R&S N 8000 Series User Manual Download

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Broadcasting Division

2098.

0188

.72 -02

- 1.1 -

System Manual

Volume 1

R&S

TV Transmitter

s ATSC

Transmitter Series Nx8000

Only skilled personnel may perform the operations of the described instrument that
are necessary for installing and putting it into operation as well as maintaining, trou-
bleshooting and servicing it.

Printed in Germany

Summary of Contents for N 8000 Series

Page 1: ...830x DTV Transmitters ATSC Transmitter Series Nx8000 Only skilled personnel may perform the operations of the described instrument that are necessary for installing and putting it into operation as we...

Page 2: ...ns Infringements constitute an offence and are subject to claim for damages UrhG UWG BGB All rights reserved for patenting or utility model registration The R S logo Rohde Schwarz and R S are register...

Page 3: ...ality management system is certified according to standards such as ISO9001 and ISO14001 Environmental commitment Energy efficient products J J Continuous improvement in J J environmental sustainabili...

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Page 5: ...H Graf Zeppelin Stra e 18 D 51147 K ln GEDIS GmbH Sophienblatt 100 D 24114 Kiel HAMEG Instruments GmbH Industriestra e 6 D 63533 Mainhausen Locations Worldwide Please refer to our homepage www rohde s...

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Page 7: ...d an e mail to the Customer Support Center stating your instrument and your wish We will take care that you will get the right information USA Canada Monday to Friday except US public holidays 8 00 AM...

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Page 9: ...ctive when used for its intended purpose Gesundheit und Sicherheit gem 3 1 1 Artikel 3 1 a Health and safety requirements pursuant to 3 1 1 Article 3 1 a Schutzanforderungen in Bezug auf die elektroma...

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Page 11: ...ctive when used for its intended purpose Gesundheit und Sicherheit gem 3 1 1 Artikel 3 1 a Health and safety requirements pursuant to 3 1 1 Article 3 1 a Schutzanforderungen in Bezug auf die elektroma...

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Page 13: ...ctive when used for its intended purpose Gesundheit und Sicherheit gem 3 1 1 Artikel 3 1 a Health and safety requirements pursuant to 3 1 1 Article 3 1 a Schutzanforderungen in Bezug auf die elektroma...

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Page 15: ...ective when used for its intended purpose Gesundheit und Sicherheit gem 3 1 1 Artikel 3 1 a Health and safety requirements pursuant to 3 1 1 Article 3 1 a Schutzanforderungen in Bezug auf die elektrom...

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Page 17: ...zu notifizieren Informationen hierzu im Internet unter folgender Adresse http europa eu int comm enterprise rtte spectr htm For operation in the European Economic Area EEA and civil use Note pursuant...

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Page 19: ...2098 0188 72 1 3 E 1 NV830XE V CONTENTS SAFETY INSTRUCTIONS 1 DESIGN AND CHARACTERISTICS 2 INSTALLATION 3 COMMISSIONING 4 OPERATING 5 MAINTENANCE 6 TROUBLESHOOTING 7 SERVICE 8 INTERFACE DESCRIPTION 9...

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Page 21: ...Broadcasting Division 2095 7346 32 1 0 E 1 CHAPTER 1 SAFETY INSTRUCTIONS Printed in Germany...

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Page 23: ...may only be disposed of at a Rohde Schwarz service center or at a suitable depot Normas de Seguridad para Bater as Seg n BattV Este equipo lleva una bater a que contiene sustancias per judiciales que...

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Page 25: ...zards due to AC Supply Voltage 4 4 1 1 AC Power Supply 4 4 1 2 Replacing Fuses 5 4 1 3 Emergency Off Equipment 5 4 1 4 Opening the Transmitter 5 4 2 Hazards due to High Energy Circuits 6 4 3 RF Hazard...

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Page 27: ...shoot and service them The Annex includes interface descriptions plus technical documents For convenience all manuals are structured identically Sections that are not relevant to the manual at hand ar...

Page 28: ...of falling off ladders Risk of injury when lifting heavy objects Use your personal protective equipment for installation and repair work i e wear pro tective clothing such as helmets safety gloves an...

Page 29: ...e EN 60215 standard Safety requirements for radio transmitting equipment defines the minimum requirements for skilled electrical personnel Complying with all statutory provisions is a precondition for...

Page 30: ...the product The product is used for its designated purpose if it is used in accordance with its product documentation and within its performance limits see data sheet documentation the following safe...

Page 31: ...e positions specified by the manufacturer without the product s ventilation being obstructed If the manufacturer s specifications are not observed this can result in electric shock fire and or serious...

Page 32: ...t it is in proper operating condition By taking appropriate safety measures and carefully laying the power cable you can ensure that the cable will not be damaged and that no one can be hurt by for ex...

Page 33: ...damage may occur It is the responsibility of the employer operator to select suitable personnel for operating the products 2 Before you move or transport the product read and observe the section title...

Page 34: ...sunlight must be avoided Keep cells and batteries clean and dry Clean soiled connectors using a dry clean cloth 3 Cells or batteries must not be short circuited Cells or batteries must not be stored i...

Page 35: ...l regulations must be observed Also observe the relevant safety instructions in the product documentation The improper disposal of hazardous substances or fuels can cause health problems and lead to e...

Page 36: ...imprescindible leer detalladamente y comprender por completo las siguientes informaciones de seguridad antes de usar el producto y respetarlas durante el uso del producto Deber n tenerse en cuenta to...

Page 37: ...el fabricante respecto a los estados operativos y posiciones de funcionamiento sin que se obstruya la ventilaci n Si no se siguen las indicaciones del fabricante pueden producirse choques el ctricos...

Page 38: ...red el ctrica Si los productos sin interruptor est n integrados en bastidores o instalaciones se deber colocar el interruptor en el nivel de la instalaci n 5 No utilice nunca el producto si est da ado...

Page 39: ...ya se hayan producido condensaciones sobre el producto o en el interior de ste como p ej al desplazarlo de un lugar fr o a otro caliente La entrada de agua aumenta el riesgo de choque el ctrico 18 Ant...

Page 40: ...warz Si se reponen partes con importancia para los aspectos de seguridad p ej el enchufe los transformadores o los fusibles solamente podr n ser sustituidos por partes originales Despu s de cada cambi...

Page 41: ...s personales o da os en el producto siga las instrucciones de seguridad del fabricante del medio de transporte o elevaci n utilizado 3 Si se utiliza el producto dentro de un veh culo recae de manera e...

Page 42: ...AC power supply must comply with the following conditions The transmitter can be disconnected at any time The transmitter can be prevented from being switched back on The transmitter is terminated wi...

Page 43: ...upply circuit AC current supply for ac cessory equipment main control unit antenna switch etc or AC current supply for a disabled socket The transmitter operator is responsible for making sure that al...

Page 44: ...fier operating voltage These circuits conduct dangerously large amounts of energy We handle these circuits in the same manner as circuits with volt ages that bear the risk of electric shock They are u...

Page 45: ...e Transmitter Opening RF lines during operation may cause electric arcs This can cause burns and eye injuries Operate the transmitter system only if an antenna or dummy antenna is connected Never undo...

Page 46: ...ng When setting up the transmitter the operator must ensure that no inflammable materials are located below or above the cable entry nor attached to it Make sure that openings to adjacent spaces are c...

Page 47: ...1 9 E 4 5 Safety Data Sheets for Hazardous Materials This section contains the following safety data sheets in accordance with guideline 91 155 EEC EC safety data sheet for heat conductive paste EC s...

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Page 49: ...Broadcasting Division 2095 7346 32 2 0 E 1 CHAPTER 2 DESIGN AND CHARACTERISTICS Printed in Germany...

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Page 51: ...NetCCU800 11 1 2 2 Rack Controller 11 1 3 Connection Panel 13 1 4 Exciter Unit 14 1 4 1 Exciter 15 1 4 2 Exciter Switch 15 1 5 Output Stage Unit 15 1 5 1 Splitter 17 1 5 2 Amplifier 18 1 5 3 Combiner...

Page 52: ...gn and Characteristics 2098 0188 72 2 02 E 1 2 Specifications 31 2 1 Transmitter System General 31 2 2 Transmitter System Specific 32 2 2 1 R S NV8301 32 2 2 2 R S NV8302 33 2 2 3 R S NV8303 33 2 2 4...

Page 53: ...o 1 8 kW is available Both the power class of the transmitter and its type designation depend on the number of built in amplifiers This chapter describes the transmitter s design and the functions of...

Page 54: ...PPS Coder I Q Linear and nonlinear Precorrection Upconverter Dig IQ Dig IF 120MHz Synthesizer Down converter PLL Mainboard LO Mon Ext REF 10MHz Mon RF N RF DTV RF Mon TV Exciter SX800 A 3 x TS 120MHz...

Page 55: ...Chapter 2 Design and Characteristics 2098 0188 72 2 3 E 1 Fig 2 Modules of DTV transmitter here R S NV8304...

Page 56: ...Auxiliary power supply unit Optional socket Grounding bolt Transmitter control unit components R S NetCCU800 Rack controller Connection panel Exciter unit Exciters 1 to 2 Exciter switch with exciter s...

Page 57: ...1 Main switch power supply terminal 2 Motor protection switches 3 Automatic line fuses 4 Power distribution board 5 Auxiliary power supply 6 Optional socket 7 Ground bolt The power distribution is de...

Page 58: ...main switch can be equipped with a padlock to prevent unauthorized persons from switching it off and on Fig 5 Main switch with fuse 1 1 2 Motor Protection Switches Fig 6 Motor protection switches her...

Page 59: ...Line Fuses Fig 7 Automatic line fuses The automatic line fuses are used to protect the power lines e g in the event of a short circuit and to disconnect the following units from the AC supply R S Net...

Page 60: ...terfaces to which you can connect external equipment Note The appropriate dummy plugs are part of the transmitter and are located at the assigned positions The following equipment is or can be connect...

Page 61: ...to the additional control components in the rack The required redundancy of this auxiliary voltage is gener ated via the exciters which also output a 12 V current The following modules are powered by...

Page 62: ...onal socket is not connected with the transmitter network and must be supplied by means of a separate power lead 1 1 7 Grounding Bolt Fig 11 Grounding bolt The grounding bolt connects the rack with th...

Page 63: ...itor and control the transmitter to ensure that it functions properly 1 2 1 R S NetCCU800 Fig 13 R S NetCCU800 The R S NetCCU800 transmitter control unit handles internal and external communica tions...

Page 64: ...take and outlet air temperatures Transfers messages Accepts and outputs rack commands e g transmitter ON amplifier ON cooling sys tem ON Configures the test points mode dependent Switches off the rack...

Page 65: ...nd Characteristics 2098 0188 72 2 13 E 1 1 3 Connection Panel Fig 15 Connection panel The baseband signals as well as the monitoring and remote control connections are routed to the transmitter via th...

Page 66: ...l BITBUS interface ETHERNET Remote LAN connector or system LAN connector e g for N 1 ANTENNA 1 INPUT Antenna connection for receiver module input 1 in R S NetCCU800 DVB T only ANTENNA 2 INPUT Antenna...

Page 67: ...the exciter manual 1 4 2 Exciter Switch Fig 18 Exciter switch Note In transmitters with the exciter standby option two exciters the exciter switch is located behind the two exciters The exciter switch...

Page 68: ...ent of output stage unit here R S NV8304 1 Splitter 2 Amplifiers 3 Combiner 4 Absorber The output stage unit contains the following components Splitter Amplifier Combiner Absorber The diagram below sh...

Page 69: ...8 0188 72 2 17 E 1 Fig 20 Block diagram of output stage unit Example of the R S NV8304 1 5 1 Splitter Note This section is not relevant for transmitters having only one amplifier in the rack Fig 21 Co...

Page 70: ...ER between 450 W und 500 W The amplifiers amplify the exciter signals distributed by the splitter and forward them to the combiner The amplifiers in a transmitter rack are controlled via the rack cont...

Page 71: ...er 2 here R S NV8304 The RF power output from the amplifiers is merged with the correct phase via the combiner The combiner consists of a cascade of 90 hybrids housed in a single unit 1 5 4 Absorber N...

Page 72: ...stors dummy loads for the combiner are located on the absorber block When the combiner is being operated in unbalanced mode e g with one or more amplifiers disabled or removed the non combinable compo...

Page 73: ...r unit The directional coupler lightning protection system combined lightning arrester with test points is located at the output of the harmonics filter and contains the following compo nents Lightnin...

Page 74: ...00 transmitter control unit via the integrated rectifier circuit The DC voltages for forward and reflected power are displayed in the R S NetCCU800 and also used as an S measurement for VSWR monitorin...

Page 75: ...2 2 23 E 1 1 6 3 Directional Coupler Interface Fig 27 Directional coupler interface The free directional coupler interface can be used for connecting external power measuring instruments 1 7 Harmonics...

Page 76: ...armonics filter is located directly downstream of the combiner Note The harmonics filter is varnished to reduce the surface temperature Transmitters with one amplifier in rack In transmitters having o...

Page 77: ...ir intake duct 2 Fan 3 Starting capacitor 4 Differential pressure gage 5 Temperature sensor The cooling system consists of two built in fans on active standby and contains the following components Air...

Page 78: ...the intake duct is drawn in by the fans and forwarded to the distribution shaft The distribution shaft provides enough air to each amplifier to cool it The heated air is rout ed to an air collecting s...

Page 79: ...e absorber unit is situated at the bottom and feeds into the exhaust connection 1 9 2 Fans Fig 32 Fans A standard transmitter rack contains two fans which adequately cool the transmitter with air If o...

Page 80: ...Chapter 2 Design and Characteristics 2098 0188 72 2 28 E 1 1 9 3 Starting Capacitors Fig 33 Starting capacitor Each motor is equipped with an external starting capacitor...

Page 81: ...l Pressure Gages Fig 34 Differential pressure gages The differential pressure gages diaphragm switches measure the differential pressure of each fan between the fan flange output and the environment T...

Page 82: ...emperature sensors The temperature sensors measure the absolute intake and exhaust air temperatures in C for display on the R S NetCCU800 and monitoring in the rack controller Note If the exhaust temp...

Page 83: ...erature range 1 C to 45 C Max permissible humidity 95 non condensing Dimensions W x H x D 600 mm x 2000 mm x 800 mm RF connector 15 8 EIA VSWR s 1 3 Operating mode Coding and modulation in accordance...

Page 84: ...bandpass Recommended bandpass for suppressing spurious emissions example 6 MHz channel bandwidth f0 3 5 MHz 3 dB f0 4 0 MHz 8 dB f0 6 0 MHz 30 dB f0 9 0 MHz 65 dB Shoulder distance at 3 25 MHz 37 dB E...

Page 85: ...with Poutmax Heat dissipation ducted worst case 3 1 kW Heat dissipation to surrounding air approx 350 W Additional fuses Backup fuse type NH gG 3 x 20 A Connection cross section 2 5 mm2 AWG 12 Backup...

Page 86: ...4 R S NV8304 Number of amplifiers 4 Pout with MER 34 dB 1720 W Pout with MER 33 dB 1800 W Air flow rate At least 17 m3 min Power consumption worst case 10 0 kW with Poutmax Heat dissipation ducted wor...

Page 87: ...Broadcasting Division 2095 7346 32 3 0 E 1 CHAPTER 3 INSTALLATION Printed in Germany...

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Page 89: ...er Roof 6 3 2 Erecting Transmitter Rack 7 3 3 Aligning Transmitter Rack 7 3 4 Fastening the Transmitter Rack to the Floor 7 3 5 Removing Front Panels Rear Panel 7 3 6 Unpacking Components 8 4 Ventilat...

Page 90: ...Chapter 3 Installation 2098 0188 72 3 02 E 1 7 2 Connecting Dummy Antenna 21 8 Connection Panel 23...

Page 91: ...V exciter SX800 Transmitter type NV830xE NV830xV R S SV800 Quantity of R S SV800 1 2 2095 1502 XX 1 Auxiliary power supply unit 1081 0254 00 1 Rack Controller 2096 4505 02 2 Barometric capsule 2077 39...

Page 92: ...1 Parallel remote control inter face R S ZR800F1 3562 4210 02 1 External socket kit R S ZR800Z1 2099 3000 02 1 Internal socket kit VAR 14 4 socket low tem perature connector strip VAR 16 6 socket low...

Page 93: ...Aligning the transmitter rack Bolting the transmitter rack to the floor Removing the front panels rear panel Unpacking the components Ventilation system Connecting the intake exhaust air ducts Connec...

Page 94: ...smitter is to be operated has an adequate weight to floor area ratio The total weight of a transmitter rack can be as much as 385 kg when fully equipped with plug in units This results in a weight to...

Page 95: ...72 3 5 E 1 Fig 1 Transmitter floor dimensioning 1 Adjustable foot 50 2 AC supply input 3 Bottom intake flange 178 4 Bottom exhaust flange 178 5 Bottom RF output ATV 1 5 8 EIA 6 Bottom RF output DTV 1...

Page 96: ...parations for installing the station please observe the following drawing of the transmitter roof Fig 2 Transmitter roof dimensioning 1 Intake flange 178 2 Exhaust flange 178 3 Remote control interfac...

Page 97: ...eet align the rack such that it is vertical and horizontal along all axes 3 4 Fastening the Transmitter Rack to the Floor If required the transmitter rack can be screwed to the floor or to a floor fra...

Page 98: ...all the necessary units connectors and interfaces Note Pay attention to the ground connections when removing and fitting the front panels and the rear panel Fig 4 Ground connection on a front panel 3...

Page 99: ...the required air volume e g for R S NV8304 4 amplifiers 17 m2 min As a result a pipe system of max 12 m in length D 250 mm two 90 bends and an air filter with a drop in discharge pressure of 40 Pa can...

Page 100: ...0188 72 3 10 E 1 Fig 5 Transmitter roof dimensioning 1 Intake flange 178 2 Exhaust flange 178 3 Remote control interface 4 Remote control interface optional 5 Transmitter connection panel 6 TS distri...

Page 101: ...72 3 11 E 1 Fig 6 Transmitter floor dimensioning 1 Adjustable foot 50 2 AC supply input 3 Bottom intake flange 178 4 Bottom exhaust flange 178 5 Bottom RF output ATV 1 5 8 EIA 6 Bottom RF output DTV 1...

Page 102: ...m button into the cooling disturbance circuit of the transmitter Switched phase for external fan X33 1 L line protection 3A X33 2 N X33 3 PE Excess external cooling 44 1 44 2 Fig 7 Male connector for...

Page 103: ...ave to be closed 4 4 Checking Differential Pressure Gages For the differential pressure gages to be able to measure the pressure between the fans and the environment the covers must be removed Make su...

Page 104: ...he AC supply voltage is within the specified range and check all power cables for possible damage System type Power consumption a PAC worst case b a Power specifications without optional equipment b T...

Page 105: ...round connection on transmitter rack 5 2 Connecting AC Power Cable The external power supply is connected for each rack directly to its main switch The main switch completely isolates the rack from th...

Page 106: ...he rotary switch and the cover of the main switch Fig 11 Unscrew rotary switch and cover 2 Secure the supplied strain relief for the AC supply cable in place as shown AC power supply Main switch Q1 L1...

Page 107: ...crews 5 Using a phase sequence indicator determine the phase sequence of the rotating field should be clockwise If the phase sequence is correct continue to the next step If the phase sequence is not...

Page 108: ...on Connecting Dummy Antenna Suitably adapted dummy plugs are located at the points provided for the purpose 1 Take the required dummy plug from the power distribution board 2 Connect the cable of the...

Page 109: ...lifier from its packaging 2 Select the installation position provided for the amplifier in the transmitter rack 3 Place the amplifier on the guide rails and slide it carefully into the rack as far as...

Page 110: ...ission line or an RF connection is connected directly to a multiple combining filter 7 1 Connecting Antenna Connect the antenna as follows Using the 4 screws M8 35 mm secure the coaxial cable preassem...

Page 111: ...to operation 1 To connect the main protection loop use the inserted jumper plug and remove the jump er 2 Connect the monitoring cable in place of the jumper If you are using an RF patch panel that all...

Page 112: ...Chapter 3 Installation 2098 0188 72 3 22 E 1 Fig 17 Looping in an antenna patch panel...

Page 113: ...1 INPUT Antenna connection for receiver module input 1 in R S NetCCU800 DVB T only ANTENNA 2 INPUT Antenna connection for receiver module input 2 in R S NetCCU800 DVB T only TS1 TS2 Transport stream i...

Page 114: ...Chapter 3 Installation 2098 0188 72 3 24 E 1...

Page 115: ...Broadcasting Division 2095 7346 32 4 0 E 1 CHAPTER 4 COMMISSIONING Printed in Germany...

Page 116: ......

Page 117: ...net Interface NETLINK 7 2 4 Setting Transmitter Type 9 2 5 Entering Exciter Settings 11 2 5 1 Setting TV Standard 11 2 5 2 Configuring Input Interfaces 12 2 5 2 1 Specifying Data Format for Data Strea...

Page 118: ...l 31 4 1 2 Linear Basic Precorrection 31 4 1 3 Nonlinear Frequency Responses 32 4 1 4 Dynamic Precorrection ATV Split Only 32 4 1 5 Audio Phase Precorrection ATV Combined Only 32 4 2 General Informati...

Page 119: ...essages Set up the following jumpers connections on the power distribution board connectors the name of the connector concerned is printed on the board RF carrier loop in operation X41 1 2 RF Carrier...

Page 120: ...et 2 Connect an antenna to the RF output Switching on transmitter Switch on the transmitter as follows 1 Switch on the main switch Q1 2 Switch on the exciter F1 or F2 The exciter boots up 3 Switch on...

Page 121: ...ystem and Operating Parameters In order to bring the transmitter into operation you must check and set the following system and operating parameters 2 3 R S NetCCU800 2 3 1 Switching On R S NetCCU800...

Page 122: ...ht of Select user from list 2 Under Select user from list select the user ID Configuration After confirming with OK you are logged on again with configuration rights Note No password is required to ch...

Page 123: ...ned via NTP and a time set manually under Local Time is overwritten Function Explanation Display Timeout Time in minutes after which the display switches off standby LED Local Color of the Local LED o...

Page 124: ...ate the transmitter remotely using a connected PC Setting item Explanation Date Used to set the current date Local Time Used to set the local time The local time is the time of day or zone time applic...

Page 125: ...CCU800 see above a value below 250 must be entered for the last segment Subnet mask PC Same settings as under Network Mask see above 2 3 5 2 Rear Ethernet Interface NETLINK Configure the NETLINK inter...

Page 126: ...client On The network settings for IP address subnet mask and gateway are retrieved automatically by a DHCP server Off The network settings for IP address subnet mask and gateway must be entered manua...

Page 127: ...s Function Explanation Tx Mode Used to select the transmitter standard NoExciter R S NetCCU800 is operated as a standalone instrument e g in combination with the DVB T receiver module option Multi Bot...

Page 128: ...PA Standby system see below Power Switch Used to set the hardware configuration for antenna switchover The fol lowing options are available Manual for manual antenna switchover Automatic for electroni...

Page 129: ...dard Selection of the digital TV standard DVB T DVB H or ATSC To switch over from DVB T or DVB H to ATSC you need to reboot a the exciter At the same time signal processing is switched over and the as...

Page 130: ...s on inputs TS 1 IN or TS 2 IN The options are as follows AUTO The data format is recognized automatically ASI Manual setting for an ASI transport stream SMPTE Manual setting for an SMPTE transport st...

Page 131: ...ng parameter settings Priority Selects the priority mode EQUAL The preselected operating input and standby input have the same priority Once a switchover has taken place the system does not normally s...

Page 132: ...e output signal is not suppressed only effective with MFN Mute The output signal is suppressed if the data rate is incorrect rec ommended for SFN Type of Loss of Input Selection Warning If the input s...

Page 133: ...switched on again before precorrection is carried out 2 5 4 Setting Transmitter Frequency 1 Select Exciter A ATSC RF Synthesizer The RF Synthesizer window opens 2 Make the required settings for trans...

Page 134: ...ly performed Adjusted is displayed Note A guide to manual adjustment of the I Q modulator can be found in the exciter manual Reference Selecting the reference source for stabilization of the frequency...

Page 135: ...ation Activates On or deactivates Off the output level control During trans mission operation control must be enabled The current status of the related level adjuster is displayed as a percent age und...

Page 136: ...e of the amplitude frequency response in the spectrum for equalizing subsequent components output stage filter Display Description AGC Regulation Displays the level of the output level control Setting...

Page 137: ...pressed if the 1 pps sig nal fails for longer than the period specified at Fail Delay Time This is the recommended setting for operation in SFN mode Mute on Ref Fail For setting the behavior in SFN an...

Page 138: ...alue 65 C Outlet Temp Warning Warning threshold for overtemperature A warning is generated if this threshold value is exceeded Sum Probe at Rack Used to select the transmitter rack rack controller to...

Page 139: ...t messages are output default setting no Output of RF warnings and fault messages at the test points of the rack is suppressed General purpose input Assignment of a free line on the rack controller fo...

Page 140: ...rated 2 8 1 Calibrating Forward and Reflected Power Displays Forward power display Note To allow calibration the transmitter must be operated at the required transmitter power 1 Select NetCCU RF Probe...

Page 141: ...n the table below Function Explanation Measured Values Measurement display Power Current forward power Voltage Currently measured DC voltage of the test point Configuration Definition and setting of a...

Page 142: ...eout RF Fail Con trol Used to select the time that the lower threshold for the forward power specified as the RF Fail Limit must be violated for before a fault mes sage is output For example if a valu...

Page 143: ...he test point Configuration Setting of a warning threshold for the reflected power Nominal Value Forward power 50 corresponds to the maximum reflected power Warning Limit Used to select a dB value for...

Page 144: ...s that on site com pliance testing is only necessary at the customer s request 3 1 Final Steps 3 1 1 Checking R S NETCCU800 Status Display 1 Select NetCCU Status Device Status The Device Status window...

Page 145: ...y to operate no warnings or faults will be signaled 3 1 2 Checking Exciter Status Display 1 Select Exciter A B ATSC Status The Status window opens 2 Check the status of the warning and error indicator...

Page 146: ...ors If a transmitter is ready to operate no warnings or faults will be signaled 3 Select Outputstage Status Rack Status Rack x Rack Controller The Rack Status Rack x Rack Controller window opens 4 Sel...

Page 147: ...ular rack are displayed in the menu path for the output stage with consecutive numbering Amplifier 1 to max Amplifier 10 Since the numbering is derived from the chronological sequence in which the amp...

Page 148: ...procedure is completed when each order number in the Device column correctly corresponds to the position of the associated amplifier in the rack 3 3 Clearing Event Memory There are four event memories...

Page 149: ...ignal am plitude and maximum amplitude respectively The Y axis represent the effect and is scaled to 50 for amplitude precorrection and 45 for phase precorrection 50 means that at 100 amplitude the le...

Page 150: ...the modulation This error can be compensated for by dynamically modifying the characteristic as a function of the aver age signal value 4 1 5 Audio Phase Precorrection ATV Combined Only In ATV combine...

Page 151: ...wing method can be used to determine the actual values 1 Use two interpolation points to determine the ends of the effective dynamic range in or der to define the possible setting range of the precorr...

Page 152: ...are difficult to detect owing to the band limiting of the filter When measuring signals using the spectrum analyzer it is important to ensure that the precorrection target e g 38 dB shoulder dis tanc...

Page 153: ...il the shoulder distance on the analyzer visibly improves 3 Keep improving the shoulder distance on the analyzer until the optimum result is ob tained 4 Set another point at about 35 5 Shift the magni...

Page 154: ...n point brings about an improvement deal similarly with the other in terpolation points 1 Set the interpolation points more or less at the positions of the phase values 2 Set all magnitudes to zero 3...

Page 155: ...ound The FreqCorrection control panel can be used to influence the characteristic by means of an amplitude and or phase frequency response the effect of which is dependent on the lev el A set frequenc...

Page 156: ...also activate Correction Point 1 Amplitude Slope Point 1 and Phase Slope Point 1 Set Position Point 1 to 5 Fig 5 The FreqCorrection user interface with an onset point at 5 4 Now minimize the shoulder...

Page 157: ...e required data is not or is no longer observed to be in an existing or factory set precor rection characteristic the precorrection does not necessarily have to be readjusted An adjustment to the true...

Page 158: ...Chapter 4 Commissioning 2098 0188 72 4 40 E 1...

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R&S N 8000 Series, System Manual

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