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Download 2.5kW VHF/FM Transmitter U3-2.5
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VHF/FM Transmitter U3-2.5 2.5kW VHF/FM Transmitter U3-2.5 The 2.5kW VHF/FM Transmitter U3-2.5 is designed for frequency modulated broadcast, mono or stereo, in the frequency range of 87.5 to 108 MHz. The integrated digital exciter offers fully digital design and digital inputs via AES/EBU. The high-power VHF/FM transmitter familiy includes the power classes of 2.5kW, 5kW, 10kW and 20kW. Image: 2.5kW VHF/FM transmitter U3-2.5 Features: Up to 20kW transmitter output power per 19” standard rack Fully digital exciter with digital input via AES/EBU or optional analog inputs Direct Digital Synthesis (DDS) Integrated stereo encoder with deviation limiter High internal redundancy; even in 2.5kW version; dual redundant 24V power supply Amplifier modules are hot-pluggable, only 25mW input power per module Each amplifier module includes its own primary power supply unit Low output transistor junction temperatures for a high MTBF Easy handling for comfortable replacement, each amplifier module weights about 15kg Multi-Transmitter-Option offers n+1 solutions in one 19” rack Integrated air-cooling up to 10kW per 19” rack Support of future proof function for SFN (Single Frequency Network) and Audio Network 1/4 Not binding for delivery Load Resistor Temp. Splitter USB RF-OUT VHF/FM Transmitter U3-2.5 Combiner Power Amplifiers (PA) Control Unit (CU) Ethernet RS232 Parallel Controller Display Blockdiagramm of the VHF/FM Transmitter U3 with Dual Exciter in Passive Standby Amplifier Module 1 Bitbus SNMP HTTP 24V= Amplifier Module 2 Exciter MPX Digital Stereoencoder Stereo AES EBU RDS Deviation limiter Amplifier Module 3 Digital Synthesizer 25 mW Antenna RFswitch GPSSynchronisation RF-forward 20 kW SCA 24V= Passive Exciter Standby Digital Stereoencoder Deviation limiter RF- reflected Directional Coupler Amplifier Module 22 Digital Synthesizer 25 mW GPSSynchronisation Amplifier Module 23 24V= ~ = ~ = Amplifier Module 24 24V= Splitter 1:3 Amplifier Module Combiner 3:1 Cental Redundant Power Supply 24V= CANBUS 400V~ = Protective Circuit Block Diagramm of the 900W Amplifier Module Amplifier Module USB CAN Eth(Audio) RS 232 (RDS-, SCAData) Signal Processor Control MPXd+ (32bit) Synthesizer L in R in L out R out SCA/MPX/DARC 100 24 bit A/D + D/A Option 16 bit A/D Option AES 24 bit DSP Stereoencoding Filter PreAmplifier Deviationlimiter Summing Unit CAN FPGA Interface A/D + D/A Option 16 bit D/A Option AES/EBU Interface RDS Deviation Scaling TCXO 10 MHz Digital Up-Sampling Filter SCA/MPX 80 MPX 80 Pilot External 10 MHz from GPS DDS (32 bit) D/A (16 bit) MPX 100 Mixer Ultralow Phasenoise VCXO AES Output Monitoring ASRC RF (25mW) MPXd+ (32bit) Block Diagramm of the Digital Exciter 2/4 Not binding for delivery VHF/FM Transmitter U3-2.5 Technical Data Exciter E3420 Typ Exciter key features • Digital Signal Processing Blackfin® DSP / Xilinx FPGA • PLL controlled VCXO for minimum phase noise (GPS lockable) • Digital MPX link (MPXd+) between digital stereo encoder and digital synthesizer • The base- version offers pure digital connectivity via AES/EBU: this may be upgraded using Feature Expansion Packs (FEP’s) for additional analogue inputs (SCA,MPX, RDS) • Preemphasis switchable off, 25, 50, or 75 us Generic specification 24 bit Audio Converter (192kHz) 4 times oversampling 16 Bit converters for SCA input / MPX output Inputs AF Inputs - MPX (up to 100 kHz): -10 or +11.5 dBu - AES/EBU, -9 dBFS* -10 … +8 dB (all sample rates with SRC) - Analog: + 6 dBu* -10 … +8 dB balanced (*40kHz deviation) RDS Input 2 SCA Inputs -23…-9.5 dBu, Deviation 2…4 kHz -23…-9.5 dBu, Deviation 2…4 kHz (up to 100 kHz) Streaming Protocols (optional on request) DGC (Digital Gain Control) with variable threshold and configurable fade-in time. Final clipper, ITU BS 412 compliance Deviation Limiter Technical Data Transmitter T3401 Typ Transmitter Power Output power PRF Amplifiers Output power setting range Full power up to VSWR = 1.5 2.5 kW 3 * 900 W 500 W ... 2,5 kW, continuous Thereafter down regulation of output power Frequency Frequency range Frequency change Output frequency stability over 3 months period Setting accuracy Middle frequency shift during modulation Warm-up time 87.5 MHz ... 108 MHz, in 10 kHz steps < 1 sec < 300 Hz < 50 Hz 0 Hz None Spurious Emission Suppression of RF harmonics Noise power relative to carrier (2MHz offset) < - 87 dBc < - 150 dBc/Hz Reverse Intermodulation Products > 15 dB Input Impedance > 2000 Ω or 600 Ω 3/4 Not binding for delivery VHF/FM Transmitter U3-2.5 Linear Distortion Stereo cross-talk attenuation 40 Hz ... 15 kHz Amplitude deviation 40 Hz ... 65 kHz > 65 kHz ... 76 kHz 100 kHz Damping of the 15 kHz low-pass 40 Hz ... 15 kHz at 19 kHz < 0.1 dB > 54 dB Non-Linear Distortion Distortion factor 40 Hz ... 15 kHz, at 75 kHz deviation < 0.05 % = - 66 dB Selective S/N Ratio Mono Stereo > 80 dB > 78 dB Unweighted S/N Ratio (effective peak value) Mono Stereo AM unweighted S/N ratio, asynchronous AM unweighted S/N ratio, synchronous > 80 dB > 77 dB > 65 dB > 65 dB Weighted S/N Ratio (effective peak value) Mono Stereo AM weighted S/N ratio, asynchronous > 75 dB > 72 dB > 72 dB Power Supply Voltage range 340 V ... 440 V > 60 dB ± 0.05 dB ± 0.05 dB ± 0.05 dB 3/N/PE 400 V -15/+10% Mains frequency Typical efficiency cos φ 47 Hz ... 63 Hz > 62% > 0.9 < 2 sec Recovery time following mains interruption RF output connector Number of presets 7/16, 50 Ω 8 (program name, set power, AF- level, modulation type, deviation limiter, frequencies) Remote interfaces RS232, Ethernet, HTTP optional, BITBUS, SNMP or parallel Cooling Operational in the temperature range Humidity Dimensions W x H x D in mm Weight Air, 500m³/h, 350PA, - 10° C ... + 45° C to 95 %, without dew 600 x 2000 x 1000 400 kg The VHF/FM transmitter fulfils the national standards as well as the technical specifications of the ARD (5.1.0), ARD (5/ 3.1), ARD (5/3.2), the Deutschen Telekom (TS0162), (TS 0216), (TS0218), ETS 300 484, ETSI EN 302 018-2, ETSI EN 301 489-1, ETSI EN 301 489-11, ETSI EN 55011. Quality Management System DIN EN ISO 9001 EC-R&TTE APPROVAL CERTIFICATED Contact address: TRANSRADIO SenderSysteme Berlin AG Mertensstr. 63, 13587 Berlin, Germany Telephone: +49 30 339 78-0 Telefax: +49 30 339 78-599 Email: [email protected] Internet: http://www.transradio.de 4/4 Not binding for delivery