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TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration PRESENTATION OF 20 kW Band II FM TRANSMITTER Air Cooled Type Compact Design – Very High Efficiency TB02-202F 20 kW Band II FM TRANSMITTER TB02-203F 20 kW FM BAND II TRANSMITTER The TB02TB02-203F belongs to the High Power VHF product family of FM Radio Transmitters fully solid state technology air cooled. The 20 kW family operating in the Band II or Band I (OIRT) for FM stereo sound broadcasting. The equipment is fully compliant with the personnel safety requirements as specified in EC 215. The transmitters have been designed to offer to the customer high performances, high reliability and great simplicity in their operation and maintenance procedures. Key Features Transmitter Model Band Frequency MHz Output Power Standard Comply TB01-203F I (OIRT) 65.80 to 74.00 20kW OIRT TB02-203F II 87.50 to 108.00 20kW CCIR and FCC Dual Drive Configuration BROADBAND frequency synthesizer, without any other tuning or alignment. MONOPHONIC & STEREOPHONIC emission according to the CCIR rec. 450450-2 standard. RDS & SCA subcarriers input capability HiHi-FiFi-quality modulated signal, with low residual noise and distortion. Digital Exciter with DDS process upup-gradable AESAES-EBU digital interface available as option RF Signal free from spurious and harmonic signals MOSFET to obtain wide band , reliability , and high efficiency. Redundant 5 x 4kW RF power amplifier and power supply Hot pluggable any RF power amplifier Dual Drive ; 1+1 ; N+1 Redundancy configuration capability High Tolerance mains voltage (± (± 20 %) is accepted by the transmitter Mains Protection System by means of Surge Arrester System (option) Remote Operation compliant to IEC 864864-1 rule (all option are available) Control System including fault finding PROTECTION AND CONTROL SYSTEMS Block against emission on spurious frequencies Reflected power Modulation limiter Air cooling system fully integrated and outdoor conveyable Very low acoustic noise -64 dBA High efficiency ≥ 60 % with cooling system included Compact design only one 600 mm rack 42 unit height is used TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration Modularity The Transmitters employ a modular system for the main sub-assembling: this provides the high standardisation of the spare part, so that the same units can be installed, as spare part, for several transmitters throughout the Medium power range from 5 kW to 40 kW. 25 W High Performance Stereo FM Exciter High level of performance These transmitters were specifically designed to comply with the latest international standards and the requirements of advanced broadcasters, meeting tighter specifications than usually required, at an affordable cost. Great care went into producing a Hi-Fi-quality modulated signal, with low residual noise and distortion. The RF signal is also free from spurious and harmonic components to a higher degree than required by CCIR and most national standards. TB02-202F 20 kW Band II FM TRANSMITTER WideWide-Band Amplification The RF amplifier is made up by five RF modules (2A(2A-402S) installed in the rack , the modules are dedicated for the Sound FM carrier amplification. The nominal output power for each module is 4000 W ; the amplifiers employ solid state MOSFET technology in order to obtain wide band , reliability and high efficiency . Each RF module has an own redundant switchswitch-mode power supply unit selfselfprotected against overover-current and overover-voltage , as well the overovertemperature , overdrive and VSWR for RF parameters. The power supply units are installed below the RF modules in the separate hot pluggable draws. The redundant system provides to feed 50% (worst case) of the each RF module final stage. RF IN Dual Drive Configuration RF OUT A /ϕ DRIVER STAGE OUTPUT STAGE 2A 402S FM Amplifier Simplified block diagram TB02-202F 20 kW Band II FM TRANSMITTER Key Features Broadband, without any other tuning or alignment. High Output Power up to 4kW continuous MOSFET technology Redundant Design due to twelve paralleled devices to the final stage Power Supply Replacement facility allowed by separate plug-in Air Cooling System with high efficiency , tanks to new design of the heat-sink layout Amplitude and Phase Adjustment facility accessible from panel Diagnostic completely available in locally and remote Very Low MTTR (Mean Time Trough Replacement) only 10 minutes in the worst case. Easy Maintenance all internal subunit can be replaced without soldering and complicated procedure for alignment. Compact Design allows to minimize the dimensions and weight Dual Drive Configuration 2A 402S FM 4 kW Amplifier Internal layout TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration CLEAN DESIGN Rear rack view with open door Each RF module has an own redundant switch-mode power supply unit self-protected against overcurrent and over-voltage , as well the over-temperature. The power supply units are installed below the RF modules in the separate hot pluggable draws. The redundant system provides to feed 50% (worst case) of the each RF module final stage. TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration Mains Protection System The Mains Distribution Unit is installed in the lower side rack , it provide to feed the subunits with unregulated AC prime power supply , the protection against the accidental line sparks is performed by means of surge arrester system. The high tolerance mains voltage (± 20 %) is accepted by the transmitter , so that in the most situations, the Automatic Voltage Regulator is not necessary. TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration Easy Operation and Maintenance The Control Unit provides the full management of the transmitter without the operator presence, the system involves a central controller and several peripheral units installed in each RF module and rack. The control system includes a fault finding for detecting equipment malfunctions and locating the faulty subassembly which need to be replaced; the basic controls as Start - Stop Standby - Reset and power readout are permanently available. The interlock circuit is independent of the of the control system and remains always operational during the presence or not of the control unit. TB02-202F 20 kW Band II FM TRANSMITTER Dual Drive Configuration Equipment Redundancy The equipment design allows the soft degradation (RF power loss) for several transistors faulty; the table below shows it. 0 Output power reduction -0,5 -1 dB -1,5 -2 -2,5 -3 -3,5 -4 0 5 10 15 20 Number of the transistors failed (total final stage transistors = 60 ) RELIABILITY ASPECTS Soft degradation about devices