Filter bandwidths 1.5 MHz, 5 MHz, 6 MHz, 7 MHz, 8 MHz
          Environmental conditions
          Max.installation height 2000 m above sea level (>2000 m on request)
          Operating temperature range +1 °C to + 45 °C
          Relative humidity (max.) 95 %, non-condensing
          Immunity

          class 2 (B) immunity to fast transients and burst in line with IEC61000-4-4: < 2 kV (power supply) and < 1 kV (signal inputs);
          class 3 (C) immunity to surges in line with IEC61000-4-5:

          • symmetrical < 1 kV (e.g. L1-L2)
          • unsymmetrical < 2 kV (e.g. L1-N)

           

          If the transmitter is operated in another class (> 2 or 3), protective measures must be taken. Rohde & Schwarz offers options for overvoltage and lightning protection.

          Dimensions
          (W x H x D)
          483 mm (19’’) x 88 mm x 467 mm (19.02 in x 3.46 in x 18.39 in) 483 mm (19’’) x 132 mm x 474 mm (19.02 in x 5.2 in x 18.66 in) 483 mm (19’’) x 176 mm x 590 mm (19.02 in x 6.93 in x 23.23 in)

          Remark: To comply with the applicable standards and limit values for the suppression of out-of-band emissions (and in the case of digital standards, also for maintaining the required shoulder distance), the transposer may only be operated with suitable filters at the RF output.

          罗德史瓦兹(Rohde & Schwarz,R&S)将于九月初举行的2007年阿姆斯特丹国际广播会议(International Broadcasting Convention,IBC)上,展示一系列的电视广播设备及测量仪表。除了发表新一代的高功率发射机Nx8600系列外,R&S为补强信号涵盖范围所新推出的R&S SLx8000低功率发射机、R&S XLx8000转频机、同频广播增力机(Gap Fillers),与全新简洁型的广播测试仪R&S SFE,也将于同时展出。

          R&S新发表的液冷式高功率发射机Nx8600系列,可支援类比与数字电视标准(、DVB-T/H),整合于单一机柜之全新机型,其数字信号输出功率最大至6kW及类比信号输出功率最大至16kW。Nx8600系列可协助降低营运成本,其外型设计可同时节省空间与成本,此发射机最佳化冷却系统,可降低25%的电力消耗并提升效率比,其他的功能包括待机测试设定、远端介面、自动数字等化调整(ADE)等功能。

          新一代的发射机系列包含R&S SLx8000小型低功率发射机及XLx8000转频机/同频广播增力机,这些发射机乃是针对网路最佳化时需要超低功率发射机的解决方案。由于发射机研发过程会使用相当多的零组件,高程度的整合是必要的。

          其中SLx8000发射机支援DAB/T-DMBDVB-T/-H、ATSC标准以及全部模拟电视标准,而XLx8000转频器亦可以支援Media FLO and DTMB标准。工作频段为UHF与VHF而最大发射功率分别为100W 、160W ATSC、250W ATV、300W DAB,这款发射机可直接安装于标准19"机架上,并可用远端控制的方式从类比模式转换为数字标准,使整个区域在一个特定日期同时转换成为数字模式。

          另外,整合的GPS接收模组、内建DVB-T接收器可应用于中继发射或监控、简易网路管理通讯协定(Simple Network. Management Protocol,SNMP)介面、远端控制并列埠介面等附加功能均可透过选用配件达成。上述发射机系列亦可进行远端控制,支援N+1 (包含1+1)待机设定,有益于数字网路弹性建置。

           而R&S SFE广播测试仪,是一台支援多重标准的信号产生器,适用于所有数字及类比电视标准以及各种语音广播标准。R&S SFE整合射频调变模组、即时编码器及基频信号源处理器,可产生频率范围自100kHz~2.5GHz的即时广播信号,可利用软硬体扩充的方式来新增功能,例如支援白高斯杂讯()产生及()测量或支援新的广播标准。

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