Linear Industries, Inc.
AT75K0-1 Owner’s Manual Linear AT75K0-1 5kW UHF 8VSB-ATSC EXCITER/TRANSMITTER Owner Manual Table of Contents User Notices and Warnings 3 Section 1 – AT75K0-1 Introduction 6 Section 2A – AT7001 Digital Exciter 17 Section 2B – AT7001 Field Installation (retro-fit) 21 Section 3A – RF Power Drawer - Module 4634 34 Section 3B – RF Power Drawer Operational Software - Model 4634 52 Annex A – AT75K0-1 Operational Software 80 Annex B – GUI7001 software 109 Annex C – Digital Exciter Connections 140
AT75K0-1 Owner’s Manual User Notices and WARNINGS USER NOTICES IT IS VERY IMPORTANT TO READ THIS MANUAL PRIOR TO OPERATION OF THIS TRANSMITTER! Notice 1 The transmitter main operating voltage setting is marked on the rear of the AT75K01 chassis. Notice 2 The transmitter operating frequency is set from the factory. Notice 3 For adjusting the RF output power setting a qualified technician should always employ the use of an RF Wattmeter and a calibrated dummy load.
AT75K0-1 Owner’s Manual WARNING! THE VOLTAGES AND CURRENTS IN THIS EQUIPMENT ARE DANGEROUS. PERSONNEL MUST, AT ALL TIMES, OBSERVE SAFETY WARNINGS, INSTRUCTIONS, AND ANY LOCAL REGULATIONS. THIS OWNER‟S MANUAL IS INTENDED AS A GENERAL GUIDE FOR TRAINED AND QUALIFIED PERSONNEL WHO ARE AWARE OF THE DANGERS THAT ARE INHERENT IN THE HANDLING AND OPERATION OF POTENTIALLY HAZARDOUS ELECTRICAL AND ELECTRONIC CIRCUITS.
AT75K0-1 Owner’s Manual Returns and Exchanges Equipment (Damaged or undamaged) should not be returned unless written approval and a Merchandise Return Authorization (MRA Number) is received from your Linear Sales representative or Linear Customer Service. Special shipping instruction will be provided which will assure proper handling. The circumstances and reasons for the return must be included in the request for return. Equipment that is special or “custom” ordered may be not returnable.
AT75K0-1 Owner’s Manual Section 1 – AT75K0-1 Introduction 1. Introduction The LINEAR AT75K0-1 is a 5,000W (5kW) UHF ATSC Digital TV transmitter. It is designed by Linear Industries using state-of-the-art technology in digital signal transmission. This transmitter uses an intelligent digital control system using microcontrollers; this system allows real-time supervision over the transmitters‟ operational functions.
AT75K0-1 Owner’s Manual Red LEDs on the front panel display alarm warnings. An alarm log displays current and past alarms. Low acoustic noise, forced air Ventilation system. Modular Design, using SMD devices to facilitate the operation and maintenance. High Quality compared with the cost, high cost benefits ratio. Fully designed by LINEAR 25" Cabinet Racks. 1.
AT75K0-1 Owner’s Manual The modulator generates 2 IF signals, termed: In-Phase (I) and Quad (Q). The modulated signal IF center frequency is 18,833916 MHz The entire modulation process adheres to the ATSC A/53E recommendation. The modulated IF signals (I) and (Q) are connected to the UHF Up-Converter module. This module generates the frequency translation from the IF frequency to the operational channel frequency.
AT75K0-1 Owner’s Manual By using the hyper-terminal interface in the local drawer control unit, it is possible to: Adjust the idle currents of the transistor‟s software. Numerically identify the drawer, the installed software and its current version. Measure the direct and reflected RF power at the RF output connector of the drawer. Read the electrical currents and temperatures associated with each RF transistor and modules.
AT75K0-1 Owner’s Manual Band 25480 25482 14 38 39 69 514,6mm 468,4mm POWER SUPPLIES The collection of power supplies that are a part of this transmitter are switching power supplies. These power supplies are divided in 3 different models: - Module 4580 – Main Drawer Power Supply - Module 4606 – Exciter power supply - Module 4401 – General Power Supply Main Drawer Power Supply The Main RF power amplifier drawer holds its own power supply.
AT75K0-1 Owner’s Manual Electrical Energy Structure Two electrical structures are suitable for this transmitter: Delta Tri-phase or Star 220VAC Star Tri-phase + Neutral 380VAC On both configurations above, the IRUSH circuit is used. This circuit reduces the peak of current generated by the switching power supplies at the time the green bottom power supply switch is turned ON. On the same system there is also a DC/DC converter, and a battery re-charger, for a installed in 12v/ 7Ah battery.
AT75K0-1 Owner’s Manual 1.5 AT75K0 – 5.000W UHF ATSC/8VSB Transmitter - Technical Specifications Electrical Main Consumption Power Factor Correction, FPC. Signal Input Transport Stream Input Input Data Rate External Reference Signal Input Connector Reference Input Connector RF Modulation Mode IF Channel Bandwidth Test Signal Frequency Range Frequency Step Symbol Rate Digital/Analog Converter Both Linear and Non-Linear PreCorrection Pilot frequency stability overall Initial tolerance Vs.
AT75K0-1 Owner’s Manual 1.5.1 Typical In band and adjacent channel filter Response © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 1.5.2 Low Pass Filter a) – Functional Description: This filter, module 4333 was designed to improve the spectral performance of the transmitter. It is a 3 1/8” rigid line non-adjustable filter. Two different lengths are used to provide cover from CH14 up to CH38, and above CH38. b) - Technical Specs: IN/OUT Impedance IN/OUT Return Loss Power Operational Frequency Insertion Loss IN/OUT RF Connector Harmonic Attenuation 50 Ohms >23dB 7.5kW 470 to 700MHz <0.
AT75K0-1 Owner’s Manual AT75K0-1 Block Diagram: PC ON / OFF FROM DIG. EXCITER RACK EIA 25” 36U * 4252 FILTER USB MICROCOMPUTER Low-Pass Filter for reflected power sample TOUCH SCREEN 12’’ MODULE 4647 DIG.EXCITER TSOUT RS485 OUT 2 RFOUT RFIN IN OUT 3 10MHz 10MHz REFIN REFOUT AT7001 220V RS485 1:14 DIVIDER MODULE 4496 POWER DRAWER 14 RFIN UHF ATSC POWER DRAWER P3 MODULE 4634 14:1 COMBINER MODULE 4497 RFOUT 220V RS485 +30V READING RFIN SOUNDING TO DIGITAL EXCITER DIG.
AT75K0-1 Owner’s Manual 1.7 Front View Photo © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Section 2A – AT7001 Digital Exciter 1. Introduction The objective of this section is to supply information necessary for either the installation and operation of the digital exciter model AT7001 providing a digital UHF signal of 100mW rms. LINEAR INDUSTRIES recommends that the user carefully reads this section of this manual before installing or operating this equipment. 1.
AT75K0-1 Owner’s Manual -310M inputs 1.3 Composition The equipment includes the following modules: – CIP8231 – CIP8453 - CIM3108 - Module 4572 -Digital Converter - Module 4541 - Module 4573 (versions M110/M220/B220) Master Clock Generator - Module 4578 01 Digital / Analog Converter – CIP8334 – CIP8452 01 Convertor A/D – CIP8425 01 10MHz Internal OCXO – Module 4281 1.
AT75K0-1 Owner’s Manual The control unit can process the information in such a way when installed in a transmitter, that it makes it possible for the user the access readings like forward and reverse power, voltage and current of PSU‟s, transistor currents, current and past alarms; and some set-up and configurations, such as adjustment of power and password, etc, although the majority of these configurations are carried fixed in the factory and do not have to be modified by the user.
AT75K0-1 Owner’s Manual 1.5 AT7001 - Module and parts location Rear panel © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 1.6 AT7001 – 100mW UHF ATSC/8VSB Exciter - Technical Specifications © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 1.7 AT7001 Block Diagram: © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 1.8 The AT7001 from Linear Industries 1.9 Serial Identification © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Section 2B – AT7001 Installation 2.1 Introduction For those sites that require so, this section provides general information on the installation of the AT7001 unit. With proper installation the AT7001 will provide uninterrupted and optimum performance for many years. 2.2 Initial inspection It is important to inspect all the packing and verify no visible damage to the equipment immediately upon receipt.
AT75K0-1 Owner’s Manual 2.4 Input Mains The input mains voltage of the exciter driver is set at the factory; it is not necessary to alter its configuration. This equipment can be fed with a voltage of 90 - 240 VAC at a mains frequency of 41-63 Hz, without interruption or damage to the equipment. The exciter/driver includes a standard three pin AC input. The central pin is ground and is connected to the chassis of the assembly. An external ground lug is also included for additional grounded (recommended).
AT75K0-1 Owner’s Manual 2.6 Lightning protection of the equipment Grounding should be made through a separate and specific cable and terminated correctly at both ends. The ground is labeled GND on the exciter driver unit. As TV transmitter sites are normally located on higher altitude points such as mountains, hills and tall buildings there is a higher incidence probability of static and electrical discharge from lightning.
AT75K0-1 Owner’s Manual protect the transmission equipment and damage caused by static discharge or lightning will not be covered by the equipment guarantee. 2.7 Grounding of the electric Installation Lightning can enter the transmitter building via many routes including the transmission line via the antenna and or tower structure. In such a case, the lightning can discharge enormous amounts of destructive electrical energy on the transmitter and it‟s peripheral equipment.
AT75K0-1 Owner’s Manual 9- Display – Digital LCD screen of 4 lines and 40 columns, through which displays the navigation menus and software management of the transmitter*. (*If installed inside LINEAR manufactured transmitter). © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 2.8.
AT75K0-1 Owner’s Manual 2.8.3 Dimensions © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 2.9 Installing Exciter / Driver into a transmitter For the installation of the exciter driver into a transmitter the following conditions are necessary: 1- Two samples of feedback (before and after the filter). The amplitude/frequency response should have less than 1dB of ripple within +/- 15MHz of the channel of operation. 2- Impedance of the sample ports must be 50 ohms 3- The RF level of the sample before and after the filter must be between -10dBm and 0dBm (average level).
AT75K0-1 Owner’s Manual E- Adjustment of the Pilot Level This adjustment allows for the configuration in the level desired ATSC signal pilot carrier level, with the following band of values: -2048 the +511. For more details on this configuration consult annex A (Operational Software) F- Linearization ON and OFF Non-Linear Pre-Correction – It is possible to confirm and to switch off the non-linear pre-correction from the front panel.
AT75K0-1 Owner’s Manual CLOCK LOCK FAIL FIFO OVERFLOW +15V, +8V, +3.3V, +27V Indicates loss of lock to the modulator clock Indicates a FIFO “first in first out” overflow to the modulator Indicates incorrect voltage from the respective +15V, +8V, +3.3V or 27V supplies. © 2009 Linear Industries, Inc., all rights reserved Examine the functioning of the modulator clock assembly and printed circuit board, located inside up-converter module.
AT75K0-1 Owner’s Manual Section 3A - RF Power Drawer - Module 4634 1. Introduction: The RF power amplification section of this transmitter is built based on one or more RF Power Drawer Modules 4634. The nominal RF output power is 430W (ATSC) at the UHF band. These drawers are commonly termed P1, P2, P3, etc…..The final power of the transmitter determine how many RF drawers will be used.
AT75K0-1 Owner’s Manual 2. Module Placement © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 3. Module 4634 Block Diagram Block Diagram PART 1 – RF © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Block Diagram PART 2 – Controls, Measurements and Power Supply © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 4. Panels 4.1 Front Panel RF Power Drawer 4634 – Front Panel Cold Air Inlet – 1500 ft/minute 4.2 Rear Panel 1 3 5 7 RF IN 50 Ohms N Connector Line Fuse 15A GND RS232 – DB9 Connector – Hyper-terminal Communication 2 4 6 8 RFOUT 50 ohms – DIN 4.196 Connector Supply – AC 208 Volts 10A Fan Fuse RS485 – DB9 Connector for communication between the 4634 Amplifier and the Digital Control Unit RF Power Drawer 4634 - Rear Panel © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 5. Modules Description 5.1 Digital Control Unit – CIM3547 (CIP8448) 5.1.1 General Description about the RF Drawer - Module 4634 - Microcontroller Control Unit. The RF power drawer has a control unit built in the module, reference PC board CIP8448. This digital control unit, CIP8448, keeps complete control over the module 4634 operation. The Digital Exciter LCD display is the visual interface with the operator.
AT75K0-1 Owner’s Manual 5.1.3 Digital Control The integrated circuit CI5 (A128) is a 16 bits microcontroller integrated circuit factory programmed in assembly. Different software‟s and different upgrade versions could be programmed. From the factory, these software and version is labeled on a sticker placed on the circuit board. This circuit is the central part of the module 4634 operational control. Eventually the CIP8448 could be substitute.
AT75K0-1 Owner’s Manual 5.1.6 Serial RS232 Communication The access to the control board CIM3547/CIP8448 at the RF drawer is possible using the Windows hyperterminal, via RS232/DB-9 connector interface. See the RF Drawer operational software manual for more details. 5.1.7 Serial RS485 Communication The control board (CIP8448) built in the RF Power Drawer is subordinated to the Digital Exciter Control Unit (CIP8231). The communication between these controls is performed via a RS485.
AT75K0-1 Owner’s Manual RF Power Drawer 4634 - Module 4582 – Stages 1 and 2 The third stage is build using two BLF871 transistors, also connected 90 degrees apart each other, the gain on this stage is 17dB ± 1.5dB. RF Power Drawer 4634 - Module 4582 – Stages 3 This driver has optimum impedance matching characteristics and few adjustment points. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 5.2.2 Technical Specifications: Parameter Specification INPUT Frequency 470MHz – 810MHz Impedance 50 Ohms Return Loss Max. Level +13dBm Connectors N OUTPUT RF Power Up to 20W rms (ATSC) 2nd Harmonic ≤ -35dBc Impedance 50 Ohms Typical GAIN 38 dB± 1dB GENERAL Energy Source +42V Comsumption 6A © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 5.3 1:4 Isolated Power Splitter - Module 4636 5.3.1 General Description This module is a passive UHF broadband RF splitter. It performs an evenly ¼ signal division out of the incoming RF signal from the driver, up to 20W. The RF output of this module feeds the input of the main pallet amplifiers, in a total of 4 amplifiers, one for each output of the splitter. RF Power Drawer 4634 - Module 4636 – UHF isolated power splitter 5.3.
AT75K0-1 Owner’s Manual 5.3.3 UHF Power Amplifiers – Module 4637 This module is a broadband amplifier designed for the entire UHF band. It deliveries 107W rms on ATSC/8VSB RF Power Drawer 4634 - Module 4637 – UHF pallet amplifier Each RF Power Drawer – 4634 – has 4 of those modules – 4637 - operating in parallel. The total available operational RF power is 430 Watts ATSC/8VSB. The amplifier is a single class AB stage amplifier.
AT75K0-1 Owner’s Manual 5.3.4 Technical Specifications: PARAMETERS SPECS INPUT FREQUENCY 470 to 860MHz IMPEDANCE RETURN LOSS ≥ 10dB CONNECTOR N/T RF OUTPUT GAIN (TYP.) 17 dB± 1dB ATSC RMS POWER HARMONICS 2 nd Up to 107,5Wrms ≤ -30dBc GENERAL CONSUMPTION 13A @ 107,5W (ATSC) 5.4 4:1UHF Broadband Isolated Combiner – Module 4635 The passive Combiner – module 4635 – implements a symmetrical combination of the 4 RF signals from the output of the module 4637, the RF pallet amplifier.
AT75K0-1 Owner’s Manual Block Diagram 50 / 400W 50 / 400W IN 2 50 / 400W IN 3 50 / 400W IN 4 IN 1 OUT 5.4.1 Circuito de proteção de potência refletida (VSWR) e over-driver – Módulo CIP8498 (CIM3615) The RF Power Drawer has 2 circuits dedicated to RF protection. One is set for VSWR, and other is for overdrive protection. The VSWR protection is assembling on the CIP8498. When it is active the protection acts fast reducing the gain on the driver amplifier – module 4582.
AT75K0-1 Owner’s Manual The CIP8498 is located at the module – 4635 the 4:1 combiner. 5.5 Power Supply – Module 4580 The Power Supply – module 4580 is a switching power supply using full bridge topology. The efficiency is higher than 80%. This module also include the PFC (power factor correction) also filtering the harmonics product that could be feedback to the AC line. This power supply is also fully protected against output shortcircuit event, readings on voltage and currents.
AT75K0-1 Owner’s Manual PFC The PFC circuit is located at the PC Board CIP8467, MODULE – 4580. This circuit is composed by a power supply with a boost regulator on continuous conduction mode (CMM). This arrangement guarantees power fact better than 0.9 [cos > 0.9]. Using bridge of diodes, a full wave rectification and a boost inductor the low voltage is elevated up to +375V.
AT75K0-1 Owner’s Manual TRIMPOT TPO4 TPO5 TPO6 TP07 TPO8 TPO9 TPO10 TPO11 TPO12 TPO13 Current I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 Shutdown The shutdown command is initiated by the digital control unity, PC Board CIP8448. When some abnormal condition is present a +5V command is generated. This voltage is routed to the PIN 1 at the CON8 located on the PC Board CIP8448.
AT75K0-1 Owner’s Manual 5.5.1 Technical Specifications: Parameter AC input Specification 180 – 260Vac Swtching frequency PFC – 100KHz Full Bridge ZVT - 25KHz Nominal Output Currents and Voltages OUT 1: + 42Vdc – 10A OUT 2 : + 42Vdc – 10A OUT 3 : + 42Vdc – 10A OUT 4 : + 42Vdc – 10A OUT 5 : + 42Vdc – 10A OUT 6 : + 42Vdc – 10A OUT 7 : + 42Vdc – 10A OUT 8 : + 42Vdc – 10A OUT 9 : + 42Vdc – 2A OUT 10: + 42Vdc – 4A Ripple Fator de Correção de Potência Better than 250mVpp Better than 0,9 5.5.
AT75K0-1 Owner’s Manual Section 3B – RF Power Drawer Operational Software - Model 4634 1- Installation of communication cable with Microsoft HyperTerminal The model 4634 power drawer can be configured by PC and serial terminals emulators, specifically with the Microsoft HyperTerminal correctly installed in a PC with Microsoft Windows XP Professional Service Pack 3 operational system and serial or USB communication ports.
AT75K0-1 Owner’s Manual The communication cable and the test connector must be installed even if the PC used does not have serial interface with the DB-9 male connector. In this case, it is recommended the use of a PC with USB communication interface and USB to Serial RS-232 converter cable, of good quality, to avoid faulty communication with the power drawer during tests.
AT75K0-1 Owner’s Manual Note: The selection of the communication port is always done the same way, for either type of cable used. 4) Define the parameters accordingly to the figure below and then click OK. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 5) After the execution of these steps, the HyperTerminal will be ready to show the power drawer data. It is suggested to access the menu: Archive – Save As ... so this session of the HyperTerminal is saved in the directory; always ready to be used when needed, thus avoiding a reconfiguration of the parameters shown above. The HyperTerminal visual interface must be like the picture below: © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 3- Communication Test and Configuration of the Microsoft HyperTerminal After the correct installation of the serial cable, correct installation of a USB/Serial RS-232 converter cable and the correct configuration of the HyperTerminal, it is expected that the communication will be established correctly.
AT75K0-1 Owner’s Manual © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 4 – Connection with the power drawer - Linear module 4634 With the procedures described before correctly executed, the communication with the power drawer can be started. The drawer can be turned on while the transmitter is already powered or can be turned on separately from the transmitter in a test or maintenance configuration.
AT75K0-1 Owner’s Manual 5- Power Drawer Operation with HyperTerminal With the communication system between the drawer and the computer established, the drawer or the transmitter can then be turned on. In this case, the screen with the main information appears after keying “ENTER”.
AT75K0-1 Owner’s Manual Below is the description of the terminology: M1: output power module 1 M2: output power module 2 M3: output power module 3 M4: output power module 4 M5: exciter power module 5 M6: exciter power module 6 Note: per configuration programmed in the control drawer, the module nomenclature above can change depending on the type of equipment in which the power drawer operates. The same is valid for currents and temperatures.
AT75K0-1 Owner’s Manual Forw. Power: Shows the forward power value in watts generated by the drawer. Refl. Power: Shows the reflected power value in watts generated by the drawer. Voltage: Shows the voltage value in volts generated by the drawer power supply. Software: Shows the name and the version of the system software of the control drawer. This information is made of three parts: module identification, numeric identification of the software and version indication.
AT75K0-1 Owner’s Manual powering off occurs, timer 2[00:00] is started and shut down in 60 seconds. If a third powering off occurs, timer 3[00:00] is started and shut down in 120 seconds. During each of these shut down counts, the power supply remains powered off. The powering off might be caused by reflected power alarms, temperature outside the limits or current outside the limits.
AT75K0-1 Owner’s Manual power drawer with or without counting down the “shutdown” cycles or turning off the power supply. For option S, the current alarms don‟t turn off the power supply, what happens is a process of power reduction coordinated by the control drawer (central control system) of the equipment. However, in the case of overheating or reflected power, the drawer is powered off to cool or to protect against reflected power. Refl.Pwr. Counter: 000000: Persistence counters of the reflected power.
AT75K0-1 Owner’s Manual (2) Shut Down: Shut Down the power supply outputs that maintain the power modules. The general power supply system remains active and so does the control system. In case the power drawer is on normal operation under the central control system, this option is blocked and the attempt of accessing it will generate the following message at the HyperTerminal: SD.Locked!. (3) Power On: Turn on the power supply outputs that maintain the power modules.
AT75K0-1 Owner’s Manual 6. Descriptions of Alarm Messages and Help Screen The access to the Help Screen, is done by executing option (5) Help of the Main Screen described in Item 5. To exit this screen at any time, just use the option (Esc) Previous Screen. In the case when not opting for the voluntary exit of the help screen, an automatic exit to the main screen will be executed per counter , which allows for 30 seconds, as the priority is for alarm monitoring at the main screen.
AT75K0-1 Owner’s Manual NM: This indicator shows the quiescent current adjustment coefficients per temperature calculation screen. If the calculation is started with the drawer outside the transmission rack, it won‟t be possible to identify the number of the drawer and save it at the non-volatile memory. In this situation, the information saved is the indicator NM which means “Power Drawer Number Not Memorized”.
AT75K0-1 Owner’s Manual 7) 42off!: Occurs when the power supply is shut down by the control system due to the occurrence of other alarms. 8) Ref.P!: Occurs when the reflected power surpasses 25% of the value of the nominal forward power of the drawer. 9) 42Lev!: Occurs when the voltage at the power supply has a decline in its nominal value. 10) Fan1!: Indicates a fault in the first bank of fans. It doesn‟t cause the power supply to shut down. 11) Fan2!: Indicates a fault in the second bank of fans.
AT75K0-1 Owner’s Manual procedures, this LED blinks softly approximately every second. After the tests are concluded, if the completion was automatic due to temperature, the LED blinks in 2 intervals in one second, and it is totally off during the next second in this sequence. The E-VGS! Alarm is only deactivated and the LED only goes back to constant “on” state and normal intervals when the drawer is powered off by shutting down the main power.
AT75K0-1 Owner’s Manual Power drawer layout to facilitate diagnostics and module identification. The Table below sows conditions and measurement values for the activation of the alarms and shutting down the power supply: © 2009 Linear Industries, Inc.
GAVETA DE POTÊNCIA LINEAR MODELO 4634 – MEDIDAS NOMINAIS, LIMITES DE ATIVAÇÃO DE ALARMES E DESLIGAMENTO ND = NÃO DEFINIDO AT75K0-1 Owner’s Manual NA = NÃO SE APLICA ATSC ISDB PRIMUS POTENCIA DIRETA NOMINAL (4 volts) 421 202,1 808,4 W SHUTDOWN/CONTAGEM NA POTENCIA REFLETIDA NOMINAL (4 volts) 98,7 50,3 202,4 W SIM CORRENTE I1 NOMINAL (4 volts) PA SAÍDA 8,02 8,02 8,02 A NA CORRENTE I2 NOMINAL (4 volts) PA SAÍDA 8,02 8,02 8,02 A NA CORRENTE I3 NOMINAL (4 volts) PA SAÍDA 8,02 8,02
AT75K0-1 Owner’s Manual Tabela de mensagens de alarmes – Gaveta de potência 4634 Mensagem Descrição Ocorrência Providência config. Combinada Providência config.
AT75K0-1 Owner’s Manual 7. Manual adjustment of quiescent currents with HyperTerminal To access the manual adjustment of currents screen, execute option (4) Drawer Adj. of the main screen. Below is a picture of that screen: The first important consideration is about the alarm status during the use of this screen. All alarms stop being verified and the automatic voltage adjustment system VGS or quiescent currents are disabled.
AT75K0-1 Owner’s Manual without delay, to avoid the possibility of overheating the drawer, because in this screen there aren‟t temperature measurements and the alarms that monitor temperature are disabled. ATTENTION Any test, maintenance and operation procedures in Linear equipment must be performed by authorized personnel that are trained in transmission equipment for TV signals or by personnel trained in Linear equipment. In case of doubt, contact Linear.
AT75K0-1 Owner’s Manual While moving the cursor, the message Changed! in Saving Status, indicates that the initial values were changed and updated in the transistors. It also indicates that these values are not saved and the exiting the screen or tuning off the drawer doesn‟t save these values. When exiting the screen, the last adjustment is maintained but it is not saved and turning off the drawer causes the loss of these values.
AT75K0-1 Owner’s Manual It is important to reinforce that manual adjustment of the quiescent current is only maintained stable during the adjustment process. When returning to the main screen, the automatic VGS voltage adjustment system or quiescent currents starts to readjust the manual values periodically, as long as the adjustment coefficients were calculated. The options (Esc) and (Enter) execute the return to the main screen and the update of the measurements and adjustments made, respectively.
AT75K0-1 Owner’s Manual 8. Alarms and Power Supply Shut Down Diagnostics Logs Linear power drawer‟s control system, has an alarm log system that stores at the non-volatile memory, all the data related to all alarm occurrences that caused the shutdown of the power supply. There is also stored the information about the shut down time cycle counters and the quantity of shut down counters. To access this information, activate option (6) Alarm Logs of the main screen of the HyperTerminal.
AT75K0-1 Owner’s Manual means that each time a shutdown is caused by a different alarm, all the alarms will be shown at the same time in the list. Below is the information saved from the shut down counter that displays how many times the power supply was shut down by the alarms in the list. Following, is the information of which shut down cycles occurred with their numeric values displayed.
AT75K0-1 Owner’s Manual 9.
AT75K0-1 Owner’s Manual Drawer Operation phase Instant (s) Verification of persistent general alarms Description Executes Drawer Phase Start (12 seconds). The 12 second timer restarts the drawer and after this time, if any alarm re-appears, the drawer is shut down. Activates 10 minute timer to verify the re-occurrence of alarms. If no alarm continues, zero the 30, 60 and 120 second and 10 minute counters, maintaining the power supply on.
AT75K0-1 Owner’s Manual Annex A – AT75K0-1 Operational Software 1. Introduction The AT7350 transmitter is part of the ADVANCED TV family having measuring systems, configuration setup, alarms and remote management (TELESUPERVISION); and is managed by micro-controller system. This document shows how to navigate, operate and configure the equipment functions. 2. Navigation and Signalization 6 1 4 5 2 3 2.1 Keyboard 1 the cursor to the position above. 6 4 5 2 3 – Confirms the selection.
AT75K0-1 Owner’s Manual Main Menu: -> Setup Menu Measurements System Alarms/Log [0000] Remote Access Press ENTER. NOTE: All configuration screens have a four digit menu identification number placed on the right side of the screen. 2.3. Operation Indicators The equipment has LED indicators on the front panel that when illuminated indicate: POWER ON – Equipment is powered. SYNC. LOSS – Loss of input signal. CURRENT ALARM – An alarm went off. PAST ALARM – Existence of an old alarm at the “Alarm Log”. 3.
AT75K0-1 Owner’s Manual Main Menu: -> Setup Menu Measurements System Alarms/Log [0000] Remote Access Information referring to the equipment can be accessed through the main menu, this information includes: input power supply voltage, transport stream, measurements of the drawers, etc. Note: To return the initial screen from the “Main Menu”, just press and hold the ESC key.
AT75K0-1 Owner’s Manual COMMUNICATION STATUS EQP. POWER SUPPLY SOFTWARE VERSION COMMUNICATION 15V 8V Battery Digital Exciter Drawer Shows the communication status of the drawers Status of the 15V power supply Status of the 8V power supply Status of the12V battery Software of the digital exciter Software of the power drawer Following, the sequence to obtain the measurements above will be shown. 4.1.
AT75K0-1 Owner’s Manual Use the screen “ ” to access the other screens in this Menu. Transmitter Power Measurements: [2100] Programmed: 0 [W] Forward: 0 [W] Reflected: 0.0 [W] ALC Reference Voltage: 0.00 [V] To return to the previous screen, press ESC.. 4.2. Measurements relative to the input flux (Transport Stream) Shows information regarding the digital signal.
AT75K0-1 Owner’s Manual Select Transport Stream and press ENTER Transport Stream Measurements: -> Transport Stream: Sync. Loss Data Packets Rate: 0.00 Null Packets Rate: 0.00 -> FIFO Occupation(%): [2200] 0.00% To return to the previous screen, press the key ESC . Drawers Measurements Through this menu, you may access the power measurements, current and temperature of each amplifier module of the power drawer.
AT75K0-1 Owner’s Manual Select Power Supply and press ENTER Drawer Power Supply: Drawer: ◄01/14► 42V Power Supply: [2310] 0.0 [V] To select a drawer press the keys or Observe the data shown. Press ESC to return to the menu Drawer Measurements. Drawer Measurements: Power Supply -> Current Temperature [2300] Select Current and press ENTER. Drawer Current Measurements: [2320] Drawer: ◄01/14► ▼More Modules▲ ->Mod.1 I1: 0.00 A Mod.2 I2: 0.00 A Mod.3 I3: 0.00 A Mod.4 I4: 0.
AT75K0-1 Owner’s Manual Select Temperature and press ENTER. Drawer Temperature Measurements: [2330] Drawer: ◄01/14► Exciter: 0.0 ºC ▼ºF▲ Mod.1: 0.0 ºC Mod.2: 0.0ºC Mod.3: 0.0 ºC Mod.4 0.0ºC To select different drawers, press the keys ◄ or ►. To change the temperature reading unit, °C for °F, press the keys ▼ or ▲. 4.4 Medidas das Tensões do Excitador Digital These screens show the voltage status at the digital exciter power supply.
AT75K0-1 Owner’s Manual 4.5 Drawers Communication Status From this screen it is possible to verify the communication status of each power drawer. To check the communication status, press ESC until it returns to the Measurements screen or access Measurements from the Main Menu. Measurements: Power Transport Stream Drawers [2000] Exciter Power Supply -> Communication Status Eqp. Power Supply Software Version Select Communication Status and press ENTER.
AT75K0-1 Owner’s Manual Measurements: Power Transport Stream Drawers [2000] Exciter Power Supply Communication Status -> Eqp. Power Supply Software Version Select Eqp. Power Supply and press ENTER Power Supply Measurements: 15V: OK 8V: OK Battery: 12.5[V] [2600] Press ESC until it returns to the main menu. 4.7 Software Version This screen indicates the name of the software and its version.
AT75K0-1 Owner’s Manual Select Software Version and press ENTER Software Versions: Digital Exciter: AT1035 0.2 Drawer ◄01/14► : GP3000 1.8 FPGA: AL1019 V.1.1 [2700] To select different drawers, press the keys ◄ or ►. Press ESC to return to the Main Menu. 5. Alarm System The equipment has indicator LEDs mounted on the frontal panel, one LED indicates loss of the input signal (SYNC.
AT75K0-1 Owner’s Manual System Alarms/Log: -> Current Alarms Alarm Log Drawers Alarms [3000] Clear Alarm Log Select Current Alarms and press ENTER Current Alarms: [3100] Alarms List Empty! If there is no alarm the message “Alarm List Empty!” will appear. Press the ESC key to return to the menu System Alarms/ Log menu. System Alarms/Log: Current Alarms -> Alarm Log Drawers Alarms [3000] Clear Alarm Log © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual To check all the existing alarms, in other words, alarms that are occurring now and alarms that no longer are occurring, select Alarm Log and press ENTER. Alarm Log: [3200] -> ! 25/03/08 10:55:29 Log Cleared ! 28/03/08 20:19:05 LO Lock Fail # 28/03/08 20:22:43 LO Lock Fail The symbol “I” before the log indicates that the time the alarm occurred is registered. The symbol “#” before the log indicates that the time the alarm stopped occurring is registered.
AT75K0-1 Owner’s Manual Select System Alarms/Log and press ENTER System Alarms/Log: Current Alarms Alarm Log -> Drawers Alarms [3000] Clear Alarm Log Select Drawers Alarms and press ENTER. Drawers Alarms: [3300] -> Current Alarms Past Alarms (Hold Enter to Clear) Select Current Alarms and press ENTER to check for current alarms. Drawer ◄01/14► Current Alarms: [3310] Alarm List Empty! Use the keys or to select the drawer. Press the key ESC to return to the screen Drawers Alarms.
AT75K0-1 Owner’s Manual 6. System Setup Allows access to configuration parameters of the equipment.
AT75K0-1 Owner’s Manual 6.1 Programming the transmission power level Commands the software to set the transmission power of the equipment. To access the programming screen of the transmission power, the following sequences of screens must be followed, starting from the main menu.
AT75K0-1 Owner’s Manual Power Setup: [1100] Output: 0 [W] Program: 0 [W] Remote Control Active. To select the desired power, the key must be used to increase the power or the key to decrease it. In case you desire to increase or decrease the power rapidly, just press and hold the or key until you reach the desired value. After the power is selected, press ENTER. IMPORTANT: THIS PROGRAMING DOES NOT CHANGE THE TRANSMISSOR OUTPUT POWER.
AT75K0-1 Owner’s Manual Select Transmitter Setup and press ENTER. Transmitter Setup: -> Automatic Level Control: On Mute on TS Loss: On Power Control: Local [1200] To configure the options as shown on the screen [1200] above, use the keys ◄ or ►. Press ESC to return to Setup Menu.
AT75K0-1 Owner’s Manual ATTENTION: When accessing this screen, by selecting option “YES”, the operator will be responsible for the changes done on this parameter, as well as the effects that these changes may cause in the equipment if not using the appropriate instruments and test point. To access the screen Image Frequency Suppression, select YES using the keys ◄ or ►. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 6.3 Image Frequency Suppression Allows the configuration of numeric values related to the amplitude and phase of the signal for the suppression of the image frequency (superior lateral band). Both amplitude adjustments are set in [dB] and both phase adjustments are set in [degrees]. Image Frequency -> I Amplitude: Q Amplitude: I Phase : Q Phase Suppression: -0.000 [dB] -0.000 [dB] + 0.00º [1300] : + 0.00º Press ESC until it returns to the Setup Menu.
AT75K0-1 Owner’s Manual The screen below will appear. WARNING!! Changing these parameters may damage the equipment. Use appropriate instruments to do it. Continue? ◄ No ► ATTENTION: When accessing this screen, by selecting option “YES”, the operator will be responsible for the changes done on this parameter, as well as the effects that these changes may cause in the equipment if not using the appropriate instruments and test point.
AT75K0-1 Owner’s Manual 6.5 Activate/De-activate Pre-Correction Through these screens it is possible to activate or de-activate the linear and non-linear pre-correction. ON: activate the pre-correction OFF: de-activate the pre-correction To access this screen, press ESC until reaching the SETUP MENU screen.
AT75K0-1 Owner’s Manual Access Pre-Correction and press ENTER The screen below will appear: WARNING!! Changing these parameters may damage the equipment. Use appropriate instruments to do it. Continue? ◄ No ► ATTENTION: When accessing this screen, by selecting option “YES”, the operator will be responsible for the changes done on this parameter, as well as the effects that these changes may cause in the equipment if not using the appropriate instruments and test point.
AT75K0-1 Owner’s Manual Linear Pre-Correction: Linear Pre-Correction: On [1510] Use the keys ◄ or ► to enable or disable the Linear pre-correction. Press key ESC to return to the Pre-Correction Setup screen.
AT75K0-1 Owner’s Manual Setup Menu: Power Setup Transmitter Setup Image Frequency Suppression [1000] LO Leakage Suppression Pre-Correction -> Modulation Settings Time and Date Setup Password Setup Select Modulation Settings and press ENTER. The screen below will appear: WARNING!! Changing these parameters may damage the equipment. Use appropriate instruments to do it.
AT75K0-1 Owner’s Manual 6. Configuring Date and Time To access the programming screen for date and time, the operator must press ESC until it returns to the SETUP Menu. Setup Menu: Power Setup Transmitter Setup Image Frequency Suppression [1000] LO Leakage Suppression Pre-Correction Modulation Settings -> Time and Date Setup Password Setup Select Time and Date Setup and press ENTER Time and Date Setup: Time: 00:00 [1700] Date: 00/00/00 DD/MM/YY 6.
AT75K0-1 Owner’s Manual Setup Menu: Power Setup Transmitter Setup Image Frequency Suppression [1000] LO Leakage Suppression Pre-Correction Modulation Settings Time and Date Setup -> Password Setup Access Password Setup Password Setup: -> Enable / Choose new password Disable password [1800] To enable a password or to enter a new one, select Enable / Choose new password. New Password: [1810] 0 0 0 0 Write New Password The option Disable password if selected dispenses the use of password. 7.
AT75K0-1 Owner’s Manual Local or remote PC via Ethernet or GPRS (optional). It is possible to change and/or monitor all of the parameters and measurements as is done at the frontal panel through the WEB server. To accomplish this it is necessary to configure the IP / Mask / Gateway. 7.
AT75K0-1 Owner’s Manual 7.2 Mask Configuration To access this screen, press ESC until the Remote Access screen reached. Remote Access: IP Address -> Subnetwork Mask Gateway [4000] Select Subnetwork Mask and press ENTER Subnetwork Mask: [4200] 255.255.255.000 or and 7.3 Gateway Configuration To access this screen, press ESC until the Remote Access screen reached. Remote Access: IP Address Subnetwork Mask -> Gateway [4000] Access Gateway and press ENTER Gateway: [4300] 192.168.100.
AT75K0-1 Owner’s Manual Annex B - GUI7001 software (Rev. E October 2009) Revision History REV DESCRIPTION DATE BY A Initial Version 2008/10/08 Henry Douglas B Updated to new non-linear correction algorithm 2009/02/02 Henry Douglas C Crest Factor Reduction, Type A and Type B Models 2009/07/27 Henry Douglas D New layout, CCDF description correction 2009/09/09 Henry Douglas E Connection message changed 2009/10/19 Henry Douglas How to Contact Linear LINEAR INDUSTRIES INC.
AT75K0-1 Owner’s Manual 1. Introduction GUI7001 is the software developed by Linear Industries Inc. used to perform non-linear and linear pre-correction as long as signal measurements with the AT7001 ATSC 8VSB digital exciter. 2. Installation System Requirements for Windows: Table 1 – Minimum System Requirements.
AT75K0-1 Owner’s Manual ✔ Windows Vista ✔ Windows Vista x64 ✔ Windows XP ✔ Windows XP x64 ✔ Windows 2000 ✔ Windows Server 2003 ✔ Windows Server 2003 x64 Figure 1 – MATLAB Component Runtime Installation Window. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 3. Operation Before running the software. Make sure the AT7001 is on and USB cable is connected between the exciter and PC. The exciter USB Port is located at the rear panel. Run the executable file GUI7001vXXX.exe located in the GUI7001 folder, where XXX indicates the version. The main screen will appear as follows. Figure 2 – GUI Software Main Window. Choose the correct Serial Port number and Click on Connect.
AT75K0-1 Owner’s Manual Figure 3 – Prompt Window. If an option is included, the corresponding button is enabled. Figure 4 – AT7001 connected with all options enabled. 3.1 Non-Linear Pre-Correction This is the process is used to compensate for the power amplifier non-linearity, in order to reduce the intermodulation at the output signal and thus improve PA efficiency.
AT75K0-1 Owner’s Manual operated at higher power. This means that a lower-power lower-cost linearized PA can be used in place of a higher-power higher-cost PA. Furthermore, the linearized PA operates more efficiently since it is operated closer to saturation. The benefits are compounded because a lower-power PA operating more efficiently consumes substantially less power than an inefficient higher-power PA.
AT75K0-1 Owner’s Manual 4. Run – Single iteration algorithm to compensate for non-linear distortions. 5. Memory Effects Compensation – Check this box to compensate for memory non-linear distortions. Uncheck to compesante for memoryless distortions only. 6. Save – Push this button to save the result on the non-volatile memory. 7. Back – Close current window. 8. AM/AM – Figure that shows the AM/AM behavior for the pre-correction. 9. AM/PM – Figure that shows the AM/PM behavior for the pre-correction. 10.
AT75K0-1 Owner’s Manual 4. Press Reset to bypass the last correction. 5. Check or uncheck the Memory Effects Compensation checkbox. 6. If Memory Effects Compensation is checked, select between Type A or Type B at the DUT menu. This option is not available if the memoryless pre-correction is selected (Memory Effects Compensation unchecked). There differences between IOT and Solid State amplifiers regarding its memory nonlinearity’s.
AT75K0-1 Owner’s Manual The next Figure shows typical results using the Memoryless and the Memory Pre-Correction. Usually the Memory correction achieves better results than the Mermoryless correction. Figure 6 – Memoryless vs. Memory Comparison. There is no guarantee to achieve better results using the Memory Pre-Correction. It depends on the amplifier to be linearized. Figure 7 presents the corresponding curves used to compensate for the non-linearity‟s of Figure 6.
AT75K0-1 Owner’s Manual Figure 7a – Memoryless curves. Figure 7b – Memory curves. The memory curves (Figure 7b) are three dimensional plots, where the color means amplitude (in [dB]) for AM/AM and phase (in [°]) for AM/PM. A distortion is present when horizontal parallel lines present different colors. When Crest Factor Reduction is used, intermodulation may be reduced.
AT75K0-1 Owner’s Manual Figure 8 – Crest Factor Reduction. 3.2 Linear Pre-Correction This is the process is used to compensate for linear distortions, for example not constant frequency response and group delay inside the channel. A Mask Filter is used at a transmitter output to limit the signal bandwidth and comply with an emission mask. The sharper it is the greater the group delay distortion. A small amount of attenuation is also introduced at channel edges.
AT75K0-1 Owner’s Manual 1 2 6 3 4 7 5 Figure 9 – Linear Pre-Correction Window. 1. Reset – Download an all-pass filter. Used to bypass the linear correction. 2. Enable Linear Pre-Correction – Used to bypass the linear correction or not without downloading an all-pass filter. 3. Run – Single iteration algorithm to compensate for linear distortions. 4. Save – Button used to save the result on the non-volatile memory. 5. Back – Close current window. 6.
AT75K0-1 Owner’s Manual 2. Set the nominal power. 3. If an amplifier is used, run the non-linear pre-correction first, and then the linear precorrection. This will make linear calculation more accurate. 4. Make sure the After Filter Feedback Sample is connected the AT7001 rear panel before running the pre-correction. The coupler used for the sample must be directional, with an isolation greater than 15 [dB] in order avoid miscalculation created by a reflected signal.
AT75K0-1 Owner’s Manual 3.3 Signal Measurements This software is used to perform measurements at the signals generated by the AT7001 Digital Exciter. There are fourteen measurements avaiable. 6 5 1 2 3 4 7 Figure 11 – Signal Measurements Window. 1. Signal Selection – Select which signal is going to be measured. “Input” is the signal at the DUT input, or the modulator output. The Input signal is always the reference. Both feedback samples are also available.
AT75K0-1 Owner’s Manual 5. Measurement Window – This Figure shows the last active measurement. 6. File => Export – Use this option to export the measurement to one of the following formats: – .emf => Enhanced Metafile. – .eps => Encapsulated Postscript. – .jpeg => Joining Photograph Experts Group. – .pdf => Portable Document Format. 7. Information Bar – This bar shows additional information regarding the last measurement.
AT75K0-1 Owner’s Manual AM/AM – AM/AM stands for Amplitude Modulation / Amplitude Modulation, it represents the normalized output/input amplitude ratio (amplifier gain) in [dB] vs. normalized input amplitude in [dB] Full Scale. The blue points show the Instantaneous Transfer Function, as it has a dynamic behavior. Their spread characteristic is caused by noise and memory effects. The red line is the Memoryless Transfer Function that best fits the blue points.
AT75K0-1 Owner’s Manual AM/PM – AM/PM stands for Amplitude Modulation / Phase Modulation, it represents the phase deviation in [°] vs. normalized input amplitude in [dB] Full Scale. The blue points show the Instantaneous Transfer Function, as it has a dynamic behavior. Their spread characteristic is caused by noise and memory effects. The red line is the Memoryless Transfer Function that best fits the blue points.
AT75K0-1 Owner’s Manual CCDF – CCDF stands for Complementary Cumulative Distribution Function. It represents the probability (vertical axis) of the Instantaneous Power be “x” [dB] above the average power, where “x” is the value in the horizontal axis. For example, suppose an amplifier is driving 1 [kW] into a dummy load, and the Feedback Sample was taken from its output. In the measurement below (Figure 15), the 0 [dB] point has a probability around 40 [%].
AT75K0-1 Owner’s Manual Constellation – the constellation is a diagram of the sampled baseband modulating symbols, where the Cartesian plan is plotted by its real vs. imaginary part. The real part (In Phase) of those sampled symbols carry the transmitted information while the imaginary part (Quadrature) carry the necessary information to generate the vestigial side band. For 8VSB modulation, the eight regions represent the eight possible symbols, and the seven dashed lines indicate the decision threshold.
AT75K0-1 Owner’s Manual Constellation Contour – the constellation is a diagram of the sampled baseband modulating symbols, where the Cartesian plan is plotted by its real vs. imaginary part. The real part (In Phase) of those sampled symbols carry the transmitted information while the imaginary part (Quadrature) carry the necessary information to generate the vestigial side band.
AT75K0-1 Owner’s Manual Eye Diagram – The Eye Diagram is the purely real modulating symbols filtered with a raised cosine filter and persisted with a symbol period multiple. The open eyes points indicate the exact moment for the receiver to sample and decide in order to extract the message. Eyes wide open are desired. This measurement reflects the signal quality. Use it to realize non-linear, linear and amplitude distortions.
AT75K0-1 Owner’s Manual Frequency Response – This measurement will show the Frequency Response existent on your device under test, typically a filter. Use it to measure linear distortions. The information bar will show the additional information: Peak to peak frequency response distortion: self explained. Figure 19 – Frequency Response Measurement. Crest Factor Reduction will be automatically bypassed when this measurement is being performed. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Group Delay – This measurement will show the Group Delay existent on your device under test, typically a filter. Use it to measure linear distortions. The information bar will show the additional information: Peak to peak group delay distortion: self explained. Figure 20 – Group Delay Measurement. Crest Factor Reduction will be automatically bypassed when this measurement is being performed. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Power Spectrum Density – This is a spectral analysis using the Power Spectrum Density estimation of the IF signals. The in-band signal average power is normalized to be the 0 [dB] point. The information bar will show the additional information: Shoulders attenuation @ -+ 3.25 [MHz]: shows the shoulder attenuation @ -+ 3.25 [MHz] from channel center frequency relative to the in-band average power with a 500 [kHz] equivalent resolution bandwidth.
AT75K0-1 Owner’s Manual Symbols – This measurement represents the purely real demodulated symbols over time. Figure 22 shows the demodulated symbols after a mask filter without linear pre-corrections and then with. Straight indicates a high MER signal. The information bar will show the additional information: MER: Modulation Error Rate. It is the mean squared error in [dB] considering the perfect symbol as the reference signal. Figure 22 – Symbols Measurement. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Spectrogram – This is a three dimensional measurement representing the Power Density (Z axis) vs. Frequency (X axis) vs. Time (Y axis). The viewing angle can be rotate to any position. Figure 23 – Spectrogram Measurement. Spectrogram Contour – That's the Spectrogram in the X (Frequency) – Y (Time) view, where the color gives the Power Density. Figure 24 – Spectrogram Contour Measurement. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Time Domain – This measurement shows both input and feedback IF signals at the same time in time domain. The information bar will show two additional pieces of information: Error: Shows the Mean Squared Error between the Input and Feedback signals. Figure 25 – Time Domain Measurement. 3.4 Calibration Every AT7001 unit presents a internal linear distortion on feedback path. This distortion is compensated during linear pre-correction. However is not present at the mask filter.
AT75K0-1 Owner’s Manual Figure 26 – Internal feedback linear distortion. 5. At the main screen, click on Advanced and the on Calibration. The Calibration window will open. 6. Press Run to calculate the distortion. The inverse response will appear compared to the last Frequency Response measurement. Next Figure shows the results. Figure 27 – Calibration window. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual 7. Press Save on the Non-Volatile Memory Panel. Close the Calibration window. 8. Back to the measurement window measure the frequency response again. Now with the compensation taking place a flat response will appear. The calibration will take effect on Linear-Precorrection and on measurements like Frequency Response, Group Delay, MER, Constellation, etc. © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual Annex C - Digital Exciter Connections 3.1 Exciter Connections (Control I/O) Connector 1 Connector 2 Connector 2 Connector 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 Equipamento AT75K0 Equipment AT75K0 toMONITORADO be monitored © 2009 Linear Industries, Inc.
AT75K0-1 Owner’s Manual CONTROL I/O connector Digital Exciter PIN COLOR FUNCTION STATUS 1 NOT USED NOT USED NOT USED 2 RED ADDRESS 3 ORANGE DUAL EXCITER DIGITAL OUTPUT 4 BROWN ALARM AC PHASE OUT 5V => OK 0V => Alarm 5 BLUE/WHITE FAN ALARM 4V => OK 0V => Alarm 6 WHITE DATA OUT REMOTE CONTROL ------------ 7 YELLOW ALARM VIDEO A (TS) ------------ 8 RED CLOCK REMOTE CONTROL ------------ 9 NOT USED NOT USED 10 GREEN/RED RRELAY COMMAND 11 GREEN +8V EQUIPMENT INPUT 12 G
